Petrology of the Duke Island ultramafic complex, southeastern Alaska:
Gespeichert in:
| 1. Verfasser: | |
|---|---|
| Format: | Buch |
| Sprache: | English |
| Veröffentlicht: |
Boulder, Colo.
Geological Soc. of America
1974
|
| Schriftenreihe: | Geological Society of America: Memoir
138 |
| Schlagworte: | |
| Online-Zugang: | Inhaltsverzeichnis |
| Beschreibung: | X, 240 S. Ill., graph. Darst., Kt. 6 Beil. |
| ISBN: | 081371138X |
Internformat
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| 100 | 1 | |a Irvine, T. N. |e Verfasser |4 aut | |
| 245 | 1 | 0 | |a Petrology of the Duke Island ultramafic complex, southeastern Alaska |c T. N. Irvine |
| 264 | 1 | |a Boulder, Colo. |b Geological Soc. of America |c 1974 | |
| 300 | |a X, 240 S. |b Ill., graph. Darst., Kt. |e 6 Beil. | ||
| 336 | |b txt |2 rdacontent | ||
| 337 | |b n |2 rdamedia | ||
| 338 | |b nc |2 rdacarrier | ||
| 490 | 1 | |a Geological Society of America: Memoir |v 138 | |
| 650 | 4 | |a Intrusions (Geology) |z Alaska |z Duke Island | |
| 650 | 4 | |a Rocks, Ultrabasic |z Alaska |z Duke Island | |
| 830 | 0 | |a Geological Society of America: Memoir |v 138 |w (DE-604)BV035915045 |9 138 | |
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Datensatz im Suchindex
| _version_ | 1804128065556578304 |
|---|---|
| adam_text | Titel: Petrology of the Duke Island ultramafic complex, Southeastern Alaska
Autor: Irvine, Thomas N
Jahr: 1974
Contents
Frontispiece
Abstract........................................................................................................................................................................................................................
Chapter I. Introduction................................................................................................................................................................................5
A. Geography and field data of Duke Island................................................................................................................7
B. Related investigations and publications......................................................................................................................7
C. Acknowledgments............................................................................................................................................................................8
Chapter II. General geology of the Duke Island area......................................................................................................11
A. Metavolcanic and metasedimentary rocks..............................................................................................................11
B. Gabbroic rocks and derived amphibolites................................................................................................................12
C. Ultramafic rocks................................................................................................................................................................................12
D. Hornblende-anorthite pegmatite..........................................................................................................................................16
E. Granitic rocks........................................................................................................................................................................................16
Chapter III. Petrology of gabbroic rocks........................................................................................................................................19
A. Classification..............................................................................................................................................................................19
B. Olivine gabbro........................................................................................................................................................................................19
1. Distribution and field characteristics......................................................................................................................19
2. Microscopic characteristics of common olivine gabbro........................................................................20
3. Microscopic characteristics of spotted olivine gabbro..........................................................................22
C. Norite and olivine ferronorite................................................................................................................................................23
1. Distribution and field characteristics......................................................................................................................23
2. Microscopic characteristics of norite......................................................................................................................23
3. Microscopic characteristics of olivine ferronorite......................................................................................24
D. Hypersthene gabbro........................................................................................................................................................................24
1. Distribution and field characteristics......................................................................................................................24
2. Microscopic characteristics..............................................................................................................................................24
E. Picrite..............................................................................................................................................................................................................25
F. Paragenesis of hornblende and metamorphism......................................................................................................25
G. Mineral variations..............................................................................................................................................................................26
H. Origin of rock variations..............................................................................................................................................................27
Chapter IV. Petrography of ultramafic rocks............................................................................................................................31
A. Classification and nomenclature..........................................................................................................................................31
B. Areal extent and modal characteristics........................................................................................................................32
C. Dunite............................................................................................................................................................................................................33
1. Distribution and field characteristics......................................................................................................................33
2. Microscopic characteristics..............................................................................................................................................35
D. Peridotite....................................................................................................................................................................................................36
1. Distribution and field characteristics......................................................................................................................36
2. Microscopic characteristics..............................................................................................................................................37
E. Olivine clinopyroxenite and hornblende-olivine clinopyroxenite......................................................39
1. Distribution and field characteristics......................................................................................................................39
2. Microscopic characteristics..............................................................................................................................................40
F. Replacement, recrystallization, late-stage veins, and pegmatitic segregations in oli-
vine-bearing ultramafic rocks..................................................................................................................................................42
1. Replacement dunite and peridotite............................................................................................................................42
2. Recrystallization in olivine clinopyroxenite and peridotite..............................................................44
3. Late-stage veins and pegmatitic segregations of clinopyroxene and olivine....................44
G. Hornblende-magnetite clinopyroxenite and hornblende clinopyroxenite..................................45
1. Distribution and field characteristics......................................................................................................................45
2. Microscopic characteristics..............................................................................................................................................46
H. Hornblendite and hornblende pegmatite......................................................................................................................48
1. Distribution and field characteristics......................................................................................................................48
2. Microscopic characteristics..............................................................................................................................................49
I. Penetrative deformation..............................................................................................................................................................49
J. Summary......................................................................................................................................................................................................51
Chapter V. Hornblende-anorthite pegmatite, amphibolite adjoining the ultramafic complexes,
and hornblende eucrite..............................................................................................................................................................................53
A. Hornblende-anorthite pegmatite..........................................................................................................................................53
1. Distribution and field characteristics......................................................................................................................53
2. Microscopic characteristics..............................................................................................................................................55
3. Derivation..........................................................................................................................................................................................56
B. Amphibolite adjoining the ultramafic complexes................................................................................................56
1. Distribution and field characteristics......................................................................................................................56
2. Microscopic characteristics..............................................................................................................................................57
3. Discussion........................................................................................................................................................................................58
C. Hornblende eucrite..........................................................................................................................................................................59
1. Description......................................................................................................................................................................................59
2. Discussion........................................................................................................................................................................................60
Chapter VI. Layering in the ultramafic rocks............................................................................................................................61
A. Occurrence and distribution....................................................................................................................................................61
B. Classification and nomenclature..........................................................................................................................................61
C. Rhythmic layering..............................................................................................................................................................................63
1. Graded layers................................................................................................................................................................................63
2. Ungraded layers and laminae..........................................................................................................................................64
3. Fragmental layers......................................................................................................................................................................64
4. Lateral extent of the layers................................................................................................................................................65
5. Layer sequences..........................................................................................................................................................................65
6. Orientation of cumulus minerals and rock fragments..............................................................................65
7. Size-sorting characteristics..............................................................................................................................................66
8. Depositional structures........................................................................................................................................................66
9. Features due to bottom crystallization..................................................................................................................69
D. Inch-scale layering...................................................................................... 70
Chapter VII. Geology of the Hall Cove ultramafic complex............................................. 73
A. Hornblende-rich rocks................................................................................. 73
B. Olivine clinopyroxenite zone......................................................................... 74
C. Younger intrusion....................................................................................... 75
1. General features and contact relations......................................................... 75
2. Stratigraphie and lateral variations.............................................................. 76
3. Olivine clinopyroxenite blocks and fragments............................................... 77
4. Peridotite dikes............................................................................................................................................................................78
5. Quartz inclusions........................................................................................................................................................................80
6. Southern boundary of the younger intrusion....................................................................................................82
D. Faults and joints..................................................................................................................................................................................83
Chapter VIII. Geology of the Judd Harbor ultramafic complex..............................................................................85
A. General features and contact relations..........................................................................................................................85
B. Olivine clinopyroxenite zone..................................................................................................................................................85
C. Dunite-peridotite zone....................................................................................................................................................................86
D. Hornblende-rich ultramafic rocks and hornblende-anorthite pegmatite......................................87
E. Faults and joints..................................................................................................................................................................................88
Chapter IX. Notes on other occurrences of ultramafic rocks in the Duke Island area..........................91
A. North Hill ultramafic rocks......................................................................................................................................................91
B. Bodies in the northwest part of Duke Island............................................................................................................91
C. Ultramafic rocks on Dog Island..........................................................................................................................................92
D. Grave Point spinel peridotite1..................................................................................................................................................92
E. Cat Island clinopyroxenite........................................................................................................................................................93
F. Ultramafic bodies in the east part of Duke Island..............................................................................................93
G. East Island and the peninsula east of Judd Harbor............................................................................................94
Chapter X. Structural relations of the main ultramafic complexes........................................................................95
A. Drill-hole data........................................................................................................................................................................................95
B. Aeromagnetic data............................................................................................................................................................................96
C. Geological inferences and synthesis................................................................................................................................98
Chapter XI. Mineralogy and chemistry of the ultramafic rock series..................................................................101
A. Mineralogy................................................................................................................................................................................................102
1. Olivine..................................................................................................................................................................................................102
2. Clinopyroxene..............................................................................................................................................................................103
3. Clinopyroxene from a reaction rim on a quartz inclusion....................................................................105
4. Hornblende and plagioclase............................................................................................................................................109
5. Oxide minerals..............................................................................................................................................................................112
6. Trace elements in the minerals......................................................................................................................................115
B. Rock chemistry....................................................................................................................................................................................120
1. Major constituents....................................................................................................................................................................120
2. Trace elements..............................................................................................................................................................................126
C. Some inferences concerning the physical-chemical nature of the ultramafic
complexes..................................................................................................................................................................................................126
1. Silica activity..................................................................................................................................................................................126
2. Iron-oxygen relations..............................................................................................................................................................128
3. Temperatures and pressures of formation and equilibration............................................................131
Chapter XII. Origin of the ultramafic rock series and composition of the parent magma................133
A. Differentiation of the main rock units............................................................................................................................133
1. Crystallization models..........................................................................................................................................................133
2. Supporting evidence and problems............................................................................................................................137
3. Origin of the narrow hornblende-rich border zone....................................................................................140
B. Petrogenetic relation of the ultramafic and gabbroic rocks..................................................................140
C. Composition of the parent magma of the ultramafic rocks........................................................................141
1. Some general inferences......................................................................................................................................................141
2. Possible volcanic representative..................................................................................................................................143
Chapter XIII. Mechanisms in the formation of ultramafic rocks............................................................................145
A. Theoretical considerations........................................................................................................................................................145
1. Crystallization in convecting magma......................................................................................................................145
2. Heat removal from layered intrusions and quantitative estimates of their
solidification and cooling rates......................................................................................................................................147
3. Settling velocities of the cumulus materials......................................................................................................150
B. Origin of layering................................................................................................................................................................................152
1. A basic model................................................................................................................................................................................152
2. Deposition of rhythmic layering..................................................................................................................................155
3. Formation of inch-scale layering................................................................................................................................156
C. Origin of the olivine clinopyroxene cumulates of peridotite composition..................................157
D. Formation of the replacement dunite, peridotite, and associated recrystallized
rocks........................................................................................................................................................................................................158
Chapter XIV. Summary history of the origin of ultramafic rocks..........................................................................161
A. Some general concepts..................................................................................................................................................................161
B. Evolution of the Duke Island ultramafic complex..............................................................................................162
Chapter XV. General observations and comments on the Alaskan-type ultramafic complexes... 165
A. Nomenclature........................................................................................................................................................................................165
B. Cumulates, crystallization differentiation, and replacement processes........................................166
C. Origin of zoning....................................................................................................................................................................................167
D. Volcanic affinities, parent and derivative magmas............................................................................................170
Plate section............................................................................................................................................................................................................177
References cited..................................................................................................................................................................................................229
Index..............................................................................................................................................................................................................................237
|
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| indexdate | 2024-07-09T18:43:19Z |
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| isbn | 081371138X |
| language | English |
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| physical | X, 240 S. Ill., graph. Darst., Kt. 6 Beil. |
| publishDate | 1974 |
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| series | Geological Society of America: Memoir |
| series2 | Geological Society of America: Memoir |
| spelling | Irvine, T. N. Verfasser aut Petrology of the Duke Island ultramafic complex, southeastern Alaska T. N. Irvine Boulder, Colo. Geological Soc. of America 1974 X, 240 S. Ill., graph. Darst., Kt. 6 Beil. txt rdacontent n rdamedia nc rdacarrier Geological Society of America: Memoir 138 Intrusions (Geology) Alaska Duke Island Rocks, Ultrabasic Alaska Duke Island Geological Society of America: Memoir 138 (DE-604)BV035915045 138 HBZ Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=009065412&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Irvine, T. N. Petrology of the Duke Island ultramafic complex, southeastern Alaska Geological Society of America: Memoir Intrusions (Geology) Alaska Duke Island Rocks, Ultrabasic Alaska Duke Island |
| title | Petrology of the Duke Island ultramafic complex, southeastern Alaska |
| title_auth | Petrology of the Duke Island ultramafic complex, southeastern Alaska |
| title_exact_search | Petrology of the Duke Island ultramafic complex, southeastern Alaska |
| title_full | Petrology of the Duke Island ultramafic complex, southeastern Alaska T. N. Irvine |
| title_fullStr | Petrology of the Duke Island ultramafic complex, southeastern Alaska T. N. Irvine |
| title_full_unstemmed | Petrology of the Duke Island ultramafic complex, southeastern Alaska T. N. Irvine |
| title_short | Petrology of the Duke Island ultramafic complex, southeastern Alaska |
| title_sort | petrology of the duke island ultramafic complex southeastern alaska |
| topic | Intrusions (Geology) Alaska Duke Island Rocks, Ultrabasic Alaska Duke Island |
| topic_facet | Intrusions (Geology) Alaska Duke Island Rocks, Ultrabasic Alaska Duke Island |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=009065412&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
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