The Kiglapait layered intrusion, Labrador:
Gespeichert in:
| 1. Verfasser: | |
|---|---|
| Format: | Abschlussarbeit Buch |
| Sprache: | German |
| Veröffentlicht: |
[Boulder, Colo.]
1969
|
| Schriftenreihe: | Geological Society of America: Memoir
112 |
| Schlagworte: | |
| Online-Zugang: | Inhaltsverzeichnis |
| Beschreibung: | 204 S. Ill., graph. Darst., Kt. 2 Kt. |
| ISBN: | 0813711126 |
Internformat
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| 245 | 1 | 0 | |a The Kiglapait layered intrusion, Labrador |c S. A. Morse |
| 246 | 1 | 3 | |a Geology of the Kiglapait layered intrusion, coast of Labrador, Canada |
| 264 | 1 | |a [Boulder, Colo.] |c 1969 | |
| 300 | |a 204 S. |b Ill., graph. Darst., Kt. |e 2 Kt. | ||
| 336 | |b txt |2 rdacontent | ||
| 337 | |b n |2 rdamedia | ||
| 338 | |b nc |2 rdacarrier | ||
| 490 | 1 | |a Geological Society of America: Memoir |v 112 | |
| 502 | |a Zugl.: Montreal, CA, McGill Univ., Diss., 1961/62 u.d.T.: Morse, Stearns A.: Geology of the Kiglapait layered intrusion, coast of Labrador, Canada | ||
| 650 | 7 | |a Intrusão |2 larpcal | |
| 650 | 4 | |a Intrusions (Geology) |z Newfoundland and Labrador | |
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Datensatz im Suchindex
| _version_ | 1804127422769004544 |
|---|---|
| adam_text | Titel: The Kiglapait layered intrusion, Labrador
Autor: Morse, Stearns A
Jahr: 1969
Contents
Page
Abstract ................................................................................................................................1
Introduction and geologic setting........................................................................................3
Introduction ......................................................................................................................5
General statement........................................................................................................5
Plan of paper................................................................................................................6
Previous work ..............................................................................................................6
History of current investigation..................................................................................7
Work in progress..........................................................................................................7
Place names..................................................................................................................8
Geologic setting................................................................................................................9
Location and name......................................................................................................9
Geologic column..........................................................................................................9
Older country rocks....................................................................................................9
Gneisses and migmatites; peridotite ......................................................................9
Snyder group............................................................................................................13
Contact and basal conglomerate ........................................................................13
Gray breccia ........................................................................................................14
Spotted quartzite ..................................................................................................15
Aluminous gneisses..............................................................................................15
Metamorphism......................................................................................................15
Age ........................................................................................................................15
Anorthosite ..............................................................................................................15
Classification ........................................................................................................16
Composition ........................................................................................................17
Younger intrusive rocks..............................................................................................17
Intermediate rocks ..................................................................................................17
Age........................................................................................................................18
Origin ....................................................................................................................19
Alaskite ....................................................................................................................19
Topaz Point rocks....................................................................................................20
Manvers granite ......................................................................................................21
Field relations ......................................................................................................21
Mineralogy ..........................................................................................................21
Petrography; discussion ......................................................................................22
Age........................................................................................................................23
Basic dikes................................................................................................................24
Older metadiabase ..............................................................................................24
Younger dolerite and diabase ............................................................................24
The Kiglapait Intrusion ......................................................................................................27
Field relations ..................................................................................................................29
Introduction ..................................................................................................................29
Form and general interpretation................................................................................29
The floor ......................................................................................................................32
External contacts and xenoliths......................................... 32
North and west edges............................................... 32
Southwest extent of Border Zone ..................................... 33
Contact against anorthosite.......................................... 34
Hare Point........................................................ 34
Eastern contact.................................................... 36
Loafhead Island ................................................. 36
Mainland ....................................................... 36
Topaz Point..................................................... 37
Discussion ...................................................... 37
Chill ............................................................. 39
Discussion ........................................................ 39
The Roof........................................................... 40
Central area and Upper Border Zone.................................. 40
Discussion ...................................................... 41
Mary Lake roof pendant............................................ 42
Marginal Border Zones ............................................... 43
Transgressive contacts .............................................. 43
Upper contact against Lower Zone troctolite............................ 43
Discussion ........................................................ 44
Stratigraphy of the Layered Series...................................... 45
Lower Zone....................................................... 45
Lower Zone ..................................................... 45
Discussion .................................................... 45
Upper Zone ....................................................... 46
Upper Zone b ................................................... 47
Other subzones .................................................. 47
Whalear Lake transgressive zone (x) .................................. 48
Origin .......................................................... 48
Fine-grained facies of Upper Zone (y)................................. 48
Origin .......................................................... 49
Lenses and segregations............................................... 50
Gabbroic lenses.................................................... 51
Discussion ...................................................... 51
Anorthosite lenses.................................................. 51
Discussion ...................................................... 52
Pyroxenite and saxonite lenses ....................................... 52
Discussion ...................................................... 53
Structure ............................................................. 57
Radial ridges in the floor.............................................. 57
Border Zones ........................................................ 58
Layered Series ....................................................... 58
Layering ......................................................... 58
Description ..................................................... 58
Centimeter-scale layering ........................................ 59
Graded layering ............................................... 60
Anastamosed layering .......................................... 60
Disturbed layering ............................................. 60.
Discussion .................................................. 61
Thickness of mush ............................................. 62
Megascopic current indicators.................................... 62
Fabric ........................................................... 63
Lamination ..................................................... 63
Olivine lineation ................................................. 63
Attitude of layering................................................. 64
Origin of dips ................................................... 64
On the origin of layering.............................................. 66
General review .................................................... 66
Evidence for convection............................................. 67
Mechanism of convection ........................................... 67
Periodicity ........................................................ 68
Rafting ......................................................... 68
Thermal periodicity from growth on the floor......................... 69
Chemical periodicity.............................................. 69
Other effects on velocity .......................................... 71
Geometry of the Kiglapait convection pattern .......................... 72
Sites of nucleation.................................................. 72
Sorting mechanism ................................................. 73
Sorting sites ....................................................... 75
Transport ......................................................... 76
Deposition, growth on the floor, and upward transport................... 76
Centimeter-scale layering ............................................ 77
Role of water pressure .............................................. 77
Summary ......................................................... 78
Cross sections and volume estimates..................................... 78
Cross sections ..................................................... 78
Assumptions .................................................... 79
Nature of floor ................................................ 79
Correlation.................................................... 79
Central thickness............................................... 80
Roof ......................................................... 80
Border Zones.................................................. 80
Section AB...................................................... 80
Section CD...................................................... 81
Section EF...................................................... 81
Volume estimates .................................................. 81
Discussion ...................................................... 82
Jointing............................................................. 82
Origin ............................................................ 83
Petrography ........................................................... 85
Cumulate theory ..................................................... 85
Résumé of Kiglapait rocks............................................. 86
Outer Border Zone ................................................... 87
Field appearance................................................... 87
Rocks from the main unit ........................................... 87
Problems of unusual mineral compositions ........................... 89
Phase layering................................................... 90
Contact rocks .....................................................
OBZ xenoliths ..................................................... 91
Summary and discussion ............................................ 92
Disputed origin of Outer Border Zone ................................. 92
Inner Border Zone ................................................... 93
Field appearance................................................... 9?
QT
Petrography .......................................................
Lower Zone ......................................................... ^
QC
Field appearance...................................................
95
Petrography .......................................................
Fine, granular varieties ........................................... 96
Transition to Upper Zone ...........................................
Upper Zone......................................................... 97
General features ................................................... 97
Petrography ....................................................... 98
Upper Border Zone................................................... 99
Mineralogy ...........................................................103
Determinative methods ...............................................103
Plagioclase ..........................................................104
Inclusions.........................................................104
Twinning .........................................................106
Chemical analyses..................................................106
Antiperthite .......................................................107
Composition and variability..........................................107
Structural state ....................................................108
Olivine .............................................................HI
Chemical analyses..................................................Ill
Composition ......................................................112
Orthopyroxene ......................................................112
Border Zone relations ..............................................113
Composition ....................................................114
Chemical analysis..................................................114
A1..0, as a function of pressure................................... 115
Clinopyroxene .......................................................116
Composition ......................................................116
Chemical analysis..................................................118
Tie lines to olivines................................................118
Discussion ......................................................119
Hornblende .........................................................120
Alkali feldspar ......................................................120
Accessory minerals...................................................121
Oxides ...........................................................121
Sulfides ..........................................................121
Apatite ...........................................................122
Biotite ...........................................................122
Discussion ......................................................122
Mineral variation ......................................................123
Introduction.........................................................123
Local mineral variation...............................................124
Small-scale variation ...............................................124
Representation of structural state ...................................126
Discussion ......................................................127
Outcrop-scale variation..............................................128
Plagioclase structural state.........................................129
Mineral variation in the layered series...................................132
Preliminary bulk composition estimate ....................................135
Introduction.........................................................135
Bulk mineral composition .............................................135
Estimated bulk chemical composition....................................136
Evaluation of marginal OBZ as a chill...................................136
Speculations on the magma type........................................137
The syenite-trachyte problem...........................................140
References cited .........................................................143
Index ..................................................................199
|
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| id | DE-604.BV012756051 |
| illustrated | Illustrated |
| indexdate | 2024-07-09T18:33:06Z |
| institution | BVB |
| isbn | 0813711126 |
| language | German |
| oai_aleph_id | oai:aleph.bib-bvb.de:BVB01-008673479 |
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| physical | 204 S. Ill., graph. Darst., Kt. 2 Kt. |
| publishDate | 1969 |
| publishDateSearch | 1969 |
| publishDateSort | 1969 |
| record_format | marc |
| series | Geological Society of America: Memoir |
| series2 | Geological Society of America: Memoir |
| spelling | Morse, Stearns A. Verfasser aut The Kiglapait layered intrusion, Labrador S. A. Morse Geology of the Kiglapait layered intrusion, coast of Labrador, Canada [Boulder, Colo.] 1969 204 S. Ill., graph. Darst., Kt. 2 Kt. txt rdacontent n rdamedia nc rdacarrier Geological Society of America: Memoir 112 Zugl.: Montreal, CA, McGill Univ., Diss., 1961/62 u.d.T.: Morse, Stearns A.: Geology of the Kiglapait layered intrusion, coast of Labrador, Canada Intrusão larpcal Intrusions (Geology) Newfoundland and Labrador (DE-588)4113937-9 Hochschulschrift gnd-content Geological Society of America: Memoir 112 (DE-604)BV035915045 112 HBZ Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=008673479&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Morse, Stearns A. The Kiglapait layered intrusion, Labrador Geological Society of America: Memoir Intrusão larpcal Intrusions (Geology) Newfoundland and Labrador |
| subject_GND | (DE-588)4113937-9 |
| title | The Kiglapait layered intrusion, Labrador |
| title_alt | Geology of the Kiglapait layered intrusion, coast of Labrador, Canada |
| title_auth | The Kiglapait layered intrusion, Labrador |
| title_exact_search | The Kiglapait layered intrusion, Labrador |
| title_full | The Kiglapait layered intrusion, Labrador S. A. Morse |
| title_fullStr | The Kiglapait layered intrusion, Labrador S. A. Morse |
| title_full_unstemmed | The Kiglapait layered intrusion, Labrador S. A. Morse |
| title_short | The Kiglapait layered intrusion, Labrador |
| title_sort | the kiglapait layered intrusion labrador |
| topic | Intrusão larpcal Intrusions (Geology) Newfoundland and Labrador |
| topic_facet | Intrusão Intrusions (Geology) Newfoundland and Labrador Hochschulschrift |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=008673479&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
| volume_link | (DE-604)BV035915045 |
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