Komatiites: Ed.: N. T. Arndt ...
Gespeichert in:
| Format: | Buch |
|---|---|
| Sprache: | English |
| Veröffentlicht: |
London u.a.
Allen & Unwin
1982
|
| Schlagworte: | |
| Online-Zugang: | Inhaltsverzeichnis |
| Beschreibung: | XVII, 526 S. Ill., graph. Darst., Kt. |
| ISBN: | 0045520194 |
Internformat
MARC
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| 245 | 1 | 0 | |a Komatiites |b Ed.: N. T. Arndt ... |c ed. by N. T. Arndt ... |
| 264 | 1 | |a London u.a. |b Allen & Unwin |c 1982 | |
| 300 | |a XVII, 526 S. |b Ill., graph. Darst., Kt. | ||
| 336 | |b txt |2 rdacontent | ||
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Datensatz im Suchindex
| _version_ | 1804115606895591424 |
|---|---|
| adam_text | Contents
Preface v
Acknowledgements vi
list of tables xiii
List of contributors xv
PART 1 : INTRODUCTION 1
1 Komatiites - an historical review. R. P. Viljoen andM. J. Viljoen 5
1.1 Introduction 5 1.4 Other Archaean komatiites 14
1.2 The history of early geological in- 1.5 Present developments in studies
vestigations in the Barberton on komatiites 15
Mountain Land 6 References 15
1.3 The Upper Mantle Project in the
Barberton Mountain Land 8
2 What is a komatiite? N. T. Arndt and E. G. Nisbet 19
2.1 Original usage 19 2.5 A proposal 23
2.2 Development of terminology 19 2.6 Conclusions 25
2.3 Diagnostic features 21 Acknowledgements 25
2.4 The current situation 21 References 26
3 Phanerozoic analogues of komatiitic basalts. W. E. Cameron and E. G.
Nisbet 29
3.1 Introduction 29 3.5 Discussion 46
3.2 Komatiitic basalts: a petro- Acknowledgements 48
______________________r____ __ 48
3.3
3.4
PART 2: REGIONAL SURVEYS 51
4 The nature and distribution of Archaean komatiite volcanics in South Africa.
M. J. Viljoen, R. P. Viljoen and T. N. Pearton 53
4.1 Introduction 53 4.4 Conclusions 77
4.2 Regional distribution of green- Acknowledgements 78
stone belts and komatiites 54 References 78
4.3 Geochemistry 64
5 The Ventersdorp Supergroup — the youngest komatiitic sequence in
South Africa. /. R. Mclver, R. G. Caw thorn and B. A. Wyatt 81
5.1 Introduction 81 5.4 Compositional patterns in basalts 87
5.2 The Ventersdorp Supergroup 82 5.5 Comment 89
5.3 The komatiitic affinity of the Acknowledgements 89
Meredale lavas 85 References 90
VU
Introduction 29 3.5 Discussion
Komatiitic basalts: a pétro- Acknowledgements
graphie and chemical description 30 References
Phanerozoic analogues 33
Mineral and whole rock compo-
sitions 43
CONTENTS
6 Possible komatiitic affinity of the Bushveld Complex, South Africa.
R. G. Cawthorn and G. Davies 91
6.1 Introduction 91 6.3 Conclusions 95
6.2 Parental magmas to Proterozoic Acknowledgements 95
layered complexes 91 References 96
7 Komatiites in Zimbabwe. E. G. Nisbet, M. J. Bickle, A. Martin, J. L.
97
7.5 Komatiites in the Upper Green-
stones 100
7.6 Geochemistry 100
Acknowledgements 103
References 103
Or pen and J. F. Wilson
7.1 Introduction 97
7.2 Regional setting: the Rhodesian
Archaean Craton 97
7.3 The 3.5 Ga terrain ( Sebakwian ) 98
7.4 Komatiites in the Lower Green-
stone sequences ( Lower
Bulawayan ) 99
8 Komatiites in the Pilbara Block, Western Australia. M. E. Barley and
M. J. Bickle 105
8.1 Introduction 105 8.5 Geochemistry 111
8.2 Regional setting 105 References 114
8.3 Metamorphism 107
8.4 Field associations, character-
istics, textures and mineralogy 108
Komatiites in the Yilgarn Block, Western Australia. R. A. Binns, J. A.
Hallberg and J. H. Taplin l ! 7
*
9.1 Introduction 117 9.6 Textures and mineralogy
9.2 Regional setting 117 9.7 Geochemistry
9.3 Age 119 Acknowledgements
9.4 Metamorphism 120 References
9.5 Field characteristics and
associates 120
10 Komatiites and the komatiitic series of the Finnish greenstone belts.
B. Auvray, S. Biais, B.-M. Jahn and D. Piquet 131
10.1 Introduction 131 10.8 Chemical composition of the
10.2 Geological setting 131 komatiitic series rocks 137
10.3 Ages 133 10.9 Trace element geochemistry 141
10.4 Metamorphism 134 10.10 Criteria for distinction between
10.5 Komatiites and associated rocks 135 the komatiitic and tholeiitic
10.6 Mode of emplacement of series in Finland 144
komatiites 135 References 145
10.7 Mineral composition and textures
in the komatiitic series rocks 137
VUl
CONTENTS
11 Komatiites in the Ontario portion of the Abitibi belt. L. S. Jensen and
D. R. Pyke 147
11.1 Regional setting 147 11.6 Kirkland Lake area 152
11.2 Ages 148 11.7 Chemical composition 154
11.3 Nomenclature 149 11.8 Discussion 156
11.4 Munro— Lake Abitibi area 149 References 156
11.5 Timmins—Matachewan area 151
12 Komatiitic basalts of the Cape Smith foldbelt, New Quebec, Canada.
A. Hynes and D. Francis 159
12.1 Introduction 159 12.7 Intrusions 164
12.2 Regional setting and age 159 12.8 Geochemistry 165
12.3 Stratigraphy and structure 160 12.9 Discussion 168
12.4 Metamorphism 161 12.10 Summary and conclusions 169
12.5 Stratigraphy of the Chukotat References 169
Group 162
12.6 Morphology and petrography of
volcanic rocks 163
13 Magnesian basalts from the Archaean terrains of Minnesota. K. J. Schulz 171
13.1 Introduction 171 13.4 Petrogenesis 185
13.2 Magnesian basalts of the Ver- 13.5 Conclusion 185
milion district 171 References 186
13.3 Minnesota River Valley
amphibolites 184
14 Ordovician komatiites and associated boninite-type magnesian lavas
from Betts Cove, Newfoundland. H. D. Upadhyay 187
14.1 Introduction 187 14.6 Mineralogy and textures 191
14.2 Regional setting 188 14.7 Geochemistry 194
14.3 Age 190 14.8 Discussion 196
14.4 Deformation and metamorphism 190 Acknowledgements 197
14.5 Manner of emplacement 190 References 197
15 Komatiites from Gorgona Island, Colombia. L. M. Echeverria 199
15.1 Regional setting 199 15.5 Textures and mineralogy 203
15.2 Age 201 15.6 Geochemistry 205
15.3 Metamorphism 202 References 209
15.4 Field characteristics 202
PART 3 : TEXTURES AND FIELD CHARACTERISTICS 211
16 Spinifex-textured komatiites: a review of textures, mineral
compositions and layering. C. H. Donaldson 213
16.1 Introduction 213 16.5 Solidification of komatiite 234
16.2 Terminology 215 magmas 241
16.3 Textures and crystal shapes in 16.6 Conclusion 242
komatiites 218 Acknowledgements 242
16.4 Mineral compositions in spinifex- References
textured komatiites 229
IX
CONTENTS
PART 4: ALTERATION AND METAMORPHISM
17 Progressive metamorphism of komatûtes and related Archaean lavas of
the Abitibi area, Canada. W. T. Jolly 245
17.1 Introduction 247 17.5 Upper amphiboüte faciès 264
17.2 Prehnite-pumpellyite faciès 251 17.6 Conclusions 264
17.3 Greenschist faciès 258 Acknowledgements 265
17.4 Lower amphibolite faciès 261 References 265
18 The oxygen isotope geochemistry of komatiites: evidence for water—
rock interaction. D. W. Beaty and H. P. Taylor Jr 267
18.1 Introduction 267 18.4 Oxygen isotope data 272
18.2 Sampling and experimental 18.5 Conclusions 278
technique 268 Acknowledgements 279
18.3 Metamorphic petrology 269 References 279
PART 5 : GEOCHEMISTRY AND THE COMPOSITION OF THE MANTLE
IN THE ARCHAEAN 281
19 Some geochemical aspects of alteration and genetic relations in
komatiitic suites. A. E. Beswick 283
305
306
307
19.1 Introduction 283 19.5 Summary
19.2 General geochemical charac- Acknowledgements
teristics 284 References
19.3 Alteration 290
19.4 Genetic aspects of komatiite
geochemistry 300
20 Geochemistry of Munro Township basalts. N. T. Arndt and R. W.
Nesbitt 309
20.1 Introduction 309 20.6 A possible explanation for
20.2 Komatiitic and tholeiitic basalts acicular pyroxene textures 328
in Munro Township 311 20.7 Conclusions 328
20.3 Trace element geochemistry 320 Acknowledgements 329
20.4 Formation of the Munro basaltic References 329
lavas 326
20.5 The relationship between basalts
and komatiites 327
21 Trace element characteristics of komatiites and komatiitic basalts from
the Abitibi metavolcanic belt of Quebec. /. N. Ludden and L. Gêlinas ^31
344
344
345
21.1 Introduction 331 21.4 Summary
21.2 Alteration 332 Acknowledgements
21.3 Geochemical approach 333 References
CONTENTS
22 Geochemistry and petrogenesis of komatiites from the Barberton green-
stone belt, South Africa. H. S. Smith and A. J. Erlank 347
22.1 Introduction 348 22.5 Petrogenesis of Barberton ultra-
22.2 General characteristics and mafic magmas 384
mineralogy of the komatiites 348 22.6 Conclusions 392
22.3 Geochemical features of the Acknowledgements 393
Barberton komatiites 351 References 393
22.4 Compositional variations of
komatiites and implications for
a heterogeneous mantle 375
23 Nd and Sr isotopic studies of komatiites and related rocks. A. Zindler 399
23.1 Introduction 399 23.7 Evolutionary implications of
23.2 Cape Smith-Wakeham Bay belt, initial 143Nd:144Nd and 87Sr:
New Quebec 401 86Sr from komatiites and related
23.3 Abitibi belt, Superior Province 405 rocks 411
23.4 Results from other studies 407 23.8 Constraints on petrogenetic
23.5 Comparison of Sm—Nd and processes 415
Rb—Sr 409 23.9 Summary and conclusions 416
23.6 Bulk earth evolution of 143Nd : Acknowledgements 417
144Nd and 87Sr:86Sr 409 References 417
PART 6: ECONOMIC GEOLOGY 421
24 Physical and chemical constraints on genetic models for komatiite-
related Ni-sulphide deposits. A. J. Naldrett and I. H. Campbell 423
24.1 Occurrence and types 423 24.3 Models of ore emplacement 425
24.2 Main features of flow-related 24.4 Discussion and conclusions 432
deposits 423 References 434
25 Palladium and indium in komatiites and associated rocks: application
to petrogenetic problems. R. R. Keays 435
25.1 Introduction 435 25.7 Associated rocks 449
25.2 Data base 436 25.8 Interpretation 449
25.3 Magmatic sulphides 442 25.9 Summary and conclusions 454
25.4 Spinifex-textured komatiites 445 Acknowledgements 455
25.5 Dunitic komatiites 447 References 455
25.6 Thin komatiite flows 448
26 Gold and antimony mineralization in altered komatiites of the
Murchison greenstone belt, South Africa. T. N. Pearton 459
26.1 Introduction 459 26.5 Mineralization in the Antimony 471
26.2 Regional geology of the line
Murchison greenstone belt 460 26.6 Mineralization in altered 472
26.3 Geological description of the Archaean komatiites 473
Antimony line and vicinity 462 26.7 Conclusions 473
26.4 The geochemistry of the Acknowledgements 474
Antimony Line rocks 464 References
XI
CONTENTS
PART 7 : PETROGENESIS
27 The magnesium contents of komatiitic liquids. M. J. Bickle 479
27.1 Introduction 479 27.5 Conclusions 492
27.2 Textures 480 Acknowledgements 492
27.3 Liquid compositions inferred References 493
from mineral compositions 484
27.4 Fractionation or accumulation
trends — constraints on pheno-
cryst composition 490
28 Genesis of Archaean komatiites in a wet ultramafic subducted plate.
C. J. Allègre 495
28.1 Introduction: the heat problem 28.4 Conclusion 499
for komatiite genesis in the Acknowledgements 499
Archaean 495 References 500
28.2 The wet mantle hypothesis 497
28.3 The petrogenetic cycle in the
Archaean and the Archaean sub-
duction zone 498
29 The tectonic setting and petrogenesis of komatiites. E. G. Nisbet 501
29.1 Introduction 501 29.6 The nature of the crust and the
29.2 Geological problems 501 upper mantle: further thoughts 516
29.3 Analogous modern rocks 506 29.7 Conclusions 517
29.4 Some physical constraints on Acknowledgements 518
komatiitic eruption 506 References 518
29.5 Model building: the genesis of
komatiites 513
Author index 521
Subject and locality index 523
xu
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| spelling | Komatiites Ed.: N. T. Arndt ... ed. by N. T. Arndt ... London u.a. Allen & Unwin 1982 XVII, 526 S. Ill., graph. Darst., Kt. txt rdacontent n rdamedia nc rdacarrier Komatiit (DE-588)4384364-5 gnd rswk-swf Komatiit (DE-588)4384364-5 s DE-604 Arndt, Nicholas 1947- Sonstige (DE-588)136471021 oth HBZ Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=000729390&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Komatiites Ed.: N. T. Arndt ... Komatiit (DE-588)4384364-5 gnd |
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| title | Komatiites Ed.: N. T. Arndt ... |
| title_auth | Komatiites Ed.: N. T. Arndt ... |
| title_exact_search | Komatiites Ed.: N. T. Arndt ... |
| title_full | Komatiites Ed.: N. T. Arndt ... ed. by N. T. Arndt ... |
| title_fullStr | Komatiites Ed.: N. T. Arndt ... ed. by N. T. Arndt ... |
| title_full_unstemmed | Komatiites Ed.: N. T. Arndt ... ed. by N. T. Arndt ... |
| title_short | Komatiites |
| title_sort | komatiites ed n t arndt |
| title_sub | Ed.: N. T. Arndt ... |
| topic | Komatiit (DE-588)4384364-5 gnd |
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