The geology of the Western Cordillera of northern Peru:
Gespeichert in:
| Format: | Buch |
|---|---|
| Sprache: | English |
| Veröffentlicht: |
London
HMSO
1981
|
| Schriftenreihe: | Overseas memoir
5 |
| Schlagworte: | |
| Online-Zugang: | Inhaltsverzeichnis |
| Beschreibung: | X, 143 S. Ill., graph. Darst., Kt. 2 Kt. |
| ISBN: | 0118841181 |
Internformat
MARC
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| 245 | 1 | 0 | |a The geology of the Western Cordillera of northern Peru |c E. J. Cobbing ... |
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Datensatz im Suchindex
| _version_ | 1804117753454395392 |
|---|---|
| adam_text | Titel: The geology of the Western Cordillera of northern Peru
Autor: Cobbing, E. J
Jahr: 1981
CONTENTS
One : Introduction 1
Climate and vegetation 1
Population 1
Access 1
History of the project 2
Two : Stratigraphy 4
Introduction 4
Pre-Mesozoic basement 4
Prccarnbrian- Upper Palaeozoic 4
Upper Triassic-Lower Jurassic 5
Pucara Group 5
Zana Group 6
Late Jurassic-Cretaceous 6
Tithonian-Berriasian 7
Chicama Formation 8
Oyon Formation 8
Puente Piedra Group 8
Tinajones Formation 8
Valanginian 8
Chimu Formation 9
Morro Solar, Herradura and Marcavilca formations 9
Tinajones Formation 9
Santa Formation 9
Hauterivian-Barrernian Aptian 10
Carhuaz Formation 11
Farrat Formation 11
Goyllarisquizga Formation 11
Western areas 12
Lower Albian 12
Inca Formation 12
Pariahuanca Formation 13
Western areas 13
Middle Albian 13
Middle Albian sedimentary sequence 13
Chulee Formation 13
Pariatambo Formation 14
Crisnejas Formation 14
Middle Albian volcanic sequence 14
Casma Group 14
Upper Albian -Santonian 15
Pulluicana Group 16
Quillquinan Group 16
Otuzco Group 16
Jumasha Formation 17
End-Cretaceous 17
Chota and Casapalca formations 17
Tertiary 18
Calipuy Group 18
Mio-Pliocene ignimbrites 19
Palaeotectonic development of the region 19
Norian-Lower Jurassic 19
Middle Jurassic 20
Titlwnian—Early Tertiary 20
Late Tertiary 21
Three: Structure 21
The palaeotectonic framework 21
Control of sedimentation by fractures 22
Age of folding 23
Structures in the eugeosvncline 24
Structures in the miogeosyncline 25
Structure within the miogeanticline 27
Structure on the Marañon Geanticline 28
Later folding 28
Discussion 29
Four: The Coastal Batholith 30
History of research 30
Pétrographie nomenclature 31
Units, super-units and segments 32
Plutons, pulses and surges 32
The envelope of the batholith 33
Gross relationship between the batholith and its
envelope 33
The volcanic--plutonic time relationship 34
Outline of the structure of the Cretaceous rocks 34
Regional metamorphism in the Casma Group 34
The components of the batholith 35
The gabbros, honiblende-gabbros and meladiorites 35
The Huaral Gabbro 36
The gabbros—a discussion 39
The granitoids: units and super-units 41
Sequence and disposition 41
The tonalité and quartz-diorite super-units 42
The Paccho Super-unit 42
Individual quartz-diorite intrusions 43
The Santa Rosa Super-unit 44
The Santa Rosa Super-unit in the Huaura
Complex 46
The Santa Rosa Super-unit in the Fortaleza
Complex 48
The Santa Rosa Super-unit in the Casma
Complex 48
The Santa Rosa Super-unit : a summary 50
The granites of the rectilinear plutons and ring
complexes 51
Puscao Super-unit 52
Puscao Super-unit : a summary 52
San Jerónimo Super-unit 53
San Jerónimo Super-unit : some special aspects 54
Im Mina Super-unit 54
Subordinate granitoid unassigned units 54
Late-stage granites : porphyrinic, monzogranites of Pativilca
type 55
Minor intrusions 56
Syenogranites 56
Other minor intrusions 56
Xenoliths 56
Rock textures 57
Intrusive breccias and tuflisitcs 57
The associated dyke swarm 58
The centred ring complexes 60
The Chancay Complex 62
The Quebrada Paros Complex 62
The Huaura Complex 62
The Fortaleza Complex 65
The association of the Fortaleza Centre with the
extrusives 65
Volcanicity related to the batholith 65
The structural control of emplacement 66
The regional alignment 66
Time of emplacement relative to the fold episodes 67
Local structural control 67
The location of the major intrusions 71
A general model 72
Mechanisms of intrusion: stoping, cauldron subsidence
and iluidisation 73
The mctamorphic effects 75
Volcanic rocks 75
Calcareous rocks 76
Argillaceous rocks 79
lutra-pluton effects 79
A model for the genesis of the magmas 80
A general model 80
Five: The Cordillera Blanca Batholith and the high-
level stocks 83
Cordillera Blanca Batholith 83
Structures in the intrusives 83
Structures in the country rocks 84
Thermal metamorphism 84
Age of emplacement 84
Southward extension of the batholith 85
Comparison of the Cordillera Blanca Batholith
with the Coastal Batholith 85
The high-level stocks 86
Emplacement 87
Geochemistry of selected samples from the high-level
stocks, the Cordillera Blanca, the Calipuy Volcanic
(»roup and the Mio-Pliocene ignimbrites 87
Six: The radiometric ages 90
Experimental methods and the interpretation of age
data 90
Previous work 91
Chronology of emplacement of the early units of the
Coastal Batholith 91
Geochronology of the Centred Ring Complexes 95
Post-Eocene intrusives east of the Coastal Batholith 98
Age determinations from the Cordillera Blanca
Batholith 99
The age of the Calipuy volcanics and the Mio-Pliocene
ignimbrites 101
Seven: The geochemical evolution of the intrusive
and volcanic rocks of central Peru 103
A proposed model 110
Eight: Reconnaissance mineral exploration of the
Western Cordilleran polymetallic mineral provinces
in northernmost Peru 111
Orientation surveys, sampling and analytical
methods 111
Dispersion from known copper porphyry 111
Lithological and seasonal factors 112
Regional sampling 112
Analytical methods 112
Principal anomalies 113
La Granja 113
Cañariaco 113
Pandachi 113
Pomahuaca anomalous region 114
Other anomalies 114
The principal anomalies and regional trends of
metallogenesis 114
Nine: Review of mineralisation and metallogeny in
the Western Cordilleran polymetallic province of
northern Peru 115
Synopsis of mineral deposits 117
Morococha/Casapalca group 117
Huarón group 117
Cerra de Pasco group 119
Raura/Huanzalá group 120
Cordillera Blanca (Antamina/Magistral/Pasto Bueno)
group 120
Cordillera Negra (Santa Toribio/Pashpa/Patara)
group 120
Quiruvilca/Chilete group 120
Michiquillay/La Huaca group 120
Discussion 121
Conclusion 123
Ten: Geomorphology 124
Eleven: General conclusions 126
References 130
Index 135
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| series | Overseas memoir |
| series2 | Overseas memoir |
| spelling | The geology of the Western Cordillera of northern Peru E. J. Cobbing ... London HMSO 1981 X, 143 S. Ill., graph. Darst., Kt. 2 Kt. txt rdacontent n rdamedia nc rdacarrier Overseas memoir 5 Geologie (DE-588)4020227-6 gnd rswk-swf Peru Nord (DE-588)4219357-6 gnd rswk-swf Anden (DE-588)4001912-3 gnd rswk-swf (DE-588)4143413-4 Aufsatzsammlung gnd-content Anden (DE-588)4001912-3 g Geologie (DE-588)4020227-6 s Peru Nord (DE-588)4219357-6 g DE-604 Cobbing, E. J. Sonstige oth Overseas memoir 5 (DE-604)BV001636154 5 HBZ Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=002153571&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | The geology of the Western Cordillera of northern Peru Overseas memoir Geologie (DE-588)4020227-6 gnd |
| subject_GND | (DE-588)4020227-6 (DE-588)4219357-6 (DE-588)4001912-3 (DE-588)4143413-4 |
| title | The geology of the Western Cordillera of northern Peru |
| title_auth | The geology of the Western Cordillera of northern Peru |
| title_exact_search | The geology of the Western Cordillera of northern Peru |
| title_full | The geology of the Western Cordillera of northern Peru E. J. Cobbing ... |
| title_fullStr | The geology of the Western Cordillera of northern Peru E. J. Cobbing ... |
| title_full_unstemmed | The geology of the Western Cordillera of northern Peru E. J. Cobbing ... |
| title_short | The geology of the Western Cordillera of northern Peru |
| title_sort | the geology of the western cordillera of northern peru |
| topic | Geologie (DE-588)4020227-6 gnd |
| topic_facet | Geologie Peru Nord Anden Aufsatzsammlung |
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