Early Jurassic felsic and associated mafic meta-igneous rocks in Otago Schist, Central Otago, New Zealand

2018 ◽  
Vol 61 (2) ◽  
pp. 237-246 ◽  
Author(s):  
James K. Mortensen ◽  
J. Anthony Coote ◽  
David Craw ◽  
Douglas J. MacKenzie
Keyword(s):  
New Zealand ◽  
Early Jurassic ◽  
Igneous Rocks ◽  
Otago Schist

New trigonioid bivalves from the Early Jurassic to earliest Cretaceous of the Antarctic Peninsula region: systematics and austral paleobiogeography

1995 ◽  
Vol 69 (1) ◽  
pp. 66-84 ◽  
Author(s):  
Simon R. A. Kelly
Keyword(s):  
New Zealand ◽  
Antarctic Peninsula ◽  
Southern Africa ◽  
Late Jurassic ◽  
Early Jurassic ◽  
South Shetland Islands ◽  
Shetland Islands ◽  
Livingston Island ◽  
History Of ◽  
The Antarctic

New discoveries of trigonioid bivalves are documented from three areas in the Antartic Peninsula: the Fossil Bluff Group of Alexander Island, the Latady Formation of the Orville Coast, and the Byers Group of Livingston Island, South Shetland Islands. Eleven taxa are described, representing six genera or subgenera. The faunas are characterized by genera including Vaugonia (Vaugonia), the first Early Jurassic trigonioid recognized on the continent; Vaugonia (V.) and V. (Orthotrigonia?) in the Late Jurassic; and Iotrigonia (Iotrigonia), Myophorella (Scaphogonia), and Pterotrigonia (Pterotrigonia), which span the Jurassic–Cretaceous boundary, reaching the Berriasian stage. The following species are new: Pterotrigonia (P.) cramei n. sp., Pterotrigonia (P.) thomsoni n. sp., Vaugonia (V.) orvillensis n. sp., and V. (Orthotrigonia?) quiltyi n. sp. The faunas show affinities with those of New Zealand and southern Africa. Trigonioids characterize the shallower marine biofacies in the Jurassic of the Antarctic and reflect the principal shallowing events in the history of the region.

Structure of the Blue Lake Fault Zone, Otago Schist, New Zealand

2011 ◽  
Vol 54 (3) ◽  
pp. 311-328 ◽  
Author(s):  
A Henne ◽  
D Craw ◽  
D MacKenzie
Keyword(s):  
New Zealand ◽  
Fault Zone ◽  
Blue Lake ◽  
Otago Schist

scholarly journals Diagenetic pyrite as a source for metals in orogenic gold deposits, Otago Schist, New Zealand

2012 ◽  
Vol 55 (2) ◽  
pp. 137-149 ◽  
Author(s):  
Ross Large ◽  
Helen Thomas ◽  
Dave Craw ◽  
Anicia Henne ◽  
Simon Henderson
Keyword(s):  
New Zealand ◽  
Gold Deposits ◽  
Orogenic Gold ◽  
Orogenic Gold Deposits ◽  
Otago Schist

Triassic olivine-normative diabase from Northumberland Strait, eastern Canada: implications for continental rifting

1986 ◽  
Vol 23 (7) ◽  
pp. 1013-1021 ◽  
Author(s):  
Georgia Pe-Piper ◽  
Lubomir F. Jansa
Keyword(s):  
Early Jurassic ◽  
Igneous Rocks ◽  
Late Triassic ◽  
Geochemical Evolution ◽  
High Alumina ◽  
Continental Rifting ◽  
Eastern Canada ◽  
Mafic Rocks ◽  
Eu Anomaly ◽  
Igneous Activity

Two intervals of mafic igneous rocks were encountered within a Silurian to Carboniferous sequence in an exploratory offshore well located in the Gulf of St. Lawrence, eastern Canada. Geochemical and radiometric analyses show that the lower mafic rocks are Early Silurian continental tholeiite lavas, with their radiogenic clock thermally reset during the Late Devonian. The upper igneous interval consists of several dikes of high-alumina diabase characterized by flat, relatively unenriched REE spectra and a positive Eu anomaly. This diabase resembles olivine tholeiites. Two K/Ar dates suggest a Late Triassic age for these intrusions. The dike composition differs from that of known Late Triassic and Early Jurassic continental tholeiites nearby in Nova Scotia, which are associated with a late stage of continental rifting. The Triassic – Early Jurassic igneous activity shows a pattern of geochemical evolution that we relate to mantle upwelling.

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