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Fluid inclusion evidence for widespread shallow hydrothermal activity in South Victoria Land, Antarctica

Craw, D. ; Morrison, A. D. ; Walcott, C. R.

New Zealand journal of geology and geophysics, 1992-03, Vol.35 (1), p.21-28 [Periódico revisado por pares]

WELLINGTON: Taylor & Francis Group

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Título:
Fluid inclusion evidence for widespread shallow hydrothermal activity in South Victoria Land, Antarctica
Autor: Craw, D. ; Morrison, A. D. ; Walcott, C. R.
Assuntos: Antarctica ; Beacon Supergroup ; calcite ; Earth sciences ; Earth, ocean, space ; Engineering and environment geology. Geothermics ; Exact sciences and technology ; Ferrar Dolerite ; fluid inclusions ; Geology ; Geophysics: general, magnetic, electric and thermic methods and properties ; Geosciences, Multidisciplinary ; Geothermics ; hydrothermal veins ; Internal geophysics ; Physical Sciences ; quartz ; rifting ; Science & Technology
É parte de: New Zealand journal of geology and geophysics, 1992-03, Vol.35 (1), p.21-28
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: Sparse but widespread veins cut Paleozoic basement, overlying Devonian-Triassic Beacon sediments and Jurassic Ferrar Dolerite in South Victoria Land. The hydrothermal activity was mainly fracture controlled, and resulted in formation of well-defined steeply dipping veins. The fluids that produced these veins were variable in composition, ranging from very low salinity water, through low-moderate salinity CO2-bearing water, to CaCl2-NaCl-bearing brine. Mineral deposition occurred during fluid immiscibility or boiling in several veins. Temperatures of deposition range from 390°C down to 120°C. Fluid pressure was estimated for four samples, and these range between 0.4 and 40 MPa, corresponding to depths of between 40 and 4000 m. Several veins were deposited during decreasing temperature and possibly decreasing depth. At least some of the hydrothermal activity was related to high heat flow accompanying intrusion of the Jurassic Ferrar Dolerite. Other activity occurred progressively during uplift of the Royal Society Range during mid-late Cenozoic rifting in the Ross Sea region.
Editor: WELLINGTON: Taylor & Francis Group
Idioma: Inglês

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Fluid inclusion evidence for widespread shallow hydrothermal activity in South Victoria Land, Antarctica

Craw, D. ; Morrison, A. D. ; Walcott, C. R.

WELLINGTON: Taylor & Francis Group

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