Archive · collection · 1983

Geochemistry and minerals at DSDP Hole 70-504B

Listed in PANGAEA

In three veins from the lower part of Deep Sea Drilling

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Hole 504B, 298 meters below the top of basement, primary augite is replaced by aegirine-augite. This transformation occurs only in subophitic basalts, at the contact with veins which always include a dark-olive, Mg-rich clay mineral. Talc occurs in one of these veins; it can be regarded either as a vein constituent or as a product of augite alteration.

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Melanite (Ca,Fe,Ti-rich garnet) appears in only one of these three veins, where a Ca-carbonate is associated with a Mg-rich clay mineral. The occurrence of melanite in Hole 504B could be due to the conjunction of particular conditions: (1) basalt with a subophitic texture, (2) presence of hydrothermal fluids carrying Ca, Fe, Si, Ti, Al, Mg, and Na, (3) rather high temperatures. Possibly the melanite and aegirine-augite formed by deuteric alteration.

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From keywords: Earth & Environmental Science

Provenance · 1 source records, 7 field assertions

Source	Key	Last seen	Raw
PANGAEA	oai:pangaea.de:doi:10.1594/PANGAEA.816486	13 d ago	JSON v1

Field	Assertion	Extractor	Evidence
access_level	source · PANGAEA	connector:pangaea@1.0.0
concepts[field].local:field:earth-environmental	mapping · PANGAEA	connector:pangaea@1.0.0
description	source · PANGAEA	connector:pangaea@1.0.0	/metadata/dc/description
license	source · PANGAEA	connector:pangaea@1.0.0	/metadata/dc/rights
publication_date	source · PANGAEA	connector:pangaea@1.0.0
spatial	source · PANGAEA	connector:pangaea@1.0.0
title	source · PANGAEA	connector:pangaea@1.0.0	/metadata/dc/title

Geochemistry and minerals at DSDP Hole 70-504B

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