Composition of fluids in the lower crust inferred from metamorphic salt in lower crustal rocks
Article Abstract:
Granite genesis and orogenic processes can be understood through examining metamorphic processes in the lower crust, and its rheological properties. The composition and even presence of fluids in the lower crust addffects its rheological properties. A solid salt solution has been found with biotite and amphibole in granulites from lower crustal regions. The fluid appears to have been present in small amounts within the crust, and does not appear to have been stable over a long period in geological terms. The lower crust appears to have lacked a free fluid phase for the bulk of its history.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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Upwardly mobile hot crust
Article Abstract:
The Fiordland granulite of New Zealand exhibit a quick evolution to high-grade conditions at a depth of 40 kilometers and a subsequent granulite metamorphism that occurred during exhumation to 20 kilometers depth. The rocks end up in cooling after a fast exhumation. The Fiordland metamorphic terrains are caused by the temperature-pressure pathways of near-isobaric cooling and near-isothermal decompression, cooling, and exhumation processes.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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Accelerated hydration of the Earth's deep crust induced by stress pertubations
Article Abstract:
Metamorphic reactions relating to chains of mountains, and the role of fluids, are examined in detail
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
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