Isotopic composition of hydrothermal precipitates from the Mariana Trough.

Botz, R. W. and Stoffers, P. (1992) Isotopic composition of hydrothermal precipitates from the Mariana Trough. Marine Geology, 108 (2). pp. 239-243. DOI 10.1016/0025-3227(92)90175-h.

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Abstract

Hydrothermal silica chimneys from the axial region of the Mariana Trough were investigated for their oxygen isotopic composition. The opal-CT samples revealed [delta]18O values between 28.5 and 31.2[per mille sign]. This range of [delta] values indicates precipitation temperatures between 31.5° and 57.2° C (minimum and maximum temperatures using different equations describing the silica-water equilibrium and assuming a [delta]18O value of 0[per mille sign] for the hydrothermal fluid). Two coexisting (with opal-CT) nontronite samples have an isotopic composition of 26.3 and 26.6[per mille sign]. A formation temperature near 20°C results for this nontronite. It is inferred that both mineralogical phases (opal-CT and nontronite) are not cogenetic as they did not precipitate at the same temperature from the same solution.

Document Type: Article
Research affiliation: Kiel University
Refereed: No
DOI etc.: 10.1016/0025-3227(92)90175-h
ISSN: 0025-3227
Date Deposited: 02 Feb 2012 09:28
Last Modified: 23 Sep 2019 19:24
URI: http://oceanrep.geomar.de/id/eprint/16392

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