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Cathodoluminescence and Trace Elements in Quartz : Clues to Metal Precipitation Mechanisms at the Asachinskoe Gold Deposit in Kamchatka

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/38463

Title: Cathodoluminescence and Trace Elements in Quartz : Clues to Metal Precipitation Mechanisms at the Asachinskoe Gold Deposit in Kamchatka
Authors: Takahashi, Ryohei Browse this author
Müller, Axel Browse this author
Matsueda, Hiroharu Browse this author
Okrugin, Victor M. Browse this author
Ono, Shuji Browse this author
van den Kerkhof, Alfons Browse this author
Kronz, Andreas Browse this author
Andreeva, Elena D. Browse this author
Keywords: Cathodoluminescence
Trace Element
Quartz
Epithermal Gold deposit
Asachinskoe
Issue Date: 2008
Publisher: 21st Century COE for Neo-Science of Natural History, Hokkaido University
Citation: Edited by Hisatake Okada, Shunsuke F. Mawatari, Noriyuki Suzuki, Pitambar Gautam. ISBN: 978-4-9903990-0-9
Journal Title: Origin and Evolution of Natural Diversity : Proceedings of the International Symposium, The Origin and Evolution of Natural Diversity, held from 1-5 October 2007 in Sapporo, Japan
Start Page: 175
End Page: 184
Abstract: The Asachinskoe epithermal gold deposit in South Kamchatka, Russia, is a low-sulfidation type deposit which consists of Au-Ag bearing quartz-adularia-illite veins. Cathodoluminescence (CL) analysis using optical microscope and scanning electron microscope and trace element analysis of quartz using electron probe micro-analyzer (EPMA) were performed to elucidate the relationships between CL structures, trace element concentrations of different quartz generations, and metal precipitation mechanism of the Asachinskoe deposit. Five sequences of quartz crystallization can be distinguished within the mineralized vein of the bonanza zone. Most distinctive trace elements in quartz are Al (av. 1463 ppm) and K (av. 350 ppm). Colloform and microcrystalline quartz with moderate to dull red-brown CL coexists with electrum (Au-Ag alloy), naumannite-aguilarite (ss) and polybasite-pearceite (ss). The Au-Ag-Se precipitation is related to fluid boiling, and the Se enrichment is attributed to relative oxidizing mineralization conditions. Almost non-luminescent, dark brown luminescent quartz forming the matrix of the hydrothermal breccia coexists with electrum, tetrahedrite-tennantite (ss) and covellite. The Au-Ag-Cu precipitation is associated with rapidly precipitated quartz and adularia, and is due to sudden decompression and fluid boiling related to the hydrothermal brecciation.
Description: International Symposium, "The Origin and Evolution of Natural Diversity". 1–5 October 2007. Sapporo, Japan.
Conference Name: International Symposium, "The Origin and Evolution of Natural Diversity"
Conference Place: Sapporo
Type: proceedings
URI: http://hdl.handle.net/2115/38463
Appears in Collections:Origin and Evolution of Natural Diversity > Proceedings

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