A Possible New Chromium Mineralization: A Discussion on the Formation of Chrome-Spinel of Gangshang Ultramafic Rocks in Su-Lu UHP Belt<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

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A Possible New Chromium Mineralization: A Discussion on the Formation of Chrome-Spinel of Gangshang Ultramafic Rocks in Su-Lu UHP Belt

详细信息

责任者：Chen Shizhong (Nanjing Institute of Geology and Mineral Resources ; China Geological Survey ; Nanjing 210016 ; China) ; Yang Jingsui
刊名：Earth Science Frontiers
出版年：2009
卷期：16(5)
关键词：铬尖晶石 ; chrome spinel ; 超镁铁质岩 ; ultramafics ; 铬铁矿矿床 ; chromite deposit ; 苏鲁造山带 ; Su-Lu Orogenic Belt
页码：p.232-244
图表：7 illus., 2 tables, 73 refs.
分类号：1001
issnNo：ISSN1005-2321
isbnNo：CN11-3370/P

摘要

Gangshang ultramafic rocks are mainly composed of garnet peridotites and dunite, which contain olivine, chrome-spinel, diopside, endiopside, and/or garnet, orthopyroxene, amphibole and phlogopite. Chrome-spinels in Gangshang ultramafic rocks are varied in composition, with Cr^#［100Cr/(Cr+Al)］ ranging from 51 to 89, and its variation in composition is related to the four stages of the evolution of ultramafic rocks. Along with the evolution of ultramafic rocks, Cr^# of chrome-spinels was increasing, Mg^#［100Mg/(Mg+Fe²⁺)］ of chrome-spinels was decreasing and the oxygen fugacity was increasing. In the course of amphibole facies and greenschist facies retrometamorphism, Cr, Mg and Al of chrome-spinels were reducing, but Fe was relatively increasing.

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