SHI De-feng1, CHEN Xin-yue1，ZHANG Shu-gen2, LI Gui-xian3
(1. School of Civil Engineering, Hunan University of Science and Technology，Xiangtan 411201, China;
2. MOE Key Laboratory of Metallogenic Prediction of Nonferrous Metals, School of Geosciences and Info-Physics, Central South University, Changsha 410083, China.
3. Jiangxi Coalfield Geology Bureau, Yingtan 335000, China)
Abstract: Mineralogical mapping，optical microscope identification, X-ray diffraction and scanning electron microscope were applied to study characteristics of two kinds of garnet in distribution, appearance, composition, zoning and relation to mineralization from Dingjiashan Pb-Zn Ore District. Garnet in the research area distributes from northeast to southwest; diffraction curve of the first splits to peaks is according with grossularite and andradite; summation of grossularite and andradite in the second are around 90%; quality percentage of Fe and Al, grossularite and andradite are growth and decline. Those above characteristics prove that the two kinds of garnet are all continuous solid-solution series of grossularite and andradite. It is confirmed that Dingjiashan Pb-Zn Ore District is contact-metasomatic deposit. In the process of garnet crystallization, pH of the hydrogen and the redox condition in system changed. Cracks in garnet supplied some space to mineral sulfides.
Keywords: Dingjiashan Pb-Zn district; garnet; composition; zoning; mineralization significance
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ACTA MINERALOGICA SINICA Vol. 35, No. 3, 2015, Page 323-330
