Ore-forming fluid constraints on illite crystallinity (IC) at Dexing porphyry copper deposit, Jiangxi Province |
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Authors: | JIN Zhangdong ZHU Jinchu JI Junfeng Lu Xinwei LI Fuchun |
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Institution: | 1. State Key Laboratory for Research of Mineral Deposits, Nanjing University, Nanjing 210093, China;Lake Sediment and Environment Laboratory, Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing 210008, China 2. State Key Laboratory for Research of Mineral Deposits, Nanjing University, Nanjing 210093, China |
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Abstract: | Illite, a distinctive kind of clay minerals of potassium alteration within the hydrothermal alteration zone, frequently occurs
at the Tongchang porphyry copper deposit ore field. The illite crystallinity (IC) value and expandability are mainly affected
by water/rock ratio or fluid flux. It was formed by illitization of plagioclase and micas during hydrothermal fluid-rock interaction
within the porphyry body and near the contact zone with wall rocks. Moreover, the negative correlation between illite index
(IC) and copper grade indicates that within the alteration zone, the smaller the illite crystallinity value, the higher the
alteration degree, and the higher the copper grade due to higher water/rock ratio. At lower levels of the porphyry body, however,
the illite crystallinity (IC) values are mainly controlled by temperature and time duration. |
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Keywords: | illite kübler index ore-forming fluid porphyry copper deposit |
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