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Published in:
2005 | OriginalPaper | Chapter
Formation mechanisms of oreshoots in massive sulphide orebodies at Hongtoushan, NE China
Authors : Gu Lianxing, Tang Xiaoqian, Zheng Yuanchuan, Wu Changzhi, Lu Jianjun, Ni Pei, Xiao Xinjian, Tian Zeman
Published in: Mineral Deposit Research: Meeting the Global Challenge
Publisher: Springer Berlin Heidelberg
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The Hongtoushan volcanic-exhalative massive sulphide Cu-Zn-Au-Ag deposit of Liaoning Province occurs in an Archaean greenstone belt of the North China craton. Ores and the confining strata were metamorphosed to upper amphibolite facies and underwent three phases of deformation in the period between 2.8 and 2.5 Ga. There are more than 30 oreshoots that occur inside the main massive sulphide orebodies. These oreshoots range from 2 m to 30 m in length, 0.1 m to 1.5 m in width and 2 to 30 m in depth extension. Studies on composition and fabrics indicate that these oreshoots were actually local ore mylonite zones, which were overprinted by hydrothermal fluids during retrograde metamorphism from amphibolite to greenshcist facies.