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A step metallogenetic model for gold deposits in the northwestern Shandong Peninsula, China

Science China Earth Sciences 2012年第6期55卷 940-948页

作者： SONG MingChun YI PiHou XU JunXiang CUI ShuXue SHEN Kun JIANG HongLi YUAN WenHua WANG HuaJiang Shandong Provincial Bureau of Geology and Mineral Resources Jinan 250013 China No. 6 Exploration Institute of Geology and Mineral Resources Zhaoyuan 265400 China Shandong Institute ＆ Laboratory of Geological Sciences Jinan 250013 China

Based on our study of the nature and variation of mineralization-controlling faults in their deep extension and the spatial distribution of gold orebodies in the northwestern Shandong Peninsula (NSP), here we propose that the gold deposits in the jiaojia gold belt are controlled by listric faults and the gold deposits in the NSP are controlled by extensional fault system. We also suggest that there is a multiple mineralization space in the deep part of the NSP gold belt. As steps or benches occur along the deep extention of the listric fault where its dipping angle changes from steep to gentle, a number of gold deposits are correspondingly distributed as a steplike pattern, which is named as a step metallogenetic model for gold deposits in the NSP. The gold deposits in Shandong Peninsula were formed in the Cretaceous when the crust in the region experienced extention and thinning following the strong collision between North China Plate and Yangtze Plate during the Triassic. Crust anataxis, fluid remobilization, and extention-detachement of the crust are the leading factors for the gold mineralization.

关键词： deep-seated gold deposit step metallogenetic model northwestern Shandong Peninsula jiaojia gold belt

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