The ‘Jiaodong type’ gold deposits: Characteristics, origin and prospecting
The ‘Jiaodong type’ gold deposits: Characteristics, origin and prospecting
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DOI：
10.1016/j.oregeorev.2014.06.021
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发表时间：
2015-03
影响因子：
3.3
通讯作者：
Lin Li;Lin Li;Mamta Santosh;Mamta Santosh;Sheng‐Rong Li
中科院分区：
文献类型：
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作者：
Lin Li;Lin Li;Mamta Santosh;Mamta Santosh;Sheng‐Rong Li
胶东型金矿是一个独特的金矿化类型，包括玲珑型石英脉型和焦家型浸染型金矿。虽然该类型区位于中国东北的胶东半岛，那里有世界上最丰富的黄金储量，但我们在中国其他地区和世界其他地方也发现了类似的金矿。在控矿断裂高角度处，成矿流体向上运移，形成石英脉型金矿（玲珑型）。流体侵入围岩，在含矿流体遇到低角度裂隙的地方形成焦家式浸染型矿床。胶东型金矿化在区域上沿着于活化断裂边缘、断裂内部沿着于古缝合带或沿着于微块体结合部，其构造背景、成矿特征和成矿历史与经典造山型金矿有明显区别。与矽卡岩型和斑岩型金矿不同，胶东型金矿与岩浆侵入体的空间关系并不密切，有些矿床产于岩体的远端（> 10 km）。本文对胶东式金矿床的主要地质、年代学、地球化学和同位素特征进行了评价，并提出了找矿的一般性指导意见。根据实例研究，我们预测胶东型矿化带中的金矿脉可能垂向延伸至3000 m，矿物学和地球化学变化不大。
The Jiaodong type comprises a unique class of gold mineralisation which includes the Linglong type quartz-vein hosted and the Jiaojia type fracture-disseminated style deposits. Although the type area is in the Jiaodong Peninsula in NE China, where some of the world's richest gold reserves occur, we identify similar occurrences in other parts of China and elsewhere in the world under this category. The ore fluids migrated upwards forming quartz vein type of gold ore (Linglong type) wherever the ore-controlling fractures are at high angles. Fluid infiltration into the surrounding wall rocks and generation of the Jiaojia type disseminated style deposits resulted where the ore-bearing fluids encountered low angle fractures. On a regional scale, the Jiaodong type gold mineralisation occurs along the margins of reactivated cratons, within the interior of cratons along paleosuture zones, or along the junctions of micro-blocks, and is distinctly different from the classic orogenic gold in terms of their tectonic setting, ore characteristics and genetic history. Unlike skarn and porphyry type of deposits, the Jiaodong type gold deposits do not always show close spatial relationship with magmatic intrusives and some of the deposits occur distal to plutons (> 10 km). In this paper, we evaluate the salient geological, geochronological, geochemical and isotopic features of the Jiaodong type gold deposits and propose some general guidelines for gold prospecting. Based on case studies, we predict that the gold lodes in the Jiaodong type mineralised zones might extent vertically up to 3000 m with only minor mineralogical and geochemical variations.