Magmatism and related mineralizationof the intracontinental porphyry deposits in the Middle-Lower Yangtze River Valley Metallogenic Belt
Magmatism and related mineralizationof the intracontinental porphyry deposits in the Middle-Lower Yangtze River Valley Metallogenic Belt
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发表时间：
2016
影响因子：
1.8
通讯作者：
Zhou Tao-fa;Wang Shiwei;Yuan Feng;F. Yu;Zhang Dayu;Chang Yinfo;N. White
中科院分区：
文献类型：
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作者：
Zhou Tao-fa;Wang Shiwei;Yuan Feng;F. Yu;Zhang Dayu;Chang Yinfo;N. White
长江中下游成矿带是我国东部重要的成矿带之一。它包含许多重要的斑岩矿床（如。例如，在一个实施例中，铜山口铜钼、鸡冠嘴铜Au、白云山铜、城门山铜钼、巫山铜钼、凤山洞铜Au、丁家山铜、杨鸡山Au、沙溪铜Au、冬瓜山铜Au、舒家店铜、安吉山铜矿床）。本文总结了该带典型斑岩矿床的地质特征，包括地层、构造、含矿斑岩类型、脉体类型及围岩蚀变、年代学和地球化学等，并提出了新的成矿模式。通过详细的野外调查和文献资料的综合分析，认为本区斑岩型矿床的岩浆活动和成矿作用主要发生在晚侏罗世-早白垩世（约1000年）。149 ~ 105 Ma），可分为149 ~ 135 Ma、133 ~ 125 Ma和123 ~ 105 Ma三个阶段，分布于隆起带。早期（CA）149 ~ 135 Ma）和晚期（约. 123 ~ 105 Ma）阶段发育矽卡岩成矿作用，而中期（约123 ~ 105 Ma）阶段发育矽卡岩成矿作用。133 ~ 125 Ma）阶段则没有。含矿斑岩属高钾钙碱性/钙碱性系列，具有埃达克质地球化学特征，可能来源于富集的幔源岩浆与增厚的下地壳部分熔融产物的混合。富集的幔源基性岩浆组分通过提供充足的流体、硫（S）和金属（E），在成矿过程中发挥了重要作用。例如，在一个实施例中，Cu和Au）。与北美、智利等地岩浆弧环境下发育的典型斑岩矿床相比，岩浆源区和成矿元素来源也有很大差异。
The Middle-Lower Yangtze River Valley Metallogenic Belt( MLYB) is one of the most important metallogenic belts in eastern China. It contains many important porphyry deposits( e. g., Tongshankou Cu-Mo, Jiguanzui Cu-Au, Baiyunshan Cu,Chengmenshan Cu-Mo,Wushan Cu-Mo,Fengshandong Cu-Au,Dingjiashan Cu,Yangjishan Au,Shaxi Cu-Au,Dongguashan Cu-Au,Shujiadian Cu and Anjishan Cu deposits). In this paper,we summarize the geological characteristics including the stratigraphy,structure,ore-bearing porphyry types,vein types and wall rock alteration,geochronology and geochemistry of the typical porphyry deposits in the MLYB and present a new metallogenic model. Through detailed field investigations and a review of published data,we conclude that the magmatism and mineralization of porphyry deposits in the MLYB mainly occurred in the Late Jurassic to Early Cretaceous( ca. 149 ~ 105Ma),which can be divided into three stages: 149 ~ 135 Ma,133 ~ 125 Ma and 123 ~ 105 Ma and distributed in uplift zones. The Early( ca. 149 ~ 135Ma) and Late( ca. 123 ~ 105Ma) stages developed skarn mineralization,whereas the Middle( ca. 133 ~ 125Ma) stage did not. Ore-bearing porphyries belong to the high-K calc-alkaline / calc-alkaline series,with adakitic geochemical signatures,which probably originated from the mixing of an enriched mantle-derived magma and the partial melting products of the thickened lower crust. The enriched mantle-derived mafic magma component played an important role in the prophyry mineralization by supplying sufficient fluids,sulfur( S) and metals( e. g.,Cu and Au). Compared with typical porphyry deposits developed in magmatic arc settings in North America,Chile,etc.,porphyry deposits in the MLYB do not contain advanced argillic lithocaps or high-to intermediate-sulfidation systems,and the origin of the magma and the sources of ore-forming elements are also very different.