| 长江中下游成矿带陆内斑岩型矿床的成岩成矿作用 |
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| 引用本文： | 周涛发,王世伟,袁峰,范裕,张达玉,常印佛,Noel C WHITE.长江中下游成矿带陆内斑岩型矿床的成岩成矿作用[J].岩石学报,2016,32(2):271-288. |
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| 作者姓名： | 周涛发 王世伟 袁峰 范裕 张达玉 常印佛 Noel C WHITE |
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| 作者单位： | 合肥工业大学资源与环境工程学院, 合肥 230009,合肥工业大学资源与环境工程学院, 合肥 230009,合肥工业大学资源与环境工程学院, 合肥 230009,合肥工业大学资源与环境工程学院, 合肥 230009,合肥工业大学资源与环境工程学院, 合肥 230009,合肥工业大学资源与环境工程学院, 合肥 230009,合肥工业大学资源与环境工程学院, 合肥 230009 |
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| 基金项目： | 本文受国家自然科学基金项目(41320104003、41172086、41172084、40830426)、中国地质调查局地质调查工作项目(1212011121115、1212011220243、12120114039701)、国家"深部探测技术与实验研究专项计划"专题(SinoProbe-03-02-05)和安徽省公益性地质工作项目(2011-20)联合资助. |
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| 摘 要： | 陆内环境斑岩型矿床的发现对斑岩成矿理论的完善具有重要意义。长江中下游成矿带作为中国东部重要的陆内成矿带之一,成矿带内发育多个重要的斑岩型矿床,如铜山口Cu-Mo矿床、鸡冠嘴Cu-Au矿床、白云山Cu矿、城门山Cu-Mo矿床、武山Cu-Mo矿床、丰山洞Cu-Au矿床、丁家山Cu矿、洋鸡山Au矿、沙溪Cu-Au矿床、冬瓜山Cu-Au矿床、舒家店Cu矿床和安基山Cu矿床等。本文选取成矿带内典型的、具有代表性的斑岩型矿床,对其地质特征(地层、构造、含矿斑岩、脉体特征和围岩蚀变)、成岩成矿年代、成矿岩体的岩石化学和成岩成矿地球化学等方面的研究资料和成果进行了系统总结,讨论和试图阐明长江中下游成矿带陆内斑岩型矿床的成岩成矿作用与成矿模式。研究显示,长江中下游成矿带形成于燕山期陆内造山过程,成矿斑岩岩浆活动和成矿作用主要发生于149~105Ma之间,进一步可以分为早、中、晚三阶段:149~135Ma、133~125Ma和123~105Ma,三阶段岩浆活动和成矿作用主要发生于成矿带中的断隆区,早阶段(149~135Ma)和晚阶段(123~105Ma)多为斑岩-矽卡岩型矿化,中阶段(133~125Ma)矿化为典型的斑岩型矿化。长江中下游成矿带内斑岩型矿床的含矿斑岩为高钾钙碱性-钙碱性系列岩石,大部分具有埃达克岩的地球化学特征,可能为源自富集地幔的岩浆和加厚下地壳部分熔融的岩浆混合的产物,源自富集地幔的基性岩浆对成矿具有至关重要的作用,它的混入使得混合岩浆富水、硫和金属(Cu、Au)等。进一步通过与岩浆弧环境的斑岩型矿床对比研究发现,长江中下游成矿带斑岩型矿床一般不发育高级泥化岩帽(advanced argillic liithocaps)以及浅部的高-中硫矿化蚀变系统,含矿岩浆源区性质和成矿物质来源等与岩浆弧环境的斑岩型矿床明显不同。
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| 关 键 词： | 斑岩(-矽卡岩)型矿床 成岩成矿作用 成岩成矿模式 长江中下游成矿带 陆内环境 |
| 收稿时间： | 2014/10/30 0:00:00 |
| 修稿时间： | 2015/3/27 0:00:00 |
Magmatism and related mineralization of the intracontinental porphyry deposits in the Middle-Lower Yangtze River Valley Metallogenic Belt |
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| ZHOU TaoF,WANG ShiWei,YUAN Feng,FAN Yu,ZHANG DaYu,CHANG YinFo and Noel C WHITE.Magmatism and related mineralization of the intracontinental porphyry deposits in the Middle-Lower Yangtze River Valley Metallogenic Belt[J].Acta Petrologica Sinica,2016,32(2):271-288. |
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| Authors: | ZHOU TaoF WANG ShiWei YUAN Feng FAN Yu ZHANG DaYu CHANG YinFo and Noel C WHITE |
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| Institution: | School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China,School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China,School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China,School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China,School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China,School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China and School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China |
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| Abstract: | 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:149~135Ma, 133~125Ma and 123~105Ma 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. |
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| Keywords: | Porphyry(-skarn) deposits Magmatism and mineralization Ore model Middle-Lower Yangtze River Valley Metallogenic Belt(MLYB) Intracontinental setting |
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