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| 东秦岭尚古寺斑岩钼矿地质特征及成矿潜力分析 | |
| 引用本文： | 杨宗锋.东秦岭尚古寺斑岩钼矿地质特征及成矿潜力分析[J].地质与勘探,2011,47(6):1077-1090. |
| 作者姓名： | 杨宗锋 |
| 作者单位： | 1. 中国地质大学地质过程与矿产资源国家重点实验室,北京,100083 2. 河南省国土资源科学研究院,河南郑州,450053 3. 中国地质科学院,北京,100037 |
| 基金项目： | 河南省地质矿产重大科技攻关计划项目(26417)资助 |
| 摘 要： | 尚古寺斑岩钼矿位于东秦岭，为东秦岭地区已知钼矿区的最东部端元。出露面积约1．5km^2，围岩主要为元古代片麻岩和碱流岩。辉钼矿化主要发育在花岗斑岩体的东部和南部区域，花岗斑岩顶部细粒花岗斑岩和其上覆花岗质伟晶岩均呈浸染状矿化，南部角岩发育裂隙矿化。花岗斑岩主体岩性主要矿物组合为石英、钾长石和斜长石，显示具有富硅、富碱和... |
| 关 键 词： | 东秦岭 尚古寺 斑岩钼矿 岩石结构构造 成岩成矿物理过程 |
| 收稿时间： | 2010/9/26 0:00:00 |
| 修稿时间： | 4/6/2011 12:00:00 AM |
Geological Characteristics and Prospecting Potential of the Shanggusi Porphyry Molybdenum Deposit in the East Qinling |
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| YANG Zong-Feng.Geological Characteristics and Prospecting Potential of the Shanggusi Porphyry Molybdenum Deposit in the East Qinling[J].Geology and Prospecting,2011,47(6):1077-1090. | |
| Authors: | YANG Zong-Feng |
| Institution: | State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing |
| Abstract: | Abstract:The Shanggusi porphyry molybdenum deposit is located in the easternmost part of all the known molybdenum deposits in the East Qinling with an outcrop area about 1.5km2. Disseminated molybdenite mineralization occurred in the marginal fine-grain porphyry granite and the periphery granitic pegmatite in the east and south part of the Shanggusi granite porphyry, and some fracture-filling molybdenite mineralization occurred in the hornstone of the southern Shanggusi granite porphyry as well. The main rock-forming mineral phase assemblage of the Shanggusi molybdenum-bearing granite porphyry contains quartz, alkaline feldspar and plagioclase, and the chemical compositions of the granite porphyry are characterized by enriched silicon and alkali, depleted iron and magnesium. The Shanggusi granite porphyry bears the typical high-temperature granular quartz, of which different extents of resorption have taken place with features of harbour-like, skeletal, and dendritic quartz. The dissolved quartz is filled with or included by alkaline feldspar and plagioclase, resulting from the fast disequilibrium crystallization after the high-temperature quartz-bearing granitic porphyry magma rapidly intruded at shallow levels. The spherical, ellipsoidal and plastic flow state of the mafic magmatic enclaves, and irregular, lamellar-shaped biotite-enriched regions in the porphyry body are compelling evidence for the magmatic mixing/ mingling. Fluids exsolution and transportation phenomenon are well preserved by some significant structures in the Shanggusi porphyry, including (but not limited to) the alteration miarolitic cavities, interconnected miarolitic cavities, cavities, the sulfide alteration prominence and the vertical snake-curved mica-enriched regions. The fine-grained granite porphyry and the granitic pegmatite, generated by the undercooled crystallization of the marginal porphyritic magma and rapid crystal growth of its front supersaturated melts respectively, by which the ore-forming fluids were trapped, resulted in the disseminated mineralization. The Shanggusi porphyry molybdenum deposit provides a coupled mineralization example of crust-derived magma and deep ore-bearing fluid, which correspond to the orthomagmatic subsystem and peri-pegmatite subsystem in the metallogenic system of transmagmatic fluid theory. Therefore, a large ore deposition may exist within the unexposed portion of the Shanggusi porphyry body. |
| Keywords: | East Qinling Shanggusi porphyry molybdenum deposit textures and structure physical processes of diagenesis and mineralization |
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