| 西秦岭凤太矿集区铅锌矿床硅钙面控矿作用——以铅硐山铅锌矿床为例 |
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| 引用本文： | 石永红,王永,陈柏林,谭人文,高允,申景辉.西秦岭凤太矿集区铅锌矿床硅钙面控矿作用——以铅硐山铅锌矿床为例[J].中国地质,2022,49(1):226-240. |
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| 作者姓名： | 石永红 王永 陈柏林 谭人文 高允 申景辉 |
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| 作者单位： | 1. 中国地质科学院地质力学研究所动力成岩成矿实验室;2. 中国地质大学(北京);3. 中国地质大学(武汉) |
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| 基金项目： | 中国地质调查局地质调查项目（DD20160053）、中国地质调查局中央级公益性科研院所基本科研业务费（JYYWF20183702、JYYWF20180602）联合资助。 |
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| 摘 要： | 【研究目的】西秦岭凤太矿集区是秦岭铅锌金多金属成矿带重要组成部分，但对矿集区铅锌矿的矿床类型和控矿因素一直存在争议。【研究方法】通过对凤太矿集区内具有代表性的铅硐山铅锌矿进行详细的野外调查和资料梳理，论述了该矿床的硅钙面控矿特征。【研究结果】认为作为凤太盆地铅锌矿底板的古道岭组灰岩，为偏碱性的Ca质岩石，顶板星红铺组千枚岩为Si质的岩石，形成了一个完美的Si/Ca界面。地层中初始富集的成矿物质在三叠纪岩浆热液作用下再次富集，并沿盆地内NWW向的一系列褶皱构造及同生断裂运移，在大型褶皱转折端、层间滑脱带等部位的Si/Ca界面聚集成矿。【结论】据此认为区域上复式背斜转折端附近和其翼部的层间滑脱带、复式背斜的鞍部、层间滑脱带是成矿的有利部位。同时西秦岭印支期铅锌矿成矿作用与大规模的构造-岩浆活动在空间和时间上相耦合，矿集区内铅锌矿床类型为与岩浆活动有关的热液矿床。
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| 关 键 词： | 铅锌矿床 硅钙面 热液矿床 矿产勘查工程 凤太矿集区 西秦岭 |
| 收稿时间： | 2019/10/17 0:00:00 |
| 修稿时间： | 2019/12/25 0:00:00 |
Characteristics of silicon-calcium surface ore-controlling in Fengtai ore-concentration areas,West Qinling Mountains:Examples from Qiandongshan Pb-Zn deposit |
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| SHI Yonghong,WANG Yong,CHEN Bailin,TAN Renwen,GAO Yun,SHEN Jinghui.Characteristics of silicon-calcium surface ore-controlling in Fengtai ore-concentration areas,West Qinling Mountains:Examples from Qiandongshan Pb-Zn deposit[J].Chinese Geology,2022,49(1):226-240. |
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| Authors: | SHI Yonghong WANG Yong CHEN Bailin TAN Renwen GAO Yun SHEN Jinghui |
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| Institution: | Laboratory of Dynamic Digenesis and Metallogenesis, Institute of Geomechanics, CAGS, Beijing 100081, China;China University of Geoscience (Beijing), Beijing 100083, China;Laboratory of Dynamic Digenesis and Metallogenesis, Institute of Geomechanics, CAGS, Beijing 100081, China;China University of Geoscience (Wuhan), Wuhan 430074, Hubei, China |
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| Abstract: | This paper is the result of mineral exploration engineering.Objective]The Fengtai ore-concentration area in the Western Qinling is an important part of the Qinling lead-zinc-gold polymetallic metallogenic belt. However, there has been a long running controversial debate about the type and ore-controlling factors of the lead-zinc ore-concentration area. Methods]Based on the detailed field investigation and data combing of the representative Qiandongshan lead-zinc deposit in the Fengtai ore-concentration Area, the ore-controlling characteristics of the silicon-calcium surface of the deposit are discussed. Results]It is considered that the bottom plate of the c in the Fengtai Basin is the limestone of the Gudaoling Formation, which is analkaline calcareous rock, and the top plate is the phyllite of the Xinghongpu Formation, which is a siliceous rock. They form a perfect Si/Ca interface. The initially enriched ore-forming materials in the stratumwere enriched again under the action of the Triassic magmatic hydrothermal fluid, andmigrates along a series of NWW-strikefold structures and syngeneic faults in the basin, therefore, they concentrate to form deposits at the Si/Ca interfaceof the turning end of large folds, interlayer slip zone, etc. Conclusions]Based on this, it is considered that the interlayer slip zone near the turning end of the compound anticline and its wings, the saddle portion of the interticle, and the interlayer slip zone in the area are favorable areas for mineralization.At the same time, the metallogenesis of the Indosinian lead-zinc deposit in the Western Qinling was coupled with large-scale tectonic-magmatic activities in space and time. And the types of lead-zinc deposits in the ore-concentrated area are hydrothermal deposits related to magmatic activities.Highlights: The ore-controlling characteristics of the Fengtai ore-concentration area is controversial over the years. Taking typical deposits as an example, the ore-controlling characteristics of lead-zinc deposits in the area expound in detail by using the theory of silicon-calcium surface mineralization and taking typical deposits as an example. |
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| Keywords: | lead-zinc deposit Si/Ca interface hydrothermal deposit mineral exploration engineering Fengtai ore-concentration area Western Qinling |
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