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| 北武夷生米坑铅锌矿床地质地球化学特征与成因探讨 | |
| 引用本文： | 罗平,吴淦国,张达,狄永军,王长明,王永庆.北武夷生米坑铅锌矿床地质地球化学特征与成因探讨[J].地质力学学报,2009,15(4):349-362. |
| 作者姓名： | 罗平 吴淦国 张达 狄永军 王长明 王永庆 |
| 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;中国地质大学岩石圈构造、深部过程及探测技术教育部重点实验室,北京,100083;江西省地质矿产开发局赣东北大队,江西,上饶,334000 2. 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;中国地质大学岩石圈构造、深部过程及探测技术教育部重点实验室,北京,100083 3. 江西省地质矿产开发局赣东北大队,江西,上饶,334000 |
| 基金项目： | 中国地质调查局地质调查项目 |
| 摘 要： | 生米坑铅锌矿床位于北武夷中生代火山岩带的黄岗山火山盆地内，已知铅锌矿体呈脉状产于侏罗系上统鹅湖岭组流纹质熔结凝灰岩的断裂内，或呈细脉——浸染状分布于钾质粗面斑岩内，发育钾长石化、绿泥石化、硅化等蚀变。地球化学特征显示矿区火山——侵入岩属于贫钠富钾的S型花岗岩，其ω（SiO2）值为62．42％～78．02％、ω（K2O＋Na2O）值为7．66％～9．13％、ω（K2O）／ω（Na2O）比值为1．18～2．62、里特曼指数艿为1．67～3．78；矿区岩石LREE／HREE比值平均为10．94×10^-6，属于轻稀土富集型；Eu普遍亏损，特别是熔结凝灰岩、黑云母花岗岩δEu〈0．31，表明经历了显著的斜长石的分离结晶作用；自早至晚主阶段岩浆活动稀土总量逐渐降低。从∑REE总量值、δEu值、地球化学参数及标准稀土元素配分模式图上看，生米坑铅锌矿化蚀变岩与钾质粗面斑岩具有密切的成因联系。钾质粗面斑岩锆石（SHRIMP）年龄138．3±1．4Ma，表明矿床形成于燕山期白垩纪早期，矿床成因类型属次火山热液型铅锌矿床。 |
| 关 键 词： | 铅锌矿 钾质粗面斑岩 地球化学 矿床成因 北武夷生米坑 |
| 收稿时间： | 2009/8/6 0:00:00 |
GEOCHEMISTRY AND GENESIS OF SHENGMIKENG LEAD-ZINC DEPOSIT IN NORTHERN WUYI, EASTERN CHINA |
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| LUO Ping,WU Gan-guo,ZHANG D,DI Yong-jun,WANG Chang-min and WANG Yong-qin.GEOCHEMISTRY AND GENESIS OF SHENGMIKENG LEAD-ZINC DEPOSIT IN NORTHERN WUYI, EASTERN CHINA[J].Journal of Geomechanics,2009,15(4):349-362. | |
| Authors: | LUO Ping WU Gan-guo ZHANG D DI Yong-jun WANG Chang-min and WANG Yong-qin |
| Institution: | LUO Ping~(1,2,3),WU Gan-guo~(1,2),ZHANG Da~(1,DI Yong-jun~(1,WANG Chang-min~3,WANG Yong-qin~3 (1.State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China,2.Key Laboratory of Lithosphere Structure,Deep Process and Detection Technology,Ministry of Education,3.Northeastern Jiangxi Geological Party,Bureau of Geology and Mineral Resources of Jiangxi Province,Shangrao 334000,Jiangxi,China) |
| Abstract: | The Shengmikeng vein-type lead-zinc deposit is located in Huanggangshan volcano-tectonic depression of the Mesozoic volcanic belt in Northern Wuyi. The ore featured by veinlets and disseminations is hosted both inside the fault zone in the upper Jurassic Ehuling ignimbrite and the potassic trachyte porphyry. Geochemical characteristics indicate S-type granites and volcanic rocks depleted in sodium and enriched in potassium, with 62.42% - 78.02% w （SiO2）, 7.66% - 9.13% w （K2O＋Na2O）, 1.18-2.62 w （K2O）/w （Na2O）, and Rittmann index δ of 1.67-3.78. They are enriched in LREE with an average LREE/HREE ratio of 10.94 × 10^-6 , and generally depleted Eu with an minimum δEu less than 0.31 especially in the ignimbrite and biotite granite, which have experienced a significant process of separation and crystallization of plagioclases. ∑REE at the main stage of the magmatic activity decreases with time. From the point of the ∑REE, δEu, geochemical parameters and standard REE distribution patterns, lead-zinc mineralization altered rocks in the Shengmikeng deposit have close genetic relationship with the potassic trachyte porphyry with SHRIMP zircon age of 138.3 ± 1.4 Ma. It is suggested that the deposit was formed in the early Cretaceous period during Yanshanian and is of sub-volcanic hydrothermal type. |
| Keywords: | Shengmikeng Lead-zinc deposit potassie trachyte porphyry geochemistry metallogenesis Northern Wuyi |
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