浙江常山里山岭斑岩型铜矿床成岩时代及岩浆源区

doi:10.13278/j.cnki.jjuese.201603111

吉林大学学报(地球科学版) ›› 2016, Vol. 46 ›› Issue (3): 736-748.doi: 10.13278/j.cnki.jjuese.201603111

浙江常山里山岭斑岩型铜矿床成岩时代及岩浆源区

王科强^1,2,3, 张德会^1,2, 朱玉娣⁴, 付芬^1,2, 印贤波⁵, 王晨昇⁶

1. 中国地质大学(北京)地球科学与资源学院, 北京 100083;
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;
3. 北京东方燕京矿山工程设计有限责任公司, 北京 100070;
4. 西南石油大学地球科学与技术学院, 成都 610500;
5. 西藏金龙矿业股份有限公司, 拉萨 850000;
6. 中国有色金属矿产地质调查中心, 北京 100012

收稿日期:2015-10-12 出版日期:2016-05-26 发布日期:2016-05-26
通讯作者: 张德会(1955-),男,教授,博士生导师,主要从事矿床地球化学和流体包裹体研究,E-mail:zhdehui@cugb.edu.cn E-mail:zhdehui@cugb.edu.cn
作者简介:王科强(1967-),男,博士研究生,主要从事矿床学、成矿区划和地球化学研究,E-mail:wkq32639832@sina.com
基金资助:
国土资源部项目（201411024）；国家自然科学基金项目（41373048）

Petrogenic Age and Magma Source of Granite Porphyry in Lishanling Porphyry Cu Deposit in Changshan Area, Zhejiang Province

Wang Keqiang^1,2,3, Zhang Dehui^1,2, Zhu Yudi⁴, Fu Fen^1,2, Yin Xianbo⁵, Wang Chensheng⁶

1. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China;
2. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;
3. Beijing Oriental Yanjing Mining Design Co., Ltd., Beijing 100070, China;
4. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
5. Tibet Jinlong Incorporated Co., Ltd., Lasa 850000, China;
6. China Non-Ferrous Metal Resource Geological Survey, Beijing 100012, China

Received:2015-10-12 Online:2016-05-26 Published:2016-05-26
Supported by:
Supported by the Ministry of Land and Resources(201411024) and National Natural Science Founda of China(41373048)

摘要/Abstract

摘要：

浙江是非金属矿大省，金属矿特别是斑岩型矿床的研究亟待进行。本文以里山岭斑岩型铜矿床为研究对象，首次采用SHRIMP U-Pb对该岩体侵位时代进行精确限定，利用Sr-Nd同位素示踪含矿岩体的岩浆源区，不仅为浙江斑岩型矿床成因的深入研究增加了新资料，还对浙西下一步找矿勘探具有重要意义。浙江常山里山岭斑岩型铜矿床位于钦杭成矿带东段，受球川-萧山深断裂带控制。该矿床铜矿化主要赋存于花岗斑岩体中。含矿花岗斑岩为高硅、富碱、高分异、过铝质S型花岗岩。岩体的稀土分布型式右倾，整体呈“海鸥型”，有明显负Eu异常。岩石亏损Sr、Ba等大离子亲石元素，富集Nb、Ta、Zr、Hf、Ti、Y、Yb等高场强元素。含矿花岗斑岩锆石SHRIMP U-Pb年龄为（131±2）Ma，为早白垩世构造-岩浆活动的产物，形成于中国东部岩石圈减薄背景。岩浆岩（⁸⁷Sr/⁸⁶Sr）_i值为0.679 95~0.721 08，平均0.701 14。ε_Nd（t）值为-8.4~-5.8，平均-6.7。Sr-Nd同位素特征表明含矿花岗斑岩源区主要为地壳，兼有少量地幔物质的混染。

关键词: 斑岩型铜矿, 花岗斑岩, Sr-Nd同位素, SHRIMP锆石U-Pb年龄, 浙江常山里山岭

Abstract:

Zhejiang is well known for its abundant non-metallic mineral resource, whereas is lack of research data on metallic deposits, especially on the porphyry deposits. The Lishanling porphyry Cu deposit has been chosen as a study object, the SHRIMP zircon U-Pb dating is applied to restrict the emplacement age of Lishanling granite porphyry. Sr-Nd isotope tracing is completed to study the origin of granite porphyry. The research result not only can enhance the study on ore genesis of porphyry deposits in Zhejiang, but also is vital important for further ore exploration in western Zhejiang. The Lishanling porphyry Cu deposit is located in the east of Qinzhou-Hangzhou suture zone, and the copper mineralization occurs within the granitic porphyry. The ore-bearing porphyry is classified as the S-type granite with high silica, alkaili content, strong fractionation, and peraluminous characteristics. In the chondrite-normalized diagram, the REE patterns lean to the right, appears as a seagulls, the enrichment of LREE and negative Eu anomalies are abvious. The porphyry is rich in Nb, Ta, Zr, Hf, Ti, Y, Yb; and depleted of LILEs such as Sr and Ba. Zircon SHRIMP U-Pb age of ore-bearing granite porphyry is (131±2) Ma, which proves that the porphyry was resulted from the Early Cretaceous tectonic-magmatic activity and formed in the tectonic background of lithospheric thinning in Eastern China. The ore-bearing porphyry has relative high value of I_Sr(0.679 95 to 0.721 08) and low ε_Nd(t) value (-8.4 to -5.8), with the average value of 0.701 14 and -6.7 respectively. The ore-bearing granite porphyry mainly origin from crustal rock with a small amount of mantle contamination, which can be proved by the Sr-Nd isotopic characteristics.

Key words: porphyry Cu deposit, granite porphyry, Sr-Nd isotopes, zircon SHRIMP U-Pb age, Lishanling in Changshan area of Zhejinag Province

中图分类号:

P597

王科强, 张德会, 朱玉娣, 付芬, 印贤波, 王晨昇. 浙江常山里山岭斑岩型铜矿床成岩时代及岩浆源区[J]. 吉林大学学报(地球科学版), 2016, 46(3): 736-748.

Wang Keqiang, Zhang Dehui, Zhu Yudi, Fu Fen, Yin Xianbo, Wang Chensheng. Petrogenic Age and Magma Source of Granite Porphyry in Lishanling Porphyry Cu Deposit in Changshan Area, Zhejiang Province[J]. Journal of Jilin University(Earth Science Edition), 2016, 46(3): 736-748.

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浙江常山里山岭斑岩型铜矿床成岩时代及岩浆源区

Petrogenic Age and Magma Source of Granite Porphyry in Lishanling Porphyry Cu Deposit in Changshan Area, Zhejiang Province

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