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安徽铜陵凤凰山石英二长闪长岩和花岗闪长岩锆石SHRIMP U-Pb年龄及其地质意义
引用本文:瞿泓滢,裴荣富,李进文,王永磊. 安徽铜陵凤凰山石英二长闪长岩和花岗闪长岩锆石SHRIMP U-Pb年龄及其地质意义[J]. 吉林大学学报(地球科学版), 2010, 40(3): 581-590. DOI: 10.3969/j.issn.1671-5888.2010.03.014
作者姓名:瞿泓滢  裴荣富  李进文  王永磊
作者单位:1.中国地质科学院 ,矿产资源研究所,北京 100037;2.中国地质科学院 ,研究生院,北京 100037;3.南京大学 ,内生金属矿床成矿机制研究国家重点实验室,南京 210093
基金项目:中国地质调查局危机矿山项目,南京大学内生金属矿床成矿机制研究国家重点实验室开放基金 
摘    要:为建立矿区内岩浆演化序列、探讨成岩成矿关系,选取凤凰山石英二长闪长岩和花岗闪长岩进行锆石SHRIMP U-Pb精确定年。石英二长闪长岩样品测年获得年龄数据为(136.0±2.0)~(143.0±2.4)Ma,加权平均值为(139.4±1.2)Ma(n=15,MSWD=0.76);花岗闪长岩样品测年获得年龄数据为(136.7±2.0)~(145.3±2.4)Ma,加权平均值为(141.0±1.1)Ma(n=17,MSWD=1.5)。岩体侵位年代为晚侏罗世、燕山晚期,与铜陵矿集区主要成矿岩体的形成时代一致。辉钼矿Re-Os等时线年龄与花岗闪长岩侵位年龄一致,老于石英二长闪长岩侵位年龄,说明花岗闪长岩为凤凰山矽卡岩型铜矿床的主成矿岩体,成岩成矿关系密切,它们为同期产物。同位素组成表明,幔源岩浆分异的深部流体参与了成矿作用。岩体侵位、岩石圈整体加厚产生的伸展作用和软流圈地幔、上覆地壳减压熔融产生玄武岩浆底侵作用有关。

关 键 词:锆石SHRIMP U-Pb年龄  石英二长闪长岩  花岗闪长岩  成岩成矿  凤凰山  铜陵  铜矿  
收稿时间:2009-12-17

SHRIMP U-Pb Dating of Zircon from the Fenghuangshan Quartz Monzodiorite and Granodiorite in Tongling Area, Anhui Province and Its Geological Implication
QU Hong-ying,PEI Rong-fu,LI Jin-wen,WANG Yong-lei. SHRIMP U-Pb Dating of Zircon from the Fenghuangshan Quartz Monzodiorite and Granodiorite in Tongling Area, Anhui Province and Its Geological Implication[J]. Journal of Jilin Unviersity:Earth Science Edition, 2010, 40(3): 581-590. DOI: 10.3969/j.issn.1671-5888.2010.03.014
Authors:QU Hong-ying  PEI Rong-fu  LI Jin-wen  WANG Yong-lei
Affiliation:1.Institute of Mineral Resources, China Academy of Geological Sciences, Beijing 100037, China;
2.Graduate School|Chinese Academy of Geological Sciences, Beijing 100037, China;
3.State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing |210093, China
Abstract:In order to study the magmatic evolution and relationship between magmatism and mineralization, the SHRIMP U-Pb dating of zircon in Fenghuangshan quartz monzodiorite and granodiorite in Tongling area, Anhui Province are carried out. The SHRIMP U-Pb age of zircon from the quartz monzodiorite changes from (136.0±2.0) to (143.0±2.4) Ma, and the weighted mean age is (139.4±1.2) Ma (n=15, MSWD=0.76). Results of SHRIMP U-Pb zircon dating of granodiorite is from (136.7±2.0) to (145.3±2.4) Ma, and the weighted mean age is (141.0±1.1) Ma (n=17, MSWD=1.5). The emplacing age of the Fenghuangshan intrusion is the Late Jurassic. Moreover, the molybdenite Re-Os isochrone age is accordant with that of the granodiorite and older than the age of quartz monzodiorite. The copper mineralization has the closer relationship with the granodiorite and they are formed contemporaneously. Isotopic data indicate that the mineralization is related to the deep fluids derived from mantle magma differentiation. The extensional process resulted from the whole lithosphere thickening and the basaltic magma approaching, caused by from the aesthenosphere mantle and upper crust decompression and melting, played an important role in forming of the Fenghuangshan intrusion.
Keywords:zircon SHRIMP dating  quartz monzodiorite  granodiorite  magmatism and mineralization  Fenghuangshan  Tongling  copper deposit  
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