河南鱼池岭钼矿床辉钼矿铼-锇同位素年龄及地质意义

李诺; 陈衍景; 孙亚莉; 胡海珠; 李晶; 张辉; 倪智勇

河南鱼池岭钼矿床辉钼矿铼-锇同位素年龄及地质意义

- 1.
  北京大学造山带与地壳演化教育部重点实验室，北京 100871
- 2.
  北京大学造山带与地壳演化教育部重点实验室，北京 100871；中国科学院广州地球化学研究所成矿动力学重点实验室，广州 510640
- 3.
  中国科学院广州地球化学研究所同位素年代学和地球化学重点实验室，广州 510640
- 4.
  河南省有色金属地质勘查总院，郑州 450052
- 5.
  中国科学院广州地球化学研究所成矿动力学重点实验室，广州 510640
- 6.
  中国科学院地球化学研究所，贵阳 550002
基金项目:
国家973项目(2006CB403500)和国家自然科学基金项目（40730421，40352003和40425006）以及中国科学院百人计划项目

收稿日期: 2008-10-05

修回日期: 2008-11-24

刊出日期: 2009-02-28

Molybdenite Re-Os isochron age of the Yuchiling porphyry Mo deposit, Henan Province and its geological implications

- 1.
  Key Laboratory of Orogen and Crust Evolution, Peking University, Beijing 100871, China
- 2.
  Key Laboratory of Orogen and Crust Evolution, Peking University, Beijing 100871, China; Key Laboratory of Metallogenic Dynamics, Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, China
- 3.
  Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, China
- 4.
  Institute of Geology for Nonferrous Metals of Henan Province, Zhengzhou 450052, China
- 5.
  Key Laboratory of Metallogenic Dynamics, Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, China
- 6.
  Guiyang Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China

Received Date: 05 October 2008

Revised Date: 24 November 2008

Publish Date: 28 February 2009

摘要

摘要: 河南嵩县鱼池岭钼矿床是东秦岭钼矿带新发现的大型斑岩钼矿床，产于被前人认为白垩纪的合峪花岗岩基内部。鱼池岭矿床5件辉钼矿样品的铼锇同位素模式年龄介于(134.3±2.0)~(141.8±1.6)Ma 之间，铼锇等时线年龄为144.3±5.2Ma（1σ，MSWD=3.7）。据此，结合前人获得的年龄资料，确定合峪复式花岗岩基的岩浆侵入序列为：(1) 144Ma之前的似斑状黑云母二长花岗岩，(2) 144Ma左右的黑云母二长花岗斑岩，(3) 136~127Ma左右的巨斑状黑云母二长花岗斑岩，(4) <127Ma的(石英)正长斑岩脉或岩株；合峪复式花岗岩基形成于晚侏罗世—早白垩世，而非前人认为的仅限于白垩纪；成岩成矿构造背景为碰撞加厚的造山带地壳和岩石圈的伸展减薄或减压增温体制，岩浆侵入和成矿作用与地壳快速隆升事件相伴随。
- 铼锇同位素年龄 /
- 陆陆碰撞 /
- 鱼池岭斑岩钼矿床 /
- 合峪复式花岗岩基 /
- 东秦岭
Abstract: The Yuchiling Mo deposit, Songxian County, Henan Province, is a large porphyry deposit recently discovered in the famous East Qinling Mo belt. It locates in the Heyu granite multistage batholith which has been believed to have developed in Cretaceous in previous studies. Five molybdenite samples from the Yuchiling deposit yield Re-Os isotopic model ages of 134.3±2.0 to 141.8±1.6 Ma, and an isochron age of 144.3±5.2Ma (1σ, MSWD=3.7). This age, combined with other isotopic data reported in previous studies, define the intrusive sequence of Heyu multistage batholith as following: (1) before 144Ma, formation of porphyritic biotite-monzogranite; (2) at ca. 144Ma, development of the biotite-monzogranite porphyry; (3) at ca. 136~127Ma, emplacement of mega-phenocrystic biotite-monzogranite; (4) after 127Ma, intruding of (quartz) syenite stocks or dykes. The Heyu granite batholith was formed in the period of Late Jurassic-Early Cretaceous, instead of previously suggested Cretaceous only. The Yuchiling Mo ore-system and the Heyu granite batholith were formed under a decompression geothermal increasing or crustal extension-thinning regime of formerly thickened orogenic crust and lithosphere. Formation of the ore-system and the Heyu batholith was coeval with a rapid crust-uplift event.
- Re-Os isotope age /
- Intercontinental collision /
- Yuchiling porphyry Mo deposit /
- Heyu multistage granite batholith /
- East Qinling Orogen

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河南鱼池岭钼矿床辉钼矿铼-锇同位素年龄及地质意义

Molybdenite Re-Os isochron age of the Yuchiling porphyry Mo deposit, Henan Province and its geological implications

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