念青唐古拉弧背断隆东段始新世花岗岩类成矿意义

金属矿山 ›› 2011, Vol. 40 ›› Issue (07): 110-113+138.

念青唐古拉弧背断隆东段始新世花岗岩类成矿意义

雷传扬，汪雄武，张俊成，苟正彬，朱斯豹

成都理工大学地球科学学院

出版日期:2011-07-08 发布日期:2011-07-11
基金资助:
中央级公益性行业科研专项（编号：200911007-02），国土资源地质大调查项目(编号：1212010733803)，国土资源部全国矿产资源潜力评价项目(编号：1212010813025)，教育部岩石学矿床学国家重点(培育)学科建设项目（编号：SZD0407）。

Metallogenic Significance of Eocene Granites from the East Sag-uplift of Nyainqenanglha Arc-back

Lei Chuanyang，Wang Xiongwu，Zhang Juncheng，Gou Zhengbin，Zhu Sibao

College of Earth Science，Chengdu University of Technology

Online:2011-07-08 Published:2011-07-11

摘要/Abstract

摘要： 通过对念青唐古拉弧背断隆东段始新世花岗岩类进行岩石学特征研究及全岩地球化学分析，结果表明该套花岗岩类稀土配分模式呈以Eu为界左陡右缓的右倾式特征；花岗岩类形成于碰撞晚期短暂应力松弛、伸展的构造环境，由俯冲消减过程中幔源物质和壳源物质的同熔作用及增厚地壳的硅铝质部分熔融形成，此外俯冲板片上部的深海沉积物也参与了岩浆的形成；围岩是中酸性火山碎屑岩和含粉砂板岩、砂岩、灰岩，大小构造发育，有利于形成与斑岩有关的浅成低温热液矿床、斑岩型矿床及矽卡岩型矿床。

关键词: 念青唐古拉弧背断隆东段, 始新世, 花岗岩类, 成矿意义

Abstract: The petrological characteristics of Eocene Granites from the East Sag-uplift of Nyainqenanglha Arc-back study and the whole-rock geochemical analysis on Granitoid rocks showed that the REE patterns of granite presents right decline with Eu as a boundary of left-steep and right-slow style.Granitoid was formed in late stage of collision under tectonic environment of short stress relaxation and stretching.It is generated by the syntexis of the mantle and crustal material during subduction process，and the partial melting of the thickened crust salic.Besides，the deep-sea sediments in upper part of subducted slab also participated in the formation of the magma.Wall rocks consist of the acidic-intermediate volcanic rocks and silty slate stones，sandstone，and limestone.Its structure and growth are in favor of forming the epithermal deposit related porphyry deposit，porphyry-type deposits and skarn deposits.

Key words: East sag-uplift of , Nyainqenanglha arc- back, Eocene, Granide, Metallogenic significance

雷传扬, 汪雄武, 张俊成, 苟正彬, 朱斯豹. 念青唐古拉弧背断隆东段始新世花岗岩类成矿意义[J]. 金属矿山, 2011, 40(07): 110-113+138.

LEI Chuan-Yang, WANG Xiong-Wu, ZHANG Jun-Cheng, GOU Zheng-Bin, ZHU Si-Bao. Metallogenic Significance of Eocene Granites from the East Sag-uplift of Nyainqenanglha Arc-back[J]. Metal Mine, 2011, 40(07): 110-113+138.