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[1]冯罡,万乐,刘正宏,等.内蒙古巴林右旗晚侏罗世巴彦琥硕花岗岩地球化学特征、锆石U-Pb年龄及Hf同位素组成[J].地球科学与环境学报,2015,37(06):33-46.
　FENG Gang,WAN Le,LIU Zheng-hong,et al.Geochemical Characteristics, Zircon U-Pb Age and Hf Isotopic Composition of Late Jurassic Bayanhushuo Granites in Balinyou Banner of Inner Mongolia[J].Journal of Earth Sciences and Environment,2015,37(06):33-46.
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内蒙古巴林右旗晚侏罗世巴彦琥硕花岗岩地球化学特征、锆石U-Pb年龄及Hf同位素组成(PDF)
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第37卷
期数:
2015年第06期
页码:
33-46
栏目:
基础地质与矿产地质
出版日期:
2015-11-15

文章信息/Info

Title:
Geochemical Characteristics, Zircon U-Pb Age and Hf Isotopic Composition of Late Jurassic Bayanhushuo Granites in Balinyou Banner of Inner Mongolia
文章编号:
1672-6561(2015)06-0033-14
作者:
冯罡; 万乐; 刘正宏; 白新会; 关庆彬; 李鹏川
1. 内蒙古第二水文地质工程地质勘察院，内蒙古 鄂尔多斯 017000；2. 吉林大学 地球科学学院，吉林 长春 130061
Author(s):
FENG Gang;  WAN Le;  LIU Zheng-hong;  BAI Xin-hui;  GUAN Qing-bin;  LI Peng-chuan
1. Inner Mongolia Second Hydrogeology Engineering Geological Prospecting Institute, Erdos 017000, Inner Mongolia, China; 2. School of Earth Sciences, Jilin University, Changchun 130061, Jilin, China
关键词:
花岗岩; 地球化学; 侏罗世; 锆石; U-Pb年龄; Hf同位素; 钙碱性系列; 内蒙古
Keywords:
granite;  geochemistry;  Jurassic;  zircon;  U-Pb age;  Hf isotope;  calc-alkaline series;  Inner Mongolia
分类号:
P588.12+1；P597+.3
DOI:
-
文献标志码:
A
摘要:
巴彦琥硕花岗岩采自内蒙古巴林右旗北部，其主要岩性为中细粒花岗岩、细粒二长花岗岩。通过地球化学、锆石U-Pb定年及Hf同位素分析研究，探讨巴彦琥硕花岗岩成因及其地质意义。锆石U-Pb年代学研究结果表明，巴彦琥硕花岗岩锆石U-Pb年龄为150 Ma，形成于晚侏罗世。岩石学和地球化学研究表明：SiO2质量分数不低于71.3%，Al2O3不低于12.15%，w(K2O)+w(Na2O)值为7.74%~8.29%，w(K2O)/w(Na2O)值为0.88~1.57，Sr质量分数为(61.7~197.5)×10-6，Y为(17.3~33.2)×10-6，w(Sr)/w(Y)值低，为1.77~3.56，巴彦琥硕花岗岩属低锶高钇型岩石；岩石轻、重稀土元素分馏明显，w(La)N/w(Yb)N值为3.06~10.89，显示出明显的Eu负异常。锆石Hf同位素分析显示εHf(t)值介于6.1~12.3之间，显示源区亏损的特征。考虑到侏罗世—白垩世期间太平洋板块对中国东部边缘的俯冲作用，巴林右旗北部晚侏罗世巴彦琥硕花岗岩的形成受太平洋板块俯冲作用影响，形成于挤压向伸展体制转换的过渡期。
Abstract:
Bayanhushuo granites are collected from the northern part of Balinyou banner, Inner Mongolia. The main lithology includes fine grained granite and fine grained monzonitic granite. Based on geochemistry, zircon U-Pb dating and Hf isotopic analysis, the genesis of Bayanhushuo granites and the geological significance were discussed. Zircon U-Pb dating indicates that the zircon age of Bayanhushuo granite is 150 Ma, forming in Late Jurassic. Petrological and geochemical results show that the mass fraction of SiO2 is not lower than 71.3%, Al2O3 is not lower than 12.15%, w(K2O)＋w(Na2O) is 7.74%-8.29%, w(K2O)/w(Na2O) is 0.88-1.57; the mass fraction of Sr is (61.7-197.5)×10-6, Y is (17.3-33.2)×10-6, w(Sr)/w(Y) is low with the value of 1.77-3.56; Bayanhushuo granite belongs to the rock with low Sr and high Y; the fractionation between LREE and HREE of the rock is significant, w(La)N/w(Yb)N is 3.06-10.89 with obvious negative Eu anomaly. The zircon Hf Isotopic analysis demonstrates that εHf(t) is 6.1-12.3, showing the magma originates from depleted source. Considering the subduction of Pacific Plate on the edge of the eastern China in Jurassic-Cretaceous, the formation of Late Jurassic Bayanhushuo granite in the northern of Balinyou banner, which is affected by the subduction of Pacific Plate, is in a tectonic transition setting from compression to extension.

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备注/Memo

备注/Memo:
收稿日期:2015-08-05
基金项目:国家自然科学基金项目(41340024);中国地质调查局地质大调查项目(1212011085252)
作者简介:冯罡(1972-),男,内蒙古察哈尔右翼前旗人,高级工程师,E-mail:1240972404@qq.com。
通讯作者:刘正宏(1960-),男,辽宁丹东人,教授,博士研究生导师,理学博士,E-mail:zhliu@jlu.edu.cn。
更新日期/Last Update: 2015-11-27