[1]李中会,程招勋,李 凯,等.乌兰浩特地区早白垩世晚期花岗斑岩年代学、地球化学特征及其构造背景[J].华东地质,2020,41(03):229-236.[doi:10.16788/j.hddz.32-1865/P.2020.03.004]
 LI Zhong-hui,CHENG Zhao-xun,LI Kai,et al.Geochronological and geochemical characteristics of the late Early Cretaceous granitic porphyry in the Ulanhot area and its tectonic setting[J].East China Geology,2020,41(03):229-236.[doi:10.16788/j.hddz.32-1865/P.2020.03.004]
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乌兰浩特地区早白垩世晚期花岗斑岩年代学、地球化学特征及其构造背景()
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《华东地质》[ISSN:2096-1871/CN:32-1865/P]

卷:
41
期数:
2020年03期
页码:
229-236
栏目:
基础地质
出版日期:
2020-09-15

文章信息/Info

Title:
Geochronological and geochemical characteristics of the late Early Cretaceous granitic porphyry in the Ulanhot area and its tectonic setting
文章编号:
2096-1871(2020)03-229-08
作者:
李中会程招勋李 凯王立佳
(黑龙江省地质调查研究总院,哈尔滨 150036)
Author(s):
LI Zhong-hui CHENG Zhao-xunLI KaiWANG Li-jia
(Heilongjiang Institute of Geological Survey, Harbin 150036,China)
Keywords:
Key words:granitic porphyry zircon U-Pb dating Late Early Cretaceous Nenjiang-Balihan fault
分类号:
P588.13
DOI:
10.16788/j.hddz.32-1865/P.2020.03.004
文献标志码:
A
Abstract:
Abstract:Two granitic porphyry belts outcropped in the Ulanhot area, Inner Mongolia, occur mainly in the sinistral strike-slip shear zone related to the Nenjiang-Balihan fault. LA-ICP-MS zircon U-Pb dating shows that granitic porphyry formed at 124.99±0.99 Ma, which belongs to the late Early Cretaceous. Geochemical characteristics show that the granitic porphyry has SiO2content of 70.56%~78.34% and(Na2O+K2O)content of 7.10%~8.99%, with A/CNK ratio of 0.94~1.20, and enrichment in Si and alkaline suggests that it belongs to subluminous-peraluminous granite. Granitic porphyry is characterized by medium REE contents, distinct fractionation of LREE and HREE((La/Yb)N=9.49~14.71), strong negative Eu anomaly(δEu=0.33~0.73), relative enrichment of large ion lithophile elements(Rb and Ba)and of high field strength-elements(Th and U), but relative depletion of Sr, Nb and Ti, with distinct negative anomaly, suggesting that it belongs to highly fractionated I-type granite. It can be concluded in this study that the Nenjiang-Balihan fault in the Ulanhot area experienced a short-period extension in the late Early Cretaceous.

备注/Memo

备注/Memo:
*收稿日期:2019-05-06 修订日期:2019-10-08 责任编辑:叶海敏
基金项目:中国地质调查局“前公主陵、东图门扎拉格、四方山、科尔沁右翼前旗、呼和马场、模范屯幅区域地质调查(编号: DD20160048-10)”项目资助。
第一作者简介:李中会,1965年生,男,高级工程师,主要从事区域地质调查及矿产地质勘查工作。
更新日期/Last Update: 2020-09-09