[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()
《华东地质》[ISSN:2096-1871/CN:32-1865/P]
- 卷:
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41
- 期数:
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2020年03期
- 页码:
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229-236
- 栏目:
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基础地质
- 出版日期:
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2020-09-15
文章信息/Info
- Title:
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Geochronological and geochemical characteristics of the late Early Cretaceous granitic porphyry in the Ulanhot area and its tectonic setting
- 文章编号:
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2096-1871(2020)03-229-08
- 作者:
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李中会; 程招勋; 李 凯; 王立佳
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(黑龙江省地质调查研究总院,哈尔滨 150036)
- Author(s):
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LI Zhong-hui; CHENG Zhao-xun; LI Kai; WANG Li-jia
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(Heilongjiang Institute of Geological Survey, Harbin 150036,China)
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- Keywords:
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Key words:granitic porphyry; zircon U-Pb dating; Late Early Cretaceous; Nenjiang-Balihan fault
- 分类号:
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P588.13
- DOI:
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10.16788/j.hddz.32-1865/P.2020.03.004
- 文献标志码:
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A
- Abstract:
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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:
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*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