文献类型：期刊文献

中文题名：Jurassic granitoid dike in Luodian, Guizhou Province: discovery and geological significance

英文题名：Jurassic granitoid dike in Luodian, Guizhou Province: discovery and geological significance

作者：Mingjin Zhu Aiguo Nie Yazhou Tian Xinsong Wang Jun Sun

第一作者：Mingjin Zhu

机构：[1]Guizhou University;[2]Guizhou Institute of Technology;[3]State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences

第一机构：Guizhou University

年份：2019

卷号：38

期号：1

起止页码：159-172

中文期刊名：地球化学学报（英文）

收录：Scopus;CSCD:【CSCD2019_2020】；

基金：funded by grants from the National Natural Science Foundation of China (No.41262005);high-level personnel of Guizhou Institute of Technology (No. XJGC20140702);Talent introduction project of Guizhou University (No. 702400163301)

语种：英文

中文关键词：Jurassic;granitoid;dike;Geochemical;characteristics;Geochronology;Luodian;Guizhou;province

外文关键词：Jurassic granitoid dike;Geochemical characteristics;Geochronology;Luodian;Guizhou province

摘要：In this paper, the Jurassic granitoid dike that intrudes into Permian diabase was reported in Luokun,Luodian County, south Guizhou. Zircon LA-ICP-MS U–Pb dating of the granitoid dike yielded an age of 164.3 ± 2.4 Ma with the e Hf(t) range from + 7.8 to + 12.1. The high contents of SiO_2(65.2%–66.8%) and total alkali(Na_2O + K_2O: 9.01%–9.95%), and low contents of Mg, Fe, Ca, P and Ti show the characteristics of alkali-rich granite. The total contents of rare earth elements range from 289.90 to 394.23 ppm. The Rb, Ba, K, Th, U and other LILE, Ta, Sr, P, Ti are enriched, and heavy rare earth elements are depleted. Petrogeochemical characteristics show that the dike was derived from a partial melting of newly-grown basaltic crust, and contaminated by crustal materials before experiencing strong fractional crystallization. The dike was formed in the intraplate post-orogenic extension stage and indicates that parental magma rose to the shallow crust through a fault. This provides new evidence of tectonic and mantle-crust magmatic activities and may contribute to regional Au mineralization in southern Guizhou and neighboring areas.
In this paper, the Jurassic granitoid dike that intrudes into Permian diabase was reported in Luokun,Luodian County, south Guizhou. Zircon LA-ICP-MS U–Pb dating of the granitoid dike yielded an age of 164.3 ± 2.4 Ma with the e Hf(t) range from + 7.8 to + 12.1. The high contents of SiO_2(65.2%–66.8%) and total alkali(Na_2O + K_2O: 9.01%–9.95%), and low contents of Mg, Fe, Ca, P and Ti show the characteristics of alkali-rich granite. The total contents of rare earth elements range from 289.90 to 394.23 ppm. The Rb, Ba, K, Th, U and other LILE, Ta, Sr, P, Ti are enriched, and heavy rare earth elements are depleted. Petrogeochemical characteristics show that the dike was derived from a partial melting of newly-grown basaltic crust, and contaminated by crustal materials before experiencing strong fractional crystallization. The dike was formed in the intraplate post-orogenic extension stage and indicates that parental magma rose to the shallow crust through a fault. This provides new evidence of tectonic and mantle-crust magmatic activities and may contribute to regional Au mineralization in southern Guizhou and neighboring areas.