[1]罗春林,刘高峰,左祖发.赣南坪市花岗岩体LA-ICP-MS锆石U-Pb年龄、地球化学特征及构造意义[J].华东地质,2016,37(02):79-88.[doi:10.16788/j.hddz.32-1865/P.2016.02.001]
　LUO Chun-lin,LIU Gao-feng,ZUO Zu-fa.LA-ICP-MS zircon U-Pb ages and geochemical characteristics of the Pingshi granitic pluton in southern Jiangxi and their tectonic significance[J].East China Geology,2016,37(02):79-88.[doi:10.16788/j.hddz.32-1865/P.2016.02.001]
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赣南坪市花岗岩体LA-ICP-MS锆石U-Pb年龄、地球化学特征及构造意义
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《华东地质》[ISSN:2096-1871/CN:32-1865/P]

卷:
37
期数:
2016年02期
页码:
79-88
栏目:
基础地质
出版日期:
2016-06-15

文章信息/Info

Title:
LA-ICP-MS zircon U-Pb ages and geochemical characteristics of the Pingshi granitic pluton in southern Jiangxi and their tectonic significance
文章编号:
2096-1871(2016)02-079-10
作者:
罗春林; 刘高峰; 左祖发
江西省地质调查研究院,南昌 330030
Author(s):
LUO Chun-lin;  LIU Gao-feng;  ZUO Zu-fa
(Geological Survey of Jiangxi Province,Nanchang 330030, China)
关键词:
地球化学;  锆石U-Pb定年;  S型花岗岩;  坪市花岗岩体;  加里东运动;  华南陆内造山;  赣南
Keywords:
geochemistry;  zircon U-Pb dating;  S-type granite;  Pingshi granitic pluton;  Caledonian movement;  intracontinental orogeny in South China;  SouthernJiangxi
分类号:
P588.12
DOI:
10.16788/j.hddz.32-1865/P.2016.02.001
文献标志码:
A
摘要:
本文对赣南横市地区坪市花岗岩体进行LA-ICP-MS锆石U-Pb定年、岩石学和地球化学研究。结果表明:锆石U-Pb年龄分别为456.1±3.8 Ma和441.3±5.2 Ma,表明坪市花岗岩体形成于晚奥陶世—早志留世。地球化学特征显示,坪市花岗岩体的铝饱和指数为1.1～1.29,K2O/Na2O为0.97～1.51,属强过铝质及高钾钙碱性岩石; 稀土元素总量为(113～250)×10-6,轻稀土元素富集,稀土配分模式呈明显的右倾型; δEu为0.38～0.67,Eu亏损中等偏高; 岩体Rb、Th+U、La+Ce、Nd、Zr+Hf+Sm相对富集,Ba、Nb、Sr、Ti相对亏损。岩体Rb/Sr为0.60～2.82,平均1.66,明显高于大陆地壳平均值和上地壳平均值,具壳源花岗岩特征。坪市花岗岩体形成于早古生代晚期的加里东构造运动,是华夏古陆块与扬子古陆块在新元古代碰撞拼贴之后发生裂解,在中奥陶世至志留纪上地壳部分熔融形成的S型花岗质岩浆,在碰撞至后碰撞过渡期上升至地壳浅部形成的花岗岩体。
Abstract:
This study conducted analysis on the Pingshi granitic pluton in the Hengshiarea, southern Jiangxi Province using LA-ICP-MS zircon U-Pb dating, petrologicaland geochemical methods. The results show that the zircon U-Pb ages of thebiotite monzogranite in the studied areas are 456.1±3.8 Ma and 441.3±5.2 Ma, indicating the Pingshi granitic pluton formed in Late Ordovician to Early Silurian. Geochemical result shows that the Pingshi granitic pluton has ACNK of 1.1～1.29 and K2O/Na2O of 0.97～1.51, suggesting that they belong to peraluminous and high-K calc-alkaline rock. The pluton has a total REE content of(113～250)×10-6, and is enriched in LREE, with distinct right oblique REE patterns, Eu valuesof 0.38 to 0.67 and obvious negative Eu anomaly. The REE analysis shows the pluton is enriched in Rb, Th+U, La+Ce, Nd and Zr+Hf+Sm, and depleted in Ba, Nb, Srand Ti, with Rb/Sr ratio of 0.60～2.82(averaging 1.66)obviously higher than the average values of continental crust and the upper crust, suggesting that the pluton is of the characteristics of crust derived granite. The Pingshi granite pluton might result from the Caledonian movement of late Early Paleozoic, and broke up after collision matching between Cathaysian block and Yangtze block. S-typegranitic magmas, formed by partial melting of the upper crust in the period ofMiddle Ordovician to Silurian, ascended to the shallow part of the crust and yielded the Pingshi granite pluton in the period of collision to post-collision.

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备注/Memo

备注/Memo:
基金项目:中国地质调查局地质调查项目“江西1:50000遂川县(G50E011003)、良口(G50E011004)、横市井(G50E012003)、夏府(G50E012004)幅区调”(项目编码:1212011120812)。
第一作者简介:罗春林,1967年生,男,高级工程师,主要从事岩石学、区域地质矿产调查及研究工作。
更新日期/Last Update: 2016-06-17