息朝庄,杜高峰,戴雪灵,戴塔根,夏浩东.太行山南段矿山杂岩体LA-ICP-MS锆石U-Pb年代学、地球化学及其地质意义[J].地质找矿论丛,2021,36(3):308-317
太行山南段矿山杂岩体LA-ICP-MS锆石U-Pb年代学、地球化学及其地质意义
Geochemistry and chronology characteristics of Kuangshan complex in the southern Taihang Mountain and the geological significance
投稿时间:2021-03-16  修订日期:2021-06-23
DOI:10.6053/j.issn.1001-1412.2021.03.008
中文关键词:  矿山杂岩体  地球化学  年代学  太行山南段
英文关键词:Kuangshan complex  geochemistry  chronology  the South Taihangshan mountain
基金项目:国家自然科学基金(编号:41103024)、联合基金项目(编号:U1812402)、湖南省教育厅科学研究一般项目(编号:20C0381)联合资助。
作者单位E-mail
息朝庄 湖南城市学院土木工程学院, 湖南 益阳 413000  
杜高峰 东华理工大学, 数字国土江西省重点实验室, 南昌 330013  
戴雪灵 湖南黄金集团有限责任公司, 长沙 410083 38003981@qq.com 
戴塔根 有色金属成矿预测教育部重点实验室, 长沙 410083
中南大学地球科学与信息物理学院, 长沙 410083 
 
夏浩东 国土资源实物地质资料中心, 河北 燕郊 065201  
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中文摘要:
      太行山南段矿山杂岩体主要由闪长岩、石英闪长岩及二长闪长岩组成,LA-ICP-MS锆石U-Pb测年显示,闪长岩形成于125.2 Ma±1.4 Ma-126.9 Ma±1.3 Ma,说明该岩体形成于早白垩世。矿山杂岩体具有高w(Sr)(557×10-6~985×10-6)和w(Sr)/w(Y)(30.9~61.8)值,低w(Y)(11.52×10-6~22.10×10-6)和w(Yb)(1.30×10-6~2.00×10-6)值的特征,这和埃达克岩相似。Th、U和大离子亲石元素(Rb、Ba、K)富集,高场强元素(Nb、Ta、Zr、Hf)亏损。稀土元素配分曲线近乎一致,均显示为轻稀土富集、弱正铕异常的右倾型的特点。综合岩性组合、岩相特点、地球化学特征和锆石年代学特征认为,矿山杂岩体是在下地壳大规模拆沉基础上,经过连续俯冲的影响,拆沉下来的物质诱发软流圈上涌而部分熔融,并交代上覆亏损地幔岩体使其发生部分重熔为高Mg的类似埃达克岩浆而形成的。
英文摘要:
      Kuangshan complex in the South Taihangshan mountain mainly consists of diorite, quartz diorite and monzodiorite. The LA-ICS-MS dated zircon U-Pb age of the diorite is 125.2 Ma±1.4 Ma to 126.9 Ma±1.3 Ma corresponding to Early Cretaceous Period. The complex is similar to adakite with high w(Sr) (557×10-6-985×10-6) and w(Sr)/w(Y) (30.9-61.8), and low w(Y) (11.52×10-6-22.10×10-6) and w(Yb) (1.30×10-6-2.00×10-6). Th, U and large ion element (Rb, Ba, K) are enriched, high field strong element (Bb, Ta, Zr, Hf) lost. The REE pattern curve is almost the same declined to right with LREE enrichment and weakly positive Eu anomaly. Comprehensively considering characteristics of litho logic combination, lithofacies, geochemistry and zircon U-Pb chronology the complex is originated from continuous subduction and large scale delamination of the lower crust by which some of the delaminted material in duce upwell of asthnosphere to produce partially melted magma which in turn replace the overlying depleted mantle rock mass and partially rememelt them to produce the Mg-rich adakite-like rock.
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