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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第45卷

期数:

2023年第02期

页码:

179-193

栏目:

基础地质与矿床地质

出版日期:

2023-03-15

文章信息/Info

Title:

Geochemistry and Petrogenesis of Yaganbuyang Granitic Gneiss in Mantelike Area of Altun, China

文章编号:

1672-6561(2023)02-0179-15

作者:

王瑞廷¹; 2; 3; 4; 袁海潮³; 5; 李 弦¹; 2; 3*; 李国旗⁵; 李青锋¹; 2; 3; 李博武⁶; 姚志亮⁶

(1. 陕西省矿产资源综合利用工程技术研究中心,陕西 西安 710054; 2. 陕西西北有色地质调查院有限公司,陕西 西安 710054; 3. 西北有色地质矿业集团有限公司 院士专家工作站,陕西 西安 710054; 4. 长安大学 地球科学与资源学院,陕西 西安 710054; 5. 咸阳西北有色七一二总队有限公司,陕西 咸阳 726000; 6. 西安西北有色物化探总队有限公司,陕西 西安 710068)

Author(s):

WANG Rui-ting¹; 2; 3; 4;  YUAN Hai-chao³; 5;  LI Xian¹; 2; 3*;  LI Guo-qi⁵;  LI Qing-feng¹; 2; 3;  LI Bo-wu⁶;  YAO Zhi-liang⁶

(1. Shaanxi Engineering Technology Research Center of Comprehensive Utilization of Mineral Resources, Xi'an 710054, Shaanxi, China; 2. Shaanxi Northwest Geological Survey Institute Co. Ltd. for Nonferrous Metals, Xi'an 710054, Shaanxi, China; 3. Academician and Expert Work Station, Northwest Nonferrous Geological and Mining Group Co., Ltd., Xi'an 710054, Shaanxi, China; 4. School of Earth Science and Resources, Chang'an University, Xi'an 710054, Shaanxi, China; 5. Xianyang No.712 Corps Limited of Northwest Nonferrous Geological and Mining Group, Xianyang 726000, Shaanxi, China; 6. Xi'an Northwest Nonferrous Geophysical and Geochemical Exploration Group Co., Ltd., Xi'an 710068, Shaanxi, China)

关键词:

花岗质片麻岩;  岩石学;  地球化学;  锆石U-Pb年龄;  阿尔金;  Rodinia超大陆

Keywords:

granitic gneiss;  petrology;  geochemistry;  zircon U-Pb age;  Altun;  Rodinia supercontinent

分类号:

P581; P597

DOI:

10.19814/j.jese.2022.10007

文献标志码:

A

摘要:

为了解阿尔金南缘在新元古代早期的构造-岩浆事件,选取曼特里克地区亚干布阳花岗质片麻岩进行详细的岩石学、同位素年代学和地球化学研究。结果表明:亚干布阳花岗质片麻岩形成于新元古代青白口纪,锆石U-Pb年龄为(880.3±3.4)Ma; 岩石属过铝质、钙碱性系列的镁质花岗岩,轻、重稀土元素分馏明显,Nb、Ta、Zr、Hf等高场强元素亏损,具有典型的地壳重熔型花岗岩特征,其岩浆来源于下地壳角闪岩相基性岩类的部分熔融,形成于同碰撞花岗岩区; 阿尔金南缘新元古代早期的构造-岩浆事件可能对应于新元古代Rodinia超大陆汇聚事件,说明塔里木板块和柴达木板块之间在新元古代早期曾经存在板块的汇聚碰撞。

Abstract:

In order to understand the tectono-magma events in the southern margin of Altun in Early Neoproterozoic, the Yaganbuyang granitic gneiss in Mantelike area was selected for detailed studies of petrology, isotope chronology and petrochemistry. The results show that Yaganbuyang granitic gneiss is formed in Neoproterozoic Qingbaikou period, and the zircon U-Pb age is(880.3±3.4)Ma; the rock with obvious fractional distillation of LREE and HREE and the loss of HFSEs such as Nb,Ta,Zr and Hf, is magnesian granite in the peraluminous and calc-alkaline series, and has the characteristics of crustal remelting granite, which originates from the partial melting of base rock in the amphibolite facies of the lower crust and forms in the syn-collisional granite zone. It is suggested that the tectono-magma events in the southern margin of Altun has the possiblity of matching to the assemblage events of Rodinia supercontinent in Neoproterozoic, indicating that assemblage collision occurs between Tarim and Qaidam plates at the early time.

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备注/Memo

备注/Memo:

收稿日期:2022-10-07; 修回日期:2023-01-21
基金项目:中国地质调查局地质调查项目(DD20160123); 国家重点研发计划项目(2022YFC2903605)
作者简介:王瑞廷(1969-),男,陕西杨凌人,西北有色地质矿业集团有限公司教授级高级工程师,博士研究生导师,理学博士,E-mail:wrtyf@163.com。
*通讯作者:李 弦(1983-),男,陕西西安人,西北有色地质矿业集团有限公司高级工程师,E-mail:57774864@qq.com。

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