|本期目录/Table of Contents|

[1]马建军,王珩,何川,等.南祁连造山带新元古代后碰撞岩浆作用：年代学和地球化学证据[J].地球科学与环境学报,2018,40(02):133-154.
　MA Jian-jun,WANG Heng,HE Chuan,et al.Neoproterozoic Post-collision Magmatism in South Qilian Orogen, China: Evidenced by Geochronology and Geochemistry[J].Journal of Earth Sciences and Environment,2018,40(02):133-154.
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南祁连造山带新元古代后碰撞岩浆作用：年代学和地球化学证据(PDF)
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第40卷
期数:
2018年第02期
页码:
133-154
栏目:
基础地质与矿产地质
出版日期:
2018-03-15

文章信息/Info

Title:
Neoproterozoic Post-collision Magmatism in South Qilian Orogen, China: Evidenced by Geochronology and Geochemistry
文章编号:
1672-6561(2018)02-0133-22
作者:
马建军; 王珩; 何川; 王璐; 王勤燕; 陈能松
1.中国地质大学(武汉) 地球科学学院，湖北 武汉 430074； 2.浙江大学 地球科学学院，浙江 杭州 310027
Author(s):
MA Jian-jun;  WANG Heng;  HE Chuan;  WANG Lu;  WANG Qin-yan;  CHEN Neng-song
1. School of Earth Sciences, China University of Geosciences, Wuhan 430074, Hubei, China;2. School of Earth Sciences, Zhejiang University, Hangzhou 310027, Zhejiang, China
关键词:
花岗岩; 锆石 U-Pb年龄; 后碰撞岩浆作用; Rodinia超大陆; 乌北地体; 南祁连造山带
Keywords:
granite;  zircon U-Pb age;  post-collisional magmatism;  Rodinia supercontinent;  North Wulan terrane;  South Qilian Orogen
分类号:
P597+.3；P588.12+1
DOI:
-
文献标志码:
A
摘要:
南祁连造山带南缘乌北地体中的柯柯沙花岗岩岩浆作用记录了中国西北部响应全球Rodinia超大陆汇聚过程中长时间的后碰撞花岗岩岩浆作用历史。柯柯沙花岗闪长岩和二长花岗岩的LA-ICP-MS 锆石U-Pb定年获得其锆石结晶年龄分别为(861±9)～(863±4)Ma和(827±6)～(830±8)Ma，变质锆石年龄为(463±3)Ma。结合先期获得的年龄数据，柯柯沙花岗岩体可能为约860 Ma和810～830 Ma的两阶段岩浆作用产物。花岗闪长岩和二长花岗岩分别呈弱过铝质和弱—强过铝质的高钾钙碱性S型花岗岩特征，其岩浆形成于后碰撞阶段的伸展构造环境，源区岩石主要为变质杂砂岩，岩浆部分熔融温度约为800℃，压力在 0.9～1.4 GPa之间。综上所述，乌北地体主碰撞阶段结束于860 Ma之前。
Abstract:
The protracted post-collisional magmatism in response to assembly of the global Rodinia supercontinent in Northwest China is recorded by the magmatism of Kekesha granite pluton in North Wulan terrane of South Qilian Orogen, China. LA-ICP-MS zircon U-Pb  dating yields crystallization ages of (861±9)-(863±4)Ma and (827±6)-(830±8)Ma for Kekesha granodiorites and monzogranites, respectively, with a metamorphic age of (463±3)Ma. Combined with the previous ages, Kekesha granite pluton may be produced by two stages of magmatism around 860 Ma and 810-830 Ma. The granodiorites and monzogranites are characterized respectively by weakly peraluminous and weakly-strongly peraluminous but totally high potassium calc-alkaline S-type granites, and the precursor magma is formed in the extensional tectonic environment of the post-collision stage, and the source rocks are dominantly metagraywackes with magmatic partial melting temperature of 800 ℃ and pressures of 0.9-1.4 GPa. In conclusion, the main collision phase of  North Wulan terrane ends before 860 Ma.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2018-01-08;修回日期:2018-03-14 
基金项目:国家自然科学基金项目(41372075)
作者简介:马建军(1991-),男,回族,新疆伊宁人,理学硕士研究生,E-mail:1620001680@qq.com。
通讯作者:陈能松(1956-),男,广西南宁人,教授,博士研究生导师,理学博士,E-mail:chennengsong@163.com。
更新日期/Last Update: 2018-04-19