|本期目录/Table of Contents|

[1]王超,陈斌,马星华,等.东天山三岔口地区早、晚古生代岩体成因及其对康古尔缝合带演化的意义[J].地球科学与环境学报,2015,37(05):52-70.
 WANG Chao,CHEN Bin,MA Xing-hua,et al.Petrogenesis of Early and Late Paleozoic Plutons in Sanchakou Area of East Tianshan and Their Implications for Evolution of Kangur Suture Zone[J].Journal of Earth Sciences and Environment,2015,37(05):52-70.
点击复制

东天山三岔口地区早、晚古生代岩体成因及其对康古尔缝合带演化的意义(PDF)
分享到:

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

卷:
第37卷
期数:
2015年第05期
页码:
52-70
栏目:
基础地质与矿产地质
出版日期:
2015-09-15

文章信息/Info

Title:
Petrogenesis of Early and Late Paleozoic Plutons in Sanchakou Area of East Tianshan and Their Implications for Evolution of Kangur Suture Zone
文章编号:
1672-6561(2015)05-0052-19
作者:
王超陈斌马星华鄢雪龙
1. 北京大学 地球与空间科学学院,北京 100871; 2. 北京大学 造山带与地壳演化教育部重点实验室,北京 100871; 3. 合肥工业大学 资源与环境工程学院,安徽 合肥 230009; 4. 中国地质科学院矿产资源研究所 国土资源部成矿作用与资源评价重点实验室,北京 100037; 5. 万宝矿产有限公司,北京 100053
Author(s):
WANG Chao CHEN Bin MA Xing-hua YAN Xue-long
1. School of Earth and Space Sciences, Peking University, Beijing 100871, China; 2. Key Laboratory of Orogenic Belts and Crustal Evolution of Ministry of Education, Peking University, Beijing 100871, China; 3. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, Anhui, China; 4. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
关键词:
花岗岩壳幔岩浆混合古生代岛弧康古尔缝合带构造演化东天山新疆
Keywords:
granite crust-mantle magma mixing Paleozoic island arc Kangur suture zone tectonic evolution East Tianshan Xinjiang
分类号:
P581
DOI:
-
文献标志码:
A
摘要:
对东天山地区三岔口矿岩体和三岔口东岩体的成因及构造背景进行探讨。三岔口矿岩体为一套花岗闪长岩-闪长岩体,形成于443 Ma,为晚奥陶世岩浆作用产物。三岔口矿岩体具有轻稀土元素及大离子亲石元素富集、高场强元素亏损的特征,表明其形成于岛弧环境,高放射成因Nd(εNd(t)=6.6~7.5)和低初始N(87Sr)/N(86Sr)值(0.703 69~0.703 89)表明岩浆混合中的基性端元很可能起源于俯冲带亏损的岩石圈地幔,幔源岩浆底侵导致下地壳部分熔融,并与生成的花岗质熔体混合形成中酸性岩浆。三岔口东岩体为一套花岗岩-花岗闪长岩-闪长岩体,侵位时代约为322 Ma,属于中亚造山带碰撞后岩浆作用的产物。三岔口东岩体同样具有岛弧岩浆特征,富集轻稀土元素及大离子亲石元素,亏损高场强元素,但其岛弧特征继承自其下地壳源区的性质,东天山地区下地壳主要是早古生代形成的深埋弧岩浆岩拼贴而成的。三岔口东岩体同样由壳幔岩浆混合作用形成,其基性端元可由区内同期基性—超基性岩体模拟。三岔口矿火山弧岩浆组合的确立可将康古尔地区俯冲作用的时间追溯至奥陶纪。晚石炭世早期,康古尔缝合带区域构造由挤压向拉伸转换,三岔口东岩体对应区域的后碰撞构造演化阶段。
Abstract:
The petrogenesis and tectonic setting of Sanchakou deposit pluton and East Sanchakou pluton in East Tianshan area were discussed. Sanchakou deposit pluton consists mainly of granodiorite-diorite, and LA-ICP-MS zircon U-Pb dating results indicate that Sanchakou deposit pluton forms at 443 Ma and is the product of Late Ordovician magmatism. This pluton exhibits island arc setting with the characteristics of enrichment in light rare earth element (LREE) and large ion lithophile element (LILE), and depletion in high field strength element (HFSE). High εNd(t) (6.6-7.5) and low initial N(87Sr)/N(86Sr) (0.703 69-0.703 89) suggest that the mafic end-member during magma mixing could have been originated from a young lithospheric mantle source, which is previously metasomatized by subduction zone melts/fluids in Early Paleozoic. Underplating of mantle-derived basaltic magma leads to partial melting of lower crust. Mixing of basaltic magma and the resultant crustal granitic melt forms the intermediate and acid magma. East Sanchakou pluton is mainly made up of granite-granodiorite-diorite, and LA-ICP-MS zircon U-Pb dating results suggest that this pluton is emplaced at about 322 Ma and is the product of post collisional magmatism of Central Asian orogenic belt. This pluton also exhibits island arc setting with the characteristics of enrichment in LREE and LILE, and depletion in HFSE, but the island arc setting characteristics are probably inherited from the lower crust source, which is dominated by Early Paleozoic deep island arc magmatite. This pluton is also formed by the mixing of crustal-mantle magma, and its mafic end-member can be simulated by the homochronous mafic-ultramafic pluton in East Tianshan area. The establishment of volcanic arc magmatic assemblage of Sanchakou deposit pluton shows that the subduction time in Kangur area can date back to Ordovician. Region tectonic transforms extrusion into extension at the early Late Carboniferous, East Sanchakou pluton is corresponding to the stage of regional post-collisional structural evolution.

参考文献/References:

-

相似文献/References:

[1]赵磊,漆富勇,李江东.江西赣县洋西坑钼矿床地质特征及Re-Os同位素测年[J].地球科学与环境学报,2013,35(04):77.
 ZHAO Lei,QI Fu-yong,LI Jiang-dong.Geological Characteristics and Re-Os Isotopic Dating of Yangxikeng Molybdenum Deposit in Ganxian of Jiangxi[J].Journal of Earth Sciences and Environment,2013,35(05):77.
[2]毕君辉,葛文春,张彦龙,等.佳木斯地块东部二叠纪锦山花岗杂岩体的成因及其地质意义[J].地球科学与环境学报,2014,36(04):16.
 BI Jun-hui,GE Wen-chun,ZHANG Yan-long,et al.Petrogenesis of Permian Jinshan Granitic Complex in the Eastern Jiamusi Massif and Its Geological Implication[J].Journal of Earth Sciences and Environment,2014,36(05):16.
[3]周争艳,杨家喜,徐涛,等.西秦岭天水地区早中生代草川铺花岗岩年代学、地球化学特征及其地质意义[J].地球科学与环境学报,2015,37(02):11.
 ZHOU Zheng-yan,YANG Jia-xi,XU Tao,et al.Geochronological and Geochemical Characteristics of Early Mesozoic Caochuanpu Granitoids in Tianshui Area of West Qinling and Their Geological Significance[J].Journal of Earth Sciences and Environment,2015,37(05):11.
[4]赖绍聪,赵少伟.川西北塔公石英闪长岩地球化学特征和岩石成因[J].地球科学与环境学报,2015,37(03):1.
 LAI Shao-cong,ZHAO Shao-wei.Geochemistry and Petrogenesis of Quartz Diorite in Tagong Area of Northwest Sichuan[J].Journal of Earth Sciences and Environment,2015,37(05):1.
[5]翟明国.大陆动力学的物质演化研究方向与思路[J].地球科学与环境学报,2015,37(04):1.
 ZHAI Ming-guo.New Research Interests and Concept of Material Evolution for Continental Dynamics[J].Journal of Earth Sciences and Environment,2015,37(05):1.
[6]高景刚,梁婷,李文渊,等.新疆额尔齐斯韧性剪切带新生锆石及其年代学意义[J].地球科学与环境学报,2015,37(04):15.
 GAO Jing-gang,LIANG Ting,LI Wen-yuan,et al.Neogenic Zircons in Ertix Ductile Shear Zone of Xinjiang and Their Geochronological Significance[J].Journal of Earth Sciences and Environment,2015,37(05):15.
[7]冯罡,万乐,刘正宏,等.内蒙古巴林右旗晚侏罗世巴彦琥硕花岗岩地球化学特征、锆石U-Pb年龄及Hf同位素组成[J].地球科学与环境学报,2015,37(06):33.
 FENG Gang,WAN Le,LIU Zheng-hong,et al.Geochemical Characteristics, Zircon U-Pb Age and Hf Isotopic Composition of Late Jurassic Bayanhushuo Granites in Balinyou Banner of Inner Mongolia[J].Journal of Earth Sciences and Environment,2015,37(05):33.
[8]叶永钦,叶松鑫,许幼,等.粤北长江铀矿田长排地区花岗岩体地球化学特征及其意义[J].地球科学与环境学报,2015,37(06):101.
 YE Yong-qin,YE Song-xin,XU You,et al.Geochemical Characteristics of Granite Body in Changpai Area of Changjiang Uranium Orefield, the Northern Guangdong and Their Significance[J].Journal of Earth Sciences and Environment,2015,37(05):101.
[9]孙兰兰,杨家喜,周争艳,等.适用于壳幔混合物源成因花岗岩中暗色微粒包体的单斜辉石压力计[J].地球科学与环境学报,2016,38(01):34.
 SUN Lan-lan,YANG Jia-xi,ZHOU Zheng-yan,et al.Clinopyroxene Geobarometer Applied to Mafic Microgranular Enclaves in Granite Originated from Crust-mantle Mixed Source[J].Journal of Earth Sciences and Environment,2016,38(05):34.
[10]孙会一,石玉若,赵希涛,等.北京密云地区早白垩世花岗岩SHRIMP锆石U-Pb年龄及其地质意义[J].地球科学与环境学报,2016,38(01):43.
 SUN Hui-yi,SHI Yu-ruo,ZHAO Xi-tao,et al.SHRIMP Zircon U-Pb Ages of Early Cretaceous Granites in Miyun Area of Beijing and Their Geological Significance[J].Journal of Earth Sciences and Environment,2016,38(05):43.

备注/Memo

备注/Memo:
收稿日期:2015-05-07
基金项目:国家305项目(2011BAB06B04-2);国家自然科学基金项目(41202033)
作者简介:王超(1987-),男,河北衡水人,理学博士研究生,E-mail:wangchaopku@126.com。
通讯作者:陈斌(1964-),男,安徽全椒人,教授,博士研究生导师,理学博士,E-mail:binchen@pku.edu.cn。
更新日期/Last Update: 2015-09-28