|本期目录/Table of Contents|

[1]黄栋,张成立,马中平,等.西天山阿吾拉勒东南部晚石炭世—中二叠世中酸性小岩体成因及地质意义[J].地球科学与环境学报,2017,39(02):175-193.
 HUANG Dong,ZHANG Cheng-li,MA Zhong-ping,et al.Origin and Its Geological Significance of Late Carboniferous-Middle Permian Intermediate-acid Small Plutons in the Southeastern Awulale Area of West Tianshan, China[J].Journal of Earth Sciences and Environment,2017,39(02):175-193.
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西天山阿吾拉勒东南部晚石炭世—中二叠世中酸性小岩体成因及地质意义(PDF)
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第39卷
期数:
2017年第02期
页码:
175-193
栏目:
基础地质与矿产地质
出版日期:
2017-03-15

文章信息/Info

Title:
Origin and Its Geological Significance of Late Carboniferous-Middle Permian Intermediate-acid Small Plutons in the Southeastern Awulale Area of West Tianshan, China
文章编号:
1672-6561(2017)02-0175-19
作者:
黄栋张成立马中平何贤英高晓峰魏强杨蓉孙吉明李平
1.西北大学 大陆动力学国家重点实验室,陕西 西安  710069; 2.中国地质调查局西安地质调查中心,陕西 西安  710054; 3.中国石油新疆油田公司准东采油厂,新疆 阜康  831511
Author(s):
HUANG Dong ZHANG Cheng-liMA Zhong-ping HE Xian-ying GAO Xiao-feng WEI Qiang YANG Rong SUN Ji-ming LI Ping
1. State Key Laboratory of Continental Dynamics, Northwest University, Xi’an 710069, Shaanxi, China;2. Xi’an Center of Geological Survey, China Geological Survey, Xi’an 710054, Shaanxi, China;3. Zhundong Oil Production Plant, Xinjiang Oilfield Company, PetroChina, Fukang 831511, Xinjiang, China
关键词:
中酸性小岩体锆石U-Pb年龄地球化学Hf同位素成因后碰撞西天山
Keywords:
Intermediate-acid small plutons zircon U-Pb age geochemistry Hf-isotope origin post-collision West Tianshan
分类号:
P597+.3;P595
DOI:
-
文献标志码:
A
摘要:
西天山阿吾拉勒东南部艾肯达坂花岗岩和2752高地闪长玢岩浅成小岩体侵入于石炭系火山沉积岩中,岩石无变形,呈均一块状,具斑状/似斑状结构,属准铝质到弱过铝质高钾钙碱性花岗岩类,富集Rb、Th、U、K和Pb等大离子亲石元素,贫Zr、Hf等高场强元素,显示中等到弱的负Eu异常,亏损Nb、Ta、P、Ti和Sr等元素,具壳源岛弧区岩浆作用的地球化学特征。这两个岩体锆石均为正εHf(t)值和新元古代Hf陆壳模式年龄,指示其主要源自新元古代陆壳物质的部分熔融,个别锆石εHf(t)值明显高表明岩体形成过程还有幔源岩浆物质的加入。LA-ICP-MS锆石U-Pb定年分别获得2752高地闪长玢岩307 Ma和艾肯达坂花岗岩282 Ma的形成年龄,与区域上同期小岩体一同对应于西天山大规模壳-幔花岗岩浆活动末期,证明在晚石炭世—中二叠世期间,伴随着西天山大规模花岗岩浆活动的减弱,出现一期重要的小规模中酸性岩浆活动。综合分析西天山晩石炭世—中二叠世各类岩浆作用,该时期中酸性小岩体为后碰撞向陆内伸展拉张过渡阶段岩浆活动的产物,指示西天山晚石炭世晚期深部动力学背景和构造环境发生了重要转折。
Abstract:
Aikendaban granite and 2752 Gaodi dioritic porphyrite in the southeastern Awulale area of West Tianshan intrude into Carboniferous volcanicsedimentary sequences, showing undeformed uniform massive structures and porphyric/porphyriclike textures. Geochemically, they are enriched in large ion lithophile elements (Rb, Th, U, K, Pb, etc.), poor in high field strength elements (Zr, Hf, etc.), depleted in Nb, Ta, P, Ti, Sr, etc., Eu anomalies are weakmedium negative, displaying the feature similar to those of crust-derived magmatism in island arc. The zircons from Aikendaban granite and 2752 Gaodi dioritic porphyrite have positive εHf(t) and Neoproterozoic continental crust model age, suggesting that they result from the partial melting of Neoproterozoic continental crust materials; however, individual zircons have higher εHf(t),indicating the involvement of mantle-derived magmatic materials during the formation of granitic pluton. LA-ICP-MS zircon U-Pb ages of Aikendaban granite and 2752 Gaodi dioritic porphyrite are 282 Ma and 307 Ma, respectively; the ages correspond to the forming period of regional small plutons and the late period of large-scale crust-mantle granitic magmatism in West Tianshan, suggesting a small-scale intermediate-acid magmatism with the weakening of large-scale granitic magmatism from Late Carboniferous to Middle Permian. Based on the comprehensive analysis of Late Carboniferous-Middle Permian magmatism, the occurrence of these small plutons indicates an intermediate-acid magmatism, implying a decreasing of large-scale magmatism in the transitional stage from post-collision to intra-continental extension, and indicating an important turning point of the deep dynamical background and the tectonic environment in West Tianshan.

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备注/Memo

备注/Memo:
收稿日期:2016-12-09
基金项目:中国地质调查局地质调查项目(12120113042200,12120114020501)
作者简介:黄 栋(1991-),男,陕西西安人,理学硕士研究生,E-mail:923705850@qq.com。
通讯作者:张成立(1956-),男,河南滑县人,教授,博士研究生导师,理学博士,E-mail:clzhang@nwu.edu.cn。
更新日期/Last Update: 2017-03-31