[1]钟文丽,邓江红,张成江,等.川西扎瓦拉花岗岩锆石U-Pb年代学与地球化学特征及其地质意义[J].四川师范大学学报(自然科学版),2017,(04):544-553.[doi:10.3969/j.issn.1001-8395.2017.04.019 ]
 ZHONG Wenli,DENG Jianghong,ZHANG Chengjiang,et al.Zircon U-Pb Geochronology, Geochemistry and Their Geological Significance of the Zhawala Granite in Western Sichuan, China[J].Journal of SichuanNormal University,2017,(04):544-553.[doi:10.3969/j.issn.1001-8395.2017.04.019 ]
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川西扎瓦拉花岗岩锆石U-Pb年代学与地球化学特征及其地质意义()
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《四川师范大学学报(自然科学版)》[ISSN:1001-8395/CN:51-1295/N]

卷:
期数:
2017年04期
页码:
544-553
栏目:
基础理论
出版日期:
2017-04-30

文章信息/Info

Title:
Zircon U-Pb Geochronology, Geochemistry and Their Geological Significance of the Zhawala Granite in Western Sichuan, China
文章编号:
1001-8395(2017)04-0544-10
作者:
钟文丽12 邓江红12 张成江12 刘家铎3 李佑国12
1. 成都理工大学 构造成矿成藏国土资源部重点实验室, 四川 成都 610059;
2. 成都理工大学 地球科学学院, 四川 成都 610059;
3. 成都理工大学 油气藏地质及开发工程国家重点实验室, 四川 成都 610059
Author(s):
ZHONG Wenli12 DENG Jianghong12 ZHANG Chengjiang12 LIU Jiaduo3 LI Youguo12
1. Key Laboratory of Tectonic Controlled Mineralization and Oil Reservoir, Ministry of Land Resources, Chengdu University of Technology, Chengdu 610059, Sichuan;
2. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan;
3. State Key Laboratory of Oil &
Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan
关键词:
锆石U-Pb年代学 地球化学 LA-MC-ICP-MS定年 构造环境 扎瓦拉花岗岩
Keywords:
Zircon U-Pb geochronology geochemistry LA-MC-ICP-MS dating tectonic environments Zhawala granite.
分类号:
P588.121; P597.3
DOI:
10.3969/j.issn.1001-8395.2017.04.019
文献标志码:
A
摘要:
扎瓦拉岩体是川西藏东地区江达花岗岩带冬普-罗麦亚带花岗岩的重要组成部分,岩性组合为:石英二长岩→花岗闪长岩→二长花岗岩.研究表明:扎瓦拉岩体的石英二长岩和钾长花岗岩的LA-MC-ICP-MS锆石U-Pb年龄分别为(225.4±1.1)Ma和(218.0±1.1)Ma,时代属晚三叠世卡尼期,该岩石具有高硅、钛、钙,贫铝、镁、钠,相对富钾贫钠、准铝质等特征,为富钾钙碱性系列花岗岩.岩石的稀土总量偏高,轻稀土明显富集,弱负Eu异常; 富集Rb、Ba、Th、U等大离子亲石元素,亏损Nb、Ta、P、Ti等高场强元素,表现出火山弧花岗岩的地球化学特征.扎瓦拉岩体形成于造山期板块俯冲碰撞型火山弧环境,岩浆可能源于岛弧不成熟陆壳的部分熔融,并混有部分幔源组分,属于早晚三叠世,金沙江洋壳向西俯冲,发生弧-陆碰撞造山作用的产物.
Abstract:
Zhawala granite is an important part of the Jiangda granite belt, Dongpu-Luomai subzone in western Sichuan and eastern Tibet. Its lithological combination is quartz monzonite→Granodiorite→Adamellite. In this paper, the analyses of LA-MC-ICP-MS U-Pb zircon indicate that the age of quartz monzonite is(225.4±1.1)Ma, and the moyite is(218.0±1.1)Ma within the late Triassic Carnian. The Zhawala granite is characteristic of high silicon, titanium and calcium whereas low aluminum, magnesium and sodium. It is relatively rich in Potassium, lack of Sodium and metaluminous, which is the high-K calc-alkaline body. The total rare earth elements of the Zhawala granite are relatively high. The LREE patterns are relatively concentrated, and a weak negative Eu anomaly. The study of Zhawala granite samples shows enrichment of the large ion lithophile elements Rb, Ba, Th,U and depletions of high field strength elements Nb、Ta、P、Ti. The rocks show geochemical characteristics of volcanic arc granites. They formed in the subduction collision orogenic-type volcanic arc environment. The magma may originate from partial melting of the immature continental crust in island arc, mixed with some mantle constituents. We conclude that the oceanic crust of Jinsha River subducted westward and the Zhawala granite was the result of the arc-continent collision orogeny in the early of late Triassic.

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备注/Memo

备注/Memo:
收稿日期:2017-03-08
基金项目:国家自然科学基金(41372093)和中国地质调查局地调项目(1212011120587)
第一作者简介:钟文丽(1980—),女,博士,主要从事矿床学与矿相学方面的研究,E-mail:zhongwenli07@cdut.cn
更新日期/Last Update: 2017-04-30