[1]史少飞,袁浩为,肖渊甫.2018.西藏青龙乡地区早白垩世侵入岩年代学和地球化学: 对班公湖-怒江洋盆闭合时限的制约.大地构造与成矿学,优先出版:001-14.doi:10.16539/j.ddgzyckx.2019.04.019
 SHI Shaofei,YUAN Haowei,XIAO Yuanfu.2018.Geochronology and Geochemistry of Early Cretaceous Intrusive Rocks in Qinglong Township Area, Tibet: Constraints on Closure Time of Bangonghu-Nujiang Ocean Basin.Geotectonica et Metallogenia,优先出版:001-14.doi:10.16539/j.ddgzyckx.2019.04.019
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西藏青龙乡地区早白垩世侵入岩年代学和地球化学: 对班公湖-怒江洋盆闭合时限的制约
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《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]

卷:
期数:
2018年优先出版
页码:
001-14
栏目:
其它
出版日期:
2019-12-30

文章信息/Info

Title:
Geochronology and Geochemistry of Early Cretaceous Intrusive Rocks in Qinglong Township Area, Tibet: Constraints on Closure Time of Bangonghu-Nujiang Ocean Basin
作者:
史少飞1 袁浩为1 肖渊甫1 魏永峰1 2 邱婵媛1 江小强1
1.成都理工大学 地球科学学院, 四川 成都 610059; 2.四川省地质矿产勘查开发局 区域地质调查队, 四川 成都 610059
Author(s):
SHI Shaofei1 YUAN Haowei1 XIAO Yuanfu1 WEI Yongfeng1 2 QIU Chanyuan1 and JIANG Xiaoqiang1
1. College of Geosciences, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 2. Regional Geological Survey Team of Sichuan Geological and Mineral Exploration and Development Bureau, Chengdu 610059, Sichuan, China
关键词:
锆石U-Pb年龄 地球化学 闭合时限 班公湖-怒江洋盆 冈底斯带北缘
Keywords:
zircon U-Pb age data geochemistry closure time Bangonghu-Nujiang oceanic basin northern margin of Gangdise belt
分类号:
P595, P597
DOI:
10.16539/j.ddgzyckx.2019.04.019
文献标志码:
A
摘要:
以西藏冈底斯带北缘青龙乡出露的侵入岩为研究对象, 进行了岩石学、锆石U-Pb测年和岩石地球化学分析, 据此对其岩石成因和大地构造意义进行探讨。侵入岩岩性主要为二云母花岗岩和黑云母石英二长岩。LA-ICP-MS锆石U-Pb测年结果显示二云母花岗岩年龄为123.4±2.2 Ma, 属早白垩世中期, 黑云母石英二长岩年龄为112.2±1.5 Ma, 属早白垩世晚期。据岩石学、主量元素特征分析, 二云母花岗岩为过铝质钙碱性系列岩石, 黑云母石英二长岩为准铝质钾玄系列岩石; 微量元素特征显示: 二云母花岗岩大离子亲石元素Rb、Th、U、K、Pb明显富集, 高场强元素Nb、Ta、Ti亏损明显, 为岛弧花岗岩, 黑云母石英二长岩大离子亲石元素及高场强元素Rb、K、Th、Ce、Zr、Hf明显富集, Br、Nb、Sr、P、Ti亏损较明显, 为同碰撞花岗岩。球粒陨石标准化稀土元素配分模式两者均表现为轻稀土富集的右倾型, 反映了源区地壳成熟度较高的特征, 且二云母花岗岩总体具极不明显的负Eu异常, 黑云母石英二长岩则具明显的负Eu异常。综合地球化学特征、构造图解判别及区域构造演化分析, 得出该地区出露的二云母花岗岩形成于班公湖-怒江洋盆俯冲于拉萨地体之下的消减环境, 是部分熔融的下地壳基性物质与上地壳沉积物质共同作用的产物; 黑云母石英二长岩形成于班公湖-怒江洋盆与拉萨地体同碰撞的挤压环境, 是上地壳(变)沉积岩部分熔融的产物。根据青龙乡地区侵入岩的地球化学特征及形成年代, 将班公湖-怒江洋盆闭合时限约束在123~112 Ma之间, 为早白垩世晚期。
Abstract:
In this paper, the intrusive rocks exposed in Qinglong Township, northern margin of Gangdise belt, Tibet, are studied by petrology, zircon U-Pb age data and geochemical analysis; On this basis, the petrogenesis and tectonic significance of the rocks are discussed. The lithology of the intrusive rocks includes two mica granite and biotite quartz monzonite. The results of LA-ICP-MS zircon age data show that the age of the two mica granite is 123.4±2.2 Ma, belonging to the middle of Early Cretaceous, and the age of the biotite quartz monzonite is 112.2±1.5 Ma, belonging to the late Early Cretaceous. According to the analysis of petrology and major element characteristics, both of them have the characteristics of high silicon, high aluminium, low calcium, low magnesium, low iron and low titanium; The two mica granite is peraluminous calc-alkaline series rock, the biotite quartz monzonite is quasi-aluminous shoshonite series rock, and the trace element characteristics show that the LILE(Rb, Th, U, K, Pb) of the two mica granite are obviously enriched, and the HFSE(Nb, Ta, Ti) are obviously depleted, It belongs to island arc granite. The LILE and HFSE of biotite quartz monzonite are rich in Rb, K, Th, Ce, Zr, Hf and depleted in Br, Nb, Sr, P, Ti obviously, It belongs to collisional granite. The both of REE diagrams show rightward incline and the NLG were enriched in large-ion lithophile elements, it reflects the characteristics of the crust in the source area. In general, the two mica granite has very insignificant negative Eu anomaly, the biotite quartz monzonite has obvious negative Eu anomaly. Based on the analysis of geochemical characteristics, structural graphic discrimination and regional tectonic evolution, it is concluded that the two mica granite outcropped in this area was formed under the subduction environment of the Bangonghu-Nujiang Ocean Basin beneath the Lhasa subterrane, and was the product of the interaction of partially melted basic material of the lower crust and sediment of the upper crust. the biotite quartz monzonite was formed in the compressive environment of collision between Bangonghu-Nujiang oceanic basin and Lhasa subterrane, and was the product of partial melting of upper crust (metamorphic) sedimentary rocks. According to the geochemical characteristics and formation age of the intrusive rocks in Qinglong Township area, the closure time of the Bangonghu-Nujiang oceanic basin is from 123 to 112 Ma, which is the late Early Cretaceous.

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备注/Memo

备注/Memo:
收稿日期: 2018-12-03; 改回日期: 2019-07-16
项目资助: 西藏1∶50000青龙乡(H46E006005、H46E006006、H46E007005、H46E007006)4幅地质矿产调查(1212011221083)项目成果。
第一作者简介: 史少飞(1992-), 男, 硕士研究生。矿物学、岩石学、矿床学专业。Email: 18010118029@163.com
通信作者: 肖渊甫(1957-), 男, 教授, 博士生导师。从事岩石学研究及矿产资源评价工作。Email: xyf@cdut.edu.cn
更新日期/Last Update: 2019-09-18