西藏班公湖-怒江缝合带西段洞错蛇绿岩中的辉长岩锆石U-Pb年代学及地质意义

武勇; 陈松永; 秦明宽; 郭冬发; 郭国林; 张财; 杨经绥

doi:10.3799/dqkx.2018.710

西藏班公湖-怒江缝合带西段洞错蛇绿岩中的辉长岩锆石U-Pb年代学及地质意义

doi: 10.3799/dqkx.2018.710

1.
核工业北京地质研究院, 中核集团铀资源勘查实验室, 北京 100029
2.
地幔研究中心, 国土资源部深地动力学重点实验室, 中国地质科学院地质研究所, 北京 100037
3.
东华理工大学地球科学学院, 江西南昌 330013
4.
山西省地质博物馆, 山西太原 030024

基金项目:

国家自然科学基金项目 41373029

中国地质调查局项目 DD2016013628

国家自然科学基金项目 41541017

国家自然科学基金项目 41641015

中国地质调查局项目 DD2016002-07

中国地质调查局项目 DD20160023-01

详细信息

作者简介:
武勇(1986-), 男, 博士研究生, 主要从事铀矿地质勘查与二次离子质谱同位素地质年代学研究

中图分类号: P581;P588.124;P597.3
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出版历程
- 收稿日期: 2017-12-20
- 刊出日期: 2018-04-15

Zircon U-Pb Ages of Dongcuo Ophiolite in Western Bangonghu-Nujiang Suture Zone and Their Geological Significance

1.
CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Technology, Beijing Research Institute of Uranium Geology, Beijing 100029, China
2.
Center for Advanced Research on Mantle(CARMA), Key Laboratory of Deep-Earth Dynamics of Ministry of Land and Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
3.
Faculty of Earth Sciences, East China University of Technology, Nanchang 330013, China
4.
Shanxi Museum of Geology, Taiyuan 030024, China

摘要

摘要: 洞错蛇绿岩位于班公湖-怒江缝合带西段阿里地区，前人对其空间展布、构造环境及成因有过一定的探讨，但研究程度薄弱.选择洞错蛇绿岩中的辉长岩为研究对象，对其开展详细的岩相学、地球化学、年代学等工作，解读洋盆的形成时间及构造环境.结果表明，辉长岩与N-MORB相比具有较高的Mg^#，低K、Na、P和Ti的元素特征，亏损Hf、Zr、Nb等高场强元素（HFSE），具有轻稀土亏损型配分模式，表明可能源于N-MORB型亏损地幔源区.地球化学元素研究表明辉长岩岩浆源自亏损的尖晶石二辉橄榄岩~30%部分熔融，可能形成于与洋内俯冲相关的岛弧或者弧前构造环境，属于SSZ型蛇绿岩.辉长岩锆石的U-Pb测年指示其结晶年龄为222±4.8 Ma（MSWD=0.5，n=28），代表了辉长岩的形成年龄，佐证了洞错蛇绿岩形成于晚三叠世，表明班公湖-怒江特提斯洋盆从晚三叠世开始存在洋内俯冲消减地质作用.
- 蛇绿岩 /
- 辉长岩 /
- 构造环境 /
- 锆石U-Pb年龄 /
- 班公湖-怒江缝合带 /
- 地质年代学
Abstract: The Dongcuo ophiolite is located at the western part of Bangong-Nujiang River suture zone, Gaize County. In spite of previous studies on its spacious distribution, tectonic environment and genesis, the key problem remains unresolved. Taking the gabbro of Dongcuo ophiolite as the research object, a detailed study of petrography, geochemistry, petrology and geochronology is carried out to understand the formation of Bangong-Nujiang ocean basin, the tectonic settings of the Dongcuo ophiolite. Compared with N-MORB, the major and trace elements of Dongcuo ophiolite are characterized by high content in Mg^# and low content in K, Na, P, and Ti, the depletion of high field-strength elements (HFSE) of Hf, Zr, Nb and light rare earth element depletion. Geochemistry characteristics of the Dongcuo ophiolite indicate that it is originated from~30% partial melting of depleted spinel lherzolite formed in the tectonic environment of subduction-related island arc or fore arc, belonging to super subduction zone (SSZ) ophiolite. The LA-ICP-MS of zircon U-Pb dating yields the age of 222±4.8 Ma (MSWD=0.5), providing the age constraint on the Dongcuo ophiolite (Late Triassic), and showing that it belongs to the Tethyan system of the Bangong-Nujiang River suture zone, which indicates the intra-oceanic subduction process.
- ophiolite /
- gabbro /
- tectonic environment /
- zircon U-Pb dating /
- Bangong-Nujiang suture zone /
- geochronology

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图 1 班公湖-怒江缝合带蛇绿岩分布简图

据韦振权等(2007)

Fig. 1. The simplified geological sketch of the Bangong-Nujiang suture ophiolites

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图 2 研究区区域地质简图

1.第四系；2.古近系；3.晚侏罗-早白垩统沙木罗组；4.早侏罗统莎巧木罗组；5.侏罗统木噶岗日群；6.洞错蛇绿混杂岩；7.三叠统巫噶组；8.仲岗洋岛火山岩；9.逆冲推覆构造；10.性质不明断层；11.侵入岩；12.路线剖面.据中国地质调查局, 2006, 1:25万改则幅地质图

Fig. 2. Geological sketch of the research region

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图 3 野外地质路线剖面

1.第四系；2.均质辉长岩；3.堆晶辉长岩；4.辉绿岩脉；5.方辉橄榄岩；6.二辉橄榄岩；7.玄武安山岩；8.角砾状玄武岩；9.枕状玄武岩；10.断层/逆冲断层；11采样点

Fig. 3. Geological sketch map of the field

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图 4 洞错蛇绿岩中辉长岩野外及镜下照片

a.洞错辉长岩与K₁q去申拉组火山岩野外产状；b.洞错蛇绿岩中均质辉长岩；c.洞错蛇绿岩中堆晶辉长岩；d.洞错蛇绿岩中见有辉绿岩脉体.Cpx.单斜辉石；e, f.辉长岩显微照片；Ol.橄榄石；Pl.斜长石；Ser.蛇纹石；Am.角闪石

Fig. 4. Outcrops of gabbros and photomircographs of Dongcuo ophiolite

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图 5 洞错蛇绿岩中辉长岩的TAS和Zr/Ti-Nb/Y分类图解

Ir-Irvine分界线，上方为碱性，下方为亚碱性.侵入岩：1.橄榄辉长岩；2a.碱性辉长岩；2b.亚碱性辉长岩；3.辉长闪长岩；4.闪长岩；5.花岗闪长岩；6.花岗岩；7.硅英岩；8.二长辉长岩；9.二长闪长岩；10.二长岩；11.石英二长岩；12.正长岩；13.副长石辉长岩；14.副长石二长闪长岩；15.副长石二长正长岩；16.副长正长岩；17.副长深长岩；18.霓方钠岩/磷霞岩/粗白榴岩.Andesite.安山岩；Andesite or Basalt.玄武安山岩；SubAlkaline Basalt.亚碱性玄武岩；Rhyolite.流纹岩；Com/Pant.钠闪碱流岩/碱流岩；TrachyAnd.粗面岩/安山岩；Phonolite.响岩；Trachyte.粗面岩；据文献Winchester and Floyd(1977)

Fig. 5. TAS and Zr/Ti-Nb/Yb diagrams for the gabbro of the Dongcuo ophiolites

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图 6 洞错蛇绿岩中辉长岩稀土元素球粒陨石标准化图解(a)和微量元素原始地幔标准化图解(b)

球粒陨石、原始地幔、OIB、N-MORB和E-MORB值据Sun and McDonough(1989)

Fig. 6. REE pattern of Dongcuo ophiolite (a) and pattern of trace elements of Dongcuo ophiolite (b)

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图 7 洞错蛇绿岩中辉长岩锆石CL图像(15DC71)

Fig. 7. CL images of zircon from gabbro of Dongcuo ophiolite

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图 8 洞错蛇绿岩中辉长岩的LA-ICP-MS谐和图和加权年龄平均图

Fig. 8. The concordia curves and mean age of zircons LA-ICP-MS U-Pb data for the gabbro of Dongcuo ophiolite

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图 9 洞错蛇绿岩中辉长岩标准化的(FMM)形式

标准值来自Pearce and Parkinson(1993).VHI.极高度不相容元素；HI.高度不相容元素；MI.中等不相容元素

Fig. 9. The FMM-normalized patterns of the gabbro for Dongcuo ophiolite

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图 10 Dy/Yb-La/Y(a)和Sm/Yb-La/Sm(b)图解

据Xu et al.(2001); Aldanmaz et al.(2000)

Fig. 10. The diagram of Dy/Yb-La/Yb (a) and Sm/Yb-La/Sm (b) of the Dongcuo ophiolite

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图 11 构造环境判别图解

a.Th/Yb-Nb/Yb图解鉴别SSZ、MOR型蛇绿岩；b.V-Ti/1 000图解鉴别与俯冲相关的构造环境(MORB、IAT型蛇绿岩).据Pearce(2014)

Fig. 11. The diagrams to distinguish the tectonic settings

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图 12 Y/15-La/10-Nb/8图解

1A.钙碱性玄武岩；1B、1A、1C.钙碱-拉斑系列；2A.大陆玄武岩；2B.弧后盆地玄武岩；3A.碱性玄武岩；3B、3C.富集洋中脊(E-MORB)；3D.正常洋中脊(N-MORB).据Shervais(1982)

Fig. 12. The diagram of Y/15-La/10-Nb/8

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图 13 班公湖-怒江缝合带主要蛇绿岩的年龄分布

据潘桂堂等(2004)修改

Fig. 13. The age of the main ophiolite in the Bangong-Nujiang suture zone

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