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西藏阿翁错地区早白垩世花岗闪长岩——班公湖-怒江洋壳南向俯冲消减证据

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尹滔, 李威, 尹显科, 张伟, 袁华云, 裴亚伦. 2019. 西藏阿翁错地区早白垩世花岗闪长岩——班公湖-怒江洋壳南向俯冲消减证据[J]. 中国地质, 46(5): 1105-1115. doi: 10.12029/gc20190511
引用本文: 尹滔, 李威, 尹显科, 张伟, 袁华云, 裴亚伦. 2019. 西藏阿翁错地区早白垩世花岗闪长岩——班公湖-怒江洋壳南向俯冲消减证据[J]. 中国地质, 46(5): 1105-1115. doi: 10.12029/gc20190511
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YIN Tao, LI Wei, YIN Xianke, ZHANG Wei, YUAN Huayun, PEI Yalun. 2019. The Early Cretaceous granodiorites in the Aweng Co area, Tibet: Evidence for the subduction of the Bangong Co-Nujiang River oceanic crust to the south[J]. Geology in China, 46(5): 1105-1115. doi: 10.12029/gc20190511
Citation: YIN Tao, LI Wei, YIN Xianke, ZHANG Wei, YUAN Huayun, PEI Yalun. 2019. The Early Cretaceous granodiorites in the Aweng Co area, Tibet: Evidence for the subduction of the Bangong Co-Nujiang River oceanic crust to the south[J]. Geology in China, 46(5): 1105-1115. doi: 10.12029/gc20190511
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西藏阿翁错地区早白垩世花岗闪长岩——班公湖-怒江洋壳南向俯冲消减证据

  • 四川省地质调查院 稀有稀土战略资源评价与利用四川省重点实验室, 四川 成都 610081

  • 基金项目:
    中国地质调查局项目（DD20160026，DD20191029）资助
详细信息
    作者简介: 尹滔, 男, 1983年, 硕士生, 工程师, 主要从事地质调查与矿产勘查; E-mail:406593621@qq.com

  • 中图分类号: P588.12+1

The Early Cretaceous granodiorites in the Aweng Co area, Tibet: Evidence for the subduction of the Bangong Co-Nujiang River oceanic crust to the south

  • Evaluation and Utilization of Strategic Rare Metals and Rare Earth Resource Key Laboratory of Sichuan Province, Sichuan Geological Survey, Chengdu 610081, Sichuan, China

  • Fund Project: Supported by China Geological Survey Project (No. DD20160026, No. DD20191029)
More Information
    Author Bio: YIN Tao, male, born in 1983, engineer, master candidate, mainly engages in geological survey and mineral resources exploration. E-mail:406593621@qq.com .

    摘要

  • 对拉萨地块北部阿翁错地区花岗闪长岩进行了年龄分析、岩石地球化学研究。锆石LA-ICP-MS定年测得花岗闪长岩U-Pb年龄为（114.4±1.9）Ma，属于早白垩世晚期岩浆活动的产物。花岗闪长岩地球化学特征表明，其具有典型镁安山岩/闪长岩（MA）的地球化学特征，所有样品均具有较高Mg#值（45.42~54.29），低的TFeO*/MgO值（1.58~2.26）；所有样品都显示轻稀土元素富集，富集大离子亲石元素，亏损高场强元素的特征。研究表明，阿翁错花岗闪长岩是班公湖-怒江洋壳在俯冲消减背景下，由俯冲洋壳脱水熔融产生的溶体与地幔橄榄岩发生交代作用的产物，为晚中生代班公湖-怒江洋盆的南向俯冲消减提供了直接的岩石学、地球化学、年代学证据。

    This paper reports zircon U-Pb data of major and trace elements for the granodiorites from the Aweng Co area in northern Lhasa block. Zircon LA-ICP-MS U-Pb dating of granodiorite yielded an age of 163.3 ±1.7 Ma, suggesting that the intruded rocks were formed in late Early Cretaceous period. Geochemical studies show that Aweng Co granodiorites have typical geochemical characteristics similar to the magnesian andesite/diorite (MA). They are characterized by high Mg# values (45.42~54.29) and low TFeO*/MgO ratios (1.58~2.26). They are enriched in LREE in the chondrite-normalized REE patterns, and are enriched in large ion lithophile elements (LILEs) and depleted in high field strength elements (HFSEs). Geochemical features of the Aweng Co magnesian granodiorites are considered to have been generated by the southward subduction of Bangong Co-Nujiang River oceanic lithosphere, and can be genetically regarded as resulting from partial melting of dewatered and subducted oceanic crust melts, which had been metasomatized by mantle peridotite under the condition of oceanic crust subduction. These results provide direct petrologic evidence of the intruded rocks for the southward subduction of the Bangong Co-Nujiang River Ocean.

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  • 图 1  阿翁错—盐湖地区地质图及采样位置

    Figure 1. 

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    图 2  阿翁错花岗闪长岩锆石阴极发光图像（含U-Pb年龄值）

    Figure 2. 

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    图 3  阿翁错花岗闪长岩锆石U-Pb谐和图

    Figure 3. 

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    图 4  阿翁错花岗闪长岩K2O-SiO2（a，据Rickwood，1989）及A/CNK-A/NK（b，据Maniar and Piccoli, 1989）图解

    Figure 4. 

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    图 5  阿翁错花岗闪长岩球粒陨石标准化稀土元素配分曲线图（a，标准化值据Boynton，1984）及原始地幔标准化微量元素蛛网图（b，标准化值据Sun and McDonough, 1989）

    Figure 5. 

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    图 6  MA的SiO2-MgO图（a）和SiO2-FeO*/MgO图（b）（据Deng et al., 2009修改）

    Figure 6. 

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    图 7  阿翁错花岗闪长岩选择性地球化学图解

    Figure 7. 

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    表 1  阿翁错花岗闪长岩LA-ICP-MS锆石U-Pb定年结果

    Table 1.  LA-ICP-MS zircon U-Pb dating results of the Aweng Co granodiorites

    下载: 导出CSV

    表 2  阿翁错花岗闪长岩主量元素(%)和微量元素（10-6）分析结果

    Table 2.  Major elements(%) and trace elements(10-6)compositions of the Aweng Co granodiorites

    下载: 导出CSV
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收稿日期:  2017-06-01
修回日期:  2018-06-15
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