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雅鲁藏布江蛇绿岩的侵位机制：一个新的分析模型

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罗照华. 2019. 雅鲁藏布江蛇绿岩的侵位机制：一个新的分析模型[J]. 中国地质, 46(1): 21-31. doi: 10.12029/gc20190102
引用本文: 罗照华. 2019. 雅鲁藏布江蛇绿岩的侵位机制：一个新的分析模型[J]. 中国地质, 46(1): 21-31. doi: 10.12029/gc20190102
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LUO Zhaohua. 2019. The emplacement of the Yarlung Zangbo ophiolites:A new analytical model[J]. Geology in China, 46(1): 21-31. doi: 10.12029/gc20190102
Citation: LUO Zhaohua. 2019. The emplacement of the Yarlung Zangbo ophiolites:A new analytical model[J]. Geology in China, 46(1): 21-31. doi: 10.12029/gc20190102
shu

雅鲁藏布江蛇绿岩的侵位机制：一个新的分析模型

  • 中国地质大学地质过程与矿产资源国家重点实验室, 北京 100083

  • 基金项目:
    中国地质调查局地质大调查项目（121201102000150069-01，1212011220921）资助
详细信息
    作者简介: 罗照华, 1956年生, 男, 教授, 博士生导师, 矿物学、岩石学、矿床学专业, 从事火成岩岩石学、区域岩石大地构造研究; E-mail:luozh@cugb.edu.cn

  • 中图分类号: P588.14

The emplacement of the Yarlung Zangbo ophiolites:A new analytical model

  • State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China

More Information
    Author Bio: LUO Zhaohua, male, born in 1956, professor, supervisor of doctor candidates, engages in the study of igneous petrology and regional geotectonics .

    摘要

  • 蛇绿岩侵位机制是板块构造理论中一直没有得到合理阐释的科学问题，制约了许多次级问题的解决。本文综述了已发表的关键资料和地质观察，提出了一个新的分析模型。蛇绿岩带的长距离延伸表明其形成过程与板块汇聚过程紧密相关；冈底斯岩浆弧的两期弧岩浆活动暗示汇聚板块边缘的构造性质曾经发生过转换；前人报道的玻安岩缺乏充分的地质学、岩石学和矿物学约束；强还原晶体群的普遍性暗示蛇绿岩侵位过程与大规模流体活动有关。据此，本文提出了一个由流体协助的蛇绿岩侵位模型，认为俯冲板块回卷、断离、流体-岩石圈相互作用、大洋岩石圈穹隆等过程是蛇绿岩侵位的基本控制因素。

    The emplacement mechanism of ophiolites is a scientific problem in the plate tectonics which has not been clearly explained till now, and such a situation restricts resolving many secondary questions. In this paper, a new analytical model is proposed on the basis of combination of the key published data and the field observations. The large length of the ophiolite belt suggests a close relation between its formation and the converging plate process; the two phases of arc magmatism in the Gandise magmatic arc indicate translation of the tectonic features at the converging plate edges; there are not sufficient geological, petrological and mineralogical constraints in the previous reports about boninite; the universal discovery of the strongly reduced crystal populations suggests that the obduction process of ophiolite was related to the large scale activity of the deep fluids. Accordingly, a new model of ophiolite emplacement is proposed and called fluid-assisting model, in which the processes such as rollback and break-off of the subducted plate, fluid-lithosphere interaction, and oceanic lithosphere dome seem to have been the essential factors controlling ophiolite emplacement.

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  • 图 1  雅鲁藏布江缝合带(YZSZ)蛇绿岩的地质特征

    Figure 1. 

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    图 2  利用火成岩全岩化学预测的源区残留橄榄石牌号

    Figure 2. 

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    图 3  日喀则"玻安岩"与Izu-bonin-Mariana弧和Tonga弧玻安岩的比较(图例同图 2)

    Figure 3. 

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    图 4  罗布莎方辉橄榄岩中的蛇纹石脉照片

    Figure 4. 

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    图 5  雅鲁藏布江蛇绿岩侵位模型

    Figure 5. 

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收稿日期:  2018-07-22
修回日期:  2019-01-17
刊出日期:  2019-02-25

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