西秦岭伯阳—元龙地区中泥盆统变砂岩碎屑锆石U-Pb年龄和地球化学特征及地质意义
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本文为大陆动力学国家重点实验室科技部专项(编号:201210133)的成果。


Detrital Zircon U-Pb Age, Geochemical Characteristics and Geological Significance of Meta-sandstones form Boyang—Yuanlong Area in The Western Qinling Orogenic Belt
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    摘要:

    对北秦岭—祁连结合部位伯阳—元龙地区一套变砂岩进行的碎屑锆石LA-ICP-MS U-Pb同位素测年结果表明,变砂岩碎屑锆石年龄的时间跨度极大(407~2483 Ma),有多个测点的年龄数据落入早泥盆世范围,说明变砂岩的沉积时代不应早于早泥盆世,结合区域地质资料将其形成时代确定为中泥盆世。变砂岩的主要物源是西秦岭造山带和扬子克拉通。结合地球化学特征推断变砂岩主体形成于活动大陆边缘构造背景,石英砂岩原岩中含有偏基性的火山物质,经过高绿片岩相—低角闪岩相变质作用形成富含黑云母和角闪石的变砂岩。本文的研究结果表明,中泥盆世天水—武山板块缝合带已经基本缝合,但未完全缝合,一方面导致源自扬子克拉通的碎屑物可以到达西秦岭北带,另一方面在西秦岭天水—武山构造带的部分区域可能仍有残余洋盆俯冲活动。

    Abstract:

    Objectives: The metasandstones in Boyang—Yuanlong area located between Tianshui—Wushan suture zone and Xinyang—Yuanlong ductile shear zone. Up to now, the study of the metasandstone in Boyang—Yuanlong area is not mature. Research of metasandstone in Boyang—Yuanlong area could offer important information for the study of Qinling orogenic belt. Methods:Based on the clastic zircon LA-ICP-MS U-Pb dating and the analysis of geochemical data, we discussed the age and structural environment of the metasandstone in Boyang—Yuanlong area. We Combined the zircon LA-ICP-MS U-Pb dating with geochemical data analysis and offer proof of the evolution of Tianshui—Wushan suture zone.Results:①The metasandstone was formed in Middle Devonian, and the clastic sediment comes mainly from the Northern Qinling orogenic belt and Yangtze craton;②The provenance of metasandstone was in Boyang—Yuanlong area is active continental margin in setting;③The closure of Tianshui—Wushan suture zone had been completed before Middle Devonian but not entirely.

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李亦飞,罗金海,徐欢,尤佳,陈冠旭.2018.西秦岭伯阳—元龙地区中泥盆统变砂岩碎屑锆石U-Pb年龄和地球化学特征及地质意义[J].地质论评,64(5):1087-1103,[DOI].
LI Yifei, LUO Jinhai, XU Huan, YOU Jia, CHEN Guanxu.2018. Detrital Zircon U-Pb Age, Geochemical Characteristics and Geological Significance of Meta-sandstones form Boyang—Yuanlong Area in The Western Qinling Orogenic Belt[J]. Geological Review,64(5):1087-1103.

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  • 收稿日期:2018-01-12
  • 最后修改日期:2018-07-23
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  • 在线发布日期: 2018-09-14
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