西秦岭临潭地区下白垩统—上新统陆相地层碎屑锆石UPb年代学及其物源分析
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本文为国家自然科学基金项目(编号 41872235、41872233、41802234)、中央高校基本科研业务费专项资金项目(编号 300103183081、300104282717、201810710233)、青海省国土资源厅-中国铝业公司公益性区域地质矿产调查基金项目(编号 200801)、中国地质调查局地质调查项目(编号12120114041201、DD2016007901)和国家留学基金委(编号 201806565026)联合资助成果。


Detrital zircon U- Pb age and provenance analysis of Lower Cretaceous- Pliocene continental strata at Lintan area in the West Qinling orogenic belt
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    摘要:

    选取西秦岭造山带临潭地区下白垩统磨沟组和新近系上新统临夏组碎屑岩为研究对象,运用LA- ICP- MS锆石U- Pb同位素年代学方法,探讨磨沟组和临夏组的物质来源。结果显示,碎屑锆石年龄谱可分为6组:①新太古代—古元古代(2627~1676 Ma);②中元古代(1487~1035 Ma);③新元古代(996~812 Ma);④早古生代(534~425 Ma);⑤晚古生代(409~252 Ma);⑥早中生代(250~197 Ma)。其中,新太古代—古元古代(2627~1676 Ma)的年龄数据约占总体的5031%,所占比例最大,其余年龄段所占比例则较少。下白垩统磨沟组和上新统临夏组中蕴含的锆石年龄信息分布特征较为一致,均有新元古代、早古生代、早中生代年龄峰值,以及华北板块特有的18 Ga和25 Ga年龄峰值。下白垩统磨沟组和上新统临夏组具有近源堆积为主的特征,合作- 岷县断裂北侧的中秦岭构造带为其提供了物源,碎屑锆石年龄谱特征记录了物源区地质体中的再旋回年龄信息。本研究对西秦岭中新生代的构造演化研究具有重要意义。

    Abstract:

    With clastic rocks of the Lower Cretaceous Mogou Formation and the Pliocene Linxia Formation at Lintan area in the West Qinling orogenic belt as the study object, the authors used LA- ICP- MS zircon U- Pb isotope geochronological method to explore the provenance of Mogou Formation and Linxia Formation, which has important significance of study of Meso- Cenozoic tectonic evolution of the West Qinling orogenic belt. The results show that the detrital zircon ages are divided into 6 groups: (1)The Neoarchean- Paleoproterozoic (2627~1676 Ma); (2)The Mesoproterozoic (1487~1035 Ma); (3)The Neoproterozoic (996~812 Ma); (4)The Early Paleozoic (534~425 Ma); (5)The Late Paleozoic (409~252 Ma); (6)The Early Mesozoic (250~197 Ma), of which, the Neoarchean- Paleoproterozoic (2627~1676 Ma) ages data possess the largest proportion, accounting for about 5031% of the total data. The other ages possess a smaller proportion. The provenance source of Mogou Formation and Linxia Formation were much more complicated and characterized by obvious diversity. The Zircon age distribution of the two samples was consistent, with the Indosinian, Caledonian, and Neoproterozoic age peaks, as well as the unique peaks of 18 Ga and 25 Ga in the North China Block. The Lower Cretaceous Mogou Formation and the Pliocene Linxia Formation are characterized by proximal deposition. The Middle Qinling tectonic belt provides provenance, and the age patterns of the detrital zircon recorded the age information of multi- recycling zircons in the geological bodies of the provenance area.

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李佐臣,裴先治,魏立勇,赵文川,王盟,刘成军,李瑞保,裴磊,陈有炘,秦利.2019.西秦岭临潭地区下白垩统—上新统陆相地层碎屑锆石UPb年代学及其物源分析[J].地质学报,93(9):2171-2186.
LI Zuochen, PEI Xianzhi, WEI Liyong, ZHAO Wenchuan, WANG Meng, LIU Chengjun, LI Ruibao, PEI Lei, CHEN Youxin, QIN Li.2019. Detrital zircon U- Pb age and provenance analysis of Lower Cretaceous- Pliocene continental strata at Lintan area in the West Qinling orogenic belt[J]. Acta Geologica Sinica,93(9):2171-2186.

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  • 收稿日期:2019-02-26
  • 最后修改日期:2019-04-27
  • 录用日期:2019-04-29
  • 在线发布日期: 2019-05-07
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