Late Paleoproterozoic tectonothermal events in the North China Craton as revealed by rutile U-Pb dating of the Sushui Complex

IF 3.2 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Precambrian Research Pub Date : 2024-07-03 DOI:10.1016/j.precamres.2024.107495

Bowen Si , Chunrong Diwu , Tingyi Wang , Baoping Gan

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引用次数: 0

Abstract

The Sushui Complex is an important component of the Precambrian basement in the southern North China Craton (NCC), and it mainly formed in the time interval from the Neoarchean to Paleoproterozoic. Although it is confirmed that the Paleoproterozoic is a key period for the final amalgamation of the NCC, and the granulite facies metamorphism can be recognized in the Sushui Complex. However, limited studies suggest that the Sushui Complex has undergone Paleoproterozoic metamorphism. Thus, a significant controversy exists regarding whether the Sushui Complex has been involved and reworked by the final assembly of the NCC. Rutile, one of the most important titanium minerals, occurs in a variety of medium- to high-grade metamorphic rocks, which have a lower closure temperature (500–630 °C) than zircon (>850 °C), thus rutile can record a wealth of useful and additional information about subsequent magmatic and metamorphic events, which makes it a complementary mineral to zircon to reveal the complete geologicalal history. In this contribution, we carried out the LA-ICP-MS U-Pb dating on zircon and rutile grains that collected from the Sushui Complex. Zircons from two trondhjemitic gneiss samples yield crystallization ages of 2520 and 2509 Ma. Rutile grains from the samples give the metamorphic ages of 1937, 1840, and 1811 Ma, respectively. The mica schist sample records the two populations of rutile U-Pb ages of 1924 and 1832 Ma. Zircon U-Pb dating reveal that the monzogranite sample was emplaced at 2300 Ma, and rutiles in the sample yield variable ages ranging from 2079 to 1715 Ma with a main peak age of 1820 Ma. The rutile U-Pb ages of the Sushui Complex reveal two distinct stages of metamorphism. The period of 1937–1924 Ma corresponds to the timing that is close to the peak metamorphism; whereas the subsequent period of 1840–1811 Ma indicates the cooling age associated with the exhumation of the basement in the Zhongtiao Mountains. Available studies reveal that the Sushui Complex has experienced Paleoproterozoic metamorphism during the final assembly of the NCC. In addition, our study provides an excellent example of how rutile U-Pb dating is a valuable geochronological tool for revealing late tectonothermal events of the Precambrian metamorphic terranes.

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苏水岩群金红石U-Pb年代测定揭示的华北克拉通晚古生代构造热事件

苏水复合地块是华北克拉通（NCC）南部前寒武纪基底的重要组成部分，主要形成于新元古代至古元古代。虽然已证实古元古代是华北克拉通最终汞齐化的关键时期，并且在苏水复合体中可见到花岗岩变质作用。然而，有限的研究表明，须水岩群经历了古新生代变质作用。因此，关于苏水岩群是否参与了泥盆纪的最终组装和再加工，还存在很大争议。金红石是最重要的钛矿物之一，存在于各种中高级变质岩中，其闭合温度（500-630 °C）低于锆石（850 °C），因此金红石可以记录大量有关后续岩浆和变质事件的有用和额外信息，这使其成为锆石的补充矿物，以揭示完整的地质历史。在这篇论文中，我们对采集自苏水岩群的锆石和金红石晶粒进行了 LA-ICP-MS U-Pb 定年。两个三迭纪片麻岩样本中的锆石得出的结晶年龄分别为 2520 和 2509 Ma。样品中的金红石颗粒分别给出了 1937、1840 和 1811 Ma 的变质年龄。云母片岩样本记录的两组金红石 U-Pb 年龄分别为 1924 和 1832 Ma。锆石U-Pb年代测定显示，单斜长花岗岩样本成岩于2300Ma，样本中的金红石的年代从2079Ma到1715Ma不等，主峰年代为1820Ma。苏水岩群的金红石 U-Pb 年龄显示了两个不同的变质阶段。1937-1924Ma时期与变质高峰期相吻合；而随后的1840-1811Ma时期则表明了与中条山基底掘起相关的冷却时代。现有研究表明，苏水复合体在国家地质公园的最终组装过程中经历了古近纪变质作用。此外，我们的研究还提供了一个很好的例子，说明金红石U-Pb定年是揭示前寒武纪变质地层晚期构造热事件的重要地质年代工具。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Precambrian Research 地学-地球科学综合

CiteScore

7.20

自引率

28.90%

发文量

325

审稿时长

12 months

期刊介绍： Precambrian Research publishes studies on all aspects of the early stages of the composition, structure and evolution of the Earth and its planetary neighbours. With a focus on process-oriented and comparative studies, it covers, but is not restricted to, subjects such as: (1) Chemical, biological, biochemical and cosmochemical evolution; the origin of life; the evolution of the oceans and atmosphere; the early fossil record; palaeobiology; (2) Geochronology and isotope and elemental geochemistry; (3) Precambrian mineral deposits; (4) Geophysical aspects of the early Earth and Precambrian terrains; (5) Nature, formation and evolution of the Precambrian lithosphere and mantle including magmatic, depositional, metamorphic and tectonic processes. In addition, the editors particularly welcome integrated process-oriented studies that involve a combination of the above fields and comparative studies that demonstrate the effect of Precambrian evolution on Phanerozoic earth system processes. Regional and localised studies of Precambrian phenomena are considered appropriate only when the detail and quality allow illustration of a wider process, or when significant gaps in basic knowledge of a particular area can be filled.