燕辽裂陷槽基底陆壳生长事件——来自长城系碎屑锆石U-Pb-Hf同位素的启示
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1.中国石油大学(北京)地球科学学院;2.国石油大学北京地球科学学院;3.油气资源与探测国家重点实验室中国石油大学北京;4.中国石油大学北京地球科学学院

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国家自然科学基金项目(Nos. 2462018YJRC030, 2462020YXZZ020)


Multiple phases of continental crustal growth of the basement of the Yanliao intracontinental rift: Constraint on the detrital zircon U-Pb-Hf isotopes of the sediments of Changcheng Group
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College of Geosciences, China University of Petroleum (Beijing)

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    摘要:

    华北克拉通大陆地壳生长目前已经有大量研究,但对于被巨厚沉积盖层覆盖的燕辽裂陷槽基底地壳生长的问题前人讨论较少。本文以燕辽裂陷槽基底之上的长城系沉积岩为研究对象,统计了燕辽裂陷槽内长城系地层中碎屑锆石年龄频谱和Lu-Hf同位素数据,探讨长城系地层沉积年龄、碎屑锆石沉积源区和地壳生长事件等科学问题。燕辽裂陷槽长城系沉积年龄为1680 Ma。燕辽裂陷槽长城系碎屑锆石年龄频谱主要显示为2.7–2.5 Ga和2.2–1.9 Ga两个阶段,Hf同位素εHf(t)表现为高的正值区间+0.1~+34.6。通过对比长城系碎屑锆石与华北克拉通结晶基底的U-Pb定年、Lu-Hf同位素εHf(t)和TDM2模式年龄数据,推测燕辽裂陷槽长城系沉积物源为燕辽裂陷槽下伏基底。结合碎屑锆石U-Pb定年、εHf(t)值和TDM2模式年龄数据,我们认为华北克拉通中元古代前地壳生长有三个峰值,分别为2.7~2.5Ga,2.2~1.9 Ga和1.7~1.6Ga。

    Abstract:

    The continental crustal growth of the North China Craton has been extensively studied. However, there has been limited discussions regarding the crustal growth of the Yanshan-Liaoning Rift Basin, which is covered by thick sediments. In this study, we focuse on sedimentary rocks of the Changcheng Group overling the Yanliao intracontinental rift and investigate scientific issues such as sedimentary age, provenance of detrital zircons and crustal growth events by analyzing the age spectrum and Lu-Hf isotope data of detrital zircons of the sediments within the Changcheng Group of the Yanliao intracontinental rift. U-Pb isotopic ages constrain the timing of initiation of the Yanliao rift as ca. 1680 Ma. The zircon U-Pb data show two major age populations at 2.7–2.5 Ga and 2.2–1.9 Ga, with high and positive eHf(t) values of + 0.1 to + 34.6. By comparing the U-Pb dating, Lu-Hf isotope εHf(t) and TDM2 model age data of detrital zircons from the Changcheng Group with those of the crystalline basement in the North China Craton, it can be inferred that the sedimentary source of the Changcheng Sediments in the Yanliao intracontinental rift originated from the underlying basement of the Yanliao intracontinental rift. Based on the comprehensive analysis of detrital zircon U-Pb dating, εHf(t) values, and TDM2 model age data, it is suggested that the North China Craton experienced three peaks in its Mesoproterozoic pre-crustal growth history, which occurred at approximately 2.7–2.5 Ga, 2.2–1.9 Ga and 1.7–1.6 Ga.

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  • 收稿日期:2023-07-19
  • 最后修改日期:2023-11-14
  • 录用日期:2023-11-29
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