扬子克拉通北缘中元古代神农架群构造属性:来自碎屑锆石U⁃Pb年代学的约束
卢山松 , 童喜润 , 吴年文 , 江拓 , 王志先 , 周涛 , 王江 , 邱啸飞
地球科学 ›› 2025, Vol. 50 ›› Issue (07) : 2613 -2627.
扬子克拉通北缘中元古代神农架群构造属性:来自碎屑锆石U⁃Pb年代学的约束
Mesoproterozoic Tectonic Characteristics of Shennongjia Group in Northern Margin of Yangtze Craton: Constraints from Detrital Zircon U⁃Pb Geochronology
,
为了解扬子克拉通北缘中元古代地质构造演化过程,对扬子克拉通北缘神农架群矿石山组、石槽河组、台子组沉积地层进行了碎屑锆石U-Pb年龄分析.结果显示,神农架群碎屑锆石的峰值年龄在~1.60 Ga、2.00~2.10 Ga和2.50~ 2.70 Ga,同时还存在少量2.20~2.30 Ga和>2.80 Ga锆石年龄.碎屑锆石年龄谱的结果显示神农架群的沉积时限应为1.10~1.60 Ga.通过对比扬子克拉通中元古代地层和扬子陆核区碎屑锆石年龄谱,扬子克拉通西缘和北缘总体不具有相似的年龄分布特征,指示二者在中元古代可能具有相对独立的构造演化过程;神农架群和打鼓石群具有相似的年龄分布,但二者在1.40~1.60 Ga期间不同的锆石年龄峰值指示二者在中元古代可能经历了不同的演化过程.结合前人的研究资料,扬子克拉通在中元古代之前可能呈现为多个相互独立的陆块,并在古元古代‒中元古代的构造演化过程中先后拼合到扬子克拉通基底中.
To understand the Mesoproterozoic geotectonic evolution of the northern margin of the Yangtze Craton, the U-Pb dating of detrital zircons from the sedimentary strata of the Kuangshishan, Shicaohe, and Taizi formations within the Shennongjia Group has been conducted. The results reveal prominent detrital zircon age peaks at ~1.60 Ga, 2.00-2.10 Ga, and 2.50- 2.70 Ga, with minor populations at 2.20-2.30 Ga and rare zircons older than 2.80 Ga. The age distributions suggest that the Shennongjia Group was deposited between 1.10 and 1.60 Ga.Comparative analysis of detrital zircon age spectra from Mesoproterozoic strata across the Yangtze Craton and its continental nucleus indicates distinct age distributions between the western and northern margins, implying relatively independent tectonic evolutionary processes during the Mesoproterozoic. While the Shennongjia Group and the Dagushi Group exhibit similar age spectra, their differing peak ages in the 1.40-1.60 Ga interval suggest divergent evolutionary histories during this period. Integrating the findings with those of the previous studies, we propose that the Yangtze Craton likely comprised multiple independent microcontinents before the Mesoproterozoic, which were progressively amalgamated into the cratonic basement during Paleoproterozoic to Mesoproterozoic tectonic events.
神农架群 / 碎屑锆石 / U⁃Pb年龄 / 中元古代 / 扬子克拉通 / 地质年代学.
Shennongjia Group / detrital zircon / U⁃Pb age / Mesoproterozoic / Yangtze Craton / geochronology
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国家自然科学基金项目(42272229)
国家自然科学基金项目(U2344210)
国家自然科学基金项目(41303026)
古生物与地质环境演化湖北省重点实验室开放研究基金项目(PEL⁃202205)
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