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Geochemistry and detrital zircon records of the Ruyang-Luoyu groups, southern North China Craton: Provenance, crustal evolution and Paleo–Mesoproterozoic tectonic implications
Geoscience Frontiers ( IF 8.9 ) Pub Date : 2019-09-07 , DOI: 10.1016/j.gsf.2019.08.003
Xi-Yao Li , Sanzhong Li , Tong-Shan Wang , Yunpeng Dong , Xiao-Guang Liu , Shu-Juan Zhao , Kun Wang , Jiao-Peng Sun , Li-Ming Dai , Yan-Hui Suo

Paleo- to Mesoproterozoic sedimentary rocks in the southern margin of the North China Craton (NCC) are represented by the Ruyang and Luoyu groups. We studied the sedimentary rocks from the Yunmengshan and Beidajian formations of the Ruyang Group and the Cuizhuang and Sanjiaotang formations of the Luoyu Group. Detrital zircon grains from these formations have U–Pb age populations of 3.64–3.31 ​Ga, 2.96–2.86 ​Ga, 2.72–2.59 ​Ga, 2.56–2.47 ​Ga, 2.45–2.0 ​Ga, 1.99–1.85 ​Ga and 1.84–1.65 ​Ga. The geochemical features of the sedimentary rocks suggest that some of the sediments were sourced from intermediate to felsic magmatic rocks. The age groups of the detrital zircon are roughly consistent with the tectono-thermal events in the southern margin of the NCC. The Hf isotopic compositions of detrital zircon from the sedimentary rocks in Ruyang and Luoyu groups suggest that significant crustal growth and reworking of the NCC took place during the Neoarchean and early- to mid-Paleoproterozoic, while crustal reworking at the Paleoarchean and late-Paleoproterozoic, and crustal growth at the Mesoarchean. We suggest the depositional times of the Ruyang Group and Luoyu Group are constrained to no older than 1.75–1.7 ​Ga and 1.7–1.65 ​Ga, respectively. Formation of late-Paleoproterozoic basins related to the strike slip and extrusion tectonics that cross-cut the NCC during the late Paleoproterozoic (<1.75 ​Ga), and the late Paleoproterozoic sedimentation once isochronous developed in the southern margin of the NCC through the Taihang region of the interior NCC and linked the Yanshan–Liaoxi regions of the northern NCC.



中文翻译:

华北克拉通南部汝阳—罗育组的地球化学和碎屑锆石记录:物源,地壳演化和古元古生代构造意义

华北克拉通(NCC)南部边缘的古生代至中元古代沉积岩以如阳组和洛榆组为代表。我们研究了汝阳组云梦山和北大尖尖组的沉积岩,以及洛榆组的崔庄和三角塘组的沉积岩。这些地层的碎屑锆石晶粒年龄为3.64–3.31 Ga,2.96–2.86 Ga,2.72–2.59 Ga,2.56–2.47 Ga,2.45–2.0 Ga,1.99–1.85 Ga和1.84 –1.65镓 沉积岩的地球化学特征表明,某些沉积物是从中型到长英质岩浆岩中获得的。碎屑锆石的年龄组大致与NCC南部边缘的构造热事件一致。汝阳组和洛豫组沉积岩碎屑锆石的Hf同位素组成表明,新古生代和古古生代早,中古生代发生了NCC的显着地壳生长和返工,而古古生代和古古生代末期,地壳返工和Mesoarchean的地壳生长。我们建议将汝阳组和洛玉组的沉积时间分别限制在不超过1.75–1.7 Ga和1.7–1.65 Ga。晚古生代盆地的形成与晚古元古代(<1.75 Ga)贯穿NCC的走滑和挤压构造有关,

更新日期:2019-09-07
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