Revisiting Ediacaran to early Cambrian depositional history of the western North China: Did it remain passive until mid-Paleozoic?

Jiaopeng Sun, Yunpeng Dong, Qiang Chen, Yao Ma
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Abstract

Whether the North China Block (NCB) remained extension from its cratonization to mid-Paleozoic is questionable. Here, we conducted a synthesis of zircon U-Pb data of Statherian–Ordovician sandstones to make a historical review of provenance changes in the western NCB through time. In contrast to typical NCB basement sources characterized by ca. 2.7–1.8 Ga ages with spectral peaks at ca. 2.5 and 1.9 Ga during much of ca. 1.8–0.45 Ga, Ediacaran to Cambrian Stage 3 succussions contain abundant zircons with Meso- to Neoproterozoic ages. The exotic provenance, further verified by southeastward paleo-flow, implies sources from the western Bainaimiao arc terrane (BAT), where basement rocks with suitable ages exist. Hence, the BAT should evolve at the NCB margin before ca. 0.56 Ga, but after rifting of the NCB (until ca. 773 Ma). This event led to a craton-wide stratigraphic break intervening Mesoproterozoic–Ediacaran. Presence of 521–515 Ma detrital zircons in the Cambrian Stage 3 strata indicates subduction onset of the Paleo-Asian Ocean before ca. 515 Ma, coincident with the Precambrian-Cambrian boundary paraconformity. A sequence of depositional shifts triggered by tectonic activities of the BAT unveil a complicated plate re-organization history of the northern NCB, contesting the NCB remained passive from Statherian. Supplementary material: https://doi.org/10.6084/m9.figshare.c.7040743
重新审视华北西部埃迪卡拉至寒武纪早期的沉积历史:直到古生代中期,华北西部仍处于被动状态吗?
华北地块从克拉通化到古生代中期是否一直保持延伸是一个疑问。在此,我们综合了石炭系-奥陶系砂岩的锆石U-Pb数据,对华北地块西部的成因变化进行了历史回顾。与典型的NCB基底来源不同,埃迪卡拉纪至寒武纪第三阶段的淤积物含有大量中生代至新元古代年龄的锆石,其特征是年龄约为2.7-1.8 Ga,在约1.8-0.45 Ga的大部分时间里光谱峰值约为2.5和1.9 Ga。东南向古生物流进一步验证了这一奇特的来源,这意味着其来源于白庙弧地层(BAT)西部,那里存在具有合适年龄的基底岩石。因此,白庙弧地层应在约0.56 Ga之前在NCB边缘演化,但在r.因此,白庙弧地层应在北大西洋滩边缘演化,演化时间早于约 0.56 Ga,但在北大西洋滩断裂之后(直到约 773 Ma)。这一事件导致了中新生代-二迭纪之间的地层断裂。寒武纪第3阶段地层中存在的521-515Ma的碎屑锆石表明,古亚洲洋的俯冲开始于约515Ma之前,与中生代-始新世相吻合。515Ma,与前寒武纪-寒武纪边界准震旦纪相吻合。BAT构造活动引发的一系列沉积变迁揭示了北寒武纪北部复杂的板块重组历史,质疑了北寒武纪自石炭纪以来一直处于被动状态。 补充材料:https://doi.org/10.6084/m9.figshare.c.7040743
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