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Late Cretaceous-Cenozoic cooling of the southern Lower Yangtze River area: A response to subduction of the Izanagi and Pacific plates

2021; Elsevier BV; Volume: 102; Linguagem: Inglês

10.1016/j.gr.2021.02.016

1878-0571

Pengcheng Wang, Yanhui Suo, Xianzhi Cao, Junjiang Zhu, Bo Liu, Guangzeng Wang, Jie Zhou, Xiyao Li, Sanzhong Li, Gege Hui,

High-pressure geophysics and materials

Late Cretaceous-Cenozoic large-scale extension in the eastern South China Block (SCB) has been widely studied. While the exact timing is not well constrained and the geodynamics is inconclusive. Here, we studied the cooling and uplifting history of the southern Lower Yangtze River area (LYRA) in the northeastern SCB using the fission track chronology. The apatite fission track (AFT) single grain ages are decomposed into two best-fit age peaks during 80–50.2 Ma and 43.7–34.5 Ma, respectively. The thermal history modeling of apatite reveals that there exists a rapid cooling process during ca. 80–50 Ma, a slow cooling process during ca. 50–35 Ma and another rapid cooling process during ca. 35–12 Ma. The 80–50.2 Ma age peak corresponds to the rapid cooling process during ca. 80–50 Ma, and the 43.7–34.5 Ma age peaks roughly correspond to the slow cooling process during ca. 50–35 Ma. The tectonic analysis shows that the rapid cooling stage during ca. 80–50 Ma, linked to the rapid rifting in the southern LYRA and coeval strong rifting in the northern LYRA, has resulted from flat subduction of young oceanic crust of the Izanagi Plate. The slow cooling stage during ca. 50–35 Ma is linked to the subduction of the Izanagi-Pacific spreading ridge. The another rapid cooling stage during ca. 35–12 Ma corresponds to a rapid uplifting of the southern LYRA, resulted from the regional compression and tectonic inversion in East China.