Abstract
The Dasanjiang basin group in Northeast China contains more than ten Mesozoic–Cenozoic sedimentary basins. Much evidence shows that they were a unified large-scale depression lacustrine basin in the Early Cretaceous; however, destruction processes and mechanisms after the formation of the unified lacustrine basin are some of the key issues restricting basic research and oil and gas exploration in the Dasanjiang area. In this study, we carried out low-temperature thermochronology and thermal history inversion on samples from the main basins in the Dasanjiang area to finely restore the destruction process of the unified basin. The results show that since the Early Cretaceous, the Dasanjiang area has experienced three major positive tectonic inversions: 100 Ma~90 Ma, 73 Ma~40 Ma, and 23 Ma~5 Ma. The unified basin was destroyed by compression and uplift and gradually disintegrated. The basin gradually changed from initial unified evolution to differential evolution and finally formed the isolated appearance of each basin. The aforementioned three-stage positive tectonic inversion time limits basically corresponded to the changing periods in the movement direction, subduction angle, and movement speed of the paleo–Pacific Ocean plate. It is believed that the movement and reorganization events of the plates on the Pacific side dominated the formation, destruction, and disintegration of the Dasanjiang prototype basin, which was the main dynamic mechanism of the tectonic evolution of the Mesozoic and Cenozoic basins in the study area and Northeast China.
Highlights
The Dasanjiang basin group is located in the eastern part of Heilongjiang Province, China, and includes Sanjiang, Boli, Jixi, Hulin, and other Mesozoic–Cenozoic sedimentary basins
This study focuses on the tectonic evolutionary process of the destruction of the unified lacustrine basin formed by the Chengzihe Formation and Muling Formation in the Early Cretaceous
We quantitatively restored the thermal history of the Dasanjiang area since the Cretaceous in Northeast China by using apatite fission track analysis and determined the time, period, and amplitude of tectonic activities experienced by the Dasanjiang unified basin
Summary
The Dasanjiang basin group is located in the eastern part of Heilongjiang Province, China, and includes Sanjiang, Boli, Jixi, Hulin, and other Mesozoic–Cenozoic sedimentary basins. Some scholars have studied the nature of basin boundary faults, the time limit of volcanic activity in the basin, and the coupling relationship between uplift and subsidence. They have believed that these basins were a series of independent extensional fault basin groups in the Early Cretaceous (Liu et al, 2000; Zhang et al, 2004; Liu et al, 2011; Cao et al, 2013). Other scholars have tended to consider that the currently divided basins were a unified large-scale depression basin during the Early Cretaceous through the study of sedimentary facies, paleocurrent, heavy minerals, and earthquakes (He, 2006; Wen et al, 2008; Jia and Zheng, 2010; Fang et al, 2012; Xu et al, 2013; Zhang et al, 2016) and that they need to be studied as a whole
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