Seismic events, sequences and structural significance of the Canglangpu period in the ancient Tanlu belt

Seismic Event, Sequence and Tectonic Significance in Canglangpu Stage in Paleo-Tanlu Zone

Qiao Xiufu, Gao Linzhi, Pengyang Li Haibing

Original article published in China in 2001 Science (Series D) Volume 31, Issue 11, English version published in Science in China, Vo L45 No. 9, 2002. Using seismic disaster records and sequence stratigraphy (third-level sequence) to discuss whether there was a large translation of the Tanlu fault in the Mesozoic. Figure 3 of the printed text in the current issue has been replaced with a color photo. Chapter 14 (the next chapter of this book) is the latest summary of the research on the Dalinzi Formation in recent years, with many new insights. Some pictures in Chapter 13 overlap with those in Chapter 14. In order to maintain the original historical appearance and the understanding at that time, the pictures and explanations in Chapter 13 have not been deleted.

The Lower Cambrian Canglangpu Stage in the Jiaoliao-Xhuai area is distributed along both sides of the Tanlu fault. The Canglangpu Stage in the Liaodong Peninsula includes the Gejiatun Formation, Dalinzi Formation and Jianchang Formation (located on the east side of the Tanlu fault). The Dalinzi Formation was formed in the coastal Sabha environment. The entire rock formation is full of records of earthquake disaster events. It is characterized by liquefaction drainage veins, hydroplastic folds, hydroplastic micro-faults (all three are associated), liquefaction curling deformation, liquefaction angles Conglomerate and sandstone walls; summarized seismic liquefaction sequences in Sabha mudstones. The Canglangpu Stage in northern Jiangsu and Anhui (located on the west side of the Tanlu fault) includes the Jinshanzhai Formation and the lower and upper members of the Gouhou Formation. The Gouhou Formation is also deposited in an arid lagoon environment and is in the same climate zone as the Dalinzi Formation. However, no earthquake event records have been found in the Canglangpujie Rock Formation in northern Jiangsu and Anhui. Four sequences can be identified in the Canglangpu Stage in northern Jiangsu and Anhui, but one sequence is missing in the Liaodong Peninsula. From the perspective of catastrophic events, sequence stratigraphy and specific rock group lithology comparisons, the view that the Canglangpu Stage System in the Liaodong Peninsula moved hundreds of kilometers from northern Jiangsu and Anhui to its current position in the Mesozoic Era is not supported.

The ancient Tanlu belt (Figure 1) refers to southern Jilin, Liaodong Peninsula, central Shandong Peninsula and northern Jiangsu and Anhui. It is located in the eastern part of the Sino-Korean plate and is a strong intraplate seismic zone in the Neoproterozoic. Its development time It is from the Sinian to the early Late Carboniferous.

Liquefaction curl deformation and liquefaction breccia Liquefaction curl deformation refers to the curl formed by liquefaction in the layer (Figure 3D). It is a kind of water-plastic deformation that is actually divided into two stages. The lower section is a salt-bearing section of red clastic rocks in an arid environment. The lower part of the section is interbedded with thin layers of sandy shale and sandstone, and the upper part is a middle layer of gravelly sandstone and sandstone. The layers are widely developed with abundant halite pseudomorphs and mud cracks. The lower section of the Gouhou Formation is an arid climate zone barrier lagoon environment. This arid zone extends from northern Jiangsu and Anhui to the north to Shandong and directly to Liaodong (Dalinzi Formation) and southern Jilin (Heigouzi Formation). Then the pre-Cretaceous strata of the Liaodong Peninsula , including the Canglangpu steps involved in this article, are all off-site systems. They traveled long distances by left-hand sliding from Jiangsu and Anhui to their current location. However, according to the research in this article, the current records of the Canglangpujie Rock Formation contradict the view of giant translation.

(1) The strong earthquake records that are very developed in the Dalinzi Formation of the Liaoning Peninsula have not been found in the Canglangpu Step in northern Jiangsu and Anhui to the west of the Tanlu Fault. In Figure 1, ① is located on the east side of the Liaodong Peninsula, on the coast of the Yellow Sea. Canglangpuji earthquake records are also distributed on the Bohai Sea coast on the west side of the peninsula. If the Liaodong Peninsula is moved south to the latitude of ⑤ in Figure 1, the distance between the two is only 50 to 70 km. The scope of sediment liquefaction during the strong earthquake in the Canglangpu period of the Early Cambrian should completely involve two areas. However, there are no strong earthquake records in Canglangpujie in northern Jiangsu and Anhui, indicating that they were not in the same geographical location at that time.

(2) The Canglangpu Step in Liaodong Peninsula has one less sequence than that in northern Jiangsu and Anhui. The third-level sequence has large regional isochronic correlation significance. The lack of DS3 in the Liaodong Peninsula indicates that there was regional tectonic uplift in the Liaodong Peninsula after the Canglangpa period DS2. This uplift did not affect northern Jiangsu and Anhui, indicating that the geographical location of the two at that time The locations are far apart.

(3) The lithology and lithofacies of the Gejiatun Formation, Dalinzi Formation, Jianchang Formation and the three formations in northern Jiangsu and Anhui are quite different (Fig. 2).

4 Conclusion

The above three points indicate that the Canglangpu Stage in southern Liaoning and the Canglangpu Stage in northern Jiangsu and Anhui (located to the west of the Tanlu Fault) are Side) were not in the same geographical location at that time. The Canglang Pagoda in Liaodong Peninsula could not be the result of translation from northern Jiangsu and Anhui. The seismic catastrophic events of the Canglangpu Stage and the objective geological records of sequence stratigraphy do not yet support the huge translation of the Tanlu fault; nor does it support that the Canglangpu Stage of the Liaodong Peninsula was a huge translation from northern Jiangsu and Anhui during the Late Jurassic or Early Cretaceous. point of view to the present position.

The current distribution of the Canglangpu Stage in the Liaodong Peninsula and northern Jiangsu and Anhui is in the NNE direction (Figure 1). Since they were formed under arid and semi-arid hot conditions, they were probably formed in the Early Cambrian Canglang Puqi is an EW-trending basin parallel to the bottom of low latitudes. The Canglangpu steps in northern Jiangsu and Anhui and in eastern Liaoning are located at both ends of the basin.

References

[1] Qiao Xiufu, Song Tianrui, Gao Linzhi, et al. Carbonate rock vibration liquefaction earthquake sequence. Acta Geologica Sinica, 1994, 68(1):16～ 34

[2] Qiao Xiufu, Song Tianrui, Li Haibing, et al. Sinian-Lower Cambrian genetic strata in the southern Liaodong Peninsula. Beijing: Science Press, 1996, 1～173

[3] Qiao Xiufu, Li Haibing, Gao Linzhi. Sinian-Early Paleozoic earthquake rhythm in the North China Platform. Frontiers of Earth Science, 1997, 4(3): 155～160

[4 ] Qiao Xiufu, Gao Linzhi. Mid-Neoproterozoic earthquake disaster events in North China and their relationship with Rodinia. Science Bulletin, 1999, 44(16): 1753～1757

[5] Xiang Liwen, Zhu Zhaoling, Li Shanji , et al. Cambrian. Beijing: Geological Press, 1999, 1～95

[6] Plaziat J C, Pruser B H, Philobbos E. Seismic deformation structure (seismites in the syn-rift sedi-ments of the NW Red Sea Egypt). Bull Soc Geol France, 1990, (8): 419～439

[7] Liu Ying, Xie Junfei. Sand vibration liquefaction. Beijing: Earthquake Press, 1989.1～ 327

[8] Feng Xianyue. Research on liquefaction deformation due to earthquake vibration. Inland Earthquake, 1989, 3(4): 209～307

[9] Xing Yusheng, Gao Zhenjia, Wang Ziqiang , et al. Dictionary of Chinese Stratigraphy, Neoproterozoic. Beijing: Geological Press, 1999, 1～118

[10] Gao Zhenjia, Chen Keqiang, Wei Jiayong. Chinese Dictionary of Lithostratigraphy. Wuhan: China University of Geosciences Publishing Society, 2000, 1～628

[11] Xu Jiawei. Cambrian sedimentation of Huainan. Journal of Hefei Mining Institute, 1956, (1): 22～24

[12] Xu Jiawei .Translational movement of the Tancheng-Lujiang Deep Fault Zone. East China Geology, 1964, (5): 18～31

[13] Xu Jiawei. On the translational movement of the Tancheng-Lujiang Deep Fault Zone and its geological and ore prospecting significance . Geological and Mineral Research, 1978, (5): 1～30

[14] Xu Jiawei. Translational movement of the Tanlu Fault Zone and its geological significance. See: International Exchange Geological Academic Papers (1). Beijing: Geology Press, 1980.129～142

[15] Xu Jiawei. Cui Kerui, Liu Qing, et al. Mesozoic sinistral translational faulting in the East Asian continental margin. Marine Geology and Quaternary Geology, 1985, 5 (2): 51～64

[16] Xu Jiawei, Zhu Guang, Lu Peiji, et al. Progress in translational chronology of the Tanlu fault zone. Anhui Geology, 1995, 5(1): 1～12

[17]Xu Jiawei. Re-discussing the maximum translational amplitude of the Tanlu Fault Zone—Comparison of the Western Shandong-Northern Liaoning Block. Journal of the Shenyang Institute of Geology and Mineral Resources, Chinese Academy of Geological Sciences, 1994, (3) :43～55

[18]Xu J W, Zhu G. Tectonic models of the Tan-Lu Fault Zone, eastern China. International Geology Review, 1994, 36: 771～784

[19]Xu J W.The Epi-continental area of ??Southeast China and relevant earthquakes.Ac ta Seismologica Sinica,1996,9(4):566～571

[20]Deng Naigong. Mesozoic Chinese type Characteristics and formation mechanism of the structure and Tanlu fault system. See: Structural Geology Series (3). Beijing: Geology Press, 1984.33-38

[21] Ma Xingyuan. Lithosphere Dynamics of China and Adjacent Seas Academic Atlas. Beijing: Geology Press, 1986

[22] Xu Zhiqin. Large-scale deep detachment structure and dynamic analysis on the northern margin of the Yangtze Plate. China Regional Geology, 1987, 6(4): 289~ 300

[23] Xu Shutong, Chen Guanzheng, Tao Zheng. Geological structure pattern and formation background of Xuhuai area in eastern China. Beijing: Geology Press, 1993, 1～71

[ 24] Wan Tianfeng. Formation and Evolution of the Tancheng-Lujiang Fault Zone. Wuhan: China Univer-sity of Geosciences Press, 1996.1～85

[25] Zhu Guang, Xu Jiawei. Tancheng-Lujiang Fault Zone and For the tectonic relationship of the Dabie-Jiaonan Orogenic Belt, see: Ma Zongya, Yang Zhuen, Wu Zhengwen, editors-in-chief. Structural Geology—Research Progress in Lithosphere Dynamics. Beijing: Earthquake Press, 1999, 164～169

[26] Liu Hefu, Xia Yiping, Yin Jinyin, et al. Coupling mechanism of strike-slip orogenic belts and basins. Geoscience Frontiers, 1999, 6(3): 121～132

[27] Wang Xiaofeng, Li Zhongjian, Chen Bolin, et al. Tanlu fault zone. Beijing: Geological Press, 2000, 1～374

[28]Okay A I, Sengor A M C. Evidence for intracontinental thrust related exhumation of the ultra- High-pressure rocks in China. Geology, 1992, 20: 411～414

[29] Xu Xuesi. Unified division of Xuhuai and Jiaoliao Sinian subboundaries and translation of Tanlu fault. Chinese Academy of Geological Sciences Journal of Tianjin Institute of Geology and Mineral Resources, 1981, (3) 83～102

[30] Chen Rongdu. Discussing the translational movement of the Tanlu fault based on the geological comparison between eastern and western Liaoning. Liaoning Geology, 1995, (3 ):184～193

[31] Zhu Guang, Song Chuanzhong, Wang Daoxuan, et al. 40Ar/39Ar geochronological study of the slippage era of the Tanlu fault zone and its tectonic significance. Chinese Science, Series D, 2001,31(3):250～256