Middle Pleistocene stratigraphic hiatus on the Cangxian Uplift,the west coast of Bohai Bay
Lu Qing-Wei1, Wang Qiang2, Zhan Jian1, Guo Wei1, Li Wen3, Wang Xi-Yu1
1 Geological Institute of North China Geological Exploration Bureau of Tianjin,Tianjin 300170; 2 Tianjin Center of Geological Survey,China Geological Survey (CGS),Tianjin 300170; 3 Marine Geological Survey Center of Tianjin,Tianjin 300170
Abstract：This study examined core materials of the Borehole CGZ5 with 400m depth in Jinghai County and Borehole TPZ1 with 500m depth in Dagang district of southern Tianjin plain on the west coastal plain of Bohai Bay. Based on analyses of lithology,magnetostratigraphy,14C dating,micropaleontology,the present paper determined that the bottom of the two boreholes arrived at the upper parts of the Gauss and Gilbert polarity zones dated 3.6Ma and 4.5Ma,respectively. The palaeomagnetotizm boundary of Matuyama/Gauss(M/G)polarity zone dated 2.58Ma occurred at 225m and 208m in the Borehole CGZ5 on the western Cangxian Uplift and in the Borehole TPZ1 on the west slope of the eastern Huanghua Depression,respectively. In the two boreholes mentioned above,the boundary of Brunhes/Matuyama(B/M)polarity zone representing 0.78Ma occurred at 55m and 68.6m,respectively. Combining with analyses of microfossils and determination of three transgression beds,as well as lithological characteristics,the bottom of the Upper Pleistocene series was estimated to be located at depths of 55m and 63.4m in the two studied boreholes. Based on the low waterlevel redoxing clay horizon of LGM(Last Glacial Maximum),the thickness of Holocene series was determined to be 14.8m and 16.5m,respectively. The boundaries of B/M and M/G of the CQJ4 borehole,located between the two boreholes(CGZ5/TPZ1)and at the main Banqiao sag of Huanghua Depression,occurred at 74m and 340m,respectively. The absence of the entire Middle Pleistocene series was observed in the western Borehole CGZ5,whereas the thickness at the eastern Borehole TPZ1 is only 5.3m. It was speculated that this stratal hiatus was caused by the fastly fault-controlled deposition in the preliminary stage of Middle Pleistocene in the Bohai Sea basin. Under the setting of large elevation difference,the significantly high amount of sediments supplied by the rivers flowing into the sea resulted in sediment bypass on the marginal Cangxian Uplift and adjacent coastal plains. For the great east plain of China formed during the palaeogeographic changes of the “Source to Sink”system,the dynamic sedimentary setting during the Middle Pleistocene epoch needs to be further studied.
Lu Qing-Wei,Wang Qiang,Zhan Jian et al. Middle Pleistocene stratigraphic hiatus on the Cangxian Uplift,the west coast of Bohai Bay[J]. JOPC, 2018, 20(4): 665-679.
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