Abstract：This paper studied the magnetostratigraphy,14C dating,sedimentary cycle,logging sedimentary,pollenstratigraphy and microbiota ostracoda in Borehole TD1,which is located at the middle part ofLuanhe River fluvial fan of the early Late Pleistocene on the northwestern coast of Bohai Bay. The results show that:(1)The strata with 220m thinkness in this borehole recorded the palaeomagnetic Brunhes,Matuyama and Gauss polarity chrons,and the bottom horizon was near 3.45 Ma based on the palaeomagnetic polarity column. (2)The stratigraphy architecture of fluvial fan had been drilled,it was composed of branch channel facies and related sediments in braided river system since Quaternary,and the thickest limnetic facies sediment appeared in Pliocene. (3)The analysis of the log facies and sedimentary facies for the borehole suggests that a total of six large sedimentary cycles occurred since circa 3.45 Ma,it can be compared in depth with the borehole that at the head of Luanhe River fluvial fan. The sedimentary cycles happened at 3.2,3.0,2.0 and 0.78 Ma respectively overlaid the four stages of lake-limnetic facies sediments. The light yellow/orange sediments in the Latest Glacial Maximum Stage is the same with those found in boreholes on the western coast of Bohai Bay,conforming to the sedimentary characteristic of lowstand system trace. (4)The palaeo-monsoon could lead to the increase in precipitation and formation of lacustrine sediments,however,in this borehole,the highest organic matter content occurred at 6 ka BP,which shows that the hydrothermal condition had been influenced by the Middle Holocene megathermal period climate greatly.
Hu Yunzhuang,Zhang Jinqi,Bai Yaonan et al. Records of regional tectonic and climatic evolution since 3.45 Ma BP at Borehole TD1 of Tangshan in the middle part of Luanhe River fluvial fan[J]. JOPC, 2014, 16(2): 249-262.
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