A typical borehole P5 was examined for lithology, dating, sporepollen and microfossil to reveal the phases of climate and sea level fluctuation and the associated sedimentary facies recorded in the paleoincised valley sediments in the southeastern Changjiang Delta Plain since the last deglaciation.The results show that freshwater marsh facies prevailed in the paleoincised valley during 15～10 ka BP.A peat layer, 4 m thick, evidenced the cooling event of Younger Dryers. Coastal silty sand and silt dominated the strata of paleoincised valley, reflecting the relatively stable sea level during 10～9 ka BP. Muddy silt and silty mud was 11 m thick during 9～8 ka BP, reflecting the quick deposition in the drowned valley due to the rapid rise of sea level. The deposition surface of the valley approximated to the buried depth of stiff muds in the delta plain at the beginning of the Holocene optimum, indicating the termination of filling in the paleoincised valley.
About author: Zhao Baocheng, born in 1981, is a candidate for masters degree, and now is engaged in Quaternary environmental evolution.Email:zbch.com@tom.com.
Cite this article:
. Characteristics and palaeogeographic significance of paleoincisedvalley sediments in southern Changjiang Delta Plain[J]. JOURNAL OF PALAEOGEOGRAPHY, 2007, 9(2): 217-226.
. Characteristics and palaeogeographic significance of paleoincisedvalley sediments in southern Changjiang Delta Plain[J]. JOPC, 2007, 9(2): 217-226.
