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WANG Li-bo, LI Jun, CHEN Zheng-xing, ZHAO Jing-tao, BAI Feng-long, HU Bang-qi, DOU Yan-guang, ZHAI Bin. Late Pleistocene and Holocene Stratigraphy and Paleo- environmental Evolution in the Western Taiwan Shoal[J]. Acta Sedimentologica Sinica, 2014, 32(6): 1089-1099.
Citation: WANG Li-bo, LI Jun, CHEN Zheng-xing, ZHAO Jing-tao, BAI Feng-long, HU Bang-qi, DOU Yan-guang, ZHAI Bin. Late Pleistocene and Holocene Stratigraphy and Paleo- environmental Evolution in the Western Taiwan Shoal[J]. Acta Sedimentologica Sinica, 2014, 32(6): 1089-1099.

Late Pleistocene and Holocene Stratigraphy and Paleo- environmental Evolution in the Western Taiwan Shoal

  • Received Date: 2013-08-20
  • Rev Recd Date: 2014-04-04
  • Publish Date: 2014-12-10
  • Sediment core and high-resolution subbottom profiles from the western Taiwan Shoal were analyzed to research stratigraphic sequence, paleo-environmental development of the Shoal. According to the analyses of sedimentary characteristics, grain-sizes and AMS 14C dating, three marine strata and two terrestrial strata were recovered in the core, which were confidently correlated with seismic units in the profiles. The bottom marine strata (DU6) were mainly composed of intertidal and subtidal deposits and were formed in the Marine Isotope Stage (MIS) 5.1; the middle marine strata (DU4) mainly consisted of littoral and intertidal deposits and were formed in the MIS 3; the top marine strata (DU2 and DU1) were transgressive sands and tidal sands in the last deglaciation, respectively. The two terrestrial strata (DU5 and DU3) were incised valley filling deposits, and were formed in the MIS 4 and MIS 2, respectively. Transgressive medium - coarse sands (DU2) constructed the base of sand waves. The main body of sand waves (DU1), which had been formed since the high sea-level stage in Holocene, mainly consisted of medium - coarse sands and gravelly medium - coarse sands, with stable grain-size and good sorting on the top. Grain-size frequency distribution curves of sand waves have a modal number of -1 to 3 Φ; probability cumulative curves are two-segment pattern generally, with leap composition more than 80% and suspension composition less than 20%.Correlative analysis shows that there is a positive correlative between mean grain-size and sorting coefficient of tidal sand deposits (DU1), indicating that the stronger tidal current scouring the coarser grain-size and the better sorting is the sandy deposits.
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  • Received:  2013-08-20
  • Revised:  2014-04-04
  • Published:  2014-12-10

Late Pleistocene and Holocene Stratigraphy and Paleo- environmental Evolution in the Western Taiwan Shoal

Abstract: Sediment core and high-resolution subbottom profiles from the western Taiwan Shoal were analyzed to research stratigraphic sequence, paleo-environmental development of the Shoal. According to the analyses of sedimentary characteristics, grain-sizes and AMS 14C dating, three marine strata and two terrestrial strata were recovered in the core, which were confidently correlated with seismic units in the profiles. The bottom marine strata (DU6) were mainly composed of intertidal and subtidal deposits and were formed in the Marine Isotope Stage (MIS) 5.1; the middle marine strata (DU4) mainly consisted of littoral and intertidal deposits and were formed in the MIS 3; the top marine strata (DU2 and DU1) were transgressive sands and tidal sands in the last deglaciation, respectively. The two terrestrial strata (DU5 and DU3) were incised valley filling deposits, and were formed in the MIS 4 and MIS 2, respectively. Transgressive medium - coarse sands (DU2) constructed the base of sand waves. The main body of sand waves (DU1), which had been formed since the high sea-level stage in Holocene, mainly consisted of medium - coarse sands and gravelly medium - coarse sands, with stable grain-size and good sorting on the top. Grain-size frequency distribution curves of sand waves have a modal number of -1 to 3 Φ; probability cumulative curves are two-segment pattern generally, with leap composition more than 80% and suspension composition less than 20%.Correlative analysis shows that there is a positive correlative between mean grain-size and sorting coefficient of tidal sand deposits (DU1), indicating that the stronger tidal current scouring the coarser grain-size and the better sorting is the sandy deposits.

WANG Li-bo, LI Jun, CHEN Zheng-xing, ZHAO Jing-tao, BAI Feng-long, HU Bang-qi, DOU Yan-guang, ZHAI Bin. Late Pleistocene and Holocene Stratigraphy and Paleo- environmental Evolution in the Western Taiwan Shoal[J]. Acta Sedimentologica Sinica, 2014, 32(6): 1089-1099.
Citation: WANG Li-bo, LI Jun, CHEN Zheng-xing, ZHAO Jing-tao, BAI Feng-long, HU Bang-qi, DOU Yan-guang, ZHAI Bin. Late Pleistocene and Holocene Stratigraphy and Paleo- environmental Evolution in the Western Taiwan Shoal[J]. Acta Sedimentologica Sinica, 2014, 32(6): 1089-1099.
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