Journal
SEDIMENTARY GEOLOGY
Volume 331, Issue -, Pages 132-147Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.sedgeo.2015.10.014
Keywords
Yangtze River delta; Sequence stratigraphy; Sedimentary facies; Holocene; Last Glacial Maximum
Categories
Funding
- Marine Public Welfare Research Project [200805063]
- National Natural Science Foundation of China [41406051, 41076023]
- Basic Scientific Fund for National Public Research Institutes of China [GY2014G08, GY2015P11]
- Coastal Investigation and Research Project of China [908-02-02-05]
- International Cooperation Project [GASI-GEOGE-03]
- Taishan Scholar Program of Shandong [200805063]
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This study focuses on sedimentary research at the subaqueous Changjiang (Yangtze River) delta, based on five high-resolution seismic profiles and seven borehole cores with accurate AMS C-14 datings. Three distinct seismic units were identified from the seismic profiles according to seismic reflection characteristics, and five sedimentary facies were recognized from borehole cores. These fades constituted a fining upward sedimentary sequence in relation to postglacial sea-level transgression. Three sequence surfaces (sequence boundary (SB), transgressive surface (TS), and maximum flooding surface (MFS)) demarcate the boundaries between early transgressive system tract (E-TST), late transgressive system tract (L-TST), early highstand system tract (E-HST) and late highstand system tract (L-HST), which constitute the sixth order sequence. These system tracts were developed coevally with postglacial sea-level rise, E-TST (similar to 19-12 ka BP) corresponds to an incised-valley infilling in the early stages of postglacial transgression whereas L-TST (similar to 12-7.5 ka BP) was formed during the last stage of post glacial transgression. The progradational structure of L-TST reflected in seismic profiles is possibly related to the intensification of the East Asian summer monsoon. E-HST (similar to 7.5-2 ka BP) was deposited in response to the highstand after maximum postglacial transgression was reached, while L-HST (similar to 2 ka BP-present) was initiated by accelerated progradation of the Changjiang delta. (C) 2015 Elsevier B.V. All rights reserved.
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