STRATIGRAPHIC SEQUENCE AND DEPOSITIONAL ENVIRONMENT SINCE MARINE ISOTOPE STAGE 6 IN THE CONTINENTAL SHELF OF THE WESTERN SOUTH YELLOW SEA: A CASE OF SYS-0804 CORE
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摘要: 利用南黄海西部陆架区SYS-0804(孔深65.10 m,水深38 m)钻孔岩心和高分辨率的浅地层剖面资料,开展浅地层剖面解译、岩心沉积物的岩性特征和有孔虫组合综合分析以及AMS14C测年,并结合国内外最新研究成果开展对比研究,深入探讨南黄海西部陆架残留沉积区氧同位素6(MIS 6)期以来的地层、沉积环境演化以及与海平面变化的关系。研究结果表明,SYS-0804钻孔可划分为DU 1和DU 4~DU 8共6个沉积单元,对应于MIS 6、MIS 5、MIS 4、MIS 3和MIS 1早期的沉积地层,缺失DU 2和DU 3(包括MIS 2期以及MIS 3和MIS 1晚期的沉积)。MIS 6期(128~189 cal.kaBP)研究区为河流沉积(河漫滩)环境。MIS 5早期(115~128 cal.kaBP),研究区为近岸浅海沉积环境,发育海洋冷水团沉积。MIS 5中-晚期-MIS 4(60~115 cal.kaBP)研究区沉积环境从早期的滨海沉积向近岸浅海沉积以及河流沉积过渡。MIS 3早-中期(40~60 cal.kaBP),早期为滨海-浅海沉积,中期发育潮道充填沉积。MIS 2末期-MIS 1中期(11.5~13.0至0.7 cal.kaBP),研究区在11.5~13.0 cal.kaBP形成冰后期海侵界面,随后随着海平面的进一步上升,为滨海-浅海环境,发育冰后期海侵沉积序列。Abstract: A 65.10-m-long core (SYS-0804) recovered at water depth of 38 m from the relict sediment area off the South Yellow Sea (SYS), together with high resolution shallow seismic profiles, is analyzed on sedimentary characteristics and foraminiferal assemblages. Dated by AMS 14C and upon the basis of latest research results both at home and abroad, the stratigraphic and environmental evolution and sea level changes during the MIS 6 period are documented in this paper. Results show that the core SYS-0804 can be divided into 6 depositional units, i.e. the DU 1 and the DU4 to DU 8, deposited in the periods of MIS 6, MIS 5, MIS 4, MIS 3 and the early epoch of MIS 1 respectively. The DU 2 and DU 3 formed in MIS 2 and MIS 3 are absent, and the deposits formed in the later period of MIS 1 are also missing. During the period of MIS 6 (128~128 cal.kaBP), fluvial environment (mainly flood plain) dominated the research area. In the early stage of MIS 5 (115~128 cal.kaBP), a nearshore shallow sea environment characterized by cold water mass deposition was prevailing. The depositional units from middle MIS 5 to MIS 4 (60~115 cal.kaBP) are interpreted as the sediments deposited in littoral to inner sublittoral and fluvial environments. The sediments deposited in early to middle MIS 3(40~60 cal.kaBP), show a succession from coastal and shallow sea environments in the early stage, to tidal channels in the later stage. From the later period of MIS 2 to middle MIS 1 (11.5~13.0~0.7 cal.kaBP), it changed into a coast-shallow environment with a transgressional boundary at 11.5~13.0 cal.kaBP. covered by a transgressional sequence formed in the period of sea level rising.
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Keywords:
- South Yellow Sea /
- depositional environment /
- provenance
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