VARIATION IN GRAIN-SIZE DISTRIBUTION PATTERN OF THE SOUTHEASTERN LIAODONG BAY AND ITS IMPACT FACTORS
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摘要: 通过对辽东湾湾口海域两根柱样沉积物(LDC30和LDC25孔)的岩性和粒度参数特征分析,并结合前人研究结果,对该海域早全新世以来的沉积环境和物源演变过程进行了探讨。结果表明,两孔的岩性和粒度特征均可划分为上下两层,上层沉积物的砂含量和平均粒径均明显大于下部。两孔下层沉积物为该海域全新世海侵开始至约高海平面(~7 kaBP),海平面逐渐升高过程中的滨岸浅海沉积,而上层沉积物为全新世最大海平面以来的潮流沉积产物。同时,LDC30和LDC25孔的物质来源在上下两层不一,主要受控于海平面变化导致的沉积环境演变和气候变化控制的河流沉积物输入。Abstract: Based on the lithology and grain-size parameters of the two piston cores(LDC30 and LDC25),we studied the changes in sedimentary environment and provenance of the southeastern Liaodong Bay since early Holocene.The lithology and grain-size parameters of the two cores display two step variations,and the sand content and mean grain-size of the upper layers are obviously larger than that in the lower parts.It suggests that the lower section of the sediments is mainly deposited under a nearshore shallow marine environment during the early Holocene transgression,whereas the upper section deposited in the tidal environment since the highest sea level stand (~7 kaBP).The sediment provenance of these two sections in the piston cores is also different with each other,under the control of sedimentary environment changes caused by sea level fluctuation and the terrigenous input variation related to the East Asian summer monsoon.
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Key words:
- grain-size /
- tidal deposits /
- sea-level change /
- Liaodong Bay
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