Microgastropod records in paleoceanographical environment of southern shelf of South China Sea since 14 ka |
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| Authors: | Weimin Feng |
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| Institution: | Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China |
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| Abstract: | Very diversified and abundant benthic microgastropods and planktonic microgastropods (pteropods) from core NS93-12-25 could
provide a glance of change of the sea level in the south continental shelf of the South China Sea since last 14 ka. Research
shows that general sea level changes of this sea area were rising and later rising after a short period of falling in this
period. In the range from the bottom of the core to the core depth of 200 cm, individuals in big size are common in microgastropods
and Turritella filiola is very rich, signifying the environment of the inner continental shelf in the last deglaciation stage. In the core depth
range of 200–150 cm the continuously getting light of the δ18O, the regularly decreasing of the percentage content of T. filiola and the high diversification of microgastropods indicate the rising of the sea level. Especially at the core depth range
of 175–150 cm the pteropods became dominant, making sure the fact that the high sea level possibly occurred in the early Holocene.
Channels of surrounding straits connecting the adjacent sea thus were opened. But at the core depth of about 100 cm T. filiola became very rich again. This possibly implies that there was a short term of the sea level falling, resulting in the temporal
closure of the channels. In the core depth range of 55–50 cm the Scaliola’s representatives relatively develop and this may be inferred to the cooling of climate. |
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| Keywords: | southern shelf of South China Sea microgastropod paleoceanographical environment |
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