Holocene coral reef development in Chenhang Island, Northern South China Sea, and its record of sea level changes

2021 ◽  
pp. 106593
Author(s):  
Yifang Ma ◽  
Yeman Qin ◽  
Kefu Yu ◽  
Yinqiang Li ◽  
Yating Long ◽  
...  
Keyword(s):  
Coral Reef ◽  
South China Sea ◽  
Sea Level ◽  
South China ◽  
Northern South China Sea ◽  
Sea Level Changes ◽  
Reef Development ◽  
China Sea

Records of sea-level highstand over the Meghalayan age/late Holocene from uranium-series ages of beachrock in Weizhou Island, northern South China Sea

The Holocene ◽  
2021 ◽  
pp. 095968362110332
Author(s):  
Tingli Yan ◽  
Kefu Yu ◽  
Rui Wang ◽  
Wenhui Liu ◽  
Leilei Jiang
Keyword(s):  
South China Sea ◽  
Sea Level ◽  
South China ◽  
Intertidal Zone ◽  
Meteoric Water ◽  
Northern South China Sea ◽  
Water Environment ◽  
Sea Levels ◽  
China Sea ◽  
Micro Structures

Beachrock is considered a good archive for past sea-levels because of its unique formation position (intertidal zone). To evaluate sea-level history in the northern South China Sea, three well-preserved beachrock outcrops (Beigang, Gongshanbei, and Hengling) at Weizhou Island, northern South China Sea were selected to examine their relative elevation, sedimentological, mineralogical, and geochemical characteristics. Acropora branches with well-preserved surface micro-structures were selected from the beachrocks and used to determine the ages of these beachrocks via U-series dating. The results show that the beachrocks are composed of coral reef sediments, terrigenous clastics, volcanic clastics, and various calcite cements. These sediments accumulated in the intertidal zone of Weizhou Island were then cemented in a meteoric water environment. The U-series ages of beachrocks from Beigang, Gongshanbei, and Hengling are 1712–768 ca. BP, 1766–1070 ca. BP, and 1493–604 ca. BP (before 1950 AD) respectively. Their elevations are 0.91–1.16 m, 0.95–1.24 m, and 0.82–1.17 m higher than the modern homologous sedimentary zones, respectively. Therefore, we concluded that the sea-level in the Meghalayan age (1766–604 ca. BP) was 0.82–1.24 m higher than the present, and that the sea-level over this period showed a declining trend.

Coralline algal assemblages record Miocene sea-level changes in the South China Sea

2021 ◽  
Vol 584 ◽  
pp. 110673
Author(s):  
Yinqiang Li ◽  
Kefu Yu ◽  
Lizeng Bian ◽  
Yeman Qin ◽  
Weihua Liao ◽  
...  
Keyword(s):  
South China Sea ◽  
Sea Level ◽  
South China ◽  
The South China Sea ◽  
Sea Level Changes ◽  
The South ◽  
China Sea ◽  
Algal Assemblages

scholarly journals Population subdivision promoted by a sea-level-change-driven bottleneck: a glimpse from the evolutionary history of the mangrove tree Aegiceras corniculatum

2021 ◽  
Author(s):  
Rufan Zhang ◽  
Zixiao Guo ◽  
Lu Fang ◽  
Cairong Zhong ◽  
Norman Duke ◽  
...  
Keyword(s):  
South China Sea ◽  
Sea Level ◽  
South China ◽  
Northern South China Sea ◽  
Population Subdivision ◽  
Computation Method ◽  
Southern South China Sea ◽  
Aegiceras Corniculatum ◽  
Coastal Plants ◽  
China Sea

Historic climate changes had always driven geographical populations of coastal plants to contract and recover dynamically, even die out completely. Species suffering from such bottlenecks usually lose intraspecific genetic diversity, but how do these events influence population subdivision patterns of coastal plants? We investigated this question in the typical coastal plant: mangrove species Aegiceras corniculatum. Inhabiting the intertidal zone of the tropical and subtropical coast of the Indo-West Pacific oceans, its populations are deemed to be greatly shaped by historic sea-level fluctuations. Using dual methods of Sanger and Illumina Solexa sequencing, we found that the 18 sampled populations were structured into two groups, namely, the “Indo-Malayan” group, comprising three subgroups (the northern South China Sea, Gulf of Bengal, and Bali), and the “Pan-Australasia” group, comprising the subgroups of the southern South China Sea and Australasia. Based on simulations using the approximate Bayesian computation method, we inferred that the southern South China Sea subgroup, which penetrates the interior of the “Indo-Malayan” group, originated from the Australasia subgroup, accompanied by a severe bottleneck event, with a spot of gene flow from both the Australasia and “Indo-Malayan” groups. Geographical barriers such as the Sundaland underlie the genetic break between Indian and Pacific Oceans, but the discontinuity between southern and northern South China Sea was originated from genetic drift in the bottleneck event. Hence, we revealed a case evidencing that the bottleneck event promoted population subdivision. This conclusion may be applicable in other taxa beyond coastal plants.

Reef-carbonate diagenesis in the Pleistocene–Holocene of the well Xike#1, Xisha Islands, South China Sea: implications on sea-level changes

2019 ◽  
Vol 34 (4) ◽  
pp. 1669-1687 ◽  
Author(s):  
Na Liu ◽  
Zhen-feng Wang ◽  
Xu-shen Li ◽  
Li Liu ◽  
Dao-jun Zhang ◽  
...  
Keyword(s):  
South China Sea ◽  
Sea Level ◽  
South China ◽  
Carbonate Diagenesis ◽  
Sea Level Changes ◽  
Xisha Islands ◽  
China Sea

scholarly journals Radiocarbon Profiles of Rocky Islet, Xi-Sha Islands: Evidence of Recent Crustal Movements in the South China Sea

Radiocarbon ◽  
1983 ◽  
Vol 25 (2) ◽  
pp. 375-379 ◽  
Author(s):  
Chen Yee-Chein ◽  
Jiao Wen-Qiang
Keyword(s):  
South China Sea ◽  
Coral Reefs ◽  
Sea Level ◽  
South China ◽  
Granite Gneiss ◽  
The South China Sea ◽  
Sea Level Changes ◽  
The South ◽  
Crustal Movements ◽  
China Sea

The Xi-Sha Islands comprise 35 coral reefs, cays, and islets lying to the northwest of the South China Sea. Since Miocene time, > 1200m of bioherms developed on slowly subsiding granite-gneiss bed rock. These sediments provide evidence for sea-level changes and crustal movements in the South China Sea.

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