Coastal GIA processes revealed by the early to middle Holocene sealevel history of east China

QUATERNARY SCIENCE REVIEWS

卷:233

Article

Xiong, Haixian^1,2  Zong, Yongqiang²  Li, Tanghua³  Long, Tengwen⁴  Huang, Guangqing¹  Fu, Shuqing¹ 

[1] Guangzhou Inst Geog, Guangdong Open Lab Geospatial Informat Technol &, Guangzhou, Peoples R China

[2] Univ Hong Kong, Dept Earth Sci, Hong Kong, Peoples R China

[3] Nanyang Technol Univ, Earth Observ Singapore, Singapore, Singapore

[4] Univ Nottingham Ningbo, Sch Geog Sci, Ningbo, Peoples R China

关键词: Holocene;    Sea-level changes;    China;    Diatoms;    GIA;   

DOI  :  10.1016/j.quascirev.2020.106249

来源: Elsevier

【 摘 要 】

In order to examine relative sea-level responses to the postglacial ice-volume change and the glaciohydro isostatic adjustments (GIA), this study investigated the inner part of the Hangzhou Bay, east China, a tectonically relatively stable far-field location, and reconstructed the early to middle Holocene sea-level history. This investigation has established the elevational relationship between modern saltmarsh-mudflat and tidal levels based on diatom analysis for sea-level indicative meaning estimates, produced 17 high-quality sea-level index points, and simulated GIA processes for the study site. These results reveal that the relative sea level rose from similar to 38.3 +/- 1.6 m in c. 10,000 cal a BP to the present height by c. 7000 cal. a BP, and the average rate of sea-level rise decreased gradually from 19.6 +/- 2.6 mm/a to 2.3 +/- 1.5 mm/a during the 3000 years. This period of sea-level history was punctuated by two episodes of accelerated rise around 8200 and 7500 cal a BP. The relative sea level rose to 0.8 +/- 1.4 m above msl by c. 6500 cal. a BP, followed by a gradual fall back to the present height at 4500 cal a BP, implying a different response to the potential additional ice melting between 7000 and 4000 cal a BP. A comparison of the sea-level histories between the inner and outer Hangzhou Bay indicates the coastal levering effect due to the marine inundation of the continental shelves. A further comparison between sea-level data from China and Malay Peninsula reveals different GIA effects between the Cathaysia-Yangtze Blocks and the Sundaland Block. (C) 2020 Elsevier Ltd. All rights reserved.

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