Quantitative relationship between surface sedimentary diatoms and water depth in North-Central Bohai Bay, China

IF 4.6 3区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

China Geology Pub Date : 2023-01-01 DOI:10.31035/cg2022040

Zhi-wen Shang , Jian-fen Li , Holger Freund , Pei-xin Shi , Hong Wang

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Abstract

To study the quantitative relationship between surface sedimentary diatoms and water depth, 67 surface samples were collected for diatom analysis on eight profiles with water depth variation from the muddy intertidal zone to the shallow sea area in North-Central Bohai Bay, China. The results showed that the distribution of diatoms changed significantly in response to the change in water depth. Furthermore, the quantitative relationship between the distribution of dominant diatom species, their assemblages, and the water depth was established. The water depth optima for seven dominant species such as Cyclotella striata/stylorum, Paralia sulcata, and Coscinodiscus perforatus and the water depth indication range of seven diatom assemblages were obtained in the study area above the water depth (elevation) of −10 m. The quantitative relationship between surface sedimentary diatoms and water depth provides a proxy index for diatom-paleo-water depth reconstruction in the strata in Bohai Bay, China.

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渤海湾中北部表层沉积硅藻与水深的定量关系

为了研究表层沉积硅藻与水深的定量关系，从渤海湾中北部泥质潮间带到浅海区，采集了67个表层硅藻样品，对8个水深变化剖面进行了硅藻分析。结果表明，硅藻的分布随水深的变化而发生显著变化。此外，还建立了优势硅藻的分布、组合和水深之间的定量关系。在−10m水深（高程）以上的研究区内，获得了条纹环星藻/柄柱藻、沟伞藻和穿孔藻等7种优势种的最佳水深和7种硅藻组合的水深指示范围。表层沉积硅藻与水深的定量关系为渤海湾地层硅藻古水深重建提供了一个可替代的指标。©2023中国地质编辑部。

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来源期刊

China Geology GEOLOGY-

CiteScore

7.80

自引率

11.10%

发文量

275

审稿时长

16 weeks