Early and late Holocene paleoenvironmental reconstruction of the Pearl River estuary, South China Sea using foraminiferal assemblages and stable carbon isotopes
RESOLUTION POLLEN RECORD
; BULK ORGANIC DELTA-C-13
; HUGUANGYAN MAAR LAKE
; EAST-ASIAN MONSOON
; SAN-FRANCISCO BAY
; CONTINENTAL-SHELF
; ENVIRONMENTAL INDICATORS
; WATER DISCHARGE
; NORTHERN COAST
; YANGTZE DELTA
WOS学科分类:
Marine & Freshwater Biology
; Oceanography
WOS研究方向:
Marine & Freshwater Biology
; Oceanography
英文摘要:
Proxy reconstructions of estuarine evolution provide perspectives on regional to global environmental changes, including relative sea-level changes, climatic changes, and agricultural developments. Here, we present a new benthic foraminiferal record along with delta C-13 and C/N, and lithological data from a sediment core in the Pearl River estuary (Lingding Bay) adjacent to the South China Sea. The core has relatively thick Holocene sediments (> 40 m) due to its location in the paleo-valley of the Pearl River. The lithologic and foraminiferal record reveal an evolution in paleoenvironment from fluvial, inner estuary to middle estuary between 11300 and 8100 cal a BP in response to rapid sea-level rise. delta C-13 and C/N data indicate high freshwater discharge from 10500 to 8100 cal a BP driven by a strong Asian monsoon. The middle Holocene (8100 - 3300 cal a BP) sediment is absent in the core due to subaqueous erosion resulting from the unique geomorphology of the Pearl River Delta. In the late Holocene from 3300 cal a BP to the present, the lithology and foraminiferal assemblages suggest a further evolution from outer estuary, middle estuary channel, to middle estuary shoal, resulting from deltaic pro gradation under stable relative sea levels. In the last 2000 years, delta C-13 and C/N values reveal the intensive development of agriculture coupled with the reduction of freshwater input derived from a weakening Asian monsoon.
1.Sun Yat Sen Univ, Sch Earth Sci & Engn, Guangzhou, Guangdong, Peoples R China 2.Southern Lab Ocean Sci & Engn, Zhuhai 519000, Guangdong, Peoples R China 3.Nanyang Technol Univ, Asian Sch Environm, Singapore, Singapore 4.Guangdong Prov Transportat Planning & Res Ctr, Guangzhou 510101, Guangdong, Peoples R China 5.Sun Yat Sen Univ, Sch Marine Sci, Guangzhou, Guangdong, Peoples R China 6.Guangdong Sea Star Ocean Sci & Techol Co Ltd, Guangzhou, Guangdong, Peoples R China 7.Nanyang Technol Univ, Earth Observ Singapore, Singapore, Singapore
Recommended Citation:
Chen, Huixian,Wang, Jianhua,Khan, Nicole S.,et al. Early and late Holocene paleoenvironmental reconstruction of the Pearl River estuary, South China Sea using foraminiferal assemblages and stable carbon isotopes[J]. ESTUARINE COASTAL AND SHELF SCIENCE,2019-01-01,222:112-125