Clay-sized sediment provenance change in the northern Okinawa Trough since 22 kyr BP and its paleoenvironmental implication

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doi: 10.1016/j.palaeo.2014.01.016
Author(s): Xu Zhaokai; Li Tiegang; Chang Fengming; Wan Shiming; Choi, Jinyong; Lim, Dhongil
Author Affiliation(s): Primary:
Chinese Academy of Sciences, Institute of Oceanology, Key Laboratory of Marine Geology and Environment, Qingdao, China
Kunsan National University, South Korea
Korea Ocean Research and Development Institute, South Korea
Volume Title: Palaeogeography, Palaeoclimatology, Palaeoecology
Source: Palaeogeography, Palaeoclimatology, Palaeoecology, Vol.399, p.236-245. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 CODEN: PPPYAB
Note: In English. 68 refs.; illus., incl. 2 tables, sketch maps
Summary: Provenances of clay-sized terrigenous sediments and a comprehensive interpretation of their high-resolution variations in the northern Okinawa Trough since the late last glaciation remain unclear, especially in regard to the Huanghe- and Taiwan-derived matter. Grain size, clay mineralogy, typical elemental ratio, oxygen isotope, and AMS 14C dating of core PC-1 in the northern Okinawa Trough were investigated to trace clay-sized sediment provenance and transport process and thus to recover their forcing mechanisms over the last 22 kyr. Variations in linear sedimentation rate, grain size, δ18O, Ti/Ca ratio, and clay minerals can be clearly divided into three distinct intervals, consistent with changes in sediment provenance that can be close related to sea-level fluctuation, evolution of the Tsushima Warm Current as well as influence from the East Asian monsoon climate evolution. During the late last glaciation period (Interval 1, 22-16 kyr BP) when the Tsushima Warm Current was absent in the East China Sea, the paleo-Huanghe mouth was situated close to the study area and thus the paleo-Huanghe could have played major role in sedimentation therein. In Interval 2 (16-7.3 kyr BP), global sea-level rise led to gradually retreating of the paleo-Huanghe mouth and thus decreasing terrigenous sediment supply from it to the study area. Since 7.3 kyr BP (Interval 3), some clay minerals from Taiwan might have been transported northward to the study area by the fully evolved Tsushima Warm Current, characterized by higher chlorite/kaolinite ratios. In contrast, the decreasing influence of the Huanghe-derived sediments during the strengthening of the Tsushima Warm Current periods was probably caused by the blocking effect of the Tsushima Warm Current. Particularly, chlorite/kaolinite ratio and smectite content in the Okinawa Trough sediment might be good proxies for indicating the Tsushima Warm Current-related sedimentary environment. Abstract Copyright (2014) Elsevier, B.V.
Year of Publication: 2014
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Absolute age; Alkaline earth metals; Asia; C-14; Calcium; Carbon; Cenozoic; China; Clastic sediments; Clay; Clay mineralogy; Clay minerals; Cores; Currents; Dates; East Asian monsoon; Far East; Grain size; Huang He; Isotope ratios; Isotopes; Leg 195; Metals; North Pacific; Northwest Pacific; O-18/O-16; ODP Site 1202; Ocean Drilling Program; Ocean currents; Okinawa Trough; Oxygen; Pacific Ocean; Paleo-oceanography; Paleoclimatology; Paleoenvironment; Provenance; Quaternary; Radioactive isotopes; Sea-level changes; Sedimentation; Sedimentation rates; Sediments; Sheet silicates; Silicates; Stable isotopes; Titanium; Tsushima Warm Current; West Pacific
Coordinates: N244800 N244900 E1223100 E1223000
Record ID: 2014046614
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands