Mineralogical and geochemical investigations of sediment-source region changes in the Okinawa Trough during the past 100ka (IMAGES core MD012404)

Major sinks of the Changjiang (Yangtze River)-derived sediments in the East China Sea during the late Quaternary

“…Mineralogical and geochemical evidence of the core sediments confirm the accumulation of Changjiang-derived clay in the middle Okinawa Trough during the last deglacial period (Dou et al 2010a(Dou et al , b, 2012Chen et al 2011). …”

“…Sedimentological and geochemical studies of several cores (e.g. DGKS 9603, 9604, MD012404, ODP Site 1202) suggest that during the last glaciation (c. 30-10 ka) the sediment that accumulated in the middle Okinawa Trough was predominantly sourced from the palaeo-Changjiang (Diekmann et al 2008;Dou et al 2010aDou et al , b, 2012Chen et al 2011), or partly from eastern Taiwan (Chen et al 2011). All of these studies imply that even during the LGM with a severe monsoon climate, the palaeo-Changjiang river mouth might have extended to the present-day outer shelf, supplying terrigenous sediment both to the shelf itself and even the Okinawa Trough.…”

“…P. Liu et al 2006J. P. Liu et al , 2007Xu et al , 2012Dou et al 2010aDou et al , b, 2012Chen et al 2011;Horng & Huh 2011;Gao & Collins 2014;Li et al 2014;Yang et al 2014). The sheet sand that blankets the ECS shelf has been considered to be made of relict deposits (Niino & Emery 1961;Emery 1968), primarily formed at the last glacial maximum (LGM) or deglacial period with a sea-level lowstand (Yang & Sun 1988;Yang 1989;Liu 1997;Berné et al 2002;Z.…”

Sr–Nd isotopic constraints on detrital sediment provenance and paleoenvironmental change in the northern Okinawa Trough during the late Quaternary

“…Until now, contribution of detritus into the southern and middle parts of the trough during the late Quaternary has been investigated extensively based mainly on paleontological, biogeochemical, mineralogical, elemental, magnetic, and isotopic properties of core sediments (e.g., Chen et al, 1979Chen et al, , 2011Diekmann et al, 2008;Dou et al, 2010aDou et al, , b, 2012Jian et al, 2000;Liu et al, 2007a;Ujiié et al, 2001;Xu et al, 2012aXu et al, ,b, 2014aZheng et al, 2011). Among these indices, Sr-Nd isotopic compositions of detrital fractions have been proven useful tracers on sediment provenance (Dou et al, 2012;Hu et al, 2012;Xu et al, 2014b;Yang et al, 2007a,b).…”

Sr–Nd isotopic constraints on terrigenous sediment provenances and Kuroshio Current variability in the Okinawa Trough during the late Quaternary

“…A lot of proxies including micropaleontological, clay mineralogical, element geochemical and magnetic methods have been widely applied to identify the origins of Quaternary sediments in the Okinawa Trough (Chen et al, 1982;Jian et al, 1998Jian et al, , 2000Liu et al, 2007;Diekmann et al, 2008;Dou et al, 2010a,b;Chen et al, 2011). The radiogenic SrNd isotope system is more informative on sediment provenance than clay minerals and element geochemical data because they generally record more petrographic signature of parent rocks (Ehlert et al, 2011).…”