Geochemical composition (XRF SR uncorrected) of the Late Holocene sediments core LV66-3 (Amur Bay of the Sea of Japan)@en

Sediment core LV66-3 (43°07,473' N,131°49,622' E length of 466 cm; water depth 33 m) was collected in 2014 during the 66th cruise of the R/V Akademik M.A. Lavrentiev in the Amur Bay of the Sea of Japan using a gravity core. The sampling location was chosen in the zone of maximum bottom water hypoxia (Tishchenko et al., 2011), which ensured minimal bioturbation of sediments due to oppression of benthic fauna. Continuous seismic profiling data at this site revealed a homogeneous structure of the sedimentary strata, with no visible breaks in sedimentation and no inclusions of sediments of a different composition (Karnaukh et al., 2016). The sediments of core LV66-3 are represented by monotonous clays and silty clays of black or dark gray color without visible stratification, with slightly varying density and humidity (Akulichev et al., 2015; Karnaukh et al., 2016). The analysis of the prepared samples was performed in the Budker Institute of Nuclear Physics (Novosibirsk) using a scanning X-ray fluorescence analyzer with the synchrotron radiation (XRF SR ) at the VEPP-3 storage ring as the excitation source according to previously developed methods (Darin et al., 2005; 2015; Kalugin et al., 2007; 2015). The scanning step was 0.5-0.8 mm. The concentrations of Ca, K, Ti, Mn, Fe, V, Cr, Ni, Cu, Zn, Mo, Pb, Rb, Ba, Sr, Y, Br, As, and Nb were determined. The detection limits for the elements were (mg/g): 0.5 (Br, Rb, Sr, Nb), 1 (Zr, Y), 2 (Zn, Ni, Mn, Pb), 10 (Fe), 15 (Ti), and 100 (Ca, K) (Kalugin et al., 2015). Rubidium-normalized elements were used for dimensionless variation. The age model of core LV66-3 was based on radiocarbon dates, tephrochronological data, and chemostratigraphy. Calibration of the 14C dates to obtain the calendar age of the studied samples was performed with the Calib program (Stuiver and Reimer, 1993) using the Marine13 calibration curve (Reimer et al., 2013). Correction of the reservoir effect was made using the dating of shells from Novik Bay in the eastern part of the Amur Bay (Kuzmin et al., 2001). […]

沉积物岩芯LV66-3（北纬43°07.473′，东经131°49.622′，岩芯总长466 cm，采样水深33 m）于2014年由“M.A.拉夫连季耶夫院士号”（R/V Akademik M.A. Lavrentiev）第66航次在日本海阿穆尔湾采用重力取样器采集获得。采样点位选取于底层水体最大缺氧区（Tishchenko等，2011），该区域因底栖动物群落受到抑制，沉积物生物扰动程度极低。该点位的连续地震剖面数据显示，沉积地层结构均一，未见沉积间断以及异质沉积物混入现象（Karnaukh等，2016）。LV66-3岩芯沉积物以黑色至深灰色的均一黏土与粉砂质黏土为主，未见明显层理，密度与湿度仅存在小幅波动（Akulichev等，2015；Karnaukh等，2016）。样品分析工作于新西伯利亚的布德克尔核物理研究所完成，采用以VEPP-3储存环同步辐射（XRF SR）为激发源的扫描X射线荧光分析仪，并依据已建立的方法体系开展测试（Darin等，2005；2015；Kalugin等，2007；2015）。扫描步长设置为0.5~0.8 mm。本次分析测定了钙（Ca）、钾（K）、钛（Ti）、锰（Mn）、铁（Fe）、钒（V）、铬（Cr）、镍（Ni）、铜（Cu）、锌（Zn）、钼（Mo）、铅（Pb）、铷（Rb）、钡（Ba）、锶（Sr）、钇（Y）、溴（Br）、砷（As）以及铌（Nb）共19种元素的含量。各元素的检出限（单位：mg/g）分别为：溴（Br）、铷（Rb）、锶（Sr）、铌（Nb）为0.5；锆（Zr）、钇（Y）为1；锌（Zn）、镍（Ni）、锰（Mn）、铅（Pb）为2；铁（Fe）为10；钛（Ti）为15；钙（Ca）、钾（K）为100（Kalugin等，2015）。采用铷（Rb）归一化法对元素含量进行无量纲化处理。LV66-3岩芯的年代框架基于放射性碳测年、火山灰年代学数据以及化学地层学建立。为获取研究样品的日历年龄，采用Calib程序（Stuiver与Reimer，1993）结合Marine13校准曲线（Reimer等，2013）对14C测年数据进行校准。通过对阿穆尔湾东部诺维克湾的贝类样品测年结果，对储库效应进行校正（Kuzmin等，2001）[…]