Magnetic fingerprints of surface sediment in the Bohai Sea, China

Magnetic properties of the surface sediments in the Yellow River Estuary and Laizhou Bay, Bohai Sea, China: Implications for monitoring heavy metals

“…4) (Zhang et al, 2011). The magnetic minerals in the LB and YRE are similar to those in the Chinese Loess Plateau (CLP) in north-central China (Li et al, 2020, Yang et al, 2000Zhang et al, 1990b), because the materials carried by YR are mostly from the CLP to the LB (Heller and Liu, 1984;Liu et al, 2015;Liu et al, 1992;Ren and Shi, 1986;van Velzen and Dekkers, 1999;Zhang et al, 1990a). In addition, several local streams along the southern LB coast also supply the coastal area of the LB, albeit to a small degree (Compiling Committee of Records of China Bays, 1991;Li et al, 2020;Wang et al, 2010).…”

“…Previous studies indicated that Zone IV is supplied by sediments from both the YR and the adjacent rivers (e.g., Jiehe River) in the east coast (Fig. 1) according to the comparisons of magnetic parameters (Li et al, 2020). The Jiehe River flows through the Zhaoyuan County with a long history of gold mining, hence its water and sediments contain higher Cu, Pb, Zn, Ni, Cr, and Cd contents than other rivers along the LB (Xu et al, 2013).…”

“…Particle sizes of the extracted magnetic minerals of the adjacent rivers and the bay are several tens of μm (Fig. 4) (Li et al, 2020). There are angular, subangular, and spherical particles in morphology.…”

Persistent Influence of Non‐Dipole Geomagnetic Field on East Asia Over the Past 4,000 Years

“…The radiocarbon dates for cores M12–8, M5‐8, and BHB15‐6 have been used to develop individual chronology by linear regression for these cores (Table S1 in Supporting Information S1). Magnetic analysis of Surface sediment from the Bohai Sea and surrounding rivers reveals that the Yellow River is the primary source of magnetic materials throughout the Bohai Sea (M. Li et al., 2020), while sediments from other rivers are deposited primarily in nearshore areas (Chen et al., 1982). These findings suggest that magnetic parameters, such as $$\chi $$, can be used to refine the age model.…”

“…The Bohai Sea is a semi‐closed inland sea that covers an area of ∼78,000 km 2 and is connected to the Yellow Sea through the Bohai Strait (Figure 1b). The Sea is characterized by a maximum and average water depth of 84 and 18 m, respectively (M. Li et al., 2020). More than 30 rivers flow into the Bohai Sea, contributing a discharge of ∼7.8 × 10 8 tons of sediment annually, with the terrigenous input mainly from the Yellow, Haihe, Luanhe, and Liaohe Rivers.…”