Magnetic susceptibility of the Xifeng section and its paleoclimate significance

Abstract

Magnetic susceptibility (MS) is one of the most important indicators of the East-Asia summer monsoon. Presented in this study is a high resolution magnetic susceptibility record from the Xifeng section, which consists of Quaternary loess-paleosol sequence and Pliocene red clay. Variations in magnetic susceptibility are well correlated with the δ 18 O record in deep-sea sediments and the eolian flux of Greenland. The climatic evolution in the Xifeng section shows that since the Late Tertiary, the driving force of the East-Asia paleo-monsoon is correlated with solar radiation on a 10-ka time scale .

New chronology of the best developed loess/paleosol sequence of Hungary capturing the past 1.1 ma: Implications for correlation and proposed pan-Eurasian stratigraphic schemes

“…If we accept that the MBB is between the two paleosols (U2-S7 and U2S8) then the displacement could indicate the socalled lock-in depth effect noted in other Chinese and Danubian loess profiles as well (Zhou and Shackleton, 1999;Markovi c et al, 2011Markovi c et al, , 2015Murray et al, 2014). A similar depth and position for the MBB was noted for the Xifeng loess section above loess unit 8 (L8) at a depth of 71 m. Later a higher position of MBB above the S8 pedocomplex and the bottom of S7 was proposed at a depth of 69 m for this profile (Liu et al, 1987(Liu et al, , 1988Guo et al, 2011Guo et al, , 2009ab;Sun et al, 2009;Wu and Wu, 2011). The displacement of the MBB from the top of L8 towards the bottom of S7 have been noted by Zhou and Shackleton (1999) blaming the so-called lock-in effect for the original position of the boundary.…”

“…So, using the characteristic MS pattern as a stratigraphic tool along with the newly established chronology, litho-and pedostratigraphy, our records were correlated with the regional records of similar age in Hungary (Paks) (P ecsi, 1995;Frechen et al, 1997;Sartori, 2000;Thiel et al, 2014;Újv ari et al, 2014a), Serbia (Stari Slankamen, Batajnica, Mo sorin, Ruma) (Markovi c et al, 2006(Markovi c et al, , 2009(Markovi c et al, , 2011(Markovi c et al, , 2015, Bulgaria (Koriten, Viatovo) (Jordanova and Petersen, 1999;Jordanova et al, 2007Jordanova et al, , 2008 Romania (Mostistea, Mircea Voda, Zimnicea) (Panaiotu et al, 2001;Buggle et al, 2009Buggle et al, , 2013R adan, 2012). In addition, cross-correlation was attempted with other long-known and studied Chinese LPS of Xifeng (Liu et al, 1987(Liu et al, , 1988Lu et al, 2004;Guo et al, 2009a;b;Sun et al, 2009;Wu and Wu, 2011;Zhang et al, 2015) using a synthesis stratigraphical column based on the U2-A borehole sequence.…”

“…It was based on an assumed presence of a uniform stratigraphic marker horizon of MIS 13e15 linking Chinese and European stratigraphies. The proposal of this horizon is rooted in the assumption, that if MIS 13e15 deposits represented by the S5 soil in Chinene LPSs are well-developed (Porter, 2001(Porter, , 2007Nutgeren et al, 2004;Hao and Guo, 2005;Yin andGuo, 2006, 2008;Guo et al, 2009a;b;Sun et al, 2009;Hao et al, 2012;Yin and Berger, 2012), then there must be an interglacial in Europe as well, whose deposits' characteristics are comparable with those of the S5 soil in China (Bronger and Heinkele, 1989;Bronger et al, 1998;Vandenberghe, 2000;Bronger, 2003). This assumption was further reinforced by the general presence of a well-developed, clay-rich paleosol considered to represent S5 in DBLPSs.…”

“…It is the cornerstone of future correlation with other regional and extraregional records, as well as the assessment of temporal variation of mass accumulation rates and paleoclimatic cycles. Availability of new marine (Lisiecki and Raymo, 2005) and terrestrial proxy reference records (Liu et al, 1987(Liu et al, , 1988Lu et al, 2004;Guo et al, 2009a;b;Sun et al, 2009;Wu and Wu, 2011;Zhou et al, 2014) as well as geomagnetic intensity timescales (Michalk et al, 2013;Singer et al, 2014) called for a revision as well.…”

Chemical weathering and provenance evolution of Holocene–Recent sediments from the Western Indus Shelf, Northern Arabian Sea inferred from physical and mineralogical properties

“…It is therefore possible to use magnetic susceptibility as a proxy for terrigenous sediment supply (De Menocal et al, 1991). It is widely used in a variety of marine and terrestrial settings as an indicator of changing environmental conditions and thus climate in the Asian monsoon region (e.g., De Menocal et al, 1991;Kumar et al, 2005;Thamban et al, 2005;Yancheva et al, 2007;Sun et al, 2009). It has been shown that increasing values of magnetic susceptibility correlate with periods of strengthening monsoon, as reconstructed from oxygen isotope records, revealing a link between Eolian transport and strong East Asian Winter Monsoon winds (An et al, 2001).…”