Changes in diffuse reflectance spectroscopy properties of hematite in sediments from the North Pacific Ocean and implications for eolian dust evolution history

Zhang, Qiang1,2; Liu, QingSong3,4

2018-07

10.26464/epp2018031

Earth and Planetary Physics   影响因子和分区

2096-3955

Eolian dust preserved in deep-sea sediments of the North Pacific Ocean (NPO) is an important recorder of paleoclimatic and paleoenvironmental changes in the Asian inland. To better understand changes in the dust provenances, in this study diffuse reflectance spectroscopy (DRS) was used to extract the eolian signal recorded in sediments of ODP Hole 885A recovered from the NPO. First, we systematically investigated sieving effects on the DRS data; then band positions of hematite (obtained from the second order derivative curves of the K-M remission function spectrum derived from the DRS) were used to distinguish different provenances of the eolian dust preserved in the pelagic sediments of this hole. Our results show that the sieving (38 mu m) process can suppress effectively the experimental errors. Eolian signatures from Chinese Loess Plateau (CLP) sources and non-CLP-sources have been identified in the pelagic sediments of ODP Hole 885A from the late Pliocene to the early Pleistocene. The provenance differences account for the discrepancies in the eolian records recovered from the pelagic sediments in the NPO and profiles in the CLP. Temporal changes in dust provenances are caused by the latitudinal movement of the westerly jet mainstream. The hematite DRS band position is a useful tool to distinguish the provenance of eolian components preserved in pelagic sediments.

eolian dust diffuse reflectance spectroscopy hematite

ESCI

英语

通讯

National Key R&D Program of China[2016YFA0601903] ; NSFC-Shandong Joint Fund for Marine Science Research Centers[U1606401] ; National Program on Global Change and Air-Sea Interaction[GASI-GEOGE-03] ; National Natural Sciences Foundation of China[41430962]

Geology

Geosciences, Multidisciplinary

WOS:000448277700007

SCIENCE PRESS

Web of Science

1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China;
2.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China;
3.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen 518055, Peoples R China;
4.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China

Zhang, Qiang,Liu, QingSong. Changes in diffuse reflectance spectroscopy properties of hematite in sediments from the North Pacific Ocean and implications for eolian dust evolution history[J]. Earth and Planetary Physics,2018,2(4):342-350.

Zhang, Qiang,&Liu, QingSong.(2018).Changes in diffuse reflectance spectroscopy properties of hematite in sediments from the North Pacific Ocean and implications for eolian dust evolution history.Earth and Planetary Physics,2(4),342-350.

Zhang, Qiang,et al."Changes in diffuse reflectance spectroscopy properties of hematite in sediments from the North Pacific Ocean and implications for eolian dust evolution history".Earth and Planetary Physics 2.4(2018):342-350.