Samarium-neodymium isotopic characteristics of the clay-size fraction in surface sediments from the western Arctic Ocean and their implications for sediment sources and transport pattern

CHEN Zhi-hua; LI Chao-xin; MENG Xian-wei; SHI Xue-fa; CHENG Zhenbo

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CHEN Zhi-hua, LI Chao-xin, MENG Xian-wei, SHI Xue-fa, CHENG Zhenbo. Samarium-neodymium isotopic characteristics of the clay-size fraction in surface sediments from the western Arctic Ocean and their implications for sediment sources and transport pattern[J]. Haiyang Xuebao, 2011, 33(2): 96-102.

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Samarium-neodymium isotopic characteristics of the clay-size fraction in surface sediments from the western Arctic Ocean and their implications for sediment sources and transport pattern

First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Key Laboratory of State Oceanic Administration for Marine Sedimentology & Environmental Geology, First Institute of Oceanogranhy, State Oceanic Administration Qingdao 266061, China

Received Date: 2010-06-20

Abstract

Abstract

Sm-Nd isotopes were measured on the clay-size fraction of thirty-four surface sediments to clarify sediment provenance and transport mechanism in the western Arctic Ocean, the Chukchi Sea, the Chukchi Borderland and the Canadian Basin. Spatial variations of Sm and Nd isotopes of surface sediments indicate there are multiple provenances in the study area. In the Chukchi Sea, three isotope-inferred sediment provenances,which have gradually decreasing c(¹⁴⁷Sm) to c(¹⁴⁴Nd), epsilon values of Nd and model ages from west to east, indicate the northward transport paths of the three branches of the Pacific inflows. Due to the transport of the clockwise Beaufort Gyre, sediments are mainly derived from the Mackenzie River and have lower epsilon value Nd of (-13.28 -11.76) and older model age in the Canadian Basin and on the Chukchi Plateau in the north of the study area. Meanwhile, relatively larger model age deviations indicate there are strong water mass and sediment mixing due to co-actions of the Pacific water, the Atlantic water and the Beaufort Gyre on the Chuckchi Rise and continental slope.
- western Arctic Ocean,
- Samarium-neodymium isotopes,
- sediment provenance and transport mechanism,

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