Changes in the source and transport mechanism of terrigenous input to the Indian sector of Southern Ocean during the late Quaternary and its palaeoceanographic implications

Journal of Earth system science

P C Pandey1¹  Witty D'Souza1¹  R Mohan1¹  M Thamban1¹  N Basavaiah2²  Sarita Kerkar1¹  A Rajakumar1¹  M M Subramaniam1¹  M Sudhakar1¹  S S Naik1¹ 

[1] National Centre for Antarctic and Ocean Research, Headland Sada, Goa 403 804, India.$$;Indian Institute of Geomagnetism, Kalamboli, New Panvel (W), Navi Mumbai 410 218, India.$$

关键词: Magnetic susceptibility;    terrigenous flux;    late Quaternary;    Southern Ocean.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

Changes in the terrigenous sediment source and transport mechanisms during the late Quaternary have been investigated using four sediment cores within the Indian sector of Southern Ocean, using the magnetic susceptibility (MS)and sedimentological records.Sediments deposited during the Holocene and other interglacial periods were characterised by low MS,low sand content, reduced ice-rafted detritus (IRD)input and increased illite possibly transported via hydrographic advection from the south.The glacial intervals are characterised by high MS,high sand content, increased IRD input and reduced illite clays,derived from both local as well as Antarctic sources. Significant reduction in clay fraction and illite content during glacials suggests that the erosive and transporting capabilities of the deep and bottom waters could have reduced compared to the interglacial times.The changes in terrigenous in flux to this region were signi ficantly in fluenced by the rhythmic glacial –interglacial fluctuations in bottom circulation and the position of the Polar Front.

【 授权许可】

Unknown