DOI: 10.1007/s00531-014-1043-4
论文题名: Clay mineralogy of the ocean sediments from the Wilkes Land margin, east Antarctica: implications on the paleoclimate, provenance and sediment dispersal pattern
作者: Verma K. ; Bhattacharya S. ; Biswas P. ; Shrivastava P.K. ; Pandey M. ; Pant N.C. ; IODP Expedition 318 Scientific Party
刊名: International Journal of Earth Sciences
出版年: 2014
卷: 103, 期: 8 起始页码: 2315
结束页码: 2326
语种: 英语
英文关键词: Clay minerals
; Ice sheet
; Ocean sediments
; Plio-pleistocene
英文摘要: Core U1359 collected from the continental rise off Wilkes Land, east Antarctica, is analyzed for the clay mineralogy and carbon content. The temporal variation of the clay mineralogical data shows a dominance of illite with chlorite, smectite and kaolinite in decreasing concentration. Clay mineral illite is negatively correlated with smectite which shows enrichment during 6.2–6.8, 5.5–5.8, 4.5 and 2.5 Ma. The mineralogical analyses on the silt size fraction (2–53 μm) of some selected samples were also carried out. The combined result of both the size fractions shows the presence of chlorite and illite in both size fractions, smectite and kaolinite only in clay size fraction (<2 μm) and similarity in the crystallinity and chemistry of illite in both fractions. Similar nature of illite in both fractions suggests negligible role of sorting probably due to the deposition from the waxing ice sheet. During times of ice growth, nearby cratonic east Antarctica shield provided biotite-rich sediments to the depositional site. On the other hand, the presence of smectite, only in the clay size fraction, suggests the effective role of sorting probably due to the deposition from distal source in ice retreat condition. During times of ice retreat, smectite-rich sediment derived from Ross Orogen is transported to the core site through surface or bottom water currents. Poor crystallinity of illite due to degradation further corroborates the ice retreat condition. The ice sheet proximal sediments of U1359 show that in the eastern part of Wilkes Land, the ‘warming’ was initiated during late Miocene. © 2014, Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84939896383&doi=10.1007%2fs00531-014-1043-4&partnerID=40&md5=84ae4ad7554578989e96b58ad940f334
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70464
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Geological Survey of India, NH-5P, NIT, Faridabad, Haryana, India; Department of Geology, Center of Advanced Study, University of Delhi, Delhi, India
Recommended Citation:
Verma K.,Bhattacharya S.,Biswas P.,et al. Clay mineralogy of the ocean sediments from the Wilkes Land margin, east Antarctica: implications on the paleoclimate, provenance and sediment dispersal pattern[J]. International Journal of Earth Sciences,2014-01-01,103(8)