KOPRI Repository

Elemental Compositions of Smectites Reveal Detailed Sediment Provenance Changes during Glacial and Interglacial Periods: The Southern Drake Passage and Bellingshausen Sea, Antarctica

Cited 2 time in wos
Cited 2 time in scopus
Metadata Downloads
Title
Elemental Compositions of Smectites Reveal Detailed Sediment Provenance Changes during Glacial and Interglacial Periods: The Southern Drake Passage and Bellingshausen Sea, Antarctica
Other Titles
스멕타이트의 원소 조성을 이용한 남극 드레이크해협-벨링스하우젠해의 빙하주기에 따른 퇴적물 기원지 변화
Authors
Park, Young Kyu
Lee, Jae Il
Jung, Jaewoo
Hillenbrand, Claus-Dieter
Yoo, Kyu-Cheul
Kim, Jinwook
Subject
Mineralogy; Mining & Mineral Processing
Keywords
West Antarctica; Drake Passage; Bellingshausen Sea; clay mineralogy; elemental composition of smectite; transmission electron microscopy
Issue Date
2019-05
Citation
Park, Young Kyu, et al. 2019-05. "Elemental Compositions of Smectites Reveal Detailed Sediment Provenance Changes during Glacial and Interglacial Periods: The Southern Drake Passage and Bellingshausen Sea, Antarctica". MINERALS, 9(5): 322-322.
Abstract
Variations in clay mineral assemblages have been widely used to understand changes in sediment provenance during glacial and interglacial periods. Smectite clay minerals, however, have a range of various elemental compositions that possibly originated from multiple different sources. Therefore, it might be crucial to distinguish the various types of smectites by analyzing their elemental composition in order to verify the sediment provenances with certainty. This hypothesis was tested for the clay mineral characteristics in a marine sediment core from the southern Drake Passage (GC05-DP02). Rare earth elements and epsilon Nd data had previously indicated that fine grained detritus was supplied from the Weddell Sea to the core site during interglacial periods, when the sediments contained more Al-rich smectite (montmorillonite). Indeed, marine sediments collected close to the Larsen Ice Shelf on the eastern Antarctic Peninsula continental shelf, western Weddell Sea embayment, show more Al-rich smectite components as compared with other possible West Antarctic sources, such as the Ross Sea embayment or King George Island, South Shetland Islands. Furthermore, two types of smectite (Al-rich and Al-poor) were identified in core GC360 from the Bellingshausen Sea shelf, suggesting that during glacial periods some sediment is derived from subglacial erosion of underlying pre-Oligocene sedimentary strata containing predominantly Al-rich montmorillonite. This finding reveals different sources for smectites in sediments deposited at site GC360 during the last glacial period and during the present interglacial that show only minor differences in smectite contents. For the interglacial period, two groups of smectite with a wide range of Al-rich and Mg-Fe-rich were identified, which indicate delivery from two different sources: (1) the detritus with high contents of Mg-Fe-rich smectite supplied from Beethoven Peninsula, southwestern Alexander island and (2) the detritus with higher contents of Al-rich smectite (montmorillonite) possibly derived from the subglacial reworking of pre-Oligocene sedimentary strata. These results demonstrate that the elemental compositions of smectites can be used to differentiate the sources of smectites in marine sediments, which is an important tool to define sediment provenance in detail, when down-core changes observed in clay mineral assemblages are interpreted.
URI
https://repository.kopri.re.kr/handle/201206/10836
DOI
http://dx.doi.org/10.3390/min9050322
Appears in Collections  
2019-2019, Reconstruction of Antarctic ice sheet and ocean history for the past two million years using sediment records (19-19) / Lee, Jae Il (PE19030)
Files in This Item

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse