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Paleoceanographic changes during the past one million years in the Central Basin, northwestern Ross Sea

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Title
Paleoceanographic changes during the past one million years in the Central Basin, northwestern Ross Sea
Other Titles
북서부 로스해 중앙분지의 과거 1백만년 동안의 고해양학적 변화
Authors
Lee, Min Kyung
Yoo, Kyu-Cheul
Lee, Jae Il
Ohneiser, Christian
Kim, Sunghan
McKay, Robert
Albot, Olya
Riesselman, Christina
Bollen, Michael
Levy, Richard
Yoon, Ho Il
Keywords
PaleoceanAntarcticaRoss Seamarine sediment
Issue Date
2019
Citation
Lee, Min Kyung, et al. 2019. Paleoceanographic changes during the past one million years in the Central Basin, northwestern Ross Sea. XII International Symposium on Antarctic Earth Sciences. Incheon Songdo Convensia. 2019.07.22~2019.07.26.
Abstract
The Central Basin is located in the northwestern Ross Sea continental slope and rise. A 11.75 m-long core RS15-LC42 was collected from the southwestern part of the Central Basin (71° 49 S, 178°35.E, 2084 m deep) by the Korean RVIB Araon in 2015. The chronology is established based on paleomagnetism and diatom biostratigraphy. This core covers about 1.3 million years. Ohneize et al. (2019) reported Brunhes-Matuyama reversal (0.78 Ma) at 8.26 mbsf of this core, and according to paleo-intensity records the sedimentation is almost continuous although there is a hiatus near 9.54 mbsf. LC42 core is composed of two distinct sedimentary facies: 1) well-laminated greenish gray diatom-rich silty mud, and 2) massive/bioturbated light gray sandy mud. Well-laminated fac include high content of TOC, opal and carbonate with no IRD (clasts > 2 mm), while massive/bioturbated sandy mud facies show hi MS value and bear clasts IRDs. The laminated silty mud facies has abundance in illite while smectite and kaolinite is relatively rich i sandy mud facies. The chlorite content does not change as a whole. The difference in clay mineral composition between two facies indicates that two facies originated from different sources. The diatom assemblage in LC42 include reworking indicator species (early-Pliocene and Miocene taxa), and the tendency of reworking is evident in the lower part of the boundary between 2.8 and 3.2 mbsf. This result suggest that there was a significant shift in the oceanographic regime in this region around 0.3 Ma.
URI
https://repository.kopri.re.kr/handle/201206/12418
Conference Name
XII International Symposium on Antarctic Earth Sciences
Conference Place
Incheon Songdo Convensia
Conference Date
2019.07.22~2019.07.26
Type
Proceeding
Indexed
Pro(초록)국외
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)
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