Mahesh, Badanal Siddaiah and Nair, Abhilash and Warrier, Anish Kumar and Avadhani, Anirudha and Mohan, Rahul and Tiwari, Manish (2018) Palaeolimnological records of regime shifts from marine-to-lacustrine system in a coastal Antarctic lake in response to post-glacial isostatic uplift. Current Science, 115 (9). pp. 1679-1683. ISSN 0011-3891
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Abstract
Low altitude coastal lakes along the Antarctic margin often contain both marine and lacustrine sediments as a result of relative sea level changes due to deglaciation. The sediments also record changes in regional climate. A sediment core from a coastal lake in Larsemann Hills, East Antarctica, viz. Stepped Lake (Heart Lake), records distinct changes in C, N, C/Natomic ratio, δ 13COM, δ 15NOM and diatom abundance during the mid-Holocene (8.3 to 4.6 kyr BP). Lower values (Corg ~1%; C/N 8, 13COM ~ –18‰) during the early Holocene (8.3–4 kyr BP) are consistent with marine conditions, while higher values [Corg 6%; C/N 12; 13COM ~ –12‰) suggest a shift to lacustrine conditions (5.5–4.6 kyr BP). The diatom community shows similar shift with the major part of Holocene (8.3– 5.5 kyr BP) dominated by sea-ice and open-ocean diatoms while the core-top sections (5.5–4.6 kyr BP) transitions to lacustrine diatoms (Stauroforma inermis). These observations confirm that the basin was marine, and later became isolated as a result of postglacial isostatic uplift after 4.7 kyr BP.
Item Type: | Article |
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Uncontrolled Keywords: | Diatoms, Holocene climate, Larsemann Hills, stable isotopes, sedimentary organic matter |
Subjects: | Engineering > MIT Manipal > Civil Engineering |
Depositing User: | MIT Library |
Date Deposited: | 10 Nov 2018 06:03 |
Last Modified: | 10 Nov 2018 06:03 |
URI: | http://eprints.manipal.edu/id/eprint/152233 |
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