Universität zu Köln

Vogel, Hendrik ORCID: 0000-0002-9902-8120, Russell, James M., Cahyarini, Sri Yudawati, Bijaksana, Satria ORCID: 0000-0001-6374-4128, Wattrus, Nigel, Rethemeyer, Janet and Melles, Martin ORCID: 0000-0003-0977-9463 (2015). Depositional modes and lake-level variability at Lake Towuti, Indonesia, during the past similar to 29 kyr BP. J. Paleolimn., 54 (4). S. 359 - 378. DORDRECHT: SPRINGER. ISSN 1573-0417

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Abstract

Lake Towuti (2.5 S, 121.5 E) is a longlived, tectonic lake located on the Island of Sulawesi, Indonesia, and in the center of the Indo-Pacific warm pool (IPWP). Lake Towuti is connected with upstream lakes Matano and Mahalona through the Mahalona River, which constitutes the largest inlet to the lake. The Mahalona River Delta is prograding into Lake Towuti's deep northern basin thus exerting significant control on depositional processes in the basin. We combine high-resolution seismic reflection and sedimentological datasets from a 19.8-m-long sediment piston core from the distal edge of this delta to characterize fluctuations in deltaic sedimentation during the past * 29 kyr BP and their relation to climatic change. Our datasets reveal that, in the present, sedimentation is strongly influenced by deposition of laterally transported sediments sourced from the Mahalona River Delta. Variations in the amount of laterally transported sediments, as expressed by coarse fraction amounts in pelagic muds and turbidite recurrence rates and cumulative thicknesses, are primarily a function of lake-level induced delta slope instability and delta progradation into the basin. We infer lowest lake-levels between * 29 and 16, a gradual lake level rise between* 16 and 11, and high lake-levels between * 11 and 0 kyr BP. Periods of highest turbidite deposition,* 26 to 24 and* 18 to 16 kyr BP coincide with Heinrich events 2 and 1, respectively. Our lake-level reconstruction therefore supports previous observations based on geochemical hydroclimate proxies of a very dry last glacial and a wet Holocene in the region, and provides new evidence of millennial-scale variations in moisture balance in the IPWP.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Vogel, Hendrik UNSPECIFIED orcid.org/0000-0002-9902-8120 UNSPECIFIED Russell, James M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cahyarini, Sri Yudawati UNSPECIFIED UNSPECIFIED UNSPECIFIED Bijaksana, Satria UNSPECIFIED orcid.org/0000-0001-6374-4128 UNSPECIFIED Wattrus, Nigel UNSPECIFIED UNSPECIFIED UNSPECIFIED Rethemeyer, Janet UNSPECIFIED UNSPECIFIED UNSPECIFIED Melles, Martin UNSPECIFIED orcid.org/0000-0003-0977-9463 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-386194
DOI:	10.1007/s10933-015-9857-z
Journal or Publication Title:	J. Paleolimn.
Volume:	54
Number:	4
Page Range:	S. 359 - 378
Date:	2015
Publisher:	SPRINGER
Place of Publication:	DORDRECHT
ISSN:	1573-0417
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language EAST-AFRICA; MONSOON; CLIMATE; RECORD; FLUCTUATIONS; SULAWESI; CIRCULATION; VEGETATION; TANGANYIKA; TURBIDITE Multiple languages Environmental Sciences; Geosciences, Multidisciplinary; Limnology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/38619