Depositional modes and lake-level variability at Lake Towuti, Indonesia, during the past ~29 kyr BP
Depositional modes and lake-level variability at Lake Towuti, Indonesia, during the past ~29 kyr BP
复制标题
过去约 29 kyr BP 期间印度尼西亚托乌提湖的沉积模式和湖水位变化
DOI：
--
复制
发表时间：
2015
影响因子：
2.1
通讯作者：
M. Melles
中科院分区：
文献类型：
--
作者：
H. Vogel;J. Russell;S. Y. Cahyarini;S. Bijaksana;N. Wattrus;J. Rethemeyer;M. Melles
图乌提湖（2.5°S, 121.5°E）是一个长期存在的构造湖，位于印度尼西亚苏拉威西岛，位于印度太平洋暖池（IPWP）的中心。图乌蒂湖通过马哈洛纳河与上游的马塔诺湖和马哈洛纳湖相连，马哈洛纳河构成了该湖最大的入口。马哈洛纳河三角洲向图乌提湖北部盆地深处推进，对盆地的沉积过程具有重要控制作用。结合高分辨率地震反射和沉积学数据集，研究了该三角洲远缘19.8 m长的沉积柱塞岩心在过去~ 29kyr BP的三角洲沉积波动及其与气候变化的关系。我们的数据集显示，在目前，沉积受到来自马哈洛纳河三角洲的横向输送沉积物沉积的强烈影响。横向搬运沉积物量的变化，以远洋淤泥的粗颗粒量和浊积岩的复发率和累积厚度表示，主要是湖泊水位引起的三角洲斜坡不稳定和三角洲向盆地推进的函数。我们推断湖的最低水位在~29 ~16年之间，湖的水位在~16 ~11年之间逐渐上升，湖的高水位在~11 ~ 0 kyr BP之间。浊积岩最高沉积期（~26 ~ 24和~18 ~ 16 kyr BP）分别与Heinrich事件2和Heinrich事件1相吻合。因此，我们的湖平面重建支持了基于该地区非常干燥的末次冰期和湿润的全新世的地球化学水文气候代用物的观测结果，并为IPWP的水分平衡在千年尺度上的变化提供了新的证据。
Lake Towuti (2.5°S, 121.5°E) is a long-lived, 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.
登录
查看更多内容
影响因子：
1.2
作者：
J. Russell;S. Bijaksana;H. Vogel;M. Melles;J. Kallmeyer;D. Arizteguí;S. Crowe;S. J. Fajar;A. Hafidz;D. Haffner;Ascelina K. M. Hasberg;S. Ivory;C. Kelly;J. King;Kartika Hajar Kirana;Marina A. Morlock;A. Noren;Ryan O’Grady;Luis Ordóñez;J. Stevenson;T. Rintelen;A. Vuillemin;I. Watkinson;N. Wattrus;S. Wicaksono;T. Wonik;K. Bauer;A. Deino;A. Friese;C. Henny;Imran;R. Marwoto;L. Ngkoimani;S. Nomosatryo;L. O. Safiuddin;R. Simister;G. Tamuntuan
通讯作者：
J. Russell;S. Bijaksana;H. Vogel;M. Melles;J. Kallmeyer;D. Arizteguí;S. Crowe;S. J. Fajar;A. Hafidz;D. Haffner;Ascelina K. M. Hasberg;S. Ivory;C. Kelly;J. King;Kartika Hajar Kirana;Marina A. Morlock;A. Noren;Ryan O’Grady;Luis Ordóñez;J. Stevenson;T. Rintelen;A. Vuillemin;I. Watkinson;N. Wattrus;S. Wicaksono;T. Wonik;K. Bauer;A. Deino;A. Friese;C. Henny;Imran;R. Marwoto;L. Ngkoimani;S. Nomosatryo;L. O. Safiuddin;R. Simister;G. Tamuntuan
影响因子：
64.8
作者：
Boehm, E.;Lippold, J.;Deininger, M.
通讯作者：
Deininger, M.
影响因子：
18.3
作者：
Dubois, Nathalie;Oppo, Delia W.;Linsley, Braddock K.
通讯作者：
Linsley, Braddock K.
影响因子：
64.8
作者：
Mohtadi, Mahyar;Prange, Matthias;Lueckge, Andreas
通讯作者：
Lueckge, Andreas