Determining sources of deep-sea mud by organic matter signatures in the Sunda trench and Aceh basin off Sumatra
Determining sources of deep-sea mud by organic matter signatures in the Sunda trench and Aceh basin off Sumatra
复制标题
通过苏门答腊岛巽他海沟和亚齐盆地的有机质特征确定深海泥浆的来源
DOI：
10.1007/s00367-017-0510-x
复制
发表时间：
2017
影响因子：
2.1
通讯作者：
Arai Kazuno and Udrekh
中科院分区：
文献类型：
--
作者：
Akiko Omura;Ken Ikehara;Arai Kazuno and Udrekh
对细粒沉积物岩心中有机碳的含量、光学测定性质和稳定同位素组成进行了分析，以研究晚更新世至全新世亚齐弧前盆地和苏门答腊岛巽他海沟底部沉积的深海沉积物的起源。在亚齐盆地，冰消期期间，随着海平面上升，浊积泥的沉积频率降低。末次冰期末期陆源有机碳含量较高，而在冰消期，大部分有机碳来自海洋。在巽他海沟中，全新世浊积岩由来自两个不同来源的再活动斜坡沉积物组成：来自古老孟加拉/尼科巴扇的沉积物包含热成熟的有机碎片，而来自海沟斜坡的沉积物几乎不含陆源有机碳。
The content, optically determined properties, and stable isotope composition of organic carbon in fine-grained sediment cores were analyzed to investigate the origins of deep-sea sediments deposited in the Aceh forearc basin and on the Sunda trench floor off Sumatra from the late Pleistocene to the Holocene. In the Aceh basin, the depositional frequency of turbidite mud decreased as sea level rose during the deglaciation. The terrigenous organic carbon content was high at the end of the last glacial period, whereas during the deglaciation most of the organic carbon was of marine origin. In the Sunda trench, the Holocene turbidites consisted of remobilized slope sediments from two different sources: sediments derived from the old Bengal/Nicobar fan included thermally matured organic fragments, whereas those derived from the trench slope contained little terrigenous organic carbon.