Stable organic carbon isotope stratigraphy across Oceanic Anoxic Event 2 of Demerara Rise, western tropical Atlantic
Stable organic carbon isotope stratigraphy across Oceanic Anoxic Event 2 of Demerara Rise, western tropical Atlantic
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DOI：
10.1029/2004gc000850
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发表时间：
2005-06-25
影响因子：
3.5
通讯作者：
Mutterlose, J
中科院分区：
文献类型：
--
作者：
Erbacher, J;Friedrich, O;Mutterlose, J
[1]大洋钻探计划(大洋钻探计划)第207段在德梅拉拉隆起(热带大西洋西部)发现了富含有机碳的层状页岩的扩大部分。高分辨率有机碳同位素和总有机碳(TOC)记录，跨越了包括大洋缺氧事件(OAE)2在内的新生代-都罗纪界线区间(CTBI)，从沿NW向走向的深度断面的4个地点获得。这些记录代表了热带大西洋南美边缘OAE 2的第一个高分辨率碳同位素记录。由于年代意义重大的化石的稀缺，这项研究的主要目的是开发详细的碳同位素地层学，以便将深度断面上的CTBI与西部内陆盆地(美国普韦布洛)、北部陆架海(英格兰伊斯特本)和西特提斯(奥伊德·墨尔勒盖，突尼斯)的生物地层学定义明确的剖面联系起来。所有四个部分都记录了在CTBI的基础上增量(13)C(Org)值增加了6%，然后是增量(13)C(Org)值升高的间隔，然后是随后的下降。我们的研究结果为后续的古海洋学研究提供了重要的地层学基础，研究对象为德梅拉拉隆起等地晚更新世至早都罗世沉积。组成部分：4631字，4位数字。
[ 1] Ocean Drilling Program (ODP) Leg 207 recovered expanded sections of organic-carbon-rich laminated shales on Demerara Rise ( western tropical Atlantic). High-resolution organic carbon isotope and total organic carbon ( TOC) records are presented, which span the Cenomanian-Turonian boundary interval ( CTBI), including the Oceanic Anoxic Event ( OAE) 2, from four sites oriented along a NW striking depth transect. These records represent the first high-resolution carbon isotope records across OAE 2 from the South American margin of the tropical Atlantic. Due to the scarcity of age significant fossils, the main purpose of this study was to develop a detailed carbon isotope stratigraphy in order to correlate the CTBI across the depth transect and to tie this to biostratigraphically well-defined sections in the Western Interior Basin ( Pueblo, USA), boreal shelf seas ( Eastbourne, England), and western Tethys ( Oued Mellegue, Tunisia). All four sections studied document a 6% increase of delta(13)C(org) values at the base of the CTBI, which is followed by an interval of elevated delta(13)C(org) values and a subsequent decrease. Our results supply an important stratigraphic base for subsequent paleoceanographic studies on Late Cenomanian to Early Turonian sediments from Demerara Rise and elsewhere. Components: 4631 words, 4 figures.