Indian Ocean Carbonate Platform Evolution: Currents, Monsoon, and Sea Level (IndoCarb)

印度洋碳酸盐台地演化：洋流、季风和海平面 (IndoCarb)

• 批准号: 279495435
• 负责人: Professor Dr. Christian Betzler
• 金额: --
• 依托单位: Leitstelle Deutsche Forschungsschiffe
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/279495435?language=en
• 关键词: Indian; Ocean; Carbonate; Platform; Evolution

The overarching objective of this proposal is to unlock the Neogene paleoceanographic, sea-level and paleoenvironmental archive of the Maldives. The hypothesis to test is that paleoceanographical changes are a major controlling factor of carbonate platform facies and stratigraphy. Therefore the Maldives carbonate platform will be developed as a reference case of a dual control on platform development by sea-level and paleoceanographical changes. This goal will be achieved by analyzing cores, sediment samples, and wireline logs acquired during IODP Expedition 359, and linking these data to the seismic stratigraphy. The stratigraphic evolution of the Maldives carbonate platform is punctuated by several key intervals which reflect changes in the platform architecture. The different events are (A) the drowning of the Oligocene platform and later development of a restricted environment in the Early Miocene ("Drowning 1), (B) the platform edge reconfiguration from bank margins to platform with hanging shoulders in the Middle Miocene (Hanging shoulders) and (C) the turnover from platform to drift deposition in the Middle Miocene (Drowing 2). The link of these events and global sea level is equivocal and indicates that sea-level fluctuations were not the only drivers of this pattern. Drowning 1 interrupted the Oligocene platform growth, but allowed a later recovery of the platform in a more marginal position during the Miocene. The controlling factor of this drowning episode is yet unclear but may be related to sea-level fluctuations and elevated organic content. Drowning 2 has been related to the occurrence of strong currents due to the onset of the Indian Ocean Monsoon. The demise of large parts of the banks was stepwise and permanent. The other major event, the change from a platform with bank margins to a platform with hanging shoulders in the Middle Miocene is linked to the onset of the Miocene Climate Optimum. A major reconfiguration in the basin occurred coeval to this change in platform edge and slope geometry which is recorded in the sediment with drastic changes in the ichnofabrics and the microfacies. The integrated study of ichnofabrics, microfacies, XRF data, wireline logs and seismic profiles will allow discriminating environmental conditions and relating them to the processes affecting the carbonate platform. Our objective is also to prove that there are different types of drowning affecting carbonate platforms; Some of them interrupt the development of the platform in a reversible way that allow a regeneration of the sedimentary environment, and some of them are completely irreversible and permanently change the sedimentary environment. The working hypothesis is that not only the nutrient input, but also the strength of the currents contribute to these platform reconfigurations. These are results which go far behind the understanding of the regional sedimentology and which have impact for carbonate sedimentological models in general.

该提案的总体目的是解锁马尔代夫的新金元古环境，海平面和古环境档案。测试的假设是，古环数变化是碳酸盐平台相和地层学的主要控制因素。因此，马尔代夫碳酸盐平台将作为参考案例，是对平台开发的双重控制，通过海平面和古环数变化。该目标将通过分析IODP Expedition 359期间获得的核心，沉积物样品和有线日志来实现，并将这些数据与地震地层链接起来。马尔代夫碳酸盐平台的地层演化被几个关键间隔打断，反映了平台体系结构的变化。不同的事件是（a）渐新世平台的淹没，并在中新世早期（“溺水1）中开发受限制的环境，（b）平台边缘从银行边缘到平台到平台到平台，悬挂在中新世（悬挂式肩部）和（c）在中间层次上悬挂的肩部的悬挂式悬挂到悬挂的层次范围内，并在整体中置于中间层次的链接（c），在中间的层次范围内，这些层次又有2个链接（繁忙的2）。表明海平面的波动不是这种模式的唯一驱动因素。1中断了渐新世平台的生长，但在中新世期间，该平台以更边缘的位置恢复了平台。季风。大部分银行的灭亡是逐步的，是另一个主要事件，从银行利润率到中新世中悬挂的平台的平台与中新世最新的肩膀发作有关。盆地中发生的主要重新配置发生在平台边缘和斜率几何形状中的这种变化中，该变化记录在沉积物中，并随着造成剂量繁殖和小额形象的急剧变化。综合研究的综合研究，微型法规，XRF数据，有线记录和地震概况将允许区分环境条件，并将其与影响碳酸盐平台的过程有关。我们的目标也是证明影响碳酸盐平台的溺水类型不同。他们中的一些人以可逆的方式中断了平台的开发，以使沉积环境再生，其中一些是完全不可逆的，并且会永久改变沉积环境。工作假设不仅是营养素的输入，而且电流的强度也有助于这些平台重新配置。这些结果远远落后于对区域沉积学的理解，并且对碳酸盐沉积模型产生了影响。

项目成果

Carbonate delta drift: A new sediment drift type

碳酸盐岩三角洲漂移：一种新的沉积物漂移类型

• DOI: 10.1016/j.margeo.2018.04.011
• 发表时间: 2018
• 期刊: Marine Geology
• 影响因子: 2.9
• 作者: Lüdmann;Betzler;Eberli;Reolid;Reijmer;Bialik;Alvarez-Zarkikian;Alonso-Garcia;Blatter;Haffen;Horozal;Jovane
• 通讯作者: Jovane

Ichnofabric logs for the characterization of the organic content in carbonates

用于表征碳酸盐中有机含量的 Ichnofabric 测井

• DOI: 10.1016/j.marpetgeo.2018.04.019
• 发表时间: 2018
• 期刊: Marine and Petroleum Geology
• 影响因子: 4.2
• 作者: Reolid;Betzler
• 通讯作者: Betzler