Sulfur isotope studies of drill cores from the Barberton Greenstone Belt

巴伯顿绿岩带钻芯的硫同位素研究

• 批准号: 1251804
• 负责人: James Farquhar
• 金额: $ 1.63万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1251804&HistoricalAwards=false
• 关键词: Sulfur; isotope; studies; drill; cores

This proposal requests funds to support analysis of four sulfur isotopes in 70 bulk samples from three cores collected as part of recent ICDP drilling in the Barberton Mountain Land, South Africa. Samples include black shales, disseminated sulfide and sulfide layers in chert and barite. The proposed analyses will provide a first glimpse into the sulfur isotope geochemistry of these Palaeoarchean era (3600 to 3200 million years ago) sedimentary sequences with an excellent state of preservation. One goal of this work will be to evaluate the possibility that evidence exists supporting microbial reworking of sulfur, and if so, what information it provides for understanding sources of sulfur to and controls on sulfate concentrations in the oceans. A second aim of this work will be to evaluate whether variations in the relationship between Δ36S and Δ33S that are seen in other successions are present in the Paleoarchean. Project is part of a broad international collaboration on sulfur isotopes on these core materials involving the PI, and scientists at University of Utrecht, Westfälische Wilhelms University (Muenster, Germany), the Swedish Museum of Natural History (Stockholm, Sweden) and the Institute de Physique du Globe (Paris, France). All of these groups are currently either involved in existing collaborations or are planning to work together under the umbrella of the Barberton Drilling project. This is seen as a unique opportunity to study a large number of samples using shared techniques at a high level of detail from the approximately 2 km of sedimentary drill core, providing ample room for joint studies and coordination between sub-projects to yield a more significant and comprehensive dataset. At minimum, one joint overview publication in a major international journal will results from this work.

该提案请求资金支持对来自三个岩心的 70 个批量样品中的四种硫同位素进行分析，这些样品是最近在南非巴伯顿山区进行 ICDP 钻探的一部分。样品包括黑色页岩、浸染状硫化物以及燧石和重晶石中的硫化物层。拟议的分析将让人们首次了解这些保存状况良好的古太古代（3600至32亿年前）沉积序列的硫同位素地球化学。这项工作的一个目标是评估存在支持微生物对硫进行再加工的证据的可能性，如果是的话，它为了解海洋中硫的来源和硫酸盐浓度的控制提供了哪些信息。这项工作的第二个目标是评估古太古代中是否存在其他演替中所见的Δ36S 和Δ33S 之间关系的变化。该项目是这些核心材料硫同位素广泛国际合作的一部分，涉及 PI 以及乌得勒支大学、威斯特法伦威廉大学（德国明斯特）、瑞典自然历史博物馆（瑞典斯德哥尔摩）和地球物理研究所（法国巴黎）的科学家。所有这些团体目前要么参与现有合作，要么计划在巴伯顿钻探项目的框架下合作。这被视为一个独特的机会，可以使用共享技术对约 2 公里沉积钻芯的大量细节进行高细节研究，为子项目之间的联合研究和协调提供充足的空间，以产生更重要和更全面的数据集。这项工作至少将在主要国际期刊上发表一篇联合概述文章。