Origin and Emplacement of the Oceanic Core Complex at IODP Site 735

IODP 735 站点海洋核心复合体的起源和位置

• 批准号: 0426126
• 负责人: Henry Dick
• 金额: $ 16.02万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-08-01 至 2007-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0426126&HistoricalAwards=false
• 关键词: Origin; Emplacement; Oceanic; Core; Complex

Under this award, the PIs will analyze videotapes, still camera images, and do petrography of dredge, rock drill, and dive samples from 5 site survey cruises to the Atlantis Bank Oceanic Core Complex on the SW Indian Ridge. They will complete the shore based analysis of the field programs and synthesize the data to publish a geologic map, and interpretive cross-sections documenting the stratigraphy, and emplacement the complex. The site is located adjacent to the Atlantis II F.Z. on 11 My old crust exposing a 400 km2 lower crustal gabbro massif in contact with the mantle along the transform wall. It is the location of 1.5 km deep ODP Hole 735B, the only deep hole in the lower ocean crust, and the location of a pending IODP proposal for a new hole to 3 km. The work will provide the geological context for the drilling and tests of ideas on the structure and lithology of ocean crust.

根据这一奖项，PI将分析录像带、静态相机图像，并从5次现场勘测邮轮到西南印度洋海脊的亚特兰蒂斯浅滩海洋核心综合体进行挖泥船、凿岩机和潜水样本的岩石学分析。他们将完成外业项目的岸基分析，并综合数据以发布地质图，以及记录地层的解释横断面，并部署综合体。该遗址位于亚特兰蒂斯二号自由贸易区附近，我的旧地壳暴露出一块400平方公里的下地壳辉长岩地块，沿着转换墙与地幔接触。这是1.5公里深的ODP735B孔的位置，这是下层洋壳中唯一的深洞，也是IODP正在等待的新孔提案的位置，新孔长达3公里。这项工作将为钻探和测试关于洋壳结构和岩性的想法提供地质背景。