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

根据该合同，PIs将分析录像带，静止相机图像，并对疏浚，岩石钻探和潜水样本进行岩石学研究，这些样本来自位于西南印度洋山脊的亚特兰蒂斯银行海洋核心综合设施的5次现场调查巡航。他们将完成对现场项目的岸上分析，并综合数据，发布地质图，以及记录地层的解释性横截面，并安置复杂的地层。该基地位于亚特兰蒂斯II区附近，位于11my旧地壳上，暴露出一个400平方公里的下地壳辉长岩地块，沿转换壁与地幔接触。它位于1.5公里深的ODP 735B孔，是下海洋地壳中唯一的深孔，也是IODP提议的3公里新孔的位置。这项工作将为钻探和测试海洋地壳结构和岩性的想法提供地质背景。

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.