The genetic relationship between ultramafic-hosted massive sulfides and their host rocks: petrological, geochemical and isotopic investigations of hydrothermal systems along the Mid-Atlantic Ridge between 14°45`N and 15°05`N

热液系统（沉淀物、喷口流体和喷口动物群）与沿14°45 ′ N和15°05 ′ N之间缓慢扩张的大西洋中脊的超镁铁质寄主岩石之间的成因关系是这一合作项目的重点。主要的科学问题是，在该地区也存在的超镁铁岩或玄武岩或辉长岩中是否发生了热液循环和沥滤。原生地幔物质的岩石学、部分熔融程度、原生和次生硫化物的矿物学和化学成分是理解源岩在向热液系统提供元素（“源岩控制”）方面的作用的关键。确定海底热液沉淀物的矿物学、地球化学和同位素组成上的源岩指纹（包括铂族元素和锇同位素）将有助于实现这一目标，并为合作研究小组的研究提供重要信息，这些研究小组的重点是流体化学、热液系统随时间的演变以及矿物表面的微生物过程。该项目的样品将在“Meteor”巡航期间收集。

The genetic relationship between hydrothermal systems (precipitates, vent fluids, and vent fauna) and their ultramafic host rocks along the slow-spreading mid-Atlantic ridge between 14°45´N and 15°05´N is the focus of this cooperative project. The main scientific question is whether hydrothermal circulation and leaching has taken place in ultramafic rocks or in basaltic or gabbroic lithologies that are also present in the area. The petrology of the primary mantle material, the degree of partial melting, and the mineralogical and chemical composition of both primary and secondary sulfides are keys to understand the role of the source rocks in providing elements to the hydrothermal system ("source rock control"). The determination of fingerprints of the source rock (including PGEs and Os-isotopes) on the mineralogical, geochemical, and isotopic composition of the hydrothermal precipitates at the seafloor will add to this goal and also provide vital information for the studies of cooperating research groups that focus on fluid chemistry, evolution of the hydrothermal systems over time, and microbial processes at mineral surfaces. The samples for this project will be collected during "Meteor"-cruises.