Hydrothermal Systems in the Eastern Manus Basin: Fluid Chemistry and Magnetic Structure as Guides to Subseafloor Processes

马努斯盆地东部的热液系统：流体化学和磁结构作为海底过程的指导

• 批准号: 0327448
• 负责人: Maurice Tivey
• 金额: --
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-01 至 2008-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0327448&HistoricalAwards=false
• 关键词: Hydrothermal; Systems; Eastern; Manus; Basin

The PIs propose to conduct a high-resolution near-bottom bathymetric and magnetic survey and sampling program of the PACMANUS hydrothermal area and to collect and analyze fluid and solid samples and geophysical data from PACMANUS and Desmos hydrothermal systems in the eastern Manus Basin (EMB). Their goal is to integrate Leg 193 drill core data with comprehensive chemical, mineral, isotopic, and geophysical data to identify and constrain the key variables that influence crustal alteration, fluid chemistry, deposit composition and morphology, and the range of habitats available for biological communities in felsic-rock hosted systems. The idea is to study the entire system, including alteration assemblages at depth. Specific goals are to 1) delineate the tectonic and structural controls on hydrothermal activity within felsic crust of the EMB; 2) examine interaction of hydrothermal fluids with rocks of felsic composition (dacite to rhyodacite), which represent an endmember in the spectrum of basement compositions; 3) constrain geochemical processes responsible for ore formation; and 4) assess the role of magmatic fluids in EMB hydrothermal systems.

研究所提议对PACMANUS热液区进行高分辨率近底测深和磁力调查及取样方案，并收集和分析来自马努斯盆地东部PACMANUS和Desmos热液系统的流体和固体样品及地球物理数据。 他们的目标是将第193航次岩心数据与综合化学、矿物、同位素和地球物理数据相结合，以确定和限制影响地壳蚀变、流体化学、存款成分和形态以及长英岩系统中生物群落可利用的栖息地范围的关键变量。这个想法是研究整个系统，包括深度的蚀变组合。具体目标是：1）描绘对EMB长英质地壳内热液活动的构造和结构控制; 2）研究热液流体与长英质成分（英安岩至流纹英安岩）岩石的相互作用，这些岩石代表基底成分谱中的端元; 3）限制负责成矿的地球化学过程;以及4）评估岩浆流体在EMB热液系统中的作用。