Collaborative Research: Chemical Geodynamics of the Galapagos Mantle Plume-Spreading Center System
Collaborative Research: Chemical Geodynamics of the Galapagos Mantle Plume-Spreading Center System
批准号:
0241546
负责人:
Barry Hanan
金额:
$12.04万
依托单位国家:
美国
项目类别:
Standard Grant
财政年份:
2003
资助国家:
美国
项目状态:
已结题
起止时间:
2003-04-01 至 2007-03-31
中文摘要
这是与来自GEOMAR的德国科学家合作进行的一项研究,是2001年在R/V索内号上进行的MEGAPRINT考察的一部分。实地项目对东加拉帕戈斯扩张中心(GSC)的关键、未绘制地图的部分以及群岛和扩张中心之间的年轻海底部分进行了采样。该方案的内容包括多波束海底测绘、船上重力和磁力调查,以及通过沿东海隆沿着约15公里的间距以及在许多离轴海山和火山脊进行疏浚对熔岩进行取样。在已经完成的约100个主要元素玻璃分析的指导下,PI提出了一个分析计划,将确定这些海底玻璃和岩石的代表性套件的微量元素含量,He,Pb,Nd,Sr和Hf同位素组成,挥发性(CO2,H2O,Cl,F和S)含量和40 Ar-39 Ar放射性年龄。来自德国同事的地球物理数据将提供关于地壳和岩石圈的年龄、结构、厚度和构造的更多限制。
英文摘要
This is a collaborative study with German scientists from GEOMAR, as part of the MEGAPRINT expedition that took place aboard the R/V Sonne during 2001. The field program sampled critical, unmapped sections of the eastern Galapagos Spreading Center (GSC) and portions of young seafloor between the archipelago and the spreading center. Elements of the program included multi-beam seafloor mapping, shipboard gravity and magnetic surveys, and sampling of lavas by dredging at ~15 km spacing along the eastern GSC, and at numerous off-axis seamounts and volcanic ridges. Guided by ~100 major element glass analyses already completed, the PIs propose an analytical program that will determine trace element contents, He, Pb, Nd, Sr and Hf isotope compositions, volatile (CO2 ,H2O, Cl, F and S) contents and 40Ar-39Ar radiometric ages of a representative suite of these submarine glasses and rocks. Geophysical data from German colleagues will provide additional constraints on age, structure, thickness and tectonics of the crust and lithosphere.
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