Collaborative Research: Primitive Magmatism and Crustal Genesis in an Island Arc

合作研究：岛弧中的原始岩浆作用和地壳成因

• 批准号: 0242585
• 负责人: Gene Yogodzinski
• 金额: --
• 依托单位: University South Carolina Research Foundation
• 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: 2004-10-15 至 2006-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0242585&HistoricalAwards=false
• 关键词: Collaborative; Research; Primitive; Magmatism; Crustal; Collaborative; Research; Primitive; Magmatism; Crustal

The main goals of this funded project are to test ideas about the origin of continental crust and the basic controls on the volcanic arc output of subduction zones. The western Aleutians contain high Mg# andesites that are very close in chemistry to the average continental crust. This award will support a field program of dredging in the Aleutian arc which is a good natural laboratory because it has never been rifted and shows a gradient of convergence angle from east to west, with strongly oblique convergence in the west. Further, there is a gradient in sediment "flux" along the arc, with the western Aleutians representing a global low-sediment content endmember. The program is aimed at obtaining more volcanic rock samples from the western Aleutian arc in five distinct dredge areas. A 30-35 day multibeam, single channel seismic and sampling cruise (35-40 dredges total) will be undertaken, with bathymetric and SCS surveys prior to sampling. The budget includes costs for a minimal port-cruise program of analyses and 40Ar/39Ar dating of igneous rocks.

这个资助的项目的主要目标是测试有关大陆壳的起源以及俯冲带的火山弧输出的基本控制的想法。西部的阿留申族人包含高毫克＃安山矿，它们与平均大陆地壳非常接近。该奖项将支持阿留申弧中挖泥的现场计划，该计划是一个很好的天然实验室，因为它从未被淘汰，并显示了从东到西部的融合角度梯度，西方的倾斜度很大。此外，沿弧线的沉积物“通量”有一个梯度，西部的阿留申者代表着全球低水不平的内容的终点。该计划的目的是从五个不同的疏grodge地区获得更多的火山岩样品。将进行30-35天的多束，单道地震和采样巡航（总计35-40处），并在采样前进行了测深和SC调查。预算包括最小的港口灌溉计划的成本，以及火成岩岩石的40AR/39AR日期。