COLLABORATIVE RESEARCH: BATHOLITHS: GENERATION AND EVOLUTION OF CRUST IN CONTINENTAL MAGMATIC ARCS

合作研究：岩基：大陆岩浆弧中地壳的生成和演化

• 批准号: 0309945
• 负责人: Kenneth Dueker
• 金额: $ 39.56万
• 依托单位: University of Wyoming
• 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: 2003-09-01 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0309945&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; BATHOLITHS; GENERATION; EVOLUTION

0309945DuekerThe goal of this project is to establish the existence or absence of mafic-ultramafic roots to batholiths and whether such roots can reconcile the fundamentally basaltic nature of mantle magmatism with the intermediate average composition of the crust. Two hypotheses are considered: 1) that the dense ultramafic residue founders into the mantle leaving the intermediate crustal compositions above, or 2) the residue exists below the Moho and is seismologically indistinct from mantle peridotite. The PIs will use a combination of petrology, geochemistry and geochronology on the plutons of the Central Coast Range Batholith to track changes in source, depth of origin through time and seismic and gravity data to image the present state of the lithosphere. The Central Coast Range Batholith (CCRB) in British Columbia is a very good location for this study. It is a very large batholith which is relatively young and has not had a protracted tectonic history. It's rugged topography gives access to depth profiles of 20 to 25 km.

0309945DUEKER这个项目的目标是建立或缺乏镁铁质 - 紫tr虫的根部，以及这种根源是否可以使地幔岩浆主义的基本碱性性与地壳中等平均成分进行调和。 考虑了两个假设：1）稠密的超弱残留物创始人进入地幔中，留在上面的中间地壳组成，或2）残留物存在于Moho以下，并且在地幔橄榄岩上存在地震中的隐藏性。 PIS将在中央海岸范围浴利斯的岩石上使用岩石学，地球化学和地质学的结合，以跟踪源头的变化，通过时间和地震和重力数据的起源深度，以对岩石圈的当前状态进行图像。 不列颠哥伦比亚省的中央海岸山脉（CCRB）是这项研究的一个很好的地理位置。 这是一个非常大的浴地，相对年轻，没有持久的构造历史。 它是坚固的地形，可访问20至25公里的深度剖面。