Collaborative Research: BATHOLITHS: Generation and evolution of crust in continental magmatic arcs

合作研究：岩槽：大陆岩浆弧中地壳的生成和演化

• 批准号: 0309885
• 负责人: Mihai Ducea
• 金额: $ 80.31万
• 依托单位: University of Arizona
• 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 2008-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0309885&HistoricalAwards=false
• 关键词: Collaborative; Research; BATHOLITHS; Generation; evolution

0309885DuceaThe 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.

该项目的目标是确定是否存在基性岩-超基性岩基，以及这些基性岩基是否能够将地幔岩浆活动的基本玄武岩性质与地壳的中间平均成分相协调。 考虑两个假设：（1）致密超镁铁质残留物侵入地幔，留下上部的中间地壳成分;（2）残留物存在于莫霍面之下，与地幔橄榄岩在地震学上没有明显区别。 PI将使用中央海岸山脉岩石的岩石学，地球化学和地质年代学相结合的方法来跟踪源的变化，通过时间和地震和重力数据的起源深度，以成像岩石圈的现状。 在不列颠哥伦比亚省的中央海岸山脉岩石（CCRB）是一个非常好的位置，这项研究。 这是一个非常大的岩基，相对年轻，没有漫长的构造历史。 它的崎岖地形使其深度剖面达到20至25公里。