RUI/Collaborative Research: Batholiths: Generation and Evolution of Crust in Continental Magmatic Arcs

该项目的目的是确定岩基中是否存在基性-超基性根，以及这些根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。考虑了两种假设：1)密集的超镁铁质残留物进入地幔，在上面留下中间的地壳成分，或者2)残留物存在于莫霍之下，并且在地震学上与地幔橄榄岩不明显。pi将结合岩石学、地球化学和地质年代学，对中央海岸山脉基岩的岩体进行研究，追踪其来源、起源深度随时间的变化，并利用地震和重力数据对岩石圈的现状进行成像。不列颠哥伦比亚省的中央海岸山脉基岩（CCRB）是进行这项研究的一个非常好的地点。这是一个非常大的岩基，相对年轻，没有漫长的构造历史。它崎岖的地形可以达到20到25公里的深度。

0310011RusmoreThe 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.