Crustal Recycling Versus Crustal Addition: The Role of Underplated Tholeiitic Rocks in the Origin of Reduced, Rapakivi-Type Granites

该项目的目的是确定在造山花岗岩生产过程中，地幔源岩浆在多大程度上被添加到大陆地壳中。本文将重点研究还原拉帕基型花岗岩。将检验它们起源的两种模式：(1)由演化的大陆地壳熔融产生；(2)由位于地壳底部或附近的分异拉斑岩浆部分熔融产生。现场区域是怀俄明州Laramide山脉Mule Creek区块的Sherman岩基。这项研究结合了野外工作、岩石地球化学、Nd、Sr和Pb同位素分析以及密集参数的确定。

9706237 Frost The purpose of the project is to determine the extent to which juvenile, mantle-derived magmas are added to the continental crust during production of anorogenic granites. This study will focus on the reduced rapakivi-type granites. Two models for their origin will be tested: (1) Production by melting of evolved continental crust and (2) production by partial melting of differentiated tholeiitic magmas emplaced at or near the base of the crust. The field area is the Sherman batholith in the Mule Creek block of the Laramide Mountains, Wyoming. This research combines field work, petrography geochemistry, Nd, Sr and Pb isotopic analyses, and determination of intensive parameters.