Ultra-High Pressure (20-40 Kbar) Metamorphism and Melting of Crustal Rocks

[972590] [qh]将要进行的研究包括确定在超高压变质作用条件下地壳岩石的熔融关系、熔体组分、熔体和抗蚀物组成。大部分实验工作将在30和40千巴的压力下进行，这是与超高压pm最相关的压力范围。还将进行一些20千巴的实验，目的是将30和40千巴的结果与PI在以前项目中已经完成的相同起始材料上的较低压力（15千巴）实验联系起来。研究的起始物质是来自喜马拉雅山脉的长英质变长岩和来自内华达山脉的钙碱性钠长石。这两种起始物质分别是大陆地壳中最丰富的沉积岩和火成岩的合适模型。实验将在不添加H2O（脱水熔融）和添加少量H2O的情况下进行。

9725190 Pati(o Douce The research to be performed consists of determination of the melting relations, melt fractions, and melt and restite compositions of crustal rocks at conditions characteristic of ultra-high pressure metamorphism. The bulk of the experimental work will be conducted at pressures of 30 and 40 kbar which is the most relevant pressure range for UHPM. A few experiments at 20 kbar will also be performed, with the objective of tying the 30 and 40 kbar results to lower pressure ((15 kbar) experiments on the same starting materials already completed by the PI in previous projects. The starting materials to be investigated are the felsic metapelite from the Himalayas and the calc-alkaline tonalite from the Sierra Nevada. These two starting materials are suitable models for the most abundant sedimentary and igneous rocks in continental crust, respectively. Experiments will be performed both without added H2O (dehydration melting) and with small amounts of added H2O.