Collaborative Research: Subduction and Exhumation of Ultrahigh-pressure Rocks: Field and Drilling Petrotectonic Studies in Eastern China

该项目将继续对在研究中国超高压（UHP）地层过程中获得的岩心和露头样品进行地球化学和年代学分析。 中国大陆钻探计划（CCSD）在苏禄海东海地区，提供了一个独特的机会，研究这一重要带的三维。 钻探工作刚刚结束，完成了几个浅孔和一个5公里深的钻孔。 大别-苏鲁带的野外研究和钻孔样品的初步研究为大陆物质的俯冲和折返过程以及高P -低T变质过程提供了许多新的认识，这是目前地球科学的一个“热点问题”。具体而言，大别-苏鲁缝合带似乎是世界上最好的地方之一，可以解决地壳岩石被带到100公里以上深处然后返回地表的条件，以及200公里深处的地幔岩石如何被运送到浅层并融入俯冲大陆板或山脉带的问题。 该项目是PI与中国同事长期合作的延续，他们在钻探中发挥了重要作用。 美国的主要作用是对钻芯样品进行详细的矿物学研究。

0506901LiouThis project will continue geochemical and chronological analyses of drill core and outcrop samples obtained in the course of studying an ultrahigh-pressure (UHP) terrane in China. The Chinese Continental Drilling Project (CCSD), in the Donghai area of the Sulu terrane, provides a unique opportunity to study this important belt in three dimensions. The drilling is just now winding up with the completion of several shallow holes and one 5-km deep borehole. Field studies of the Dabie-Sulu belt and the initial studies of borehole samples have provided many new insights into the processes involved in the subduction and exhumation of continental material and into the processes of high P - low T metamorphism; presently a "hot topic" in earth sciences. Specifically, the Dabie-Sulu suture zone appears to be one of the best places in the world to address the conditions under which crustal rocks are taken to depths of more than 100 km and then returned to the surface, as well as the question of how mantle rocks from depths of 200 km are transported to shallow depths and incorporated into subducted continental slabs or mountain belts. The project is the continuation of the PI's long term collaborations with Chinese colleagues who have played a major role in the drilling. The major US role involves detailed mineralogical studies of drill core samples.