Ti粒硅镁石（Tichondrodite）和Ti斜硅镁石（Ticlinohumite）属于硅镁石族矿物，是高温高压实验室合成的高密度含水富镁硅酸盐物相（DHMS）中唯一 发现和被证实的高压-超高压变质矿物（Wunder, 1998）。目前已在多个超高压变质带中报道，是超基性岩高压-超高压变质指示矿物之一。该申请拟对在西南天山超高压变质带中新发现的含Ti粒硅镁石、Ti斜硅镁石蛇纹岩开展深入的岩石学研究，确定其野外分布特征及其与超高压变质榴辉岩和片岩的关系，确定其变质作用演化、峰期变质矿物组合及其温压条件和PT轨迹，确立其岩石地球化学特征、原岩形成年龄和变质时代，建立其岩石学成因模式。该项研究对于确立和完善洋壳冷俯冲带高压-超高压变质反应系列、探讨天山造山带的形成与演化都具有重要研究意义。

Tichondrodite and Ticlinohumite are the minerals of humite group, which are only minerals discovered in HP-UHP metamorphic rocks among the Dense Hydration Maganisian Silicates synthesized in the lab. As the index minerals, Tichondrodite and Ticlinohumite have been reported in several UHP belt until now. This project plans to do the petrological study on the Tichondrite and Ticlinohumite-bearing serpentinite from Southwestern Tianshan UHP belt, China. The main purpose of this project is to determine the distribution of Tichondrite and Ticlinohumite-bearing serpentinites and their relationship with coesite-bearing eclogite and garnet phengite schist in Southwestern Tianshan, to calculate their peak metamorphic PT conditions and PT path, to analyze the geochemical characteristics of their protoliths and their ages including protolith's and metamorphic ages, to establish their petrogenesis and tectonic implication in oceanic-type UHP belt of southwestern Tianshan. This study should be very significance to establish the HP-UHP metamorphic facies of ultramafic rocks in clod subduction zone, and to discuss the formation and tectonic evolution of Chinese Tianshan orogenic belt.