华北克拉通早期大陆性质和演化

The aim of the project is to document rock assemblage, tectonics and early geological evolution of the North China cratonic basement. Combined with the compiled of geological map of the carton, several key metamorphic terrains, such as Hengshan, Wutai, Taihang, Lvliang etc., are investigated in detail for their structural deformation, metamorphism, geochemistry and isotopic geochronology research. The international collaborative efforts with USA, Germany and Australia are conducted for the project in the last four years. A suture zone from West Liaoning to East Hebei up to 600km long is identified for the first time, with the oldest ophiolite (2.50Ga) of the world well preserved. The podiform chromite discovered is suggested to be an important mark for the early ophiolite, providing crucial evidence for operation of Plate tectonics in the Archean.. Based upon metamorphic history of High-pressure granulite, the component for lower continental crust of North China and its uplifting process are reconstructed. It shows that Wutai-Hengshan are actually the coupled crustal level with comparable tectono-thermal history. The north China craton are mainly generated in the Neoarchean through TTG accretion and collision, followed by reworking in the Proterozoic. According to the structural analysis, tectonothermal constraint is suggested for the division on the limit between Archean and Proterozoic. The tectonic correlation between NCC and other cratonic blocks are also suggested. Finially, Neoarchean black smoker chimney and evaporite are discovered by the project, providing clues to the evolution of early Precambrian environment..

（1）华北北部变质基底构造区划，代表性变质岩石单元成因环境，早期重大构造热事件，舐降乜切灾始把莼Ｊ健＃?）太古代高压麻粒岩的区域构造特征、原岩性质，我国太古代典型大陆下地壳剖面基本特征，克拉通地壳的三维物质组成及深部过程。（3）华北克拉通坠乖旄窦芗捌溆胧澜绲湫涂死ㄔ缙诠乖煅莼员龋谠糯舐街衅春夏Ｊ降牡刂手圃肌