关键词: 塔里木, 志留系, 碎屑锆石, 物源, LA-ICP-MS年龄, 超大陆

Abstract: The analysis of sedimentary material source of Silurian plays an important role in petroleum exploration and the evolution of Precambrian basement,the UPb isotopic age of zircons from clastic rocks in Tarim basin is determined in situ by LA-ICP-MS，it is indicated there are four periods of sedimentary source ages in Silurian,i.e.,700～900Ma，400～500Ma，1450～1650Ma，2000～2200Ma.It is showed that in all of the Silurian clastic rocks,there is Neoproterozoic sedimentary source，and there is Paleoproterozoic source in central Tarim area，Ordovician and the early Mesoproterozoic sources are detected in northern and eastern area in the Tarim Basin.There are obvious difference source regions and source ages of Silurian in different areas.The igneous rocks of Ordovician in Altun Tagh are the main sources of Silurian in eastern area，and KuqaNorthern Precambrian basement uplift is the main material source of Silurian in northern area，and the sedimentary source of central area comes from the Southern uplift Precambrian basement.It is indicated that there was not uniform Tarim basement in Paleoproterozoic and Mesoproterozoic from the date of the zircon age，and in the North and South Tarim continents,there are the different evolution events,in the North Tarim continent,there is possibly the same tectonic event as the breakup of Columbia supercontinent.The North and South Tarim continental collision happened in the early Neoproterozoic,about 900Ma,and uniform Tarim basement formed，and the large scale breakup of the Tarim occurred about 760Ma which caused widespread denudation area for clastic rocks in the basin.It also demonstrates that there was the same assembly and breakup history as Rodinia supercontinent in Neoproterozoic.

Key words: Tarim, Silurian, detrital zircon, material source, LA-ICP-MS age, supercontinent