The New Understanding Obtained from the Study of the Sediment Source in Southeastern of the Kongque River Slopes in the Middle-Late Ordovician

The analysis and research of heavymineral of the sandstone in southeastern of the Kongque River slopes of the Tarim basin in the Middle-Late Ordovician show that the stable heavy mineral composition of Kuruktag Outcrop samples is Zircon-Tourmaline-Garnet-Magnetite-Cheklimonite. The stable heavymineral composition of the well Kongque 1 is Zircon-Garnet-Tourmaline-Leucoxene. There are some differences between the two compositions, but the analytical results reflect the same characteristics of source rocks. The source rocks in the study area aremainly fromacid, in termediate-basicigneous rocks and some metamorphic rocks. They are mixed products. Through the analysis of the Seismic profiles, this paper hold the opinionthat the sediment source of the study a reacomes from the south (Altun Orogen) and the north (Kuruktag uplift). According to the "ZRT" index of the stable heavymineral, the sediments proved coming from south and northmetin area around the well Kongque 1, then migrated and deposited along theirownway.