• journal_title：Geological Society of America Bulletin
• Contributor：Chuan-Lin Zhang ; Zheng-Xiang Li ; Xian-Hua Li ; Yi-Gang Xu ; Gang Zhou ; Hai-Min Ye
• Publisher：Geological Society of America
• Date：2010-
• Format：text/html
• Language：en
• Identifier：10.1130/B30007.1
• journal_abbrev：Geological Society of America Bulletin
• issn：0016-7606
• volume：122
• issue：11-12
• firstpage：2020
• section：GEOCHEMISTRY

New sensitive high-resolution ion microprobe (SHRIMP) U-Pb zircon ages, geochemical data, and a synthesis of existing stratigraphic, geochronologic, and geochemical results from the Tarim block and the Central Asian orogenic belt in northwestern China suggest the presence of a Permian (ca. 275 Ma) large igneous province (the Bachu large igneous province). The large igneous province consists predominantly of coeval mafic rocks (basalts and mafic-ultramafic intrusions) having an aerial coverage of more than 600,000 km², and its formation was accompanied by voluminous emplacement of A-type granites. This large igneous province, interpreted to be of mantle plume origin, is ∼15 m.y. older than the ca. 260 Ma Emeishan large igneous province in southwestern China and ∼25 m.y. older than the 251 Ma Siberian Trap in Russia. Such a sudden flair up of plume activity in the Permian may represent the early stage of the Pangean superplume event. The Permian plumes likely played a role in late Paleozoic rapid continental crustal growth in the Central Asian orogenic belt. In addition, there appear to be two types of mantle geochemical provinces (domains) in the region, a long-term enriched Tarim province and a subduction-metasomatized and depleted Central Asian orogenic belt province.