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SHRIMP U-Pb Zircon Age of the Ka'erjiao Intrusion in the Sawur Region in West Junggar, Xinjiang
引用本文:ZHOU Taofa TAN Lugui FAN Yu YUAN Feng YANG Wenping HE Lixin YUE Shucang. SHRIMP U-Pb Zircon Age of the Ka'erjiao Intrusion in the Sawur Region in West Junggar, Xinjiang[J]. 《地质学报》英文版, 2007, 81(2): 322-329. DOI: 10.1111/j.1755-6724.2007.tb00955.x
作者姓名:ZHOU Taofa TAN Lugui FAN Yu YUAN Feng YANG Wenping HE Lixin YUE Shucang
作者单位:ZHOU Taofa(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei,Anhui 230009) ;TAN Lugui(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei,Anhui 230009) ;FAN Yu(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei,Anhui 230009) ;YUAN Feng(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei,Anhui 230009) ;YANG Wenping(No. 4 Geological Party,Xinjiang Bureau of Geological Exploration,Altay,Xinjiang 836500) ;HE Lixin(No. 4 Geological Party,Xinjiang Bureau of Geological Exploration,Altay,Xinjiang 836500) ;YUE Shucang(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei,Anhui 230009) ;
基金项目:安徽省自然科学基金杰出青年基金
摘    要:

关 键 词:新疆 西准噶尔 萨吾尔地区 喀尔交 侵入岩 SHRIMP U-Pb 锆石年代 花岗岩
收稿时间:2006-04-04
修稿时间:2006-07-10

SHRIMP U-Pb Zircon Age of the Ka''''erjiao Intrusion in the Sawur Region in West Junggar, Xinjiang
ZHOU Taofa,TAN Lugui,FAN Yu,YUAN Feng,YANG Wenping,HE Lixin,YUE Shucang. SHRIMP U-Pb Zircon Age of the Ka''''erjiao Intrusion in the Sawur Region in West Junggar, Xinjiang[J]. Acta Geologica Sinica (English Edition), 2007, 81(2): 322-329. DOI: 10.1111/j.1755-6724.2007.tb00955.x
Authors:ZHOU Taofa  TAN Lugui  FAN Yu  YUAN Feng  YANG Wenping  HE Lixin  YUE Shucang
Abstract:Acid intrusions are widespread in the Sawur region, Xinjiang. The Ka'erjiao intrusion is mainly composed of albite granite porphyry, K-feldspar granite porphyry, ivernite and granite porphyry. Being a transitional product between magma intrusion and eruption in the Sawur region, the Ka'erjiao intrusion was formed at the telophase of the late Carboniferous to the begining of early Permian as determined by the SHRIMP U-Pb zircon dating, with an age of 302.6±7.6 Ma (1σ). The intrusion consists of alkali-enriched rock, whose REE distribution patterns are of the LREE enrichment type, the δEu value is Iow and Nd, Sr, Pb isotopes reflect its mantle source characteristics. The δ18O value of intrusion is low as a result of isotope exchange with meteoric water.The geochemical characteristics show that it was formed in a post-collisional tectonic setting. Taking combined considerations of current studies of A-type granites and Permian volcanic rocks, we think that in the telophase of the late Carboniferous to the beginning of the early Permian, the Sawur region was within the extension or compressional to extensional period of a post-collisional stage. The Ka'erjiao intrusion from mantle sources can confirm the vertical continental crust growth in the late Paleozoic. The Sawur region in west Junggar is consistent with east Junggar in post-collisional tectonic evolution process.
Keywords:granite   zircon   SHRIMP data   post-collision   Sawur region   Xinjiang
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