西北大学学报(自然科学版)
西北大學學報(自然科學版)
서북대학학보(자연과학판)
JOURNAL OF NORTHWEST UNIVERSITY(NATURAL SCIENCE EDITION)
2010年
1期
105-110
,共6页
钾长花岗岩%地球化学%锆石U-Pb定年%巴伦台地区%中天山
鉀長花崗巖%地毬化學%鋯石U-Pb定年%巴倫檯地區%中天山
갑장화강암%지구화학%고석U-Pb정년%파륜태지구%중천산
K-feldspar granite%geochemistry%Zircon U-Pb dating%Baluntai area%Middle Tianshan block
目的 探究新疆中天山巴伦台地区钾长花岗岩的地球化学特征、成岩年龄及其地质意义.方法 在详细的地质调查基础上,分析其主量、微量元素含量等地球化学特征,并利用锆石LA-ICP-MS U-Pb定年方法确定其成岩年龄.结果 钾长花岗岩具有火山弧花岗岩特征,形成年龄为369.6 Ma±2.6 Ma.结论 古生代南天山洋洋壳向伊犁一中天山微板块下的俯冲至少延续到晚泥盆世.
目的 探究新疆中天山巴倫檯地區鉀長花崗巖的地毬化學特徵、成巖年齡及其地質意義.方法 在詳細的地質調查基礎上,分析其主量、微量元素含量等地毬化學特徵,併利用鋯石LA-ICP-MS U-Pb定年方法確定其成巖年齡.結果 鉀長花崗巖具有火山弧花崗巖特徵,形成年齡為369.6 Ma±2.6 Ma.結論 古生代南天山洋洋殼嚮伊犛一中天山微闆塊下的俯遲至少延續到晚泥盆世.
목적 탐구신강중천산파륜태지구갑장화강암적지구화학특정、성암년령급기지질의의.방법 재상세적지질조사기출상,분석기주량、미량원소함량등지구화학특정,병이용고석LA-ICP-MS U-Pb정년방법학정기성암년령.결과 갑장화강암구유화산호화강암특정,형성년령위369.6 Ma±2.6 Ma.결론 고생대남천산양양각향이리일중천산미판괴하적부충지소연속도만니분세.
Aim To study the geochemistry characteristics, zircon U-Pb chronology and the geological significance of the K-feldspar granite in northem Baluntai area. Methods Based on the geological investigation, geochemistry analysis and LA-ICP-MS zircon U-Pb dating about the K-feldspar granite, the geological significance of the K-feldspar granite has been studied. Results The K-feldspar granite has the characteristics of island-arc granites, and formed at 369. 5 Ma±2. 6 Ma. Conclusion The paleo-southem Tianshan ocean lithosphere had been subducting beneath the Yili-middle Tianshan block from Silurian to late Devonian.