Zircon U-Pb ages and geochemical features of granites in Dulan area,Eastern Kunlun mountains
2015; Chinese Physical Society; Linguagem: Inglês
ISSN
1000-6281
Autores Tópico(s)Geological Studies and Exploration
ResumoPorphyry deposits have been found in Dulan area of the tectonic magmatic belt in eastern section of East Kun Lun over the past years but the degree of geological work and research for the deposit was quite low due to the limitation of natural conditions. The hosted rocks in the mining area of Eastern Kunlun were dominated by granite. This paper presents zircon U-Pb age data and geochemistry study of hosted rocks using laser ablation ICP-MS technique,which shows that the granite of Dunlan belongs to high-Kcalc-alkaline peraluminous granite. The geochemical analysis results of 10 granite samples show that Al2O3,Fe2 O,Mg O,Ca O,P2O5,Ti O2 with Si O2 have the similar linear correlation trend. The results of the main elements,trace elements and rare elements show that the samples have the same origin. The zircons of granite present mainly euhedral and hypidiomorphic texture,with clear ring developed and high TH / U ratio,which are magmatic zircons. The results show that the intrusion mainly comes from late hercynian indosinian period with206 Pb /238 U average weighted age of(246. 0 ± 1. 1) Ma,(243. 4 ± 2. 8) Ma,(242. 1 ± 7. 9) Ma. East Kunlun region in the indosinian period indeed witnessed large-scale magmatism event.
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