矿床地质2009，Vol.28Issue(5)：663-672,10.
新疆东天山地区白山钼矿床的成因分析
A genetic analysis of Baishan molybdenum deposit in East Tianshan area, Xinjiang
摘要
Abstract
The Baishan molybdenum deposit is located in the eastern Juduotag tectonic belt of the East Tianshan Mountains. The wall rocks are biotite-felsic hornstone with well-developed mineralized quartz veins, belonging to Lower Carboniferous Gandun Formation (C_1g). The H, O compositions of the hydrothermal fluids in the quartz veins are as follows: δ~(18)O_(SMOW) values are 9.1‰～10.0‰ with an average of 9.425‰,δ~(18)O_(H_2O) balanced with quartz are 3.357‰～4. 257‰ with an average of 3. 682‰, and δD_(SMOW) are - 105‰～-69%, with an average of - 89.25‰. Characteristics of H, O isotopes indicate that the ore-forming hydrothermal fluid was dorninated by magmatic water with the participation of some evolutionary meteoric water that had experienced the water-rock in-teraction. The magmatic water supplied the main metaUogenic materials, and the evolutionary meteoric water served as an important factor for the precipitation of the metallogenic materials. The Re-Os isochronal age of molybdenites is (227.7± 4.3) Ma(MSWD=0.32), suggesting that the mineralization of the ore deposit took place in Middle Triassic. These geological and geochemical charac-eristics imply that the Baishan Mo deposit is a porphyry deposit, and its metallogenic materials mainly came from deep granitic rock. This paper deals with metallogenic background, and the authors hold that the Baishan molybdenum deposit was formed in a compres-sion environment after the post-collisional stage, and its mineralization was controlled by the distant effect of the Paleo-Tethys Ocean in Triassic. This paper has supplied a solid foundation for further researches on mineralization of granitoids which intruded into the same tectonic backgrotmd in Jueluotag block as well as in East Tianshan area.关键词
地质学/H、O同位素/Re-Os定年/成矿背景/白山钼矿床/东天山Key words
geology/H/O isotope/Re-Os isotopic dating/metaUogenic background/Baishan molybdenum deposit/East Tian-shan area分类
天文与地球科学引用本文复制引用
张达玉,周涛发,袁峰,范裕,刘帅,屈文俊..新疆东天山地区白山钼矿床的成因分析[J].矿床地质,2009,28(5):663-672,10.基金项目
本研究得到国家重点基础研究发展规划项目(200703411304、2001CB409800)、国家自然科学基金项目(40772057)和安徽省优秀青年基金项目(08040106907)共同资助 （200703411304、2001CB409800）
