岩石矿物学杂志2017，Vol.36Issue(3)：343-359,17.
川西冕宁-德昌稀土矿带正长岩-碳酸岩杂岩体中锆石矿物学特征与矿化过程
Mineral characteristics of zircons in the syenite-carbonatite complex in the Mianning-Dechang REE ore belt, Sichuan Province, SW China:Indicative of REE mineralization
摘要
Abstract
All REE deposits in the Mianning-Dechang REE ore belt of westem Sichuan Province are closely related to syenite-carbonatite complex in genesis.Despite the similar geological backgrounds,syenite-carbonatite complexes have various occurrences.Also,various types of zircons in these syenites rather than carbonatite exhibit the forms of fresh zircons (type Ⅰ),recrystallization zircons (type Ⅱ),hydrothermal fluid altered zircons (type Ⅲ),and ore-forming fluids altered zircons (type Ⅳ).All these types of zircons were examined carefully by BSE images,CL images,Raman spectra,EMPA,and some other means.Type Ⅰ and type Ⅱ zircons have nearly identical crystal structures,chemical composition and BSE images,with edges of Type Ⅱ zircons being recrystallized and having well-developed crystal structure because of their smaller full-widths at half-maximum FWHM;type m zircons have the murky transmissive images,destroyed sieve texture and more increased FWHM,some thorite inclusions and decreased Zr and relatively high content of U,Th,Hf,Ce;type Ⅳ zircons have experienced more serious alteration by ore-forming fluids with many thorite inclusions,more destroyed sieve texture and the most increased FWHM,and high concentrations of U,Th,Hf as well as La,Ce,Nd,Sm.Different zircons show various morphologies,inclusions,degrees of destroyed texture and isomorphous substitutions between U,Th,Hf,Ce and Zr,which,in turn,suggests the evolution from magmatic to hydrothermal processes in the formation of REE deposits.关键词
冕宁-德昌/稀土矿带/锆石矿物学特征/正长岩-碳酸岩杂岩体/稀土矿化Key words
Mianning-Dechang/REE belt/mineral characteristics of zircons/syenite-carbonatite complex/REE mineralization分类
天文与地球科学引用本文复制引用
郭东旭,刘琰,陈超,姜恒,李自静,李德良,马旺..川西冕宁-德昌稀土矿带正长岩-碳酸岩杂岩体中锆石矿物学特征与矿化过程[J].岩石矿物学杂志,2017,36(3):343-359,17.基金项目
中国地质科学院基本科研业务费(YWF201509,YWF201705) （YWF201509,YWF201705）
中国地质调查项目(1212011020000150011-03)Research Funds for the Chinese Academy of Geological Sciences(YWF201509,YWF201705) （1212011020000150011-03）
Geological Survey Program of China Geological Survey(1212011020000150011-03) （1212011020000150011-03）
