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《Acta Petrologica Sinica》 2010-05
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Fluid exsolution,evolution and mineralization in porphyry Cu-Mo deposit:A case study from the Aolunhua deposit,southern Da Xing'an Mts

MA XingHua1,CHEN Bin1**,LAI Yong1,DOU JinLong2 and ZOU Tao2,31.Key Laboratory of Orogenic Belts and Crustal Evolution,School of Earth and Space Sciences,Peking University,Beijing 100871,China 2.China Nonferrous Metals Resource Geological Survey,Beijing 100012,China 3.Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China  
This study presents some new discoveries of the porphyritic quartz in the Aolunhua Cu-Mo deposit,southern segment of Da Xing'an Mountains.Based on the study on the texture,genesis and fluid inclusions in porphyritic quartz,together with the characteristics of hydrothermal veins,the processes of fluids exsolution,evolution and mineralization have been revealed.Porphyritic quartzes are divided into two groups:(Ⅰ) individual porphyritic quartz and(Ⅱ) polycrystal quartz aggregate,characterized by widespread daughter minerals-bearing fluid inclusions,and are of a special product during magmatic-hydrothermal transition.Fluid inclusions data show that a H2O-CO2-Na-K-Ca-Fe-Cu-Ti-dominated initial fluid with high temperature(≥492℃) and high salinity(up to 47.6% ~58.7% NaCleqv) separates from magmatic system under the condition that pressure ≥115MPa and depth ≥4.3km.In hydrothermal stage,fluid boiling results from sharp decrease of pressure,coupled with temperature reduce,lead to large scale mineralization.Characteristics of minerals in veins and microthermometry data demonstrate molybdenite precipitation temperature is above 335℃.The uplift,supported by data of fluid inclusions in porphyritic quartzes,is more than 4.3km,indicating that the uplift rate is at least 32.6m/Ma.So,the porphyritic quartz can be used to guide exploration as an indicator of fluid exsolution from porphyry,and also provides significant constraints on regional geology evolution.
【Fund】: 国家“973”项目(2006CB403501);; 国家自然科学基金项目(40625005 40821002)联合资助
【CateGory Index】: P618.41
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