| 内蒙古额仁陶勒盖银矿水—岩相互作用及矿石沉淀氢氧同位素研究 |
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| 关键词:water-rock interaction H-O stable isotope Eren silver deposit |
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| A H,O STABLE ISOTOP STUDY ON THE WATER-ROCKINTERACTION AND MINERAL DEPOSITION IN THEEREN SILVER DEPOSIT, INNER MONGOLIA |
| A relatively systematic oxysen and hydrosen isetopic compositions of vein quartz and alteredreeks were analysed from the Eren silver deposit ,Inner Monsolia. The oxygen and hydrogen isotopic of55 altered reeks range from-4. 5‰t0,to +4. 7‰, and from-132‰, to 155‰, respectively.δ￣(18)Oof 6 vein quartzes vary from 0. 8‰ to 7. 3‰ with the δD values of 3 fluid inclusions chansingfrom-141‰,to-147‰. Such lowerδ￣(18)O and δD values indicate that the oreformins fluids formedat a meteoric water rock exchanse system. Vein quartzes have δ￣(18)O values lower than altered rocksconiparatiely showins the possible existins of twostage fluids.The fluid having oxysen isotopic compositions exisitions of around-5. 7‰ which formed at theearly stase durins mettoric waterreek interacted at the depth at below 300℃ with the effective W/Rratio of about 0. 4,then entered the upper mineralized system and interacted asain with the volcanicrocks(the second stase)and the effective W/R are about >5. 0. These processes produced the knownoxygen isotopic compositions of altered rocks, The quartz veins were formed by fissure-filling deposi-tions from fluids with δ￣(18)O values of about-16‰ and the fluids is related to the deep metoric waterinteracted with magmatite at below 300℃ with water to rock ratio of about 5. 0.The hydrogen isotopic compositions of 5 altered reeks are similar to or just a bit higher that thosefroin 3 quartz in quartz inclusion watere.The slightly higher hydrogen isotopic compositions of alteredreeks susgestins it is a hydrogen isotope dynamical fractionation which is probably the de-hydrogen ofthe boiling and diffusive preeess in epizonal environment. |
| ZHANG Li-gang,CHEN Zhen-sheng,LIU Jing-xiu,WANG Ke-fa,YU Gui-xiang,LIU Zhen-ming,ZHANG Yong-zhen.1994.A H,O STABLE ISOTOP STUDY ON THE WATER-ROCKINTERACTION AND MINERAL DEPOSITION IN THEEREN SILVER DEPOSIT, INNER MONGOLIA[J].Acta Geoscientica Sinica,15(1,2):131-137. |
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