| Oxygen Isotope Studies of Epithermal Systems：A Review |
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| 引用本文： | 熊永良,翟裕生.Oxygen Isotope Studies of Epithermal Systems：A Review[J].中国地球化学学报,1992,11(4):329-343. |
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| 作者姓名： | 熊永良 翟裕生 |
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| 作者单位： | [1]DepartmentofGeology,UniversityofAlberta,Edmonton,AlbertaT6G2E3,Canada [2]DepartmentofGeologyandMineralRe,UniversityofAlberta,Edmonton,AlbertaT6G2E3,Canada |
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| 摘 要： | Numerous stable isotope studies of whole rocks and mineral separates in epithermal systems indi-cate that even though meteoric waters are dominant components in epithermal systems ,fluids of other origins,such as sedimentary or meta-sedimentary fluids,magmatic waters and even evolved meteoric waters ,may also play a role in the formation of epithermal ore deposits.Usually the more depleted the wall rocks,the larger the size of ore deposits ,and the least depletion degrees in whole rocks for economic mineralization are by about 3.5‰.The depletion in δ^18O in wall rocks,however,may be complicated by the superimposition of low temperature-hydration over high-temperature altera-tion or vice versa,the existence of primary low-^18O and high-^18O magmas ,and alteration by vol-canic gases.The depletion in δ^18O in wall rocks is controlled by the composition and nature of flu-ids,the temperature of fluids,the elevation of rocks at the time of alteration ,lithology,boiling effects of fluids ,and alteration style,as well as by water/rock ratios.In addition ,the fluids re-sponsible for epithermal deposits have experienced positive δ^18O shifts .It seems that when the above complications and controlling factors are well defined,oxygen isotope studies would be a promising and powerful exploration tool.
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| 关 键 词： | 氧同位素 岩石 矿物 浅成热液 沉积流体 岩浆 金属矿床 稳定同位素 |
Oxygen isotope studies of epithermal systems: A review |
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| Yongliang Xiong,Yusheng Zhai.Oxygen isotope studies of epithermal systems: A review[J].Chinese Journal of Geochemistry,1992,11(4):329-343. |
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| Authors: | Yongliang Xiong Yusheng Zhai |
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| Institution: | (1) Department of Geology, University of Alberta, T6G2E3 Edmonton, Alberta, Canada;(2) Department of Geology and Mineral Resources, China University of Geosciences, 100083 Beijing |
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| Abstract: | Numerous stable isotope studies of whole rocks and mineral separates in epithermal systems indicate that even though meteoric
waters are dominant components in epithermal systems, fluids of other origins, such as sedimentary or meta-sedimentary fluids,
magmatic waters and even evolved meteoric waters, may also play a role in the formation of epithermal ore deposits. Usually
the more depleted the wall rocks, the larger the size of ore deposits, and the least depletion degrees in whole rocks for
economic mineralization are by about 3.5‰. The depletion inδ
18O in wall rocks, however, may be complicated by the superimposition of low temperature-hydration over high-temperature alteration
or vice versa, the existence of primary low-18O and high-18O magmas, and alteration by volcanic gases. The depletion inδ
18O in wall rocks is controlled by the composition and nature of fluids, the temperature of fluids, fractures, the elevation
of rocks at the time of alteration, lithology, boiling effects of fluids, and alteration style, as well as by water/rock ratios.
In addition, the fluids responsible for epithermal deposits have experienced positiveδ
18O shifts. It seems that when the above complications and controlling factors are well defined, oxygen isotope studies would
be a promising and powerful exploration tool.
Visiting scholar from China University of Geosciences, Beijing. |
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