| 李晓明.山东三山岛金矿床氧、氢碳稳定同位素的研究及其应用[J].地质找矿论丛,1988,(3):62-71 |
| 山东三山岛金矿床氧、氢碳稳定同位素的研究及其应用 |
| OXYGEN, HYDROGEN, CARBON STABLE ISOTOPIC STUDY OF SAN SHAN DAO GOLD DEPOSIT, SHANDONG PROVINCE |
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| DOI：10.6053/j.issn.1001-1412.1988.3. 007 |
| 中文关键词: 三山岛 金矿床 蚀变 氧.碳.氢 稳定同位素 同位素平衡 |
| 英文关键词: |
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| 中文摘要: |
| 三山岛金矿床位于山东省掖县境内,是我国著名的蚀变岩型原生金矿床之一。本文通过对该矿床中各类样品的氧、氧,碳稳定同位素研究,特别通过对各种产状石英的氧同位素“序列分析”,提出了山岛金矿床的矿液主要来自花岗岩浆热液,成矿温为400℃—300℃以下。在成矿作用后期,有少量大气水混,控矿断层上下盘的氧,氢稳定同位素成分的差异,表明其为正断层。 |
| 英文摘要: |
| San Shandao gold deposit, in east Shandong province, is one of the important Jiaojia-type network quartz vein gold deposit. The deposit is located in altered biotite granite belt of lower block of NE-trending fault which is developed in the granit coinciding with the contact zone between the granite arid partly migmatized precambrian metamorphic rocks （Jiaodong Group）. The high 18O/16O ratios of the granite probably reflect its crustal origin. The oxygen isotopic equilibrium betweeh quartz and alkali-feldspar in the granite was reached at temperature about 400℃ and so the δ18O value of coexisting solution at this time can be estimated on the basis of isotopic fractionation to be about 8‰ with that datum, the δ18O values of a series of gangue minerals （mainly quartz） in altered rock and veins could be interpreted--these minerals were formed by the solution, which came from magma, in the different stages with temperature decreasing. Hydrogen and carbon stable isotope data support this interpretation. The lighe element stable isotopic study also show that in the later stage of hydrothermal activities, some meteoric water probably entered into the alteration system, but has nothing to do with ore formation. The different features of oxygen and hydrgen isotopic compsition between the-upper and lower block of the ore-controling fault may related to the depth of them during alteration. The data of this paper show that the upper block was more shallow; i. e. the ore-controling fracturre belings to normal fault. |
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