| 煎茶岭镍矿床成矿作用特征 |
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| 引用本文：陈民扬,庞春勇,肖孟华.1994.煎茶岭镍矿床成矿作用特征[J].地球学报,15(z1):138-144. |
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| 中文摘要:煎岭镍矿与同类矿床相比,具有特殊的地质、地球化学物征，是一种特殊类型镍矿。本矿床流体包裹体同位素特征，表现出成矿体为岩浆与地层两端元混合趋势，成矿流体分属于Mg2+-Ca2+-Na+-F-(Cl-)型。根据 Pb、Sr、O、H、C 同位素及 REE资料，作者认为该镍矿的形成与后期酸性岩浆活动有密切关系，后期岩浆活动为成矿提供热力与热液，使成矿元素活化迁移、富集。本文最后提出了初步的成矿模式。 |
| 中文关键词:陕西煎茶岭镍矿 成矿作用 成矿模式 稳定同位素 |
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| Characteristics of metallogensis of jianchaling Ni-deposit |
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| Abstract:Comparing with other similar deposits Jianchaling Ni deposit has some particular characteristics in geology and geochemistry.The ore-bearing ultrabasic rocks have a Sm-Nd whole rock isochrom age of about 927Ma.The main metallogentic epoch of Ni deposit has the similar to the intrufding age of the age later granite-porphyry and the forming age of serpentinite,which is about 400Ma. The δ34S values of the sulfides in ore vary from +6.1‰-11.5‰,which is different from those of meteoritic sulfur. These results indicate that the sulfur in ore has a source other than ultrabasic magma.The δ34S values of sulfides in ore are similar to those of the later acidic rocks and country rocks, suggesting a mixing resources.The δ18O、δD、δ13C values of the fluid inclusions in Py from the ore vary respectively from +3.27‰-+6.9‰,-44.1‰--55.9‰,-14.85‰-19.25‰, and show a trend of Mixing of magma and strata. The fluid compositions belong to the type of Mg2+-Ca2+-Na+-F-(Cl-). In the light of the Pb、Sr、S、O、H、C isotopic data REE, we suggest that the formation of Jianchaling Ni deposit was connected with the later acidic magma activity intimately,which provided heat, hydrotheral ore-froming solution,causing remobilization and enrichment of the metallogenetic elements. We also provide a primary metallogenetic model.‰‰‰‰‰ |
| keywords:Jianchaling Shaanxi Ni deposit metallogenesis metallogenic model stable isotope |
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