| 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(1,2):138-144. |
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| 中文摘要:煎茶岭镍矿与同类矿床相比，具有特殊的地质、地球化学特征，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，成矿流体成分属于Ｍｇ￣（２＋）－ｅａ￣（２＋）－Ｎａ￣＋－Ｆ￣－（Ｃｌ￣－）型。根据Ｐｂ、Ｓｒ、Ｓ、Ｏ、比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 OFJIANCHALING Ni-DEPOSIT |
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| Abstract:Comparing with other similar depoits Jianchalins Ni deposit has some particular characteristics ingeolosy and geochemistry, The ore-bearing ultrabasic rocks have a Sm-Nd whole rock isochrom age ofabout 927Ma. The main metallogenetic epoch of Ni deposit has the similar to the intrufding age of thease later granite porphyry and the forming age of serpontinite , which is about 400Ma. The δ￣(34)S valuesof the sulfides in ore vary from+6. 1‰-+11.50‰ , which is different from those of meteoritic sul-fur. These results indicate that the sulfur in ore has a source other than ultrabasic magma. The δ￣(34)Svalues of sulfides in ore are similar to those of the later acidic rocks and country rocks, suggesting amixing resources.The δ￣(18)O、δD.δ￣(13)C values of the fluid inclusions in Py from the ore vary respotivelyfrom + 3. 27‰, + 9. 6‰ , 44. 1‰, 55. 9‰,,14. 85‰ 19. 25‰,and show a trend ofMixing of magma and strata. The fluid compositions belong to the type of Mg￣(2+)-Ca￣(2+)-Na￣+F￣- (Cl￣- ).In the light of the Pb.Sr .S. O .H .C isotopic data and REE , we suggest that the forniation of Jianchal-ing 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 ele-ments. We also provide a primary metallogenetic niodel. |
| keywords:Jianclialing Shaanxi Ni depoit metallogenesis metallogenic model stable isotope |
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