| 煎茶岭镍矿床成矿作用特征 |
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| 关键词:Jianclialing Shaanxi Ni depoit metallogenesis metallogenic model stable isotope |
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| CHARACTERISTICS OF METALLOGENSIS OFJIANCHALING Ni-DEPOSIT |
| 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. |
| CHEN Min-yang,PANG Chun-yong,XIAO Meng-hua.1994.CHARACTERISTICS OF METALLOGENSIS OFJIANCHALING Ni-DEPOSIT[J].Acta Geoscientica Sinica,15(1,2):138-144. |
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