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Published in:
2005 | OriginalPaper | Chapter
Simple deposition versus replacement and re-equilibration at the Crescencia Ni-(Co-U) deposit (Central Pyrenees, Spain)
Authors : I. Fanlo, I. Subías, J. Manuel, A. Paniagua, S. Morales
Published in: Mineral Deposit Research: Meeting the Global Challenge
Publisher: Springer Berlin Heidelberg
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The mineral assemblage of the Crescencia mine contains Ni sulfarsenides, arsenides and diarsenides, uraninite and pyrite. Three stages of mineral deposition can be distinguished: Stage I: nickeline, gersdorffite I, and rammelsbergite; Stage II: gersdorffite II; Stage III: uraninite. Gersdorffite II has been subdivided into six groups on the basis of textural and compositional criteria. Some of these gersdorffite types are clearly pertained to disequilibrium processes. Gersdorffite B, C, E and F represent intermediate steps during the nickeline replacement and progressive re-equilibration with residual fluids, representing by gersdorffite D. Thus, compositional variations found in gersdorffite are the result of nickeline replacement and reequilibration processes rather than a direct precipitation under different conditions of the ore-forming fluids.