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Crystal chemistry and oxidation state of one euhedral Cr-spinel crystal enclosed in a bauxite layer (Trieste Karst: NE Italy): some considerations on its depositional history and provenance

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The singular occurrence of a well-preserved euhedral crystal of Cr-spinel has been recognised in a Late Maastrichtian-?Paleocene bauxite layer. Microanalysis and X-ray structural refinement were carried out on the single crystal: determination of oxygen atomic position and electron density in structural sites revealed that this sample did not undergo any oxidation process; this fact may signify that it was wind-blown and deposited after bauxitisation. Chemical parameters, TiO2 contents and compositional variations from core to rim suggest possible magmatic origin. Similarity with other Cr-spinels found in the coeval Julian Basin turbidites (SE Alps) was recognised.
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Document Type: Regular Paper

Publication date: May 1, 2002

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  • Beginning with 2005, Neues Jahrbuch für Mineralogy (Abhandlungen) publish all papers formerly submitted to the two subjournals Abhandlungen and Monatshefte.
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