Petrology and geochemistry of  Late Precambrian magmatic rocks from southern Jordan

. Tla v rudišču so danes pokrita z do dva metra debelo plastjo poplavnih sedimentov (volumen 680 m 3 ). Rudišče seka več naravnih votlin in s sigo zapolnjenih razpok, kakor tudi podorno dvorano v apnencu, katere izvor ni jasen. Iz ocene prostornine izkopa smo določili, da so v rudniku nakopali približno 1100 ton čistega železa. Mineraloške (rentgenska difrakcija) raziskave so pokazale, da je ruda pretežno goethitno-limonitna z opazno vsebnostjo hematita. Geokemične (rentgenska fluorescenca) analize pa kažejo na zelo čist goethite, z vsega enim odstotkom nečistoč. Med elementi v sledovih so najbolj pogosti W (248 ppm), As (168 ppm) in Co (124 ppm) vseh ostalih pa je manj kot 37 ppm. Prejšnje raziskave so pokazale da se ruda razteza na površini ACTA CARSOLOGICA 37/2-3 - 2008 242 show the highest concentrations, with all others < 37 (Ba) ppm. Former prospecting results show that the deposit has a spatial extent of 300 x 200 m with a maximal thickness of about 10 m. Textural, mineralogical and geochemical criteria suggest that the ore body could be of speleogene origin, i.e. deposited in a hypogene, deep phreathic setting, possibly before regional uplift or even prior to the maximal burial depth. A possibly similar ore-body is for example described from the gigantic Lower Cretaceous and sand-filled cave of Wülfrath (North RhineWestphalia, Germany) (Drozdzewski et al. 1998).

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Petrology and geochemistry of Late Precambrian magmatic rocks from southern Jordan

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