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Mineralization is largely confined to an E-W-striking volcano-sedimentary sequence consisting of four lithological units that underwent extensive greenschist-facies metamorphism and deformation.All orebodies occur in stratiform or lenticular bodies within quartz–albitite and sericite–quartz schists, and are concordant with lithological contacts.Bornite and chalcocite had relatively higher Re and Os contents compared with chalcopyrite and pyrite.In the Archaean basement rocks of the Assynt and Gruinard terranes of the mainland Lewisian Complex in NW Scotland, a regional suite of quartz-pyrite veins cross-cut regional Palaeoproterozoic (Badcallian, 1760 Ma) and later brittle faults.Like the majority of the Irish Pb-Zn deposits, Lisheen is hosted by Lower Carboniferous strata, but the timing of sulfide mineralization is only poorly constrained by geochronologic methods due to the absence of minerals useful for dating by commonly-applied methods such as K-Ar, U-Pb and Rb-Sr.As such, the genetic models for this important type of sedimentary-hosted deposit remain controversial, with timing constraints provided primarily by geologic relationships and, more recently, paleomagnetic data.The hydrothermal mineral veins comprise a multimodal system of tensile/hybrid hydraulic fractures which are inferred to have formed during a regional phase of NW-SE extension.

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The absence of the veins in the Rhiconich Terrane is consistent with the suggestion that it was not finally amalgamated to the Assynt Terrane until the Laxfordian.A range of Olympic Dam whole-rock ores and sulfide mineral separates were analysed, together with the Roxby Downs Granite and its magnetite fraction (Table 3).The Re ( * 50–250 ppb) and Os ( * 3–8 ppb) contents for the whole-rock ore samples were the highest values obtained in this study.Chalcopyrite typically occurs with pyrite within the breccia matrix, with Cu values generally 5 3%.Magnetite in granitic clasts and isolated within the breccia matrix is commonly replaced by hematite, indicating that Cu precipitation was linked with redox processes and that Cu deposition was associated with hydrothermal fluid oxidation of the host-rock.This hypothesis is supported by Rhenium–Osmium dating of pyrite that yields an age of 2249 ± 77 Ma, placing the vein-hosted mineralisation event after the oldest published dates for the Scourie Dykes (2420 Ma), but before the youngest ages (1990 Ma).Sulphur isotope analysis suggests that the sulphur associated with the pyrite is isotopically indistinguishable from primitive mantle.The Tuolugou cobalt–(gold) deposit, in the northeastern margin of the Qinghai–Tibetan plateau and central part of the eastern Kunlun orogenic belt, is the most recently discovered, large, cobalt–(gold) discovery in Qinghai Province, NW China.Exploration to date has identified a cobalt resource of greater than 20,000 t Co, with significant potential for expansion. Please click on the service to which you have a subscription to obtain access.If you don't have a subscription, clicking will allow you to obtain pay-per-view access.Copper mineralisation in the Olympic Dam Breccia Complex can roughly be subdivided into two zones ( Figure 11): (1) Chalcopyrite zone: a lower and outer zone with primary hypogene mineralisation consisting of hematite þ chalcopyrite þ pyrite magnetite.Textural relationships suggest that Cu-sulfides either post-date or are coeval with hematite.The Irish Midlands region contains one of the world’s largest hydrothermal Zn-Pb ore districts, but uncertainty exists in the timing of mineralization relative to host rock ages.Consequently, genetic models for ore formation are poorly constrained and remain controversial.




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