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Pre‐Klondikean oxidation prepared the ground for Broken Hill‐type mineralization in South Africa
Terra Nova ( IF 2.4 ) Pub Date : 2020-10-12 , DOI: 10.1111/ter.12502 Stefan Höhn 1 , Hartwig E. Frimmel 1, 2 , Vinciane Debaille 3 , Westley Price 4
Terra Nova ( IF 2.4 ) Pub Date : 2020-10-12 , DOI: 10.1111/ter.12502 Stefan Höhn 1 , Hartwig E. Frimmel 1, 2 , Vinciane Debaille 3 , Westley Price 4
Affiliation
New Cu isotope data obtained on chalcopyrite from the Black Mountain and the Broken Hill deposits in the medium‐ to high‐grade metamorphic Aggeneys‐Gamsberg ore district (South Africa) require a revision of our understanding of the genesis of metamorphic Broken Hill‐type massive sulphide deposits. Chalcopyrite from both deposits revealed unusually wide ranges in δ65Cu (−2.41 to 2.84‰ NIST 976 standard) in combination with distinctly positive mean values (0.27 and 0.94‰, respectively). This is interpreted to reflect derivation from various silicate and oxide precursor minerals in which Cu occurred in higher oxidation states. Together with the observation of a typical supergene base metal distribution within the deposits and their spatial association with an unconformity only meters above the ore horizon, our new data are best explained by supergene oxidation of originally possibly SEDEX deposits prior to metamorphic sulphide formation, between the Okiepian (1,210–1,180 Ma) and Klondikean (1,040–1,020 Ma) orogenic events.
中文翻译:
克朗代克山前的氧化为南非碎山型矿化奠定了基础
从中高档变质Aggeneys-Gamsberg矿区(南非)的黑山和破碎山矿床的黄铜矿获得的新铜同位素数据,需要对我们对变质破碎山型块体成因的理解进行修订。硫化物矿床。从两个矿床铜矿异常透露宽范围δ 65Cu(-2.41至2.84‰NIST 976标准)结合明显的正平均值(分别为0.27和0.94‰)。这被解释为反映了各种硅酸盐和氧化物前体矿物的衍生,其中铜以较高的氧化态存在。结合对矿床内典型的超基性贱金属分布的观察以及它们与仅在矿层上方几米的不整合面的空间联系,我们的新数据可以通过在变质硫化物形成之前,原始可能的SEDEX矿床的超基因氧化来最好地解释。 Okiepian(1,210–1,180 Ma)和Klondikean(1,040–1,020 Ma)造山事件。
更新日期:2020-10-12
中文翻译:
克朗代克山前的氧化为南非碎山型矿化奠定了基础
从中高档变质Aggeneys-Gamsberg矿区(南非)的黑山和破碎山矿床的黄铜矿获得的新铜同位素数据,需要对我们对变质破碎山型块体成因的理解进行修订。硫化物矿床。从两个矿床铜矿异常透露宽范围δ 65Cu(-2.41至2.84‰NIST 976标准)结合明显的正平均值(分别为0.27和0.94‰)。这被解释为反映了各种硅酸盐和氧化物前体矿物的衍生,其中铜以较高的氧化态存在。结合对矿床内典型的超基性贱金属分布的观察以及它们与仅在矿层上方几米的不整合面的空间联系,我们的新数据可以通过在变质硫化物形成之前,原始可能的SEDEX矿床的超基因氧化来最好地解释。 Okiepian(1,210–1,180 Ma)和Klondikean(1,040–1,020 Ma)造山事件。