Vanadium rich Fe-Ti oxide and Cu-sulphide mineralization in Paleoproterozoic Mangikhuta volcanics, Central Indian Craton: metallogenic and petrogenetic implications

Sunil Kumar Khare , Anil D Shukla , Akella S Venkatesh
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Abstract

This study reports for the first time, Fe-Ti-V oxide and Cu-sulphide mineralization in Paleoproterozoic Mangikhuta basalt Formation, central Indian craton. Electron microprobe and laser ablation analyses of Fe-oxides reveal high FeO (45–69 wt %), TiO2 (19–53 wt %), V (1860 - 4990 ppm), Zr (394–3130 ppm), Nb (55–285 ppm) and Zn (324–668 ppm). Interelemental relationships of Fe-oxides reveal their magmatic origin. High concentration of lithophile elements in Fe-oxides besides V and Ni trends in incompatible element plots indicate their origin from mafic melt. High Cu content (269 and 314 ppm) in the host basalt samples along with chalcopyrite mineralization observed during ore petrography indicates sulphide saturation of Mangikhuta magma. The chondrite normalized rare earth element (REE) plots of the host rock samples are overall similar to the earlier reported Mangikhuta REE patterns, which indicates genetic relation of Fe-oxides and Cu-sulphides with Mangikhuta volcanism. Fe-oxide and Cu-sulphide mineralization in Mangikhuta basalt is related to hydrous and oxygen rich arc related mafic melt intrusion into the Khairagarh back arc basin. Sulphide saturation in Mangikhuta basalt was initiated due to precipitation of Fe-oxides from the evolved melt whereas addition of fresh batch of hydrous and oxygen rich melt derived from the arc-related mantle source increased oxygen fugacity of residual melt that resulted in alternate phases of high oxygen and Sulphur fugacity and precipitation of Fe-oxide and Cu-sulphides from the melt.

印度克拉通中部古生代曼吉库塔火山岩中的富钒铁钛氧化物和硫化铜矿化:金属成因和岩石成因的影响
本研究首次报道了印度克拉通中部古生代 Mangikhuta 玄武岩地层中的铁-钛-钒氧化物和硫化铜矿化现象。对氧化铁的电子微探针和激光烧蚀分析表明,氧化铁(45-69 wt %)、二氧化钛(19-53 wt %)、钒(1860 - 4990 ppm)、锆(394-3130 ppm)、铌(55-285 ppm)和锌(324-668 ppm)含量较高。铁氧化物的元素间关系揭示了其岩浆起源。除了不相容元素图中的钒和镍趋势外,铁氧化物中亲岩性元素的高浓度表明它们源自岩浆熔体。主玄武岩样本中的高铜含量(269 和 314 ppm)以及在矿石岩石学中观察到的黄铜矿化表明,曼吉库塔岩浆中硫化物饱和。主岩样本的软玉归一化稀土元素(REE)图总体上与早先报告的曼吉库塔稀土元素图相似,这表明铁氧化物和铜硫化物与曼吉库塔火山活动的遗传关系。Mangikhuta玄武岩中的氧化铁和硫化铜矿化与侵入 Khairagarh 后弧盆地的含水富氧弧状岩浆有关。Mangikhuta玄武岩中的硫化物饱和是由演化熔体中的氧化铁沉淀引起的,而从与弧有关的地幔源中新加入的一批富含水和氧气的熔体增加了残余熔体的氧气富集度,从而导致氧气和硫的高富集度交替出现,并从熔体中沉淀出氧化铁和硫化铜。
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