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首页> 外文期刊>Arabian journal of geosciences >Geochemical characteristics and uranium mineralization exploration potential of late Miocene molasse sediments of NW Himalayan foreland basin Pakistan
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Geochemical characteristics and uranium mineralization exploration potential of late Miocene molasse sediments of NW Himalayan foreland basin Pakistan

机译：NW Himalayan前陆盆地巴基斯坦后期内科泥泥浆沉积物的地球化学特征及铀矿化勘探潜力

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摘要

This study has defined the provenance, tectonic settings, paleo-weathering, sediment-recycling, and sandstone-type uranium mineralization potential of late Miocene mid-Siwalik Dhok Pathan Formation from Surghar-Shingar Range of NW-Himalayan foreland Fold-and-Thrust-belt. Twenty-six sandstone samples were analyzed on XRF and ICP-MS to determine concentrations of different geochemical species. These Himalayan molasse sediments are moderately rich in quartz. The other framework gains include igno-metamorphic and sedimentary lithic fragments (second in abundance after quartz), feldspars, and dominance of ferroan phlogopite (biotite) over white mica. Garnet, epidot, amphibole, magnetite, tourmaline, rutile, zircon, monazite, and uranothorite are present as common accessory minerals. These sandstones are generally classified as lithic arenite, greywacke, and arkose on the basis of geochemistry. These molasse sediments have recorded the signatures of first-cycle detritus mainly contributed by felsic-igneous rocks in collision-arc tectonic settings. Chemical index of weathering and alteration (CIW and CIA) revealed slight/low weathering of source areas. The REE patterns and Eu/Eu* values are also supporting felsic-igneous provenance for the studied samples. The median high concentrations (ppm) of vanadium (V 79.57), thorium (Th 10.08) and uranium (U 33.05) in sandstone, positive correlation of U with Al2O3 (r = 0.22), deposition in strong anoxic environments are the characteristic features of uranium enrichment/accumulation processes in sandstone-type environments thus signifying good potential for uranium exploration.
机译：本研究规定了出处，构造，古风化，沉积物回收，砂岩型铀矿化潜力，后期中西部中间思克·德霍克·达克·普国州NW-HIMALAYAN前陆折叠和推进 - 腰带。在XRF和ICP-MS上分析了二十六种砂岩样品，以确定不同地球化学物质的浓度。这些喜马拉雅蜕皮沉积物在石英中适度富含。其他框架增益包括Igno - 变质和沉积的岩石碎片（石英后的第二次），Ferroan Phlogopite（Biotite）在白色云母的菲尔达斯和占优势。 Garnet，Enicot，阳孔，磁铁矿，电气石，金红石，锆石，单一和铀素作为普通配件矿物质。这些砂岩通常在地球化学的基础上被归类为岩石芳香术，灰色瓦茨和雄蕊。这些蜕皮沉积物已经记录了初级碎屑的签名主要由碰撞构造环境中的铰接岩石源。风化和改变的化学指标（CIW和CIA）显示出源区的轻微/低风化。 REE模式和EU / EU *值也支持所研究样品的斜味起源。钒（v 79.57），钍（Th10.08）和铀（U 33.05）中的中值高浓度（ppm），砂岩中的阳性相关性，强缺氧环境中的沉积是沉积的砂岩型环境中的铀浓缩/积累过程因此表示铀勘探的良好潜力。

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