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首页> 外文期刊>Journal of Asian earth sciences >Weathering, recycling, hydraulic sorting and metamorphism/metasomatism implications of the NE Gondwana lower Cambrian-Lower Cretaceous siliciclastic succession of Jordan
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Weathering, recycling, hydraulic sorting and metamorphism/metasomatism implications of the NE Gondwana lower Cambrian-Lower Cretaceous siliciclastic succession of Jordan

机译：约旦东北冈瓦纳下寒武统—下白垩统硅质碎屑演替的风化，循环利用，水力分选和变质作用/变质作用意义

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摘要

Whole rock major elements, detrital and authigenic light, heavy, and clay minerals, and neoformed zeolite minerals of the NE Gondwana lower Cambrian-Lower Cretaceous siliciclastic succession of Jordan were investigated to evaluate the factors controlling the chemical composition of the sandstone. The provenance source rocks, controlled by the tectonic setting at the time of deposition of the subarkosic arenites and the quartzarenites were the principal mineral- and chemical-governing factor, followed by an interplay of chemical weathering, recycling, hydraulic sorting, diagenesis, and very-low grade metamorphism/hydrothermal metasomatism. The sandstone provenance was mainly granitoids of the Arabian Shield formed during the Neoproterozoic Gondwana amalgamation, and minor Paleozoic and Mesozoic siliciclastic strata. High CIA and low WIP weathering index values indicate an intensive chemical weathering event that affected the provenance during the early Cambrian-Middle Ordovician, and gave rise to mature first-cycle quartzarenites. High CIA/WIP and SiO2/Al2O3 ratios indicate a pronounced recycling in the Early Cretaceous responsible for super mature second-poly-cycled quartzarenites. The subarkosic arenites were formed either under a thorough chemical weathering, coupled with a high rate of erosion and a rapid deposition in adjacent braidplains, or an arid, glacial climate devoid of chemical weathering. Hydraulic sorting caused enrichment of Al and K in the detrital clay minerals, Ti in the silt-sized Ti-bearing minerals and Si in the sand-sized quartz. The very low-grade metamorphism/hydrothermal metasomatism, recorded here for the first time, is indicated by illite crystallinity (IC = 0.36 degrees 2 theta), illite-sericite-muscovite transformation, zeolites-apatite-authigenesis, and alteration of monazite and titanite-ilmenite into thorite and leucoxene/hematite.
机译：研究了约旦NE冈瓦纳下寒武统—下白垩统硅质碎屑演替的全岩石主要元素，碎屑和自生轻，重和粘土矿物，以及新形成的沸石矿物，以评估控制砂岩化学成分的因素。物源烃源岩在次深层砂岩沉积时受到构造环境的控制，而石英亚砷酸盐是主要的矿物和化学控制因素，其后是化学风化，循环利用，水力分选，成岩作用和非常重要的相互作用。 -低品位变质/热液交代。砂岩物源主要是新元古代冈瓦纳合并期间形成的阿拉伯盾构的花岗岩类，以及较小的古生界和中生界碎屑岩地层。高CIA和低WIP风化指数值表明发生了强烈的化学风化事件，影响了寒武纪-中奥陶纪早期的物源，并形成了成熟的第一周期石英亚砷酸盐。较高的CIA / WIP和SiO2 / Al2O3比表明在早白垩世有明显的再循环作用，这是第二成熟的多聚石英亚砷酸盐的超级成熟。暗区亚芳族沉积物是在充分的化学风化作用下形成的，再加上高速率的侵蚀和在相邻编织带中的快速沉积，或者在没有化学风化作用的干旱冰川气候下形成。水力分选导致碎屑粘土矿物中的Al和K富集，粉砂大小的含Ti矿物中的Ti富集，而沙粒状石英中的Si富集。此处首次记录的极低品位变质/水热交代作用由伊利石结晶度（IC = 0.36度2 theta），伊利石-绢云母-白云母转变，沸石-磷灰石-自生，以及独居石和钛钛矿的变化指示-钛铁​​矿变成石和次氯代/赤铁矿。

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