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准噶尔盆地顶山地区乌伦古河组砂岩元素地球化学特征及其地质意义 被引量:4

Geochemical Characteristics and Their Geological Signification of Wulunguhe Formation in Dingshan area,Junggar basin
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摘要 准噶尔盆地顶山地区乌伦古河组发育有砂岩型铀矿化,为对进一步勘探提供理论依据,详细研究了铀矿化的物源,探讨了成矿地质背景。本文对采自顶山地区的32件样品进行了详细的元素地球化学研究。结果表明,乌伦古河组砂岩组分受源岩控制,经历了较弱的沉积再循环作用,物源距离适中;沉积物源为长英质火山岩和安山岩混合来源;沉积物源区为大陆岛弧构造背景。综合分析认为:寒武纪-早志留世,北准噶尔洋伸展-消减旋回,形成了加里东期大陆岛弧中性-酸性侵入岩体;晚志留世-早石炭世,克拉美丽有限洋盆拉张聚敛旋回,形成了海西期大陆岛弧中性-酸性侵入岩体。新第三纪加里东期和海西期大陆岛弧中性-酸性侵入岩体遭受风化剥蚀,于乌伦古凹陷沉积形成乌伦古河组碎屑沉积岩。 Sandstone-type uranium mineralization were developed in the Wulunguhe Formation at the Dingshan area, Junggar basin. The sedimentary provenance and tectonic setting are carried out in order to understanding the exploration potential in the area. In these study, 32 samples were performed for elemental geochemistry analyses. The results show that composition of such sedimentary rocks is dominantly originated tom felsic volcanic rocks and andesite in continental island arc. The North Junggar Ocean was developed in Cambrian-Early Silurian period and formed intermediate-felsic intrusions in Caledonian continental area, whereas the Kalameili Ocean experienced extension-compression cycle and formed intermedi- ate-felsic plutons at the variscan continental arc. In Neogene, weathering and erosion of rocks of both arcs resulted in the deposition at the Wulugu area, forming the Wuluguhe Formation.
出处 《矿物岩石地球化学通报》 CSCD 北大核心 2017年第6期1026-1033,共8页 Bulletin of Mineralogy, Petrology and Geochemistry
基金 中国地质调查局项目(DD20160201)
关键词 准噶尔盆地 顶山地区 乌伦古河组 元素地球化学 物源 构造背景 Junggar basin Dingshan area Wulunguhe Formation geochemistry of element provenance tectonic setting
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