摘要
Abstract
The layer of Angeeryinwula Formation is widely exposed in the Bayanaobao area,Inner Mongolia,The 31 lithium single element anomalies determined by the 1∶50,000 soil geochemical measurement work are in good agreement with the range of Angeeryinwula Formation. The enrichment of lithium of the Angeeryinwula Formation is closely related to the primary sedimentation of the layer, and there is no secondary enrichment occurs.The source of its lithium element is related to the erosion and dissolution of lithium in mafic volcanic rocks,which is proven by the Study on the source area of clastic and sedimentation in the layer of Angeeryinwula Formation. The dissolved lithium is adsorbed by clay minerals in the debris and then deposited into diagenetic rocks, and which resulted in widespread geochemical anomalies of lithium soils in the area. Then the author inferred that there was a large-scale intermediate-basic volcanic activity in the Late Devonian and even earlier in the research area, and there should be a large-scale ancient volcanic mechanism. On the basis of this research, a new sedimentary lithium-ore mineralization model is proposed, that is, the clastic rock formation with high clay mineral content around the ancient volcanic mechanism can possess the condition of lithium-rich integrated ore under certain tectonic background and sedimentary environment.关键词
锂元素/土壤地球化学异常/碎屑物源区/粘土矿物/古火山机构/内蒙古Key words
lithium element/soil geochemical abnormal/source area of the clast/llay minerals/ancient Volcano mechanism/Inner Mongolia分类
天文与地球科学
