青海海德乌拉地区A型中-酸性火山岩成因及其铀成矿作用研究

研究表明，火山岩型铀矿床的赋矿火山岩主要是一套A型中性-酸性火山岩组合。在我国青藏高原发育的钾质火山岩中，存在大量A型富铀的中性-酸性火山岩组合，然而火山岩型铀矿床极为罕见。经过近三年勘探，在青海海德乌拉火山岩区发现中型规模的铀矿床。该矿床的发现，标志着在我国西北地区首次探明了与古生代火山岩有关的独立铀矿床，具有十分重要的科研及找矿意义。鉴于此，本项目选择海德乌拉地区火山岩型铀矿床作为研究对象，系统的开展火山岩岩石学、矿物学、地球化学、同位素和年代学研究，探讨火山岩的源区特征、岩浆作用过程；开展矿床地球化学研究，结合火山岩成岩时代和地球化学特征，探讨海德乌拉火山岩铀矿床成因，揭示海德乌拉地区火山岩与铀成矿之间的关系。这项研究不仅可以丰富火山岩铀矿床成因研究，加深对火山岩型铀矿床成矿作用的认识和理解，而且可以为我国西北地区铀矿找矿勘探提供一定的借鉴。

Previous studies reveal have shown that the ore-bearing volcanic rocks of volcanic-type uranium deposits are mainly A-type intermediate-acid volcanic rocks assemblage. The A-type uranium-rich intermediate-acid volcanic rocks assemblage are widespread during the potassic-ultrapotassic volcanic rocks of the Qinghai-Tibet Plateau, while uranium deposit is rarely present. After three years of exploration, a medium-sized uranium deposit was discovered in the Haidiwula volcanic area, Qinghai Province. The discovery of this deposit marks the first demonstration of an independent uranium deposit associated with Paleozoic volcanic rocks in northwest China, which is of great significance for uranium deposit study and prospecting. Therefore, this proposal deals with studies on the petrological, mineralogy, geochemical, isotopic and chronology of the volcanic rocks of the volcanic-type uranium deposit in the Haidewula area, to discuss their source material nature and magma process. Combined with the rock-forming age and whole-rock geochemistry of the volcanic rocks, the geochemical study of uranium deposit will be conducted to reveal the genesis of the Haidewula uranium deposit, and to discuss the relationship between volcanic rock and uranium mineralization. This study can not only enrich the genesis of A-type volcanic rocks, but also deepen the understanding and understanding of the formation of volcanic-type uranium deposit, and can also provide a reference for the prospecting and exploration of uranium deposits in northwest China.