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Megacrystalline uraninite (up to one centimeter in size) represents one of the most important discoveries in uranium mineralogy in the western margin of the Yangtze Block and even in China in recent years. However, the genesis of megacrystalline uraninite remains controversial. In this study, the megacrystalline uraninite found in the felsic and quartz veins in the Haita area is examined for the first time. The study examined the geochemical characteristics of uraninite in the two veins and resulted in two primary findings. (1) The genesis of the uraninite was likely intrusive and was closely related to partial melting. (2) The quartz vein and feldspar vein are cogenetic and have a simple differentiation evolution relationship. Therefore, the partial melting of felsic materials during migmatization may be the most important mechanism of uranium mineralization in the study area. Furthermore, further simple fractional crystallization may be another important mechanism for the formation of megacrystalline uraninite. This study enriches the REE database of uraninite in uranium deposits worldwide, which is meaningful for studying the genesis of megacrystalline uraninite. [ABSTRACT FROM AUTHOR]

The article discusses the geological features and metallogenic process of the Erligou Gold Deposit, Sichuan Province, China. Topics discussed include presence of magmatic activities and favorable geographical setting for ore controlling; exposure of gold bearing quartz veins to groundwater; and display of toughness by the ore-bearing deposits in compression shear stress from different directions.

The article discusses the mineralization process of Huangjinping Gold Deposits in China. Topics discussed include testing of samples of trace elements such as quartz, pyrite and granitic mass; display of low rare earth elements pattern by auriferous pyrites; and formation of stable fracture surface by granite pluton under compressive stresses.

The article focuses on a study that investigates geochemical characteristics of rare earth elements (REE) of Baijintaizi gold deposit in Kang Ding County, Si Chuan Province, China. The study mentions that granite, silicide granite shows strongly negative Europium (Eu) anomaly whereas pyrite and quartz mineral of gold-bearing quartz vein in the deposit shows positive Eu anomalies. Also the study reveals that the deposit may be associated with deep magma.