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隶属于西秦岭南亚带的拉尔玛金矿床赋存于寒武系太阳顶群中，太阳顶群主要有硅质岩和碳质板岩两类岩石。金与有机碳的关系、矿（岩）石的浸出率与有机碳含量的负相关、微量元素和稀土元素Ｑ型聚类分析及有机质、粘土矿物吸附和释放金的现代模拟实验表明：太阳顶群热水成因的硅质岩构成了拉尔玛金矿床主要的矿源层。太阳顶群硅质岩的有机地球化学研究表明，与金关系密切的有机质的生物先质体为海生低等菌藻类生物。硅质岩中金含量与菌藻生物化石量的正相关关系又进一步说明了拉尔玛金矿床矿源层形成过程中，这些海生菌藻生物起了重要的作用。现代菌藻生物成矿的实验研究表明：（１）菌藻生物对金有明显的富集作用，但不同的生物对金的富集作用强弱不同，蓝细菌较绿藻对金的富集作用强烈，热水环境生物较常温条件下的生物对金的富集作用强烈；（２）蓝细菌生物较粘土矿物、沉积物和生物降解的有机质对金的富集作用强；（３）生物富集的金易于释放活化
The Lalma gold deposit, which is subordinated to the western subtropical zone of western Qinling, is hosted in the Cambrian solar top group. There are mainly two types of rocks, the chert group and the slate rock. The relationship between gold and organic carbon, the negative correlation between leaching rate of ore rock and organic carbon content, Q type cluster analysis of trace elements and rare earth elements and the modern simulation experiments of adsorption and release of gold by organic matter and clay minerals show that: The cherts of the group hydrothermal origin form the main source layer of the Larma gold deposit. Organic geochemical studies of the chevron in the Yangdingqu Formation show that the organism precursors closely related to gold are marine hygrophyte algal organisms. The positive correlation between the gold content in chert and the biomass of fossil algae further explains that these marine algae algae play an important role in the formation of the source layer of the Lalma gold deposit. The experimental research on the bio-mineralization of modern bacteria and algae showed that: (1) the bacteria and algae had a significant enrichment effect on gold, but the enrichment of gold by different organisms was different. (2) Cyanobacteria have stronger enrichment effect on gold than clay minerals, sediments and biodegradable organic matter; (3) Creatures Enriched gold is easily released and activated