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近20年来,在我国贵州西南地区陆续发现了一系列产于沉积岩中的微细浸染型金矿床,从而引起了国际地质学界的广泛关注,并被认为是中国最具潜在远景的金矿产地之一,鉴于这些金矿床受层位和岩性控制十分明显,以至迄今对其所表现出来的层控性质为众所公认.又鉴于金的矿化主要以微细浸染状产出,因而一些研究者将其与卡林型金矿床相类比.目前对此类矿床成因的倾向性看法是,在同生沉积初步富集金的基础上经后期改造再富集成矿,强调后生热液改造占主导地位.然而,作者对黔西南十余个金矿床研究后发现,矿床中不乏海底喷流同生沉积特征,尤其是戈塘、板其和岩上等金矿床中存在典型含矿层状硅质岩,为评价海底喷流沉积作用及其对金矿床形成的控制提供了极为重要的证据. 确认海底喷流产物的主要证据有:(1)在晚古生代和中生代早期,矿床所在区域──右江盆地中存在多组穿壳的同生断裂,这为热液活动提供了通道.沿同生断裂的扩张活动,导致盆地中发育了一系列的隆起和洼地.(2)矿
In recent 20 years, a series of fine disseminated gold deposits produced in sedimentary rocks have been discovered in the southwestern Guizhou Province, which has aroused widespread concern in the international geology community and is considered as one of the gold deposits with the most potential prospect in China , Given that these gold deposits are well dominated by horizon and lithology and so far the stratigraphic control properties so far demonstrated have been well recognized and since gold mineralization is mainly produced in finely disseminated forms, It is analogous to the Carlin-type gold deposit, and the current tendency of the genesis of this type of deposit is that after the initial enrichment gold from the syngenetic deposits, it is reformed and enriched later by mineralization, emphasizing that the conversion of the meta-hydrothermal fluids dominates. However, after studying more than ten gold deposits in southwestern Guizhou Province, the authors found that there are many sedimentary facies characteristics of seafloor jets in the deposit, especially the typical ore-bearing stratiform chert in the gold deposits such as Getang, Banqi, and Shangshang Evaluation of submarine jet deposition and its control over the formation of gold deposits provide extremely important evidence.The main evidence to confirm the products of submarine jets are: (1) In the late Paleozoic and Early Mesozoic, the deposit area - Youjiang basin through a plurality of sets of shell growth faults, which provides a passageway for the hydrothermal activity. Contemporaneous faults along the expansion activity, leading to the development of a series of basins ridges and depressions (2) Ore