Abstract Cerro Moro deposit is a low sulfidation Au–Ag epithermal deposit located in Santa Cruz province, southern Patagonia Argentina. It is hosted by numerous structurally controlled quartz veins developed in close spatial and temporal relationship with the Jurassic extension and magmatism. The main area in Cerro Moro comprises the Escondida horst block, limited by NW-SE listric faults which provided the channels for the hydrothermal system. The Escondida (including its high grade ore shoot Zoe), Gabriela and Margarita prospects are representative areas documenting the dynamics of the major fault systems. Four stages of mineralization were defined in Cerro Moro. Gabriela and Margarita prospects, at the center and NE of the deposit, respectively, show good development of bladed quartz replacement textures with adularia crystals and scarce translucent/opaque minerals from the stage 1 (pyrite-sphalerite > chalcopyrite ≫ galena-gold). The Escondida prospect, representing the southwest boundary of the Escondida horst block, is the most significantly mineralized structure hosting the base metal-rich and high grade Au–Ag mineralization. In this vein and in the Zoe high grade ore shoot, the translucent/opaque minerals are abundant (sphalerite, galena, chalcopyrite, lesser pyrite, marcasite, gold, silver and different quantities of Ag-bearing minerals) and mainly related to the dark grey, finely-grained quartz-muscovite veins from the stage 3 and to a lesser degree, from the stage 2. The presence of porous massive, crustiform, moss and colloform textures are interpreted to be formed by a sudden pressure release, where hydrofracturing and repetitive boiling occurred and lead to mineral deposition. Whitish quartz-adularia veinlets from the stage 4 may crosscut the previous sequences. The transparent, translucent and opaque minerals in Cerro Moro express a typical low sulfidation system, where the vein system is the result of the infilling and deposition of low temperature (174–265 °C) and salinity (0.4–0.7 wt% NaCl(eq)) hydrothermal fluids.

中文翻译：

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Escondida、Gabriela 和 Margarita 矿化结构的矿物学和显微测温，来自阿根廷 Deseado 地块的 Cerro Moro 低温热液矿床

摘要 Cerro Moro 矿床是位于阿根廷巴塔哥尼亚南部圣克鲁斯省的低硫化金银低温热液矿床。它由与侏罗纪伸展和岩浆活动密切时空关系的众多结构控制的石英脉所承载。Cerro Moro 的主要区域包括 Escondida 地垒块，受 NW-SE 列断层限制，为热液系统提供通道。Escondida（包括其高品位矿区 Zoe）、Gabriela 和 Margarita 前景是记录主要断层系统动态的代表性区域。Cerro Moro 定义了四个矿化阶段。Gabriela 和 Margarita 勘探区分别位于矿床的中心和东北部，显示了叶片石英替代纹理的良好发展，其中包含来自第 1 阶段的 adularia 晶体和稀有的半透明/不透明矿物（黄铁矿-闪锌矿 > 黄铜矿≫ 方铅矿-金）。Escondida 勘探区代表 Escondida 地块的西南边界，是最显着的矿化结构，拥有富含贱金属和高品位的 Au-Ag 矿化。在这条矿脉和 Zoe 高品位矿芽中，半透明/不透明矿物丰富（闪锌矿、方铅矿、黄铜矿、小黄铁矿、白铁矿、金、银和不同数量的含银矿物），主要与深灰色有关, 来自第 3 阶段的细粒石英白云母脉，来自第 2 阶段的程度较小。 存在多孔块状，壳状，苔藓和胶体纹理被解释为由突然的压力释放形成，其中发生水力压裂和重复沸腾并导致矿物沉积。来自第 4 阶段的白色石英-adularia 细脉可能横切先前的层序。Cerro Moro 的透明、半透明和不透明矿物表现出典型的低硫化系统，其中脉系统是低温（174-265°C）和盐度（0.4-0.7 wt% NaCl（eq )) 热液流体。