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Eventual solution to the problems of gold ore trends localization in the Carlin province (Nevada, USA)
International Journal of Earth Sciences ( IF 1.8 ) Pub Date : 2021-05-30 , DOI: 10.1007/s00531-021-02056-2
Vadim G. Khomich , Natalia G. Boriskina

Multi-year research on Carlin-type noble-metal mineralization has allowed the determination of deposit distribution trends, as well as the identification of several stratigraphic, geological-structural, and physicochemical conditions for the formation of the deposits. However, empirical conclusions do not fully encompass the results of modern geophysical and seismotomographic investigations. The involvement of the latter in the determination of the formation and distribution characteristics of known trends enables us to acknowledge that the Carlin world-class gold-ore province (Nevada, USA) is situated in the rear zone of the marginal-continental volcanic-plutonic belt with late Mesozoic–Cenozoic magmatism manifestations and linear belts of endogenous deposits of different formational and mineral types, which are diffusely scattered across the area of accretionary orogens. The formation of late Mesozoic–Cenozoic ore-magmatic systems in the province is predetermined by retinues of underslab and overslab asthenospheres that have been positioned as two layers beneath the continental lithosphere. The lower asthenosphere located in the mantle transition zone under the subducted Farallon plate contacted the higher asthenosphere by the upwelling of toroidal and poloidal fluid-energetic flows. Known trends of Carlin-type Au deposits were controlled by two permeable structures of deep-level geodynamics: the sublatitudinal structure of the Mendocino transform-type fault zone (Getchell and Jerritt Canyon trends), which bounds the Farallon plate in the north, and the paleo-spreading center of the East Pacific Rise of a NNW strike (Battle Mountain Eureka, Carlin, and Alligator Ridge trends).



中文翻译:

卡林省(美国内华达州)金矿趋势定位问题的最终解决方案

对卡林型贵金属矿化的多年研究已经确定了矿床的分布趋势,并确定了形成矿床的几种地层,地质结构和物理化学条件。但是,经验结论并未完全涵盖现代地球物理和地震照相调查的结果。后者参与确定已知趋势的形成和分布特征使我们能够承认卡林世界级金矿省(美国内华达州)位于边缘大陆火山-深成岩的后部区域。具有晚中新生代岩浆活动表现的带和不同地层和矿物类型的内源沉积物的线状带,散布在增生造山带区域。该省晚中新生代矿-岩浆系统的形成是由位于大陆岩石圈下方两层的板下和板上软流圈的附属物预先确定的。位于俯冲法拉隆板块下方地幔过渡带的低软流圈通过环形和极向流体能流的上升流与高软流圈接触。卡林型金矿床的已知趋势受深层地球动力学的两个可渗透结构控制:门多西诺变换型断层带的次纬向结构(格彻尔和耶里特峡谷趋势),其北部界定了法拉隆板块的边界, NNW 罢工的东太平洋隆起的古传播中心(Battle Mountain Eureka,

更新日期:2021-05-30
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