Abstract
Material characteristics of placer gold and geological and geomorphological features of placercontaining watercourses allow revealing the type of source that formed the placer. The studied area (the middle reach of theAdychaRiver, Verkhoyansk District, Yakutia) is characterized by highly developed placer gold mineralization both in ancient terrace sediments and high-order watercourses. The significant placer gold mineralization in the high-order watercourses, at very limited number of known bedrock gold deposits suggests the presence of not yet discovered bedrock gold mineralization. Revealing the type of sources of placer gold in young high-order watercourses allows to create prognostic and prospecting models for both potential placer and primary (vein) ore occurrences. The purpose of the study is to compile a logical-information algorithm, which, based on the most significant material and geological-geomorphological factors, will enable revealing the type of placer gold source and the possibility of its location discovery and probability of gold transportation continuation from the source. The study result is presented by a program (the Python programming language) that characterizes the type of placer gold source based on gold grain rounding degree, the presence of gold intergrowths with other minerals and the presence of heavy fraction. Assessment of the possibility of placer gold source location determination is based on geological and geomorphological factors: watercourse order, the type of placer, and spatial association with terraces of ancient erosion levels. The study of well-known gold placers using the created program allowed revealing gold placers with supposedly primary gold source and other ones with the source in the form of a natural intermediate gold concentrator. A map of exogenous gold mineralization with forecast elements was also created, presenting areas promising for revealing primary gold mineralization (areas of presence of high-order watercourses with gold mineralization source) and areas of high-order watercourses promising for discovering gold placers (identified by analogy (in geological and geomorphological position) with watercourses with the known source in the form of natural intermediate gold concentrator.
Highlights
geomorphological features of placer-containing watercourses allow revealing the type of source that formed the placer
The study result is presented by a program
that characterizes the type of placer gold source based on gold grain rounding degree
Summary
Аннотация: Вещественные характеристики золота россыпных объектов и геолого-геоморфологические особенности россыпесодержащих водотоков позволяют судить о типе источника, сформировавшего россыпь. Определение типа источников россыпей молодых водотоков (I и II порядков) позволяет строить прогнозно-поисковые модели как для потенциально россыпных, так и для рудных объектов. Цель исследования заключается в составлении логико-информационного алгоритма, который на основе наиболее значимых вещественных и геолого-геоморфологических факторов позволит не только определить тип источника россыпи, но и вероятность его локализации и продолжающегося сноса металла. При исследовании известных россыпных объектов на созданной программе выявлены россыпи с предположительно коренным источником и источником в виде промежуточного коллектора. Также составлена карта экзогенной золотоносности с элементами прогноза: площадями, перспективными на выявление коренных скоплений золота (области распространения водотоков низких порядков с рудным источником) и водотоками низких порядков, перспективными для выявления россыпных объектов (выделены по принципу аналогии по геолого-геоморфологической позиции с известными водотоками с источником в виде промежуточного коллектора).
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