Central Asia––A Global Model for the Formation of Epigenetic Deposits in a Platform Sedimentary Cover

• 作者: Igor Pechenkin Vladislav Petrov
• 来源期刊: 地球科学学刊（英文版）
• 年，卷（期）: 2022,（2）
• 所属期刊栏目: Special Issue on Sandstone-Type Uranium Mineralization and Its Metallogenic Background
• 页码范围: 278-288
• 页数: 11页
• 语种: 英文

摘要

Metallogenic specialization of sedimentary cover in Central Asia is determined by its tec-tonic setting that governs the hydrodynamic regime (exfiltrational or infiltrational) and as a consequence, the hydrogeochemical zonality (type of water and its gaseous and microcomponent composition). Hydro-dynamic conditions (distribution of recharge and discharge areas) determine the direction of stratal wa-ter flow and location of mineralization resulted from the change in geochemical, thermodynamic, litholog-ical, structural and other conditions. The exfiltrational regime suggests a dependence of the epigenetic mineralization upon the distribution and degree of preservation of hydrocarbon occurrences. Often, hy-drocarbon matter serves as a reducing barrier and ore-concentrating factor during the formation of polymineral concentrations related to stratal oxidation zone. The supergene epigenetic ore-forming pro-cesses are induced by the interaction between the Earth ' s sedimentary cover and hydrosphere. Sedimen-tary rocks themselves commonly serve as a source of ore materials. The ore deposition zones on geochemi-cal barriers and ore material source are often located significantly apart from each other. The trend of these processes is determined by the position of ore-bearing depressions in large tectonic blocks.