WALL-ROCK ALTERATIONS AND ASSOCIATED HYDROTHERMAL QUARTZ TEXTURES IN ANTIMONY DEPOSITS OF THABYU AREA, KYA-IN-SEIKKYI TOWNSHIP, KAYIN STATE
Abstract
- The research area is located in the southernmost part of Kayin State, near Myanmar-Thai border, Kya-in-seikkyi Township. In the research area, antimony mineralization is observed in the fracture zones which are NNW-SSE trending in the metasedimentary rock units of Taungnyo Formation. The common types of hydrothermal wall-rock alterations of ore deposits in the research area are silicification, vuggy silica (vuggy quartz) alteration, argillic alteration, prophylitic alteration, and pyritization/sulphidation. Quartz (chalcedony and vuggy), calcite, pyrite, hematite, barite and sericite are the alteration products. Hydrothermal alteration around the mineral deposits commonly forms alteration halos. Classification of quartz textures observed in the mineralized vines and wall-rocks of the research area are –primary growth texture, recrystallization texture, and replacement texture. . Primary growth textures of vein quartz are (1) Chalcedonic texture, (2) Comb texture and (3) Crustiform texture. Recrystallization texture of quartz in the mineralized veins can be classified into moss texture. Replacement textures represent partial or complete pseudomorphs of other minerals by silica minerals within veins. The samples from the mineralized vein are show bladed texture under microscope. The consistent pattern of distribution of textures and consistent assemblages of textures can be used to define a vertical textural zoning model. Thus model should be capable of determining vertical position within a boiling epithermal vein system and predicting the locus of mineralization. The mineralogy and some chemical composition of alterations and hydrothermal quartz textures of antimony mineralization of research area provide an indication of proximity of mineralization and provide information on reservoir and fluid characteristics.
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Year
- 2020
Author
-
Than Htoo Aung
Subject
- Geology
Publisher
- Myanmar Academy of Arts and Science (MAAS)