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Mineralogical-Petrological Characteristics of Tectonites from Dayao Liuju Copper Ore-District, Central Yunnan Province, China and Their Geological Significance (Vol. 37, No. 5, 2017) TEXT SIZE: A A A

ZOU Hai-jun1,2, HAN Run-sheng2*, FANG Wei-xuan3, HU Rui-zhong1, Liu Meng-qiong4

(1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Science, Guiyang 550002, China;
2. Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China;
3. Geological Survey Center for Non-ferrous Mineral Resources, Beijing 100012, China; 4. Architecture & Engineering Design Institute of Yunnan Province, Kunming 650021, China)

Abstract: As a typical sandstone-type copper ore district in the Chuxiong Basin, Dayao Liuju copper ore-deposits and ore-bodies formed with tectonic-metallogenic mineralization during the Himalayan movement on the basis of sedimentation-diagenesis mineralizing at the Yanshan movement stage, which leads to show structure-controlling features. Based on the geological and ore-forming characteristics and structural deformation analysis results of macro-structures including folds and faults in Liuju copper ore-district, Dayao, it is emphasized to use ways by microstructures and ESR dating to reveal the mineralogical-petrological characteristics and geological significance of the tectonites. We also discussed how to expand the study on tectonite petrology in the future. Oriented tectonites’ micro-structural marks indicate that there exist principal compressive stresses as the NE-SW, E-W, NW-SE and S-N trends; the ore bearing fluid should be driven under the tectonic stresses to deposit ores and form silicification and carbonation alteration when the purple sandstones were altered into light-colored. The tectonite ESR dating results reflect that the district was experienced 3 stages of structural deformation and thermal-fluid activities respectively due to the early stage (46.8±4.5~56.0±5.6 Ma), medium stage (32.4±3.0~42.3±4.1 Ma) and late stage (23.5±2.4~29.3±3.0 Ma) of the Himalayan movement. The ESR dating could be an effective chronological method to study the regional structure evolution. And the mineralogy- petrology research should be complement and certification items for matching the study on macro-structure deformation.

Keywords: tectonite; mineralogy-petrology research; micro-structure; ESR dating; Dayao Liuju copper ore-district

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ACTA MINERALOGICA SINICA Vol. 37, No. 5, 2017, Page 528-535

 

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