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
E-mail: 554670042@qq.com
ACTA MINERALOGICA SINICA Vol. 37, No. 5, 2017, Page 528-535
