Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (1): 85-96.doi: 10.13278/j.cnki.jjuese.20180217

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Geological Characteristics and Genetic Analysis of Xiengkhor Magnesite in Houaphanh Province, Laos

Zhang Zijun1, Ao Cong2, Yan Chengmin3, Yang Yu1, Lang Weixiong1, Hong Xinke1, Du Lei1, Li Xinren1   

  1. 1. No. 209 Geological Party, Geological Bureau of Yunnan Nuclear Industry, Kunming 650032, China;
    2. Tianjin Center, China Geological Survey, Tianjin 300170, China;
    3. Yunnan Bureau of Geology and Mineral Resources Regional Geological and Mineral Investigation Brigade, Yuxi 653100, Yunnan, China
  • Received:2018-08-20 Published:2020-02-11
  • Supported by:
    Supported by Yunnan High-Tech Industry Development Project(201704) and Overseas Commercial Geological Exploration Project(K20180512)

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Abstract: Through a field research,some new understandings have been obtained on the geology,ore body characteristics,surrounding rocks and rocks,ore characteristics, and mineral genesis of the Xiengkhor magnesite in Houaphanh Province,Laos. The exposed strata in the mining area are Lower Paleozoic (Pz1),Middle Carboniferous-Upper Carboniferous(C2-3),and Quaternary river secondary terrace deposits (QpⅡal). The main structure is a northwestward reverse fault and four northeast shift faults. The ore bodies are produced in the strong tectonic deformation zone on the southwest side of the reverse fault, and they are vein-like with the thickness of several millimeters,several centimeters, or ten centimeters. A total of ten ore bodies are circled. The surrounding rock of the ore body is the same as the rock type included in the ore body. It is a shallow metamorphic terrigenous clastic rock with high silicon(SiO2=81.190%),low magnesium(MgO=0.781%),and rich iron (Fe2O3=11.716%,FeO=1.719%). The ore mineral is magnesite,and the gangue minerals are mainly quartz,phlogopite,dolomite,sericite, and limonite. It is inferred that the Xiengkhor magnesite was formed during the closure of the Middle Triassic-Late Triassic Paleo-Tethys ocean:The magnesia precipitated from the ultramafic rocks and formed the ore-bearing hydrothermal fluid; after enrichment,reticular magnesite was formed in the strong tectonic deformation zone. The genetic type of the Xiengkhor magnesite belongs to the Laoxieng-type crystalline magnesite hydrothermal deposit in shallow metamorphic clastic rocks. The metallogenic age is in Middle Triassic-Late Triassic.

Key words: Xiengkhor magnesite, mining area geology, ore body characteristics, surrounding rock and stone, deposit genesis, hydrothermal deposit, Houaphanh Province,Laos

CLC Number: 

  • P611
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