Paleostress from healed microcracks and fluid inclusions in granites of the Ogcheon folded belt, South Korea  

作　　者：Seong-Seung Kang Bo-An Jang Taeyoo Na Jeongdu Noh 

机构地区：[1]Department of Energy and Resources Engineering,Chosun University,Gwangju 61452,Korea [2]Department of Geophysics,Kangwon National University,Chuncheon 24341,Korea [3]Geology and Space Division,Korea Institute of Geoscience and Mineral Resources,Daejeon 34132,Korea [4]Jeollanamdo Carbon Neutral Center,Jeonnam Research Institute,Naju 58217,Korea

出　　处：《Episodes》2024年第3期625-640,共16页地质幕(英文版)

摘　　要：In the northeastern and southwestern areas of the Ogcheon folded belt where Mesozoic granites are distributed,healed microcracks and fluid inclusions in the granite bodies were measured to elucidate the paleostress field that acted on these areas.The predominant orientations of healed microcracks in the northeastern and southwestern areas of the Ogcheon folded belt are the N50°W for the Inje granite,N30°W for the Jecheon granite,N55°W for the Wolaksan granite,N5°W for the Sokrisan granite,N30°W for the Daebo granite,and N70°W for the foliated granite.The homogenization and trapping temperatures of fluid inclusions in the Jecheon granite are 170–290°C and 260–390°C,respectively,and the formation period of healed microcracks is estimated to be 209–149 Ma.In the Inje granite,the homogenization and trapping temperatures of fluid inclusions are 165–290°C and 250–400°C,respectively,and the formation period of healed microcracks is estimated to be 176–160 Ma.In the Wolaksan granite,the homogenization and trapping temperatures of fluid inclusions are 165–375°C and 230–570°C,respectively,and the formation period of healed microcracks is estimated to be 116–88 Ma.In the Sokrisan granite,the homogenization and trapping temperatures of fluid inclusions are 155–280°C and 210–410°C,respectively,and the formation period of healed microcracks is estimated to be 92–84 Ma.In the foliated granite,the homogenization and trapping temperatures of fluid inclusions are 150–310°C and 380–550°C,respectively,and the formation period of healed microcracks is estimated to be 120–166 Ma.In the Daebo granite,the homogenization and trapping temperatures of fluid inclusions are 150–320°C and 380–440°C,respectively,and the formation period of healed microcracks is estimated to be 183–166 Ma.Consequently,during the Mesozoic,the predominant maximum horizontal stress direction in the Korean Peninsula was NW-SE,with secondary influences from N-S and E-W directions.Moreover,the direction of these m

关 键 词：paleostress field ogcheon folded belt wolaksan graniten w sokrisan graniten w healed microcracks mesozoic granites PALEOSTRESS fluid inclusions 

分 类 号：P588.1[天文地球—岩石学] P542[天文地球—地质学]