Migmatite-like textures in anthracite:Further evidence for low-grade metamorphic melting and resolidification in high-rank coals  

作　　者：James C.Hower Susan M.Rimmer Maria Mastalerz Nicola J.Wagner 

机构地区：[1]University of Kentucky Center for Applied Energy Research,2540 Research Park Drive,Lexington,KY 40511,USA [2]School of Earth Systems and Sustainability,Southern Illinois University Carbondale,Carbondale,IL 62901,USA [3]Indiana Geological&Water Survey,Indiana University,Bloomington,IN 47405,USA [4]Department of Geology,University of Johannesburg,Johannesburg,South Africa

出　　处：《Geoscience Frontiers》2021年第3期428-436,共9页地学前缘（英文版）

摘　　要：Previous studies demonstrated that melting,initiated by supercritical fluids in the 375-400℃range,occurred as part of anthracite metamorphism in the Appalachian Basin.Based on the known behavior of vitrinite at high temperatures and,to a lesser extent,at high pressures,it was determined that the duration of the heating,melting,and resolidification event was about 1 h.In the current study,featureless vitrinite within banded maceral assemblages demonstratesthe intimate association of melted and resolidified vitrinite with anthracite-rank macerals.By analogy with metamorphosed inorganic rocks,such associations represent diadysites and embrechites,i.e.,cross-cutting and layered migmatites,respectively.Even though the temperature of formation of the anthracite structures is several hundred℃lower than that seen in metamorphosed inorganic rocks,anthracites are metamorphic rocks and the nomenclature for metamorphic rocks may be appropriate for coal.

关 键 词：IGNEOUS Metamorphic texture PENNSYLVANIA Mesozoic basins South Africa 

分 类 号：P618.31[天文地球—矿床学]