Ancient Coal Fires on the Southwestern Periphery of the Kuznetsk Basin, West Siberia, Russia: Geology and Geochronology


статья в сборнике
Авторы: Novikova S.A.   (ИГМ СО РАН)   Sokol E.V.   (ИГМ СО РАН)   Novikov I.S.   (ИГМ СО РАН)   Travin A.V.   (ИГМ СО РАН)  
дата публикации: 2014
реферат:
Late Cenozoic combustion metamorphic (CM) complexes produced by natural coal fires are widespread in Central Asia. In situ coal seams cannot burn for the lack of oxygen, but combustion can arise as they become exposed to the aeration zone. Coal beds can be raised to the surface during tectonic uplift of the sediments and following erosion. Once being exposed to aeration, coal absorbs oxygen and either inflames or rapidly looses the ignition ability by oxygen deactivation (Kukharenko, 1960; Stracher et al., 2010). Therefore, large-scale coal fires may have been a prompt response to tectonic activity and erosion during Late Cenozoic time. In the Kuznetsk basin, the coaliferous sediments have experienced CM, which left signature in abundant CM rocks. The studied CM-complexes are located on the west (Salair) and southwest (Kondoma) deformed Kuznetsk basin periphery. In kuznetsk CM-complexes, melted metasedimentary rocks (paralavas and clinkers) were found. Melted CM rocks have a phase composition favorable for 40Ar/39Ar dating of coal ignition and triggered it Late Cenozoic geological events. Two groups of 40Ar/39Ar-ages have been obtained. The older ages (∼1.1ŷ0.2 Ma) represent rocks in the western edge of the Salair zone. These ages record the time when the uplift of the Prokopievsk-Kiselevsk block began as result of rejuvenation of pre-Cenozoic faults
первоисточник: Coal and Peat Fires: A Global Perspective. Vol. 3: Case Studies - Coal Fires
том:
страницы: 510-541
ISBN: System.Object[]
ISSN:
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