DOI: 10.1007/s00531-013-0883-7
Scopus记录号: 2-s2.0-84878925722
论文题名: Cryogenic powderization of Triassic dolostones in the Buda Hills, Hungary
作者: Poros Z. ; Machel H.G. ; Mindszenty A. ; Molnár F.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2013
卷: 102, 期: 5 起始页码: 1513
结束页码: 1539
语种: 英语
英文关键词: Buda Hills
; Cryogenic powderization
; Dedolomitization
; Physical weathering
; Triassic dolostone
Scopus关键词: breccia
; chemical composition
; chemical weathering
; dolomite
; dolostone
; freeze-thaw cycle
; isotopic ratio
; particle size
; porosity
; saturation
; stable isotope
; trace element
; Triassic
; Buda Hills
; Hungary
; Pest
英文摘要: Disintegration of dolostones to dolomite powder (powderization) was a widespread phenomenon in Triassic dolostones of the Buda Hills, where the areal extent of powdered dolostones is large compared to similar occurrences elsewhere in the world. In the Buda Hills, dolostone disintegration proceeded in four stages that correspond to a gradual decrease in particle size, that is, from the parent dolostone to (1) crackle breccia; via (2) mosaic breccia (diameter <2 cm); via (3) mosaic breccia blocks 'floating' in dolomite powder; to (4) dolomite powder (diameter 100-300 μm). Stable isotope ratios and trace element compositions of dolomite remained constant throughout these stages, and there are no indications of dissolution in most locations, suggesting that disintegration was predominantly a mechanical process. Combining these findings with the geological history of the region, and supported by a simple freezing/thawing experiment and pertinent experimental studies on weathering of building stones, it appears that powderization in the Buda Hills was caused by repeated freeze-thaw cycles during and/or after the Pleistocene glaciations. Subaerial exposure under cold climate conditions involves multiple freeze-thaw cycles that create mechanical stresses in the rock framework related to the opposing thermal expansion of rock and water that freezes and of ice that liquefies. This process is herewith called 'cryogenic powderization'. Our data further suggest that the synergy of four factors promoted dolostone powderization in the Buda Hills: (1) tectonics, which created a pervasive fracture network; (2) intercrystalline porosity of the dolostone; (3) relatively high water saturation; and (4) subaerial exposure under cold climate conditions. © 2013 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84878925722&doi=10.1007%2fs00531-013-0883-7&partnerID=40&md5=a4fe4ed7ef9c4cce6b38029f381ec951
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70539
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Eötvös Loránd University, Pázmány P. s. 1/c, 1117 Budapest, Hungary; University of Alberta, Edmonton, AB, T6G 2E3, Canada; ConocoPhillips Company, 600 N Dairy Ashford, Houston, TX, 77079, United States; Geological Survey of Finland, Betonimiehenkuja 4, 02151 Espoo, Finland
Recommended Citation:
Poros Z.,Machel H.G.,Mindszenty A.,et al. Cryogenic powderization of Triassic dolostones in the Buda Hills, Hungary[J]. International Journal of Earth Sciences,2013-01-01,102(5)