DOI: 10.1007/s00531-015-1169-z
Scopus记录号: 2-s2.0-84942369386
论文题名: Thermal history of the Sabero Coalfield (Southern Cantabrian Zone, NW Spain) as revealed by apatite fission track analyses from tonstein horizons: implications for timing of coalification
作者: Botor D. ; Anczkiewicz A.A.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2015
卷: 104, 期: 7 起始页码: 1779
结束页码: 1793
语种: 英语
英文关键词: Apatite fission track analyses
; Cantabrian Zone
; Pull-apart basin
; Sabero Coalfield
; Thermal history
; Vitrinite reflectance
Scopus关键词: annealing
; apatite
; Carboniferous
; coal seam
; fission track dating
; paleotemperature
; pull apart basin
; vitrinite reflectance
; Cantabrian Mountains
; Spain
; Calluna vulgaris
英文摘要: Apatite fission track (AFT) central ages from Carboniferous (Stephanian) tonsteins of the Sabero Coalfield, NW Spain, range from 140.8 ± 7.5 to 65.8 ± 8.1 Ma (Cretaceous), with mean c-axis projected track length values ranging from 12.5 to 13.4 μm. Mean random vitrinite reflectance (Rr) of these samples ranges from 0.91 to 1.20 %, which can be translated into maximum palaeotemperatures of ca. 130 to 180 °C. All analysed samples experienced substantial post-depositional annealing. The considerably younger AFT ages compared to the depositional ages of the samples and Rr data indicate the certainty of the occurrence of at least one heating event after the deposition of strata. The unimodal track length distributions, the relatively short mean track length, and the rather low standard deviation (SD) (1.0–1.6 μm) indicate a relatively simple thermal history that could be related to the post-Late Variscan heating event followed by prolonged residence in the apatite partial annealing zone (APAZ). Geological data combined with thermal models of AFT data indicate that Stephanian strata reached the maximum palaeotemperatures in the Permian period, which was therefore the major time of the coalification processes. The Permian magmatic activity was responsible for a high heat flow, which, with the added effect of sedimentary burial, could account for the resetting of the AFT system. It appears that the fault-related hydrothermal activity could have redistributed heat in areas of significant subsidence. Cooling occurred in the Triassic–Cretaceous times after a high heat flow Permian regime. A post-Permian maturation of the Stephanian organic matter is not very likely, since there is no evidence of a high Mesozoic burial that was sufficient to cause a significant increase in the palaeotemperatures. Finally, exhumation and associated erosion rates may possibly have been faster in the Tertiary, causing the present exposure of the studied rocks. © 2015, The Author(s). URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84942369386&doi=10.1007%2fs00531-015-1169-z&partnerID=40&md5=d1e2a792b485cfd9c8bf1429391376b0
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70245
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: AGH University of Science and Technology, al. Mickiewicza 30, Kraków, Poland; Institute of Geological Sciences PAS, Senacka 1, Kraków, Poland
Recommended Citation:
Botor D.,Anczkiewicz A.A.. Thermal history of the Sabero Coalfield (Southern Cantabrian Zone, NW Spain) as revealed by apatite fission track analyses from tonstein horizons: implications for timing of coalification[J]. International Journal of Earth Sciences,2015-01-01,104(7)