DOI: 10.1016/j.palaeo.2016.02.018
论文题名: Warming or cooling in the Pragian? Sedimentary record and petrophysical logs across the Lochkovian-Pragian boundary in the Spanish Central Pyrenees
作者: Slavík L. ; Valenzuela-Ríos J.I. ; Hladil J. ; Chadimová L. ; Liao J.-C. ; Hušková A. ; Calvo H. ; Hrstka T.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 449 起始页码: 300
结束页码: 320
语种: 英语
英文关键词: Climate change
; Correlation
; Early Devonian
; Gamma-ray spectrometry
; Magnetic susceptibility
; Pyrenees
英文摘要: High-resolution petrophysical correlation methods were applied, for the first time, to mid-Paleozoic rocks of the Pyrenees. The methods included magnetic susceptibility measurements (MS), gamma-ray spectrometry (GRS), and alignment of MS logs using the dynamic time-warping (DTW) algorithm. Conodont biostratigraphy provided the basic framework necessary for work with the GRS and MS logs. Despite differences in the sediment patterns and accumulation/erosion rates, the logs from two selected sections in the Spanish Central Pyrenees show a striking symmetry that correlates well with the previously published logs from the Barrandian area in the Czech Republic. The high similarity between the petrophysical records from paleogeographically related but distant areas has the potential to contribute to the current discussions about the eustatic and climatic changes that took place in the overall greenhouse settings, where evidence for any polar ice sheets is still absent. In addition to the extant evidence of a major Lochkovian-Pragian offlap, combined with sea level lowering known from the North America, evidence about a major sea level fall and drastic reconstruction of the climatic system in the Pragian is now expanding over significant parts of the peri-Gondwanan belt. The data from Spain provide many new details about this change, including the phenomenon of a stratigraphically condensed upper Lochkovian, a dramatically different type of sedimentation in the Pragian, and a GRS-Th-and-MS anomalous stratigraphic interval in the middle Pragian. The multifaceted evidence allows us to determine the essential parts of the Pragian as a still "hot and humid" period, even with the strong differences from the possibly "extremely hot" Lochkovian. © 2016 Elsevier B.V.. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68501
Appears in Collections: 过去全球变化的重建
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作者单位: Institute of Geology of the CAS, v.v.i., Rozvojová 269, Prague 6, Czech Republic; Department of Geology, University of Valencia, C/Dr. Moliner 50, Burjassot, Spain
Recommended Citation:
Slavík L.,Valenzuela-Ríos J.I.,Hladil J.,et al. Warming or cooling in the Pragian? Sedimentary record and petrophysical logs across the Lochkovian-Pragian boundary in the Spanish Central Pyrenees[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,449