DOI: 10.1007/s00531-012-0811-2
Scopus记录号: 2-s2.0-84874020771
论文题名: Timing, styles, and kinematics of Cambro-Ordovician extension in the Teplá-Barrandian Unit, Bohemian Massif, and its bearing on the opening of the Rheic Ocean
作者: Žák J. ; Kraft P. ; Hajná J.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2013
卷: 102, 期: 2 起始页码: 415
结束页码: 433
语种: 英语
英文关键词: Anisotropy of magnetic susceptibility (AMS)
; Bohemian Massif
; Extension
; Rheic Ocean
; Rifting
; Teplá-Barrandian Unit
Scopus关键词: Cambrian
; kinematics
; lithofacies
; magnetic anisotropy
; Ordovician
; rifting
; sedimentary sequence
; subduction
; Bohemian Massif
; Indicator minor
英文摘要: This paper describes late Cambrian dikes and Early Ordovician volcano-sedimentary successions of the Prague Basin, Bohemian Massif, to discuss the timing and kinematics of breakup of the northern margin of Gondwana. Andesitic dikes indicate minor E-W crustal extension in the late Cambrian, whereas the Tremadocian to Dapingian lithofacies distribution and linear array of depocenters suggest opening of this Rheic Ocean rift-related basin during NW-SE pure shear-dominated extension. This kinematic change was associated with the onset of basic submarine volcanism, presumably resulting from decompression mantle melting as the amount of extension increased. We conclude from these inferences and from a comparison with other Avalonian-Cadomian terranes that the rifting along the northern Gondwana margin was a two-stage process involving one major pulse of terrane detachment in the early Cambrian and one in the Early Ordovician. While the geodynamic cause for the former phase remains unclear, but still may include effects of Cadomian subduction (roll-back, slab break-off), isostatic rebound, or mantle plume, the incipient stage of the latter phase may have been triggered by the onset of subduction of the Iapetus Ocean at around 510 Ma, followed by advanced extension broadly coeval (Tremadocian to Darriwilian) in large portions of the Avalonian-Cadomian belt. Unequal amounts of extension resulted in the separation and drift of some terranes, while other portions of the belt remained adjacent to Gondwana. © 2012 Springer-Verlag. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84874020771&doi=10.1007%2fs00531-012-0811-2&partnerID=40&md5=4c2a11e66c570e7cdd0aec771bee82b6
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70578
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: Institute of Geology and Paleontology, Faculty of Science, Charles University, Albertov 6, 12843 Prague, Czech Republic
Recommended Citation:
Žák J.,Kraft P.,Hajná J.. Timing, styles, and kinematics of Cambro-Ordovician extension in the Teplá-Barrandian Unit, Bohemian Massif, and its bearing on the opening of the Rheic Ocean[J]. International Journal of Earth Sciences,2013-01-01,102(2)