DOI: 10.1016/j.gloplacha.2016.11.016
论文题名: Western Tethys continental-marine responses to the Carnian Humid Episode: Palaeoclimatic and palaeogeographic implications
作者: López-Gómez J. ; Escudero-Mozo M.J. ; Martín-Chivelet J. ; Arche A. ; Lago M. ; Galé C.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2017
卷: 148 起始页码: 79
结束页码: 95
语种: 英语
英文关键词: Carnian Humid Episode
; CHE
; CPE
; Julian
; Keuper
; Late Triassic
; Western Tethys
Scopus关键词: Deposits
; Sea level
; Tectonics
; Carnian Humid Episode
; Julian
; Keuper
; Late Triassic
; Western Tethys
; Sedimentology
英文摘要: This case-study examines correlations in the continental-marine sedimentary record for the Late Triassic Carnian Humid Episode in the western Tethys domain of present-day E Spain and islands of Majorca and Minorca. The study area was divided into five sectors from west to east. Sectors 1 to 3 comprise the continental sedimentary record of this humid episode in eastern Iberia, which is represented by the three subunits (K-2.1, K-2.2 and K-2.3) of the K-2 Fm or Manuel Fm; each subunit records a fluvial episode with marine intercalations in distal areas. Sector 4 corresponds to Majorca Island and represents volcaniclastic input into a marginal continental-marine transitional environment. Finally, sector 5 on Minorca Island comprises a karst surface developed on middle ramp deposits of the Arenal d'en Castell Fm, and separating this formation from the overlying Fontanelles Fm. Based on the ages of the units, estimated through palynomorph assemblages and ammonites, the Carnian Humid Episode was located in both the continental and marine sedimentary records. A detailed sedimentary study focused on facies analysis identified allogenic controls on both continental and marine records. Hence, in continental areas influenced by sea-level fluctuations, fluvial deposits appear integrated within standard lowstand, transgressive and highstand system tracts. This connection based on sedimentary sequences and unit ages indicates that subunits K-2.1 and K-2.2 are represented by a karst surface on the subaerially exposed shallow marine deposits, while subunit K-2.3 already reflects a return to the normal Late Triassic semi-arid to arid conditions that laterally correspond to the transgressive stage represented by the Fontanelles Fm in sector 5. Late Triassic tectonics activated previously developed N·NE-S·SW and NW-SE conjugate fault lineaments in eastern Iberia. This rifting episode controlled sedimentation in sectors 1 to 3, allowing volcanic activity at the fault lineaments junction in sector 4, and configuring a palaeogeography of elevated and subsiding blocks, which controlled both continental and marine sedimentation in the study area. © 2016 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85004024993&doi=10.1016%2fj.gloplacha.2016.11.016&partnerID=40&md5=8cb08f41d8083c51373eb4b9205b5985
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11789
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: Instituto de Geociencias (UCM, CSIC), c/José Antonio Nováis 2, Madrid, Spain
Recommended Citation:
López-Gómez J.,Escudero-Mozo M.J.,Martín-Chivelet J.,et al. Western Tethys continental-marine responses to the Carnian Humid Episode: Palaeoclimatic and palaeogeographic implications[J]. Global and Planetary Change,2017-01-01,148.