Ripple marks indicate Mid-Devonian paleo-wind directions in the Orcadian Basin (Orkney Isles, Scotland)

Vleeschouwer, David De; Leather, David; Claeys, Philippe

doi:10.1016/j.palaeo.2015.03.001

Cited by 7 publications

(3 citation statements)

References 15 publications

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“…Wind direction during the middle Devonian has been suggested to be largely southerly to south westerly from aeolian successions in Easter Ross and Orkney (Astin, ; Andrews, ) which is consistent with the position of this region within the south‐east trade wind belt; however, significant local and seasonal variations seem, likely, as suggested by the results presented by De Vleeschouwer et al . ().…”

Section: Shore Zone Architecture and Sedimentologysupporting

confidence: 68%

“…Therefore, the consistency of oscillation ripple orientation throughout all five developments of the shore zone facies suggests little change in the prevailing winds through this succession. Wind direction during the middle Devonian has been suggested to be largely southerly to south westerly from aeolian successions in Easter Ross and Orkney (Astin, 1985;Andrews, 2008) which is consistent with the position of this region within the south-east trade wind belt; however, significant local and seasonal variations seem, likely, as suggested by the results presented by De Vleeschouwer et al (2015).…”

Section: Amalgamated Elementsupporting

confidence: 62%

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Devonian lacustrine shore zone architecture: Giving perspective to cliff exposures with ground penetrating radar

2016

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Lake margin sedimentary systems have been the subject of only limited study. The cyclic Middle Devonian lacustrine succession of Northern Scotland contains repeated developments of shore zone sandstones and thus provides an ideal location for the study of these units. The cycles comprise deep lake, shallow lake, playa and shore zone facies. Detailed field This article is protected by copyright. All rights reserved.observations are presented alongside ground penetrating radar data which has aided largescale and three-dimensional characterisation of the shore zone sand bodies. Loading and discrete channel forms are recognised in thin-bedded sandstones within the lower portion of the lake shore zone successions. Up-section the sandstone beds appear to become amalgamated, forming subtle low angle accretionary bar complexes. Where imaged on the radar profiles, the repeated development of shoreward migrating features succeeded by more shallow angled lakeward accreting surfaces is recognised; these are ascribed to washover and swash-backwash processes, respectively. The orientation of these features is similar to palaeocurrent measurements from oscillation ripples, suggesting an alignment of the shore zone bars perpendicular to the prevailing wind direction. Further loaded sandstone beds and sand-filled shallow channel features overlie the bar forms. The context of the shore zone facies allows the controls on its formation to be examined. The shore zone sandstones overlie playa facies which contain abundant desiccation horizons, reflecting the most arid phase in the climatically controlled lacustrine cycle. As climatic conditions ameliorated the rejuvenation of fluvial systems resulted in the transport of sand out into the basin. Initial deposition was limited to intermittent events where sediment was laid down on a water saturated substrate. High resolution fluctuations in lake level resulted in periodic short-lived reworking events along the lake margins which produced amalgamated sands, forming low relief bars. Shore zone reworking is likely to have occurred over a wide area as the lake margin migrated back and forth, and gradually transgressed.

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Section: Shore Zone Architecture and Sedimentologysupporting

confidence: 68%

Section: Amalgamated Elementsupporting

confidence: 62%

Devonian lacustrine shore zone architecture: Giving perspective to cliff exposures with ground penetrating radar

2016

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“…The results from this study coupled with the recent results from Cai et al (2022) indicate relatively cold climatic conditions prevailed in both central and southern Mongolia during end late Permian times. De Vleeschouwer et al (2015) noted that few climate proxies provide information on paleowind directions. However, fossilized bedform elements such as wave-formed ripple marks can provide insight into the direction of flow that formed them.…”

Section: Depositional Settingmentioning

confidence: 99%

Petro-chemical characterization and depositional setting of a late Permian high ash coal deposit, Central Mongolia

Michaelsen,

Demberelsuren

2024

Mong. geosci.

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Pan global Permian coal measures are unique in the evolution of the Earth, not matched in any period before or since. Middle and late Permian coal-bearing strata are widely distributed in Mongolia. In particular, a large concentration of transtensive coal-bearing sub-basins is located in southern Mongolia, some of which are well documented. However, the late Permian coal measures developed along the shores of the Mongol-Transbaikalian Seaway in central Mongolia, the focus of this contribution, has received very limited attention. This study focuses on the c. 420 m thick coal-bearing middle part of a c. 2,600 m thick Permo-Triassic succession in the Bayanjargalan district. The study draws on data from 38 drillholes, 3 km of trenches, mapping, petrological analysis of sandstone samples, analysis of macroflora, fauna and trace fossils, 82 coal quality samples as well as washability and ash XRD analysis from a 3t coal bulk sample. The unstable and wedge-shaped architecture of the coal seams strongly suggest a syn-tectonic influence on their development. Paleoclimatic indicators suggest the peat mire ecosystem developed during relatively cold - temperate climatic conditions. Peat-forming plants such as Cordaites, Rufloria and Koretrophyllites probably benefited from moist air currents along the seaway. Plant-arthropod interactions are reported from two sites, in particular DT228 and DT246 oviposition lesions, the latter being almost twice the size of a previous report from North America. Results from 82 proximate analyses returned consistent very high ash yields of 46.95% (db) and 43.45% (adb) from the 3t bulk sample, which are unusual for Permian coals in Mongolia.

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Late Triassic paleowinds from lacustrine wave ripple marks in the Fleming Fjord Group, central East Greenland

Mau

Bjerrum

Clemmensen

2022

Palaeogeography, Palaeoclimatology, Palaeoecology

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Ripple marks indicate Mid-Devonian paleo-wind directions in the Orcadian Basin (Orkney Isles, Scotland)

Cited by 7 publications

References 15 publications

Devonian lacustrine shore zone architecture: Giving perspective to cliff exposures with ground penetrating radar

Devonian lacustrine shore zone architecture: Giving perspective to cliff exposures with ground penetrating radar

Petro-chemical characterization and depositional setting of a late Permian high ash coal deposit, Central Mongolia

Late Triassic paleowinds from lacustrine wave ripple marks in the Fleming Fjord Group, central East Greenland

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