Identifying fluvio–lacustrine intervals in thick playa-lake successions: An integrated sedimentology and ichnology of arenaceous members in the mid–late Triassic Mercia Mudstone Group of south-west England, UK

Porter, Robert; Gallois, R.W.

doi:10.1016/j.palaeo.2008.07.020

Cited by 33 publications

(36 citation statements)

References 14 publications

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“…Wave ripple lamination and antidune features are common. Subsurface examples of these in the Central North Sea have been described by McKie and Audretsch (2005) and McKie et al (in press), Olsen (1987) and isolated examples embedded in the Mercia Mudstone by Porter and Gallois (2008). The laminated shales associated with these cycles record subaqueous deposition, although the common desiccation features suggest ephemeral water bodies.…”

Section: Dryland Terminal Splay Complexesmentioning

confidence: 92%

“…Schilfsandstein; Aigner and Bachmann 1992;Koppen and Carter 2000). In the Wessex Basin Carnian stranded lacustrine shoreline deposits occur embedded in the Mercia Mudstone (Porter and Gallois 2008), recording the former presence of lacustrine water bodies. The progradation of the Chaunoy fluvial fan deposits off the remnant LondonBrabant Massif (cf.…”

Section: Upper Triassicmentioning

confidence: 99%

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Triassic palaeogeography and fluvial dispersal across the northwest European Basins

2009

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Triassic dryland fluvial systems occur infilling extensional and post-rift basins across northwest Europe. These systems were deposited by streams draining off the major basin margin catchments of Greenland, Fennoscandia, the Scottish Highlands and the remnant Variscan mountains. Fluvial drainage was dominantly endorheic in character, and terminated in playa, aeolian dune, sabkha or marsh settings. Whilst the ambient basin climate fluctuated through varying levels of aridity and humidity, the dispersal of sand into these basins was critically dependant on catchment run-off from the major, basin flanking regions. In the Early Triassic the Tethyan monsoon drove seasonal precipitation over the Variscan mountains which transported sediment northward into arid dune fields and playa. In addition, far-travelled fluvial systems supplied sediment from distant, wetter catchments. Through the Middle and Late Triassic the effects of the Tethyan monsoon apparently weakened, and sand-prone fluvial systems draining off the Variscan mountains were more limited in areal extent, but expanded during pluvial episodes. However, Greenland and Fennoscandia maintained sediment supply from the north, with perennial run-off from Fennoscandia able to maintain marshes and levels of vegetation cover not encountered elsewhere in the region and to episodically drive major exorheic drainage systems into the Tethys Sea. Published climatic simulations are consistent with these observations, which indicate that Greenland, and particularly Fennoscandia, had precipitation levels higher than the regions to the south with a positive precipitation: evaporation balance.

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Section: Dryland Terminal Splay Complexesmentioning

confidence: 92%

Section: Upper Triassicmentioning

confidence: 99%

Triassic palaeogeography and fluvial dispersal across the northwest European Basins

2009

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“…5) may be taken as a manifestation of the famous "Carnian pluvial event". Although the reality of this sudden increase of humidity in the Carnian of Europe was seriously doubted by Visscher et al (1994), recent studies supported the idea of the "wet Carnian", evidenced in the Tethys ocean and on the surrounding lands of the Pangaea (Bourquin and Guillocheau 1996;Rigo et al 2007;Porter and Gallois 2008;Kozur et al 2009), also called the "Reingraben event" (Hornung et al 2007).…”

Section: Paleoclimatic Controlmentioning

confidence: 98%

Tectonically-controlled Late Triassic and Jurassic sedimentary cycles on a peri-Tethyan ridge (Villány, southern Hungary)

Vörös¹

2009

Central European Geology

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The article briefly summarizes the history of research of the Villány Mesozoic, with a focus on the Templom-hegy at Villány, and gives short descriptions of the important outcrops of the area. The geologic sketch of the Templom-hegy and concise descriptions of the Upper Triassic Mészhegy Formation, the Pliensbachian Somssichhegy Formation and the Bathonian-Callovian Villány Formation are also given. Several sedimentary cycles were recognized in the early Mesozoic formations exposed on the Templom-hegy. From among them, three fluvio-lacustrine, fining-upward cycles in the Late Triassic and one (or possibly two), marine, fining and deepening upward in the Early Jurassic, are demonstrated and evaluated in detail. The Late Triassic and Early Jurassic cycles at Villány were deposited in a westward-tilted half-graben structure, where repeated tectonic movements were responsible for the episodic and cyclic nature of the sedimentation. The finingupward trends within the three cycles probably reflect climatic changes from humid to arid conditions. For the Middle Jurassic the paleotectonic regime changed: faulting ceased and the territory began to sink uniformly. The Mesozoic subsidence history of the Villány area has close analogies in the contemporaneous blocks of the European inner shelf domain (Helvetic, Briançonnais, (central Penninic, Czorsztyn), and High Tatric Ridges, and the Bihor Autochthon). Their shared features are intensive subsidence in the Early and Middle Triassic, followed by a long interruption of subsidence in the Late Triassic to Middle Jurassic, then a renewed, rapid subsidence in the Late Jurassic. The interrupted subsidence was accompanied by erosion and formation of half-grabens, starting from the mid-Triassic. From this time on, these areas belonged to a transpression/transtension dominated zone for nearly 70 million years, until the Middle/Late Jurassic opening of the ValaisMagura oceanic belt.

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“…It consists of laminated mudstone (M l ). The predominantly dark grey-green color of the sediments and the good parallel lamination indicate deposition in a low energy, perennial freshwater lake below wave base (Porter and Gallois, 2008). Deep lacustrine environment is also inferred from the presence of turbidites in the interfingering delta facies association (see LFA 4).…”

Section: Deep Lacustrine Facies Association (Lfa 3)mentioning

confidence: 98%

Depositional styles of Early Ediacaran terrestrial volcanosedimentary succession in Gebel El Urf area, North Eastern Desert, Egypt

Eliwa

Breitkreuz

Khalaf

et al. 2010

Journal of African Earth Sciences

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Identifying fluvio–lacustrine intervals in thick playa-lake successions: An integrated sedimentology and ichnology of arenaceous members in the mid–late Triassic Mercia Mudstone Group of south-west England, UK

Cited by 33 publications

References 14 publications

Triassic palaeogeography and fluvial dispersal across the northwest European Basins

Triassic palaeogeography and fluvial dispersal across the northwest European Basins

Tectonically-controlled Late Triassic and Jurassic sedimentary cycles on a peri-Tethyan ridge (Villány, southern Hungary)

Depositional styles of Early Ediacaran terrestrial volcanosedimentary succession in Gebel El Urf area, North Eastern Desert, Egypt

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