Essai de synthèse stratigraphique et palynologique du système dévonien en Lybie occidentale

Massa, D.; Moreau-Benoit, A.

doi:10.2516/ogst:1976010

Cited by 56 publications

(36 citation statements)

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“…Massa & Moreau-Benoit (1976) described spore assemblages from a thick sequence of Silurian-Devonian deposits from the Rhadames Basin of western Libya. Massa & Moreau-Benoit (1976) described spore assemblages from a thick sequence of Silurian-Devonian deposits from the Rhadames Basin of western Libya.…”

Section: Comparison With Spore Assemblages Of Similar Agementioning

confidence: 99%

Spore assemblages from the Lower Devonian ‘Lower Old Red Sandstone’ deposits of the Rhynie outlier, Scotland

Wellman

2006

Transactions of the Royal Society of Edinburgh: Earth Sciences

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Since the late 1980s an extensive programme of trenching/borehole drilling has been undertaken in order to study the Lower Devonian 'Lower Old Red Sandstone' deposits of the Rhynie outlier in the Grampian Highlands of Scotland. The boreholes have provided new information on the stratigraphical succession and geological structure of the Rhynie outlier, both of which were hitherto poorly understood due to the paucity of good surface exposure and the complex geological relationships of the deposits. One hundred and eighteen palynological samples were collected, representing much of the stratigraphical sequence of the inlier, of which 106 were productive. Productive samples yield assemblages of well preserved palynomorphs, dominated by spores and phytodebris, but also containing arthropod cuticle and rare freshwater algal remains. The spore assemblages are systematically described and two new genera and six new species proposed. They are similar throughout the sequence and the spores belong to the polygonalis-emsiensis Spore Assemblage Biozone of Richardson & McGregor (1986) and the PoW Oppel Zone (possibly Su Interval Zone) of Streel et al. (1987), indicating an early (but not earliest) Pragian-?earliest Emsian age range, that may possibly be restricted to latest Pragian-?earliest Emsian. The palynomorph assemblages contain only terrestrial forms, supporting sedimentological interpretation of the deposits as 'Lower Old Red Sandstone' fluviatile and lacustrine deposits, with occasional extrusive volcanics and volcaniclastic sediments intercalated. The palynomorphs are of variable thermal maturity (within and between samples), probably reflecting differential heating associated with the complex volcanic/hydrothermal system. The new palynological data provide, for the first time, a reliable biostratigraphical age for the deposits, and suggest that they accumulated relatively rapidly. Spore biostratigraphy and thermal maturity studies facilitate correlation of the tectonically complex deposits, and shed light on other aspects of the geological history of the outlier. The palynomorph assemblages also aid interpretation of the biota of the Rhynie basin, including the exceptionally preserved biotas of the Rhynie and Windyfield cherts.

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Section: Comparison With Spore Assemblages Of Similar Agementioning

confidence: 99%

Spore assemblages from the Lower Devonian ‘Lower Old Red Sandstone’ deposits of the Rhynie outlier, Scotland

Wellman

2006

Transactions of the Royal Society of Edinburgh: Earth Sciences

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“…Biostratigraphic data (e.g. Massa et al, 1980;Coquel and Massa, 1993;Mergl and Massa, 2000) suggest that they all occur within the Viséan. One sequence boundary (SB 5) was identified within the Serpukhovian lower Assedjefar Formation (Fig.…”

Section: Sequence Stratigraphymentioning

confidence: 96%

“…The boundary between the Assedjefar and the Dembaba Formation in Awaynat Wanin is defined using biostratigraphic data from Massa et al (1980) and Berendeyev (1985). A thickness of 110 m was measured in the outcrop.…”

Section: Assedjefar Formationmentioning

confidence: 99%

Sedimentological and sequence stratigraphic analysis of Carboniferous deposits in western Libya: Recording the sedimentary response of the northern Gondwana margin to climate and sea-level changes

Fröhlich

Petitpierre

Redfern

et al. 2010

Journal of African Earth Sciences

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a b s t r a c tDetailed sedimentological and sequence stratigraphic analysis of Carboniferous (Tournaisian to Moscovian) strata exposed in the north-western Murzuq Basin and southern Ghadames Basin, western Libya, provides new insights into the sedimentary response of the northern Gondwana margin to climate and sea-level change.The Lower Carboniferous Marar and Assedjefar Formations can be divided into five depositional sequences of 3rd order. In total 27 facies types are defined, grouped into four facies associations: offshore shales, shallow marine clastics, fluvial sandstones and marine carbonates.The bulk of the Lower Carboniferous interval is dominated by an alternation of offshore shales and shallow marine clastics, which were deposited during the transgressive and highstand systems tracts. The clastic deposits mostly consist of laterally persistent coarsening and thickening upward cycles with a common succession from basal hummocky cross-stratified sandstones to ripple-laminated sandstones, capped by multidirectional cross-stratified sandstones.Within the lowstand systems tracts, lenticular sandbodies have been identified, which vary in thickness from 1.5 m (ca. 40 m wide) to 50 m (ca. 1.5 km wide). These are interpreted to be fluvial channel complexes based on their geometry, erosive base, and presence of thick stacked sandstones with unidirectional planar and trough cross-bedding, the absence of bioturbation and occurrence of land plant fragments. These channel complexes mostly cut down into offshore shales, and are interpreted to be bound at the base by sequence boundaries. Palaeogeographic maps generated for each lowstand system show the location and palaeoflow direction of these fluvial channel complexes. They are interpreted to represent large incised valleys filled with thick fluvial sandstones. Their identification and distribution indicates repeated exposure of large areas of western Libya, most-likely controlled by major eustatic sea-level changes.The Assedjefar Formation exibits a gradual decrease in coarse clastic sediment supply throughout the Serpukhovian and by the Bashkirian and Moscovian during the deposition of the Dembaba Formation a carbonate depositional system was established. Limestones are dominantly made up of a heterozoan fauna (brachiopods, crinoids, bryozoans, gastropods) and are mostly preserved as shallow marine storm and coastal deposits. It is hypothesised that a local increase in aridity and/or the gradual erosion and decreasing topography of the hinterland mountains, with the resulting reduction in discharge, controlled this shift from clastic to carbonate deposition.Available data indicate that the Murzuq Basin was interconnected with the Ghadames Basin at this time and is a postdepositional basin with respect to the Carboniferous interval. The sedimentological and sequence stratigraphic data from the present study offer new insights into the depositional setting and facies distribution in the Carboniferous, and the recognition of major incised fluvial systems has signifi...

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“…They were defined in Algeria, Tunisia and western Al Qarqaf (Bonnefous, 1963;Burollet and Manderscheid, 1967a-b;Conant and Goudarzi, 1967;Massa and Jaeger, 1971;Bishop, 1975;Massa and Moreau-Benoit, 1976;Bellini and Massa, 1980;Klitzsch, 1963Klitzsch, , 1966Klitzsch, , 1970Klitzsch, , 1981Willis, 1981;Vos, 1981;Whitbread and Kelling, 1982;Massa and Delort, 1984;Castro et al, 1985;Echikh, 1998;Belhaj, 1996Belhaj, , 2000. They are described (Fig.…”

Section: Lithostratigraphymentioning

confidence: 99%

Remote sensing and field analysis of the Palaeozoic structural style in NW Libya: The Qarqaf arch a paleo-transfer fault zone between the Ghadamis and Murzuq basins

Chorowicz

Benissa

2016

Journal of African Earth Sciences

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Essai de synthèse stratigraphique et palynologique du système dévonien en Lybie occidentale

Cited by 56 publications

References 0 publications

Spore assemblages from the Lower Devonian ‘Lower Old Red Sandstone’ deposits of the Rhynie outlier, Scotland

Spore assemblages from the Lower Devonian ‘Lower Old Red Sandstone’ deposits of the Rhynie outlier, Scotland

Sedimentological and sequence stratigraphic analysis of Carboniferous deposits in western Libya: Recording the sedimentary response of the northern Gondwana margin to climate and sea-level changes

Remote sensing and field analysis of the Palaeozoic structural style in NW Libya: The Qarqaf arch a paleo-transfer fault zone between the Ghadamis and Murzuq basins

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