Latest Paleozoic-Early Mesozoic Paleography, Northwestern Africa

Houten, Franklyn B. Van; Brown, Roy H.

doi:10.1086/628282

Cited by 15 publications

(5 citation statements)

References 7 publications

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“…The southern Algarve basin has a nearly complete Callovian in a facies of yellowish gray limestone and marl, truncated by an erosional surface and a thin deposit of yellowish brown middle Oxfordian marly limestone, overlain by thick deposits of Kimmeridgian sandstones and dolomitic limestones. The central "Lusitanian" basin displays a gradual regression in the middle and upper Callovian as pelagic limestones and marls gave way to oolite marine facies during o In order to avoid a monotonous recital of references after each statement, the main consulted publications and personal comunications for this section are: Subbetic-Prebetic: Garcia-Hernandez et al (1980);Iberian Cordillera: G. Melendez (personal communication, 1981), A. Goy (personal communication, 1982, Rios (1978); Portugal: R. B. da Rocha (personal communication, 1981), da Rocha (1976, da Rocha and Marques (1979), RugetPerrot (1961);and North Africa: Van Houten (1977), Van Houten and Brown (1977), Evans andKendall (1977), Durand Delga (1967). the late Oxfordian and early Kimmeridgian, before succumbing to a continental and shallow-shelf environment.…”

Section: Sedimentation Historymentioning

confidence: 99%

Jurassic Sedimentation History of Site 534 (Western North Atlantic) and of the Atlantic-Tethys Seaway

Ogg¹,

Roberston²,

Jansa³

1983

Initial Reports of the Deep Sea Drilling Project

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Site 534 reflects a complex interplay of global, basinal, and local influences on sedimentation during the Callovian and Late Jurassic. Rifting and rapid subsidence of the continental margins of the North Atlantic-Tethys seaway occurred during the late Early Jurassic (Sinemurian-Pliensbachian), but rapid spreading between the North American margin (Blake Spur Ridge and magnetic lineation) and the northwest African margin did not commence until the Bathonian or earliest Callovian.Site 534, drilled on marine magnetic anomaly "M-28" of Bryan et al. (1980), was initially about 150 km from either continental margin. The ?middle Callovian basal sediments are dusky red silty marl. Callovian transgression led to active carbonate platforms on the margin, recorded at Site 534 as a rise in the CCD (carbonate compensation depth), then arrival of lime-rich turbidites from the Blake Plateau platform across the Blake Spur Ridge. The host pelagic sediment is greenish black, organic-rich, radiolarian-rich, silty claystone. Hydrothermal activity on the nearby spreading ridge enriched this lower unit in metals. In the Oxfordian, the input of terrestrial silt rapidly diminished; radiolarians or other bioclasts were not preserved. The dark variegated claystone has fine-grained marl and reddish claystone turbidite beds. The late Callovian-Oxfordian Western Tethys has radiolarian chert deposition, marine hiatuses, or organic-rich sediments.The Kimmeridgian and Tithonian had a stable or receding sea level. Near the end of the Jurassic many of the carbonate platforms of the margins were buried beneath prograding fan or alluvial deposits. Carbonate deposition shifted to the deep sea. Site 534 records the deepening of the CCD and ACD (aragonite compensation depth) during the Kimmeridgian and early Tithonian, then a rise of the ACD in the middle Tithonian. Similar trends occurred throughout the Western Tethys-Atlantic. High nannofossil productivity of the seaway led to deposition of very widespread white micritic limestone in the late Tithonian-Berriasian. The underlying sediment had a slower deposition rate of carbonate, therefore its higher clay and associated Fe content produced a red marl. A short sea-level incursion occurred on the Atlantic margins during the Kimmeridgian and is reflected in the Site 534 greenish gray marl unit by numerous turbidite beds of shallow-water carbonates.

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Section: Sedimentation Historymentioning

confidence: 99%

Jurassic Sedimentation History of Site 534 (Western North Atlantic) and of the Atlantic-Tethys Seaway

Ogg¹,

Roberston²,

Jansa³

1983

Initial Reports of the Deep Sea Drilling Project

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“…Whereas a number of these are clearly related to reactivated Late Carboniferous to Early Permian faults (e. g. Polish-Danish Trough, The Triassic rifts of Western and Central Europe are characterisied by a general lack of volcanism; the wrench-related Aquitaine Basin is an exception and finds its counterparts in the similarly wrench-related volcanic Triassic rifts of southern Iberia and northern Africa, and in the Late Triassic grabens on the North American Atlantic shelf (MANSPEIZE~ et al 1978, VaN HOUTEN andBROWN 1977). Whereas a number of these are clearly related to reactivated Late Carboniferous to Early Permian faults (e. g. Polish-Danish Trough, The Triassic rifts of Western and Central Europe are characterisied by a general lack of volcanism; the wrench-related Aquitaine Basin is an exception and finds its counterparts in the similarly wrench-related volcanic Triassic rifts of southern Iberia and northern Africa, and in the Late Triassic grabens on the North American Atlantic shelf (MANSPEIZE~ et al 1978, VaN HOUTEN andBROWN 1977).…”

Section: Discussionmentioning

confidence: 99%

“…Volcanism associated with the development of these basins culminated during the latest Triassic and earliest Jurassic (VAN HOUTEN andBROWN 1977, MANSPEIZEI/ et al 1978). In a broader sense, however, Late Triassic and Early Jurassic times appear to correspond to a period of increased teetonie activity.…”

Section: E Rhaetian Transgressionmentioning

confidence: 99%

Triassic rifts and facies patterns in Western and Central Europe

Ziegler

1982

Geol Rundsch

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ZusammenfassungDie Entwicklung von West-und Mitteleuropa w/ihrend der Trias stand unter dem Zeichen der regionalen Krustenausdehnung, die sich in der Absenkung komplexer Grabensysteme widerspiegelt. Die Trias-Gr~iben yon West-und Mittelenropa sind ein wichtiger Bestandteil der Riftsysteme Arktis-Nordatlantik und Tethys-Zentral Atlantik-Golf yon Mexico, denen entlang Pangea im Lanfe des Mesozoikum und Kenozoikum auseinanderbrach.Die Trias-Gr~ben Europas senkten sieh vom friihen Skythian an kontinulierlich und ohne diskrete tektonische Pulse ab. Die Gr~iben, yon denen manche bis zu 4000 m Sedimente enthalten, waron im allgemeinen nieht mit Vulkanismus verbunden.Die Fazies der Trias-Serien spiegelt die differenzielle tektonische Subsidenz der verschiedenen Gr~iben und TrSge wider, so wie Variationen der Sedimentzufuhr und wiederholte Fluktuationen des Meeresspiegels.Ende der Perms zog sich die Arktische See vom n6rdlichen und s6dlichen Perm-Becken zurfick. Vom sp~iten Skythian an beeinflul3ten Tethys-Transgressionen die Sedimentation im sfidlichen Perm-Becken. Erste Transgressionen erreichten dieses dutch den Polnischen Trog, sp~iter aber auch durch die Burgundische und Hessische Senke. Zu Beginn des Keuper wurde die Meeresverbindung durch den Polnischen Trog unterbrochen.Im n6rdlichen Perm-Becken ist die Trias in kontinentaler Rot-Fazies entwickelt. Die Arktische See reichte erst im sp~ten Norian in die n6rdlichsten Teile des Viking-Grabens hinein. Die Rh~it-Transgression war der Vorl~iufer der Sp~it-Sinemurian-Verbindung der Arktis-und Tethys-Meere dutch das Nordsee-Gebiet.In der Mittel-und Sp~it-Trias stiel3 die Tethys durch den Biskaya Rift und die davon abzweigenden Gr/iben naeh Westen vor. In der Sp/it-Trias wurde Iberia seitlich von Meeresstral3en umgeben, die sieh dureh die Grabensystenae von Nord-Afrika, Nenfundland-Lusitania und Biskaya ausdehnten.Ein zyklischer Anstieg des Meeresspiegels w~ihrend der Trias vernrsaehte eine fortschreitende Ausdehnung der Ablagerungsgebiete. Zeitliche Absenkungen des Meeresspiegels verursaehten die Entwicklung regionaler Diskordanzen, besonders entlang den Beckenriindern, z. B. w~ihrend des mittleren Buntsandsteins, des Mittel-Kenpers und an der Rh~t-Basis. Die Entwicklung von West-und Mitteleuropa w~ihrend der Trias spiegelt den Beginn des Zerfalls von Pangea wider und die dafiir verantwortliche globale Platten-Reorganisation. AbstractThe Triassic evolution of Western and Central Europe was governed by regional crustal extension that induced the subsidence of a complex network of grabens and troughs. These formed an integral part of the Arctic-North Atlantic and the Tethys-~) Address of the author: Dr. P. A. ZIEGLEIR, Shell Intemationale Petroleum Maatsehappij B. V., Central Atlantic-Gulf of Mexico rift and rift-wrench systems which, in the course of the Mesozoic and Cenozoic, developed into major break-up axes of Pangea.The Triassic grabens of Western and Central Europe began to subside during the Early Seythian and continued to do so, without evidence for discrete riftin...

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“…During that time, no final continental boundaries existed between the future African, European and American continents. FAURE-MURET, 1962;LORENZ, 1988;SALVAN, 1974SALVAN, , 1984; VAN HOUTEN & BROWN, 1977). AE = Argana-Essaouira, Be = Berrechid, BF = Bou Fekrane, Dou = Doukkala, G = Kh6misset, Mou = Moulouya, R = Rharb, Ms = Mousa ou Salah, OuC = Ourika and Central, ZG = Ziz-Guir.…”

Section: Triassic and Earliest Liassicmentioning

confidence: 99%