Microfauna, Palynomorphs, and Biostratigraphy of the Upper Bajocian Garantiana garantiana Zone (Middle Jurassic) of the Bolshoi Zelenchuk River Basin, North Caucasus

2021 ◽  
Vol 29 (1) ◽  
pp. 36-54
Author(s):  
V. V. Mitta ◽  
L. A. Glinskikh ◽  
Yu. N. Savelieva ◽  
O. V. Shurekova
Keyword(s):  
River Basin ◽  
Middle Jurassic ◽  
North Caucasus ◽  
Upper Bajocian

scholarly journals First record of an erymid lobster (Crustacea, Decapoda) from the upper Bajocian of Northwest Bulgaria

2021 ◽  
Vol 50 (2) ◽  
pp. 69-74
Author(s):  
Lubomir Metodiev ◽  
Docho Dochev ◽  
Svetlozar Seferinov ◽  
Silviya Petrova
Keyword(s):  
Eastern Europe ◽  
Middle Jurassic ◽  
First Record ◽  
Upper Bajocian ◽  
Single Locality

Fossil chela of an erymid lobster from a single locality of the upper Bajocian in the Western Fore-Balkan Mts (NW Bulgaria) was studied. Two segments of the thoracic appendages, probably belonging to one individual, were described: 1) P1 propodus with partially preserved pollex and dactylus; and 2) P1 carpus and P1 merus attached. These elements of the first pair of pereiopods of a lobster were identified as Eryma compressum (Eudes-Deslongchamps, 1842). Eryma compressum a is well-known taxon from numerous Jurassic localities in Europe but has not been recorded in Bulgaria to date. Therefore, albeit being an isolated finding with only a few elements, the Bulgarian example contributes to the overall record of European erymid faunas from the Middle Jurassic, and especially in Eastern Europe, from where only a few erymids have been reported.

Les olistholites du Riou d'Entraix et leur signification paleostructurale

1966 ◽  
Vol S7-VIII (3) ◽  
pp. 401-404
Author(s):  
Philippe Artru
Keyword(s):  
Middle Jurassic ◽  
Deep Basin ◽  
Upper Bajocian

Abstract The upper Bajocian (middle Jurassic) heterogeneous polygene breccias of the Riou d'Entraix (southeast France) are interpreted as olistostromes formed by gravity sliding along a paleoscarp. The scarp was to the east, in the area presently covered by overthrusts, and separated a euxinic deep basin from a well-oxygenated shallow shelf. Similar deposits in the Barcelonette window and the semi-window at Embrun are probably of the same origin.

Middle Jurassic Retroceramids and Unionids from the Izhma River Basin, North of European Russia

2020 ◽  
Vol 28 (4) ◽  
pp. 381-401
Author(s):  
V. A. Zakharov ◽  
A. P. Ippolitov ◽  
N. G. Zverkov ◽  
P. A. Beznosov ◽  
D. N. Kiselev
Keyword(s):  
River Basin ◽  
Middle Jurassic ◽  
European Russia

scholarly journals Abnormally high content of noble metals in wastes of the Fiagdon concentration plant: a possible new type of mineralization for the North Caucasus is gold-platinoid with base metals, localized in the Early-Middle Jurassic black shales

2021 ◽  
Author(s):  
А.Г. Гурбанов ◽  
А.Я. Докучаев ◽  
В.М. Газеев ◽  
О.А. Гурбанова
Keyword(s):  
Noble Metal ◽  
Black Shale ◽  
Middle Jurassic ◽  
Black Shales ◽  
North Caucasus ◽  
Concentration Plant ◽  
The North ◽  
Icp Ms ◽  
Polymetallic Mineralization ◽  
Gold Platinum

На Северном Кавказе благороднометалльное (золото, серебро, платина, элементы платиновой группы) оруденение черносланцевого типа локализовано в тоар-ааленских флишоидных углеродсодержащих терригенных отложениях, приуроченных к региональной Самуро-Белореченской металлогенической зоне (СБМЗ) – от Дагестана до Адыгеи и Краснодарского края. Вовлечение в поисково-разведочные работы этого стратегического минерального типа оруденения дает возможность расширить минерально-сырьевую базу Южного федерального округа России. Цель исследований – выявление содержаний благородных металлов и элементов платиновой группы (ЭПГ) в промышленных отходах Фиагдонской обогатительной фабрики (ФОФ) и в рудовмещающих тоар-ааленских черносланцевых толщах. ФОФ, в частности, перерабатывала руды полиметаллических месторождений Кадат и Какадур, локализованных в тоар-ааленских флишоидных углеродсодержащих терригенных отложениях Авсандур-Ламардонского рудного поля (АЛРП). Проведена оценка АЛРП на возможность выявления здесь промышленно значимого золото-платиноидного с полиметаллами оруденения в черносланцевой толще. Методы исследования. ICP-MS анализом проанализированы 5 проб в Центре «ИГЕМ-Аналитика» на масс-спектрометре X-Series IIи 13 проб – в Лаборатории физико-химических и химических методов анализа ИМГРЭ на приборе Elan 6100 DRC. Результаты работы. Установленные в 18 пробах (в керне скважин) Фиагдонского хвостохранилища (ФХ) повышенные содержания благородных металлов можно объяснить наличием как в рудах АЛРП, так и во вмещающей их нижне-среднеюрской углеродсодержащей песчано-глинистой флишоидной толще нового для Северного Кавказа нижне-среднеюрского золото-платиноидного cполиметаллами оруденения в черносланцевой толще (2,5-3,2 мас. % УГВ). Предложена модель образования золото-платинового оруденения черносланцевого типа за счет конвекции вадозных вод в высоко металлоносных (Au, Ag, Pt, Pd) ранне-среднеюрских флишоидных толщах алевролито-аргиллитового состава. При поисковых работах на золото-кварцевый, золото-сульфидный и колчеданно-полиметаллический с золотом типы оруденения в Горной Осетии и в восточной части Горного Дагестана был выявлен ряд перспективных на золото объектов.В пределах СБМЗ может быть выявлен ряд промышленно значимых объектов с золото-платиноидным с полиметаллами оруденением в черносланцевых толщах тоар-ааленского возраста. Предложен комплекс мероприятий с минимальными временными, материальными и финансовыми затратами. In the North Caucasus noble-metal (gold, silver, platinum, elements of the platinum group (PGE)) mineralization of the black-shale type is localized in Toar-Aalenian flysch-like organic matter rich, terrigenous sediments in the regional (from Dagestan to Adygea and Krasnodar Territory) Samuro-Belorechenskaya metallogenic zone (SBMZ). Involvement in prospecting and exploration of this strategic type of mineralization provides the opportunity to expand the mineral resource base of the Southern Federal District of Russia. The Aim of the research is to identify the content of platinum and PGE in the industrial wastes of the Fiagdon concentration plant (FCP) and in the ore-bearing Toar-Aalenian black shale strata. In particular, processed ores of the Kadat and Kakadur polymetallic deposits, localized in Avsandur-Lamardon ore field (ALOF). The ALRP was prospected for economic gold-platinum with polymetallic deposit in the black-shales series. Methods. ICP-MS analysis - 5 samples were analyzed by ICP-MS in IGEM-Analytics Center on an X-Series II mass spectrometer and 13 samples - in the Laboratory of Physical-Chemical and Chemical Methods of Analysis of the IMGRE on the Elan 6100 DRC instrument. Results. The elevated noble metal concentrations established in 18 samples (borehole core samples) from the Fiagdon tailings dump could be explained by the presence of both the ALRP ores and the gold-platinum with polymetallic mineralization in the host Toar- Aalenian black-shales series (2.5-3.2 wt. % of carbonaceous matter). The model of formation of gold-platinum mineralization at the expense of vadose water convection in highly metalliferous (Au, Ag, Pt, Pd) Early-Middle Jurassic flysch-like strata of siltstone-argillite composition is proposed. During prospecting works for gold-quartz, gold-sulfide and colliery-polymetallic with gold types of mineralization in the Mountain Ossetia and in the eastern part of Mountain Dagestan a number of promising objects for gold were revealed. A number of economic significant objects with gold-platinum with polymetallic mineralization in black-shale series of Toar-Aalenian age can be identified within the SBMZ. A complex of prospecting with minimal time, material and financial expenses is proposed

scholarly journals Shallow marine syn-rift sedimentation: Middle Jurassic Pelion Formation, Jameson Land, East Greenland

2003 ◽  
Vol 1 ◽  
pp. 813-863 ◽  
Author(s):  
Michael Engkilde ◽  
Finn Surlyk
Keyword(s):  
Sea Level ◽  
Middle Jurassic ◽  
Large Scale ◽  
Significant Shift ◽  
Shallow Marine ◽  
East Greenland ◽  
Upper Bajocian ◽  
Stacking Pattern ◽  
Facies Associations ◽  
Middle Callovian

The Middle Jurassic Pelion Formation – Fossilbjerget Formation couplet of Jameson Land, East Greenland, is a well-exposed example of the Middle Jurassic inshore–offshore successions characteristic of the rifted seaways in the Northwest European – North Atlantic region. Early Jurassic deposition took place under relatively quiet tectonic conditions following Late Permian – earliest Triassic and Early Triassic rift phases and the Lower Jurassic stratal package shows an overall layer-cake geometry. A long-term extensional phase was initiated in Middle Jurassic (Late Bajocian) time, culminated in the Late Jurassic (Kimmeridgian–Volgian), and petered out in the earliest Cretaceous (Valanginian). The Upper Bajocian – Middle Callovian early-rift succession comprises shallow marine sandstones of the Pelion Formation and correlative offshore siltstones of the Fossilbjerget Formation. Deposition was initiated by southwards progradation of shallow marine sands of the Pelion Formation in the Late Bajocian followed by major backstepping in Bathonian–Callovian times and drowning of the sandy depositional system in the Middle–Late Callovian. Six facies associations are recognised in the Pelion–Fossilbjerget couplet, representing estuarine, shoreface, offshore transition zone and offshore environments. The north–southtrending axis of the Jameson Land Basin had a low inclination, and deposition was sensitive to even small changes in relative sea level which caused the shorelines to advance or retreat over tens to several hundreds of kilometres. Eight composite sequences, termed P1–P8, are recognised and are subdivided into a total of 28 depositional sequences. The duration of the two orders of sequences was about 1–2 Ma and 360,000 years, respectively. The Upper Bajocian P1–2 sequences include the most basinally positioned shallow marine sandstones, deposited during major sealevel lowstands. The lowstands were terminated by significant marine flooding events, during which sandstone deposition was restricted to northern, more proximal parts of the basin. The Upper Bajocian – Middle Bathonian P3–4 sequences show an overall progradational stacking pattern. The sequence boundary at the top of P4 marks a significant shift in stacking pattern, and the Upper Bathonian – Middle Callovian P5–8 sequences show large-scale backstepping, terminating in a widespread condensed succession at the distal, southern end of the basin. The largescale backstepping was governed by combined tectonically-induced subsidence, reflecting increased rates of extension, and eustatic sea-level rise. The depositional trends of the Pelion Formation – Fossilbjerget Formation couplet provide a well-exposed analogue to contemporaneous subsurface deposits which form major hydrocarbon reservoirs on the west Norway shelf, and in the Northern North Sea.

Redox conditions during sedimentation of the Middle Jurassic (Upper Bajocian–Bathonian) clays of the Polish Jura (south-central Poland)

Facies ◽  
2008 ◽  
Vol 55 (1) ◽  
pp. 103-114 ◽  
Author(s):  
Michał Zatoń ◽  
Leszek Marynowski ◽  
Patrycja Szczepanik ◽  
David P. G. Bond ◽  
Paul B. Wignall
Keyword(s):  
Middle Jurassic ◽  
Redox Conditions ◽  
Central Poland ◽  
South Central ◽  
Upper Bajocian

Detailed biostratigraphic scales as based on the palaeobiogenetical approach (an example of the Upper Bajocian – Lower Bathonian ostracod scale of the Russian Platform)

2017 ◽  
pp. 121-0 ◽  
Author(s):  
Yana Shurupova ◽  
Ekaterina TESAKOVA
Keyword(s):  
New Species ◽  
Middle Jurassic ◽  
Russian Platform ◽  
Its Phylogeny ◽  
Upper Bajocian ◽  
Predominant Type ◽  
The Family ◽  
Two New Species ◽  
Ammonite Zones ◽  
Lower Bathonian

Two new species of ostracods of the family Progonocytheridae Sylvester-Bradley Camptocythere (C.) lateres Tesakova et Shurupova, sp. nov. and C. (C.) angustius Tesakova et Shurupova, sp. nov. from the Michalskii and Besnosovi ammonite zones (Upper Bajocian – Lower Bathonian, Middle Jurassic) of the Sokur section (Saratov) are described. The changes in ontogenesis in the phylogeny of Camptocythere (C.) lateres Tesakova et Shurupova in the stratigraphical interval corresponding to the Palaeocytheridea kalandadzei ostracod Zone, and especially to the beds with C. (C.) lateres, have been studied. The levels of the change in the predominant type of sculpture (corresponding to evolutionary boundaries) are recognized in the sculpture development among the adult representatives of the species in its phylogeny. This palaeobiogenetic (heterochrony) approach allows subdivision of the beds with C. (C.) lateres into three stratigrapical intervals characterized by changes in the type of sculpture.

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