La question des conditions probables du climat de l'Autunien et du Saxonien de l'Europe centrale et occidentale

1961 ◽  
Vol S7-III (5) ◽  
pp. 463-467 ◽  
Author(s):  
Horst Falke
Keyword(s):  
Middle Permian ◽  
Lower Permian ◽  
Prevailing Wind ◽  
Great Care ◽  
Atmospheric Conditions ◽  
Humid Climate ◽  
Upper Carboniferous ◽  
Sedimentary Deposits ◽  
Hot Humid Climate ◽  
Desert Climate

Abstract The similarity of upper Carboniferous and Autunian (lower Permian) floras and of faunas, and most of the Autunian sediments, indicates a hot, humid climate interrupted by several dry periods during the Autunian. Saxonian (middle Permian) fauna and sediments show increasing dryness without reaching actual desert climate until the end of the epoch. Conditions differed from basin to basin during both the Autunian and the Saxonian, and relief greatly influenced the climate. Thus flora, fauna, and climate require interpretation with great care. Textures of eolian sedimentary deposits of the Permian give some information concerning prevailing wind directions and atmospheric conditions, but paleomagnetic conditions are poorly known.

GENESIS AND AGE OF THE TOMTOR Nb AND RARE-EARTH DEPOSIT ORE SEQUENCE, NORTHEASTERN SIBERIAN PLATFORM

2021 ◽  
pp. 32-44
Author(s):  
Alexander Tolstov ◽  
Vladimir Cherenkov ◽  
Leonid Baranov
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Siberian Platform ◽  
High Grade ◽  
Geological Data ◽  
Magmatic System ◽  
Humid Climate ◽  
Stratigraphic Unit ◽  
Sedimentary Deposits ◽  
Hot Humid Climate

The northeastern Siberian platform (Republic of Sakha, Yakutia) hosts the Udzhinskaya province of alkaline ultrabasic massifs with carbonatites as final phases of magmatic system evolution; they form i ts central carbonatite core and are characterized by elevated Fe, Al and P concentrations. They also contain a complex of rare and rare-earth elements. Crust of laterite weathering of up to 400 m thick is present within the massifs. Phosphate, Nb, Y, Sc and TR content in crust of carbonatite weathering is much higher compared to unaltered rock differences. Their maximum values are in the sequence of specific sedimentary deposits f ormed a s denudation products of ore-bearing carbonatite crust precipitated in minor lake depressions and due to their intensive chemogenic transformation in hot humid climate. They are unique high-grade ores, with no world analogs in terms of mineral potential. Sometimes, these rocks are their natural concentrates averaging (in weight %) 7,21 Nb2O5, 0,578 Y2O3, 0,045 Sc2O3 and 10,16 TR2O3. The rocks composing the ore-bearing sequence show distinct evidence of sedimentary genesis: well-pronounced layered texture and facial zoning, presence of carbonized vegetable detrite and bacteriomorphic aggregates. Therefore, it is reasonable to regard a set of these formations as an independent stratigraphic unit, Tomtor sequence. Geological data suggest that it formed 340-280 Ma. Tomtor sequence can be an important prospecting criteria in prospecting for rare and rare-earth elements.

scholarly journals MASS FLOW RATE INDUCED BY COMBINED ROOF SOLAR COLLECTOR AND VERTICAL STACK IN A HOT HUMID CLIMATE

2014 ◽  
Vol 9 (1) ◽  
pp. 166-177
Author(s):  
Wardah Fatimah Mohammad Yusoff ◽  
Abdul Razak Sapian ◽  
Elias Salleh ◽  
Nor Mariah Adam ◽  
Zabidi Hamzah
Keyword(s):  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Solar Collector ◽  
Simulation Modelling ◽  
Prevailing Wind ◽  
Local Wind ◽  
Humid Climate ◽  
Hot Humid Climate ◽  
Good Agreement

This paper presents the investigation of solar induced ventilation that utilizes roof solar collector and vertical stack. Three prototypes, namely A, B and C, were developed based on preliminary experimental work. They were then used in simulation study with the objective of determining the prototype that was able to induce the highest mass flow rate. The validation of simulation modelling against experiment indicated a good agreement between these two results. The findings showed that prototype A induced the highest mass flow rate. However, prototype C, which had obstructions at the stack outlets, was more appropriate for application in Malaysia due to various prevailing wind directions. In addition, the findings also indicated that besides solar radiation, the mass flow rate induced by the prototypes was also influenced by the local wind direction, the inlet and outlet positions as well as the outlet design. In summary, the findings highlighted the potential application of the proposed solar induced ventilation in a hot and humid climate.

FIELD ASSESSMENT OF BLACK SPOT RESISTANCE IN ROSES IN A HOT HUMID CLIMATE

2010 ◽  
pp. 115-120 ◽  
Author(s):  
D.H. Byrne ◽  
N. Anderson ◽  
M. Orwat ◽  
V. Soules
Keyword(s):  
Black Spot ◽  
Humid Climate ◽  
Field Assessment ◽  
Hot Humid Climate

scholarly journals Stratigraphy and depositional history of the Upper Palaeozoic and Triassic sediments in the Wandel Sea Basin, central and eastern North Greenland

1989 ◽  
Vol 143 ◽  
pp. 21-45
Author(s):  
L Stemmerik ◽  
E Håkansson
Keyword(s):  
Early Carboniferous ◽  
Upper Permian ◽  
Lower Permian ◽  
Late Permian ◽  
The West ◽  
Depositional History ◽  
Lower Carboniferous ◽  
Upper Carboniferous ◽  
Lithostratigraphic Units ◽  
History Of

A lithostratigraphic scheme is erected for the Lower Carboniferous to Triassic sediments of the Wandel Sea Basin, from Lockwood Ø in the west to Holm Land in the east. The scheme is based on the subdivision into the Upper Carboniferous - Lower Permian Mallemuk Mountain Group and the Upper Permian - Triassic Trolle Land Group. In addition the Upper Carboniferous Sortebakker Formation and the Upper Permian Kap Kraka Formation are defined. Three formations and four members are included in the Mallemuk Mountain Group. Lithostratigraphic units include: Kap Jungersen Formation (new) composed of interbedded limestones, sandstones and shales with minor gypsum - early Moscovian; Foldedal Formation composed of interbedded limestones and sandstones -late Moseovian to late Gzhelian; Kim Fjelde Formation composed of well bedded Iimestones - late Gzhelian to Kungurian. The Trolle Land Group includes three formations: Midnatfjeld Formation composed of dark shales, sandstones and limestones - Late Permian; Parish Bjerg Formation composed of a basal conglomeratic sandstone overlain by shales and sandstones - ?Early Triassic (Scythian); Dunken Formation composed of dark shales and sandstones - Triassic (Scythian-Anisian). The Sortebakker Formation (new) is composed of interbedded sandstones, shales and minor coal of floodplain origin. The age is Early Carboniferous. The Kap Kraka Formation (new) includes poorly known hematitic sandstones, conglomerates and shales of Late Permian age.

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