Sur la geologie de l'Egee; regard sur la Crete (Grece)

1965 ◽  
Vol S7-VII (5) ◽  
pp. 787-821 ◽  
Author(s):  
Jean Aubouin ◽  
Jean Dercourt
Keyword(s):  
Sedimentary Cover ◽  
Metamorphic Rocks ◽  
Normal Faulting ◽  
Tectonic Feature ◽  
Differential Uplift

Abstract The oldest rocks exposed on Crete (Greece) are Paleozoic? metamorphic rocks. Five series are represented in the overlying sedimentary cover, whose deposition took place in a geosynclinal environment from Triassic to Eocene time. Molasse deposits are the principal representatives of the late geosynclinal phase (Miocene); marls and limy sandstones and conglomerates were formed during the postgeosynclinal phase (Pliocene). Major faults are the dominant tectonic feature of the island. Two nappes are identified: the Pindus nappe on which the ophiolitic (sub-Pelagonian) nappe is superimposed in places. Differential uplift and intense normal faulting have broken the island into a number of massifs separated by lowlands.

A cored Jurassic sequence from north Lincolnshire, England: stratigraphy, facies analysis and regional context

1982 ◽  
Vol 119 (2) ◽  
pp. 113-134 ◽  
Author(s):  
M. J. Bradshaw ◽  
S. R. Penney
Keyword(s):  
Facies Analysis ◽  
Sediment Source ◽  
The South ◽  
Tectonic Feature ◽  
Regional Context ◽  
East Midlands ◽  
Rock Bed ◽  
Jurassic Sequence

SummaryA virtually complete Jurassic sequence recently drilled in north Lincolnshire is considered in a regional context. Liassic thicknesses and facies are largely unexceptional. The Frodingham and Pecten Ironstones are relatively thin and sandy, but the Marlstone Rock Bed is thicker and more ferruginous than elsewhere in the region. The Inferior Oolite is exceptionally thick and exhibits strong deltaic influence; equivalents of the Gristhorpe Member and Scarborough Formation of Yorkshire may be present. The Great Oolite was deposited in coastal-lacustrine-deltaic environments, more proximal than to the south or east. Thin Kellaways Clay separates the argillaceous Cornbrash from the Kellaways Sand. The organic-rich Lower Oxford Clay is thin owing to a basal non-sequence whilst the Upper Oxford Clay is condensed and less organic than in the East Midlands. The regressive West Walton Beds are followed by very thick Ampthill and Kimmeridge Clay sections beneath the Spilsby Sandstone. Regional thickness and facies analysis records the behaviour of the Market Weighton Block and reveals the influence of the Pennine High as both a positive tectonic feature and an occasionally active sediment source.

Microearthquake surveys in the Central and Northern Philippines

1979 ◽  
Vol 69 (6) ◽  
pp. 1889-1902
Author(s):  
H. K. Acharya ◽  
J. F. Ferguson ◽  
V. Isaac
Keyword(s):  
Short Duration ◽  
Ultramafic Rocks ◽  
Tectonic Feature ◽  
North Central ◽  
Manila Trench ◽  
Highly Active ◽  
West Central ◽  
Manila Bay ◽  
Large Earthquakes

abstract Microearthquake surveys were carried out in three sections of Central and Northern Philippines during 1975-1976 for a period of 5 months. A 4-month survey of Bataan Peninsula identified a major tectonic feature near Manila Bay which could not have been postulated from examination of seismicity maps. This feature appears to be situated near the southern end of ultramafic rocks of West Central Luzon and West Luzon Trough and trends W-SW from east of Corregidor Island toward Manila Trench for a distance of about 100 km. This survey also showed no microearthquake activity beneath two presently inactive volcanoes on Bataan Peninsula. The rate of activity in Bataan Peninsula region was found to be very low (8.4 events/1000 km2/yr). A short-duration survey (16 days) of the Philippine Fault in North Central Luzon revealed no microearthquake activity on the fault. During a third short-duration survey (16 days), the Verde Island Passage area between Luzon and Mindoro was found to be as highly active at the microearthquake level as it is for large earthquakes.

scholarly journals Geodetic evidence for passive control of a major Miocene tectonic boundary on the contemporary deformation field of Athens (Greece)

2014 ◽  
Vol 56 (6) ◽  
Author(s):  
Michael Foumelis ◽  
Ioannis Fountoulis ◽  
Ioannis D. Papanikolaou ◽  
Dimitrios Papanikolaou
Keyword(s):  
Velocity Field ◽  
Passive Control ◽  
Geodetic Network ◽  
Deformation Field ◽  
Deformation Pattern ◽  
Northwestern Part ◽  
Strain Rates ◽  
Tectonic Feature ◽  
Southeastern Part ◽  
Tectonic Boundary

<p>A GPS-derived velocity field is presented from a dense geodetic network (~5km distance between stations) established in the broader area of Athens. It shows significant local variations of strain rates across a major inactive tectonic boundary separating metamorphic and non-metamorphic geotectonic units. The southeastern part of Athens plain displays negligible deformation rates, whereas towards the northwestern part higher strain rates are observed, indicating the control of the inactive tectonic boundary on the contemporary deformation field of the region. These findings are in agreement with previous geological observations, however, due to the dense local GPS network it was fatherly possible to localize and quantify the effect of such a major inherited tectonic feature on the deformation pattern of the area.</p>

HYDROCARBON SIGNIFICANCE OF UPPER PALAEOZOIC SEDIMENTS ASSOCIATED WITH THE KOBURRA TROUGH, GALILEE BASIN

1974 ◽  
Vol 14 (1) ◽  
pp. 59
Author(s):  
R. J. Allen
Keyword(s):  
Bituminous Coal ◽  
Oil And Gas ◽  
Geological Survey ◽  
Upper Permian ◽  
Synthetic Fuels ◽  
Tectonic Feature ◽  
Hydrocarbon Traps ◽  
Deep Wells ◽  
Show Evidence ◽  
Coal Measures

The Koburra Trough is a major tectonic feature in the northeastern Galilee Basin of Queensland. The oldest rocks identified in exploratory drilling were Devonian sandstone, shale and siltstone, possibly representing a northern extension of the Adavale Basin. These rocks contain a fossil microflora and may be prospective for hydrocarbons. Overlying them are a maximum of 1979 m of Upper Palaeozoic sediments, and a maximum of 1180 m of Triassic sediments, together comprising the Galilee Basin succession. The lithofacies of the Late Palaeozoic is dominantly sandstone-shale; the lower beds show evidence of glacial derivation, and the upper beds contain coal measures. Shows of oil and gas have been recorded from the basal part of the sequence in the two deep wells (ENL Lake Galilee −1 and FPN Koburra −1) drilled in the trough. Structural and stratigraphic factors favour the existence of hydrocarbon traps on the south-western flank. "Large" inferred reserves of Upper Permian sub-bituminous coal have been discovered in Geological Survey exploration near outcrop at the southeastern end. Preference in the use of this coal is to be given to manufacture in Queensland of synthetic fuels and petrochemicals. The geological survey petroleum statigraphic drilling campaign is providing invaluable new data on the Galilee Basin.

A regional perspective of the Quetico metasedimentary belt, Superior Province, Canada

1989 ◽  
Vol 26 (4) ◽  
pp. 677-693 ◽  
Author(s):  
John A. Percival
Keyword(s):  
Central Zone ◽  
Superior Province ◽  
Crustal Melting ◽  
Tectonic Feature ◽  
Polyphase Deformation ◽  
First Order ◽  
Mineral Assemblages ◽  
Tectonic Development ◽  
Accretionary Prisms ◽  
Volcanic Belts

Alternating greenstone–granite and metasedimentary gneiss belts are a first-order tectonic feature of the southern Superior Province. The tectonic development of the Quetico metasedimentary belt is reviewed with regard to depositional, structural, and metamorphic–plutonic history. Over its 1200 km length, the belt consists of marginal metasedimentary schists of turbiditic origin and interior metasedimentary migmatite and peraluminous leucogranite. Polyphase deformation has resulted in a steep easterly-striking foliation and regional, gently east-plunging stretching lineation. Metamorphic grade varies in a low-P facies series from greenschist at the belt margins to upper amphibolite and local granulite in the central migmatite – intrusive granite zone. Mineral assemblages in the central zone yield estimates of metamorphic pressure that increase systematically eastward over 800 km from about 250 MPa (2.5 kbar) near the Canada – United States border to 600 MPa (6 kbar) in granulites adjacent to the Kapuskasing structural zone.Geochronology suggests that sediments were deposited at approximately the same time as active volcanism in adjacent volcanic belts, although evidence of volcanic–sedimentary stratigraphic contiguity is weak as a result of later transcurrent movement parallel to major lithological boundaries. Adjacent belts are inferred to have been contiguous since common D2 deformation, 2689–2684 Ma ago. Major plutonism and associated metamorphism occurred in the Quetico Belt approximately 2670–2650 Ma ago, significantly later than major plutonism in the adjacent volcanic belts.The linear disposition of greywacke-rich sediments over 1200 km invites an analogy with modern accretionary prisms. However, the high-temperature, low-pressure metamorphism of the Quetico Belt is inconsistent with such a low-heat-flow environment, and a change in tectonic regime would be required to account for the metamorphism and intracrustal plutonism. Simple cessation of subduction beneath the thick sedimentary prism could have led to restoration of isotherms, with possible attendant crustal melting and isostatic recovery.

scholarly journals Austrochlamys heardensis (Fleming, 1957) (Bivalvia: Pectinidae) from Central Kerguelen Plateau, Indian Ocean: palaeontology and possible tectonic significance

2004 ◽  
Vol 16 (3) ◽  
pp. 329-338 ◽  
Author(s):  
PATRICK G. QUILTY ◽  
COLIN V. MURRAY-WALLACE ◽  
JASON M. WHITEHEAD
Keyword(s):  
Lateral Displacement ◽  
Natural Boundary ◽  
Kerguelen Plateau ◽  
Tectonic Feature ◽  
The Third ◽  
North East ◽  
South West ◽  
Heard Island ◽  
Tectonic Significance ◽  
First Time

Austrochlamys heardensis (Fleming) is recorded from a boulder of Late Pliocene (3.62–2.5 Ma) volcaniclastic sandstone dredged 70 km east-north-east of Heard Island, the third record of the species. The collection is much larger than the original described by Fleming and includes left valves which are described for the first time. The species is compared with A. anderssoni (Hennig) from Cockburn Island and ‘Chlamys’ mawsoni Fletcher from Îles Kerguelen. The source rock accumulated in fully marine, highly current-affected conditions. The collection is dominated by right valves, possibly because left valves are more susceptible to breakage and the effects of current winnowing. The locality may have subsided some 500 m since deposition. It lies immediately north of a straight, north-east–south-west trending lineament which may mark a major tectonic feature with left-lateral displacement of approximately 50 km, and provides a natural boundary within the Central Province of Kerguelen Plateau.

The structure and geological evolution of the English Channel

1975 ◽  
Vol 279 (1288) ◽  
pp. 3-20 ◽  
Keyword(s):  
Upper Cretaceous ◽  
Surface Expression ◽  
Tectonic Feature ◽  
Eastern Province ◽  
Crustal Thinning ◽  
Geological Evolution ◽  
Igneous Activity ◽  
Lower Palaeozoic ◽  
Subsequent Opening ◽  
Tectonic Line

The Channel consists of three distinct provinces each characterized by its own geological style. The Western Province has rocks ranging in age from Lower Palaeozoic to Miocene with marked unconformities beneath the Upper Cretaceous and the Eocene strata. A major tectonic feature is a line of faults extending east-northeast up Channel. The Central Province is dominated by three fault or monoclinal structures and has rocks ranging from Jurassic to Eocene age. The Eastern Province is a relatively stable area dominated by a Tertiary syncline and a continuation of the Wealden anticline. Events related to the development of oceanic crust in Permian times are believed to have caused basic igneous activity, rifting and crustal thinning in the Western Channel and these factors and the subsequent opening of the Atlantic exerted a control over the development of the Channel. Alpine tectonism led to renewed movement on some structures. Folds are thought to be the surface expression of movements on old fault planes. The importance of a tectonic line between the Isle of Wight and northern France is emphasized.

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