THE DEPOSITIONAL HISTORY OF A PORTION OF THE NORTH PERTH BASIN—A SINGLE WELL DIPMETER ANALYSIS

1971 ◽  
Vol 11 (1) ◽  
pp. 90
Author(s):  
K. J. Bird ◽  
W. F. Coleman ◽  
H. Crocker
Keyword(s):  
First Generation ◽  
Source Area ◽  
Lower Triassic ◽  
Flood Plain ◽  
Upper Jurassic ◽  
Lower Jurassic ◽  
Depositional History ◽  
The North ◽  
Single Well ◽  
History Of

Four-arm dipmeter interpretation has been integrated with other wireline logs, lithologic and palaeontologic data, and regional geology to arrive at a history of the deposition in a portion of the North Perth Basin.The Permian sediments were deposited in a moderate to low energy, paralic to marine environment. They were unconformably overlain by a thin transgressive Lower Triassic sand and deepwater marine shale. The Middle Triassic sediments were deposited as a regressive marine sequence under the influence of a strong southwesterly uplift, and culminated in piedmont talus deposits of Upper Triassic age.In the Lower Jurassic this area evolved through a flood-plain environment to a paralic environment with a northeast-southwest oriented coastline and a northern source area. During the Middle Jurassic gentle crustal movements, coupled with an increasingly active northern and eastern source area, resulted in several cycles of nearshore deposition, and finally a marine transgression.Subsequent violent tectonic uplift to the east in the Upper Jurassic produced massive first generation sands which were deposited in a mainly continental environment.

THE TECTONIC ELEMENTS OF THE PERTH BASIN

1972 ◽  
Vol 12 (1) ◽  
pp. 17
Author(s):  
D.K. Jones ◽  
G.R. Pearson
Keyword(s):  
Lower Triassic ◽  
Upper Jurassic ◽  
Lower Jurassic ◽  
Tectonic Activity ◽  
Lower Permian ◽  
Fault Activity ◽  
The North ◽  
Basin Subsidence ◽  
Geophysical Surveys ◽  
Extreme North

Birth and growth of the highly faulted Perth Basin was dominated by the Darling Fault which down-throws an essentially elongate sedimentary trough against a Precambrian Shield to the east. The Precambrian Northampton and Leeuwin Blocks restrict the basin to the north and the south. The Perth Basin embraces four major sub- basins separated by intra-basin uplifts. These sub-basins are the Dandaragan and Sunbury Troughs and the Abrolhos and Vlaming Sub-basins. Major intra-basin uplifts include the Beagle, Turtle Dove and Harvey Ridges, and the Edwards Island Block.Surface outcrop is representative of only a small part of the total stratigraphic column. Deposition of Ordovician - Silurian sediments in only the extreme north of the basin was followed by a long period of non-deposition. Sedimentation recommenced in the Lower Permian and continued with minor breaks throughout the Mesozoic and into the Tertiary. The Permian had a widespread distribution, as did the Triassic and Jurassic which attained maximum thickness in the Dandaragan Trough. A major intra-Neocomian unconformity developed in the Vlaming Sub-basin where up to 20,000 ft. of pre-unconformity Neocomian and 5,000 ft. of post-unconformity marine Cretaceous sediments were deposited. Tertiary sediments were deposited in both the Vlaming and Abrolhos Sub-basins.Limited movement on the Darling Fault in Permian and Lower Triassic times led to gentle basin downwarp. Renewed fault activity in the Upper Triassic resulted in rapid basin subsidence, and less violent fault activity continued through the Lower Jurassic. The most severe tectonic activity and basin subsidence, with local uplift, occurred in the Upper Jurassic and Neocomian, at which time graben-collapse of a mid-basin arch offshore from Perth formed the Rottnest Trench. This intra-Neocomian tectonism was probably associated with .sea floor spreading, the westerly drift of India from Australia, and the break up of Gondwanaland.This structural synthesis of the Perth Basin is largely derived from geophysical surveys and deep drilling carried out over the past twenty-three years on the present leases of West Australian Petroleum Pty. Limited (WAPET).

The geology of the Bristol Channel floor

1973 ◽  
Vol 274 (1244) ◽  
pp. 595-626 ◽  
Keyword(s):  
Source Area ◽  
Upper Jurassic ◽  
Lower Jurassic ◽  
Gravity Corer ◽  
Side Scan Sonar ◽  
The North ◽  
Reconnaissance Survey ◽  
Clastic Sediments ◽  
Jurassic Rocks ◽  
A Minor

A reconnaissance survey has been made with side-scan sonar, Boomer and gravity corer of a sea-floor area extending from the mouth of the River Severn to the longitude of Hartland Point, and from the North Devon coast to the latitude of Porthcawl. The results include the recognition of two major WNW -ESE trending synclines arranged en echelon with a minor intervening pericline. The eastern syncline, traceable to the longitude of Watchet and preserving Upper Pliensbachian (Lower Jurassic) rocks in its core, is the seaward extension of the Glastonbury Syncline. The western syncline, of which little more than the eastern half could be investigated, includes a sequence of Jurassic rocks up to high Kimeridge Clay. This Bristol Channel Syncline is cut by a series of N W -SE trending tear-faults analogous to those in southwest England and has its southern m argin truncated by a strike fault with northerly transport. The Jurassic sequence is unusual in its abnormal thickness (in excess of 1600 m) and its predominantly argillaceous nature. Thick limestones are unknown, although cementstone bands occur, mainly in the Lower Lias. Sands and sandstones were found only in beds of Upper Oxfordian and, dubiously, of Portlandian (Middle Volgian) age. Elsewhere in the succession, and notably for the Aalenian-Lower Callovian interval, the correlatives of thick carbonate sequences of m ainland successions are thin sands and sandy clays or non-sequences. The Bristol Channel region may therefore have supported a lesser depth of water than other basins in southern England. Facies changes within the area are small. They offer no support to the hypothesis of a Welsh island, but suggest the possibility of a Cornubian source area for clastic sediments in early Upper Jurassic times.

Late Quaternary depositional history of the North Evvoikos Gulf, Aegean Sea, Greece

2006 ◽  
Vol 232 (3-4) ◽  
pp. 157-172 ◽  
Author(s):  
T.H. Van Andel ◽  
C. Perissoratis
Keyword(s):  
Late Quaternary ◽  
Aegean Sea ◽  
Depositional History ◽  
The North ◽  
History Of

Provenance of Jurassic sedimentary rocks of south-central Quesnellia, British Columbia: implications for paleogeography

2004 ◽  
Vol 41 (1) ◽  
pp. 103-125 ◽  
Author(s):  
Nathan T Petersen ◽  
Paul L Smith ◽  
James K Mortensen ◽  
Robert A Creaser ◽  
Howard W Tipper
Keyword(s):  
Detrital Zircon ◽  
Middle Jurassic ◽  
Sedimentary Rocks ◽  
Source Area ◽  
Lower Jurassic ◽  
Early Jurassic ◽  
Late Triassic ◽  
Nd Isotopes ◽  
South Central ◽  
History Of

Jurassic sedimentary rocks of southern to central Quesnellia record the history of the Quesnellian magmatic arc and reflect increasing continental influence throughout the Jurassic history of the terrane. Standard petrographic point counts, geochemistry, Sm–Nd isotopes and detrital zircon geochronology, were employed to study provenance of rocks obtained from three areas of the terrane. Lower Jurassic sedimentary rocks, classified by inferred proximity to their source areas as proximal or proximal basin are derived from an arc source area. Sandstones of this age are immature. The rocks are geochemically and isotopically primitive. Detrital zircon populations, based on a limited number of analyses, have homogeneous Late Triassic or Early Jurassic ages, reflecting local derivation from Quesnellian arc sources. Middle Jurassic proximal and proximal basin sedimentary rocks show a trend toward more evolved mature sediments and evolved geochemical characteristics. The sandstones show a change to more mature grain components when compared with Lower Jurassic sedimentary rocks. There is a decrease in εNdT values of the sedimentary rocks and Proterozoic detrital zircon grains are present. This change is probably due to a combination of two factors: (1) pre-Middle Jurassic erosion of the Late Triassic – Early Jurassic arc of Quesnellia, making it a less dominant source, and (2) the increase in importance of the eastern parts of Quesnellia and the pericratonic terranes, such as Kootenay Terrane, both with characteristically more evolved isotopic values. Basin shale environments throughout the Jurassic show continental influence that is reflected in the evolved geochemistry and Sm–Nd isotopes of the sedimentary rocks. The data suggest southern Quesnellia received material from the North American continent throughout the Jurassic but that this continental influence was diluted by proximal arc sources in the rocks of proximal derivation. The presence of continent-derived material in the distal sedimentary rocks of this study suggests that southern Quesnellia is comparable to known pericratonic terranes.

The St. Eugene Formation and the Development of the Southern Rocky Mountain Trench

1974 ◽  
Vol 11 (7) ◽  
pp. 916-938 ◽  
Author(s):  
John J. Clague
Keyword(s):  
Rocky Mountain ◽  
Flood Plain ◽  
The United States ◽  
The North ◽  
Early Oligocene ◽  
Half Graben ◽  
History Of ◽  
Composition Structure ◽  
Southern Rocky Mountain ◽  
Block Faulting

The Tertiary history of the southern Rocky Mountain Trench is inferred from a study of the distribution, stratigraphy, fabric, lithologic composition, structure, and palynology of the Miocene St. Eugene Formation in southeastern British Columbia.The St. Eugene Formation consists of flood-plain and fan facies and represents the upper part of up to about 1500 m of sediments which accumulated in the proto-Rocky Mountain Trench upon cessation of Laramide deformation and after initiation of extension and block faulting in the eastern Cordillera during Eocene or early Oligocene time. Deep Tertiary basins in the southern Rocky Mountain Trench are bounded on the east and west by high-angle faults parallel to the Trench margins and on the north and south by faults transverse to the trend of the Trench. Block faulting of a half-graben style was probably contemporaneous with sediment deposition, but at least 600 m of displacement on the east boundary fault postdates deposition of the St. Eugene Formation. Although there is no present seismic activity along the Rocky Mountain Trench north of latitude 49°N, Holocene fault scarps and earthquakes in a zone along the Rocky Mountains of the United States attest to the continuation of block faulting south of 49°N.The St. Eugene microflora includes at least 39 genera of ferns, gymnosperms, and anthophytes. Phytogeographic reconstruction based upon the habitats of extant counter-parts indicates floral elements growing on poorly drained lowlands, adjacent slopes, and montane uplands; thus, there was moderate to high relief in southeastern British Columbia during St. Eugene time. The climate apparently was temperate, with warm summers, mild winters, and abundant, uniformly distributed precipitation. This contrasts with the present climate of the southern Rocky Mountain Trench which is semiarid with hot summers and cold winters, and suggests that the mountain barriers which presently restrict cool, moist, Pacific maritime air masses to the coast were lower during the Miocene, or that the polar seas were relatively warm.

scholarly journals Material composition of Lower Triassic sandstones from the northern areas of the Timan-Pechora oil and gas province

2020 ◽  
Vol 9 ◽  
pp. 26-36
Author(s):  
N. N. Timonina ◽  
Keyword(s):  
Oil And Gas ◽  
Chemical Properties ◽  
Source Area ◽  
Lower Triassic ◽  
Heavy Fraction ◽  
Clastic Rocks ◽  
The North ◽  
Northern Areas ◽  
Formation Conditions ◽  
Physical And Chemical

Recently various authors paid much attention to accessory minerals of clastic rocks to clarify the composition of the source area and formation conditions of terrigenous deposits. The paper describes some minerals of the heavy fraction of Triassic sandstones in the north of the Timan-Pechora oil and gas province (garnet, epidote, chromium spinels, ilmenite, etc.). We showed that the enrichment of sandstones with various mineral grains was controlled by not only the composition of the eroded rocks, but also by the hydrodynamics of the flow, as well as the method of transfer of clastic material. We noted that the features of heavy fraction minerals could be used to reconstruct sedimentation environments, taking into account their physical and chemical properties, distribution of minerals by fractions, and their stability during transportation.

scholarly journals Depositional History of Paleocene Sediments in the Offshore Canterbury Basin, New Zealand

2021 ◽  
Author(s):  
◽  
Sanjay Paul Samuel
Keyword(s):  
Seismic Data ◽  
The South ◽  
Depositional History ◽  
Reservoir Rocks ◽  
The North ◽  
Late Paleocene ◽  
Shelf Slope ◽  
History Of ◽  
Well Correlation ◽  
First Time

<p>The Paleocene interval within the Canterbury Basin has been relatively understudied with respect to the Neogene and Cretaceous intervals. Within the Paleocene interval is the Tartan Formation and the Charteris Bay Sandstone, which are potential source and reservoir rocks respectively. These two formations have not been previously mapped in the offshore Canterbury Basin and their limits have not been defined. This study utilises a database of nearly 12,000km of 2D seismic data together with data from four open–file wells and sidewall core samples from three wells and newly availiable biostratigraphic information to better constrain the chronostratigraphical interpretation of seismic data. Seismic mapping together with corroboration from well correlation and core lithofacies analysis revealed new insights into the development of the offshore Canterbury Basin through the Paleocene. These include the delineation of the lateral extents and thicknesses of the Tartan Formation and Charteris Bay Sandstone and location of the palaeo shelf–slope break and also the development of a new well correlation panel that incorporates the Tartan Formation for the first time.  This study presents four new paleogeographic maps for the offshore Canterbury Basin that significantly improves our understanding of the development of the basin during the Paleocene. These maps show that during the Earliest Paleocene, the mudstones of the Katiki Formation were being deposited in the south of the study area, with the siltier sediments of the Conway Formation being deposited in the north. The coarser grained Charteris Bay Sandstone was deposited from Early to possibly Middle Paleocene in the northeast. The mudstones of the Moeraki Formation were being deposited in the south at this time. From Middle to Late Paleocene, the mudstones of the Moeraki Formation were deposited in the south and these mudstones onlapped against the Charteris Bay Sandstone which remained as a high in the north. The Tartan Formation was deposited during the Late Paleocene in the central and southern areas of the offshore Canterbury Basin, during a relative fall in sea–level. Deposition had ceased in the north of the study area or erosion possibly removed Late Paleocene sediments from there. During the Latest Paleocene, the mudstones of the Moeraki Formation were deposited over the Tartan Formation in the central and southern parts of the offshore Canterbury Basin with the northern area undergoing erosion, sediment bypass or both.</p>

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