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Showing 1 to 20 of 25 for “"half-graben"”.
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Fluvial sedimentation in continental half-graben basins
… subsiding basin based on the form of a simple half graben with four interacting supply points of sediment and water that produced an axial fan and longitudinal channel flanked by transverse fans. Imposition of various combinations of lateral and axial sediment flux showed that the locations and …
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Kerogen variation in a Devonian half graben system
… matter. It was deposited into a series of half graben formed by the collapse of over-thickened Caledonian crust. The 14 lake cycles that comprise the Rousay Flagstone Formation (RFF) were correlated across Orkney during 6 months of fieldwork. Two of the lake cycles were sampled in detail …
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Tectonic Setting, Structure, and Seismic Stratigraphy of the Apalachicola Rift and its Overlying Sag Basin in the Northeastern Gulf of Mexico
… Gulf of Mexico (GOM) is a ~220-km- long half-graben that contains 5-8 km of undrilled, syn-rift clastic deposits inferred to be of late Triassic-early Jurassic age. Previous workers have interpreted pre-salt (Triassic-early Jurassic), basinward-dipping, seismic reflectors within the …
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Depositional conditions, stratigraphic evolution, and allo- and autogenic controls of lower Permian non-marine carbonate rocks, Lucaogou low-order cycle, Bogda Mountains, NW china
… carbonate lithofacies in the Tarlong-Taodonggou half graben and the Zhaobishan section were interpreted. Allo- and autogenic factors were identified. They controlled characteristics and distribution pattern of carbonate deposits in regional and local scale, respectively. Allogenic factors include …
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Structural development of a volcanic sequence of the Lahn area during the Variscan orogeny in the Rhenohercynian Belt (Germany)
… orogeny. With it, in the study area full-graben and half-graben basins can be recognized as a full-graben at the Kirschhofen syncline, antithetic half-grabens at the Guntersau-Freienfels and the Freienfels-Ernsthausen sub-areas and synthetic half-grabens at the Ahausen syncline and the …
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Identifying source rocks and reservoir elements of South China Sea grabens using 3D seismic data, West Natuna Basin, Indonesia
… evaluate the source and reservoir potential of half grabens in the Gabus and Belanak surveys in the West Natuna Basin by reconstructing the stratigraphy. The stratigraphic architecture of the folded, asymmetric fill can be imaged by stratal slicing. Utilizing 3D seismic geomorphology from 150 …
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The Muddy Creek Formation: Depositional environment, provenance, and tectonic significance in the western Lake Mead area, Nevada and Arizona
… during faulting resulted in the formation of half-graben basins with coarse-grained sediments of the River Mountain conglomerate forming alluvial fans that were constrained to the basin margins. When extension subsided, coarse-grained material prograded into the basin, forming the Boulder …
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Late Paleozoic basin analysis of the Loppa High and Finnmark Platform in the Norwegian Barents Sea : integration of seismic attributes and seismic sequence stratigraphy
… sedimentary successions of the Loppa High half-graben and the Finnmark platform in the Norwegian Barents Sea (southwest Barents Sea) were investigated using 2D/3D seismic datasets combined with well and core data. These sedimentary successions represent a case of mixed …
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Geology of the Hanover Academy and Ashland quadrangles, Virginia
… margin of the Piedmont a northeast trending half-graben, the Taylorsville Basin, bordered on the northwest by the Fork Church fault, contains rocks of Triassic age. These rocks are divided in this report into four successive conformable formations. Unconsolidated Coastal Plain sediments east …
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Stratigraphic and structural evolution of the early Diligencia Basin, Orocopia Mountains, Southeastern California
… The early Diligencia Basin had an asymmetric half-graben geometry, and formed in response to presently north-south directed extension along a listric detachment located along the northern basin margin. Facies associations determined from five measured sections through the lower Diligencia …
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Depositional systems, sequence architecture, and controlling factors of an Eocene stratigraphic sequence at Minfeng steep margin of Dongying depression, eastern China
… in Minfeng area, the steep margin of Dongying half graben, eastern China, by integrating 3-D seismic, wireline log, and core data, and aims to interpret the depositional systems, reconstruct sequence stratigraphic architecture, and understand the controlling processes and factors at the steep …
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Facies and provenance analysis of the Midcontinent Rift System (MRS) in Kansas
The Midcontinent Rift System (MRS) formed a half-graben that extends into NE Kansas. The Precambrian rift succession, penetrated by Texaco Noel Poersch#1 (NP#1) well in Washington Co. at depths between 2846 and 11300 ft, comprises two successions. The lower one (11300-7429 ft) is dominated by …
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The sedimentology and palaeogeography of some Devonian sedimentary rocks in Southwest Ireland
… northern fault-bounded margin of the extensive half-graben feature known as the Munster Basin. Towards the end of the basin's history, continental conditions were replaced by marginal marine as the sea transgressed into the area from the south. The objectives of the study are to provide a …
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The integration of petrologic and isotopic data from the Boulder Conglomerate to determine the age of the Navan orebody, Ireland
… allochthon deposited in the second order half graben created by major listric normal faults in the Navan area. The base of the Boulder Conglomerate comprises erosive-based, highly immature rock avalanches which are interbedded with hemipelagic limestone. Sulphide mineralisation in the …
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Eocene to Miocene geology of southwest Viti Levu, Fiji
… rocks and is interpreted as a intra/forearc half-graben that may have originated during mid-Oligocene arc rifting. During the Late Oligocene to Middle Miocene Fiji was on line with similar arc-forearc systems in the Lau Ridge-Tonga Platform and Western and Eastern Belts of Vanuatu as part of …
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Fault segmentation and paleoseismicity along the North Wutaishan Fault of the Shanxi Graben System, China
The Shanxi Graben System has been the location of large, devastating intraplate earthquakes in the past, making it an ideal location for the study of the temporal recurrence of intracontinental earthquakes. This study conducts a paleoseismic investigation on the North Wutaishan Fault (NWTSF) at the …
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A seismic study on the structural evolution of the North Celtic Sea Basin, offshore Ireland
… “steer’s head” geometry or alternatively a half graben geometry. Modern 2D and 3D seismic data has now allowed interpretation of faulting at depth within the NCSB. In particular it has demonstrated the importance of intra-basinal faulting and results in a robust updated structural evolution …
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Paleomagnetic and AMS results from Oligocene ash-flow tuffs of the eastern San Juan Mountains : implications for the evolution of the western margin of the San Luis Basin, northern Rio Grande Rift
… Colorado. The SLB is an east-dipping, half graben basin that formed in response to extension beginning ca. 26 Ma in the Cordillera. Oligocene ash-flow tuffs exposed in the eastern San Juan Mountains and along the western margin of the SLB provide an excellent opportunity to study the …
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Cenozoic stratigraphic and tectonic history of the Grenada and Tobago basins as determined from marine seismic data, wells, and onland geology
… The striking similarity in the two basins' half-graben structure, smooth basement character, deep-marine seismic facies, and similar Paleogene sediment thickness suggest that the two basins formed as a single, Paleogene forearc basin related to the now dormant Aves Ridge. This single forearc …
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Tectonic evolution of the Corinth Rift
… the rift has been described as an asymmetric half–graben controlled by N–dipping faults on the southern margin. This view has been challenged by increasing seismic data from the off-shore part of the rift which show it is more complex, analogous to more developed rifts like the East African …
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