Showing papers in "Sedimentary Geology in 2015"

TL;DR: This paper explored the effects of seasonal and yearly variable rainfall and the resultant highly peaked discharge pattern on river morphodynamics, and presented a comparison of modern and ancient monsoonal and subtropical river deposits, by documenting the diversity of the sedimentary facies, macroforms (bar forms), and architectural elements common in ancient and modern monsoon-controlled rivers.

TL;DR: The Lower Cretaceous Quantou Formation has been examined by a variety of methods, including core and thin section observation, XRD, SEM, CL, fluorescence, electron probing analysis, fluid inclusion and isotope testing and quantitative determination of reservoir properties as mentioned in this paper.

TL;DR: In this article, a detailed analysis was produced of the stratigraphic architecture of these MTCs, highlighting the high variability of the seismic facies from tabular bounded strata to chaotic patterns.

TL;DR: The Barbalha Formation (Aptian) as discussed by the authors records deposition in a fluvial and lacustrine environment accumulated in an early post-rift sag basin, and two depositional sequences, showing an overall finingupward trend, are preserved within the succession.

TL;DR: In this paper, the erosional features (0.5-1.km long and 15-20m thick) from the Permian Karoo Basin succession, South Africa, are presented from palaeogeographically well-constrained channel-lobe transition zones; one from Fan 3 in the Tanqua depacentre and one from Unit A5 in the Laingsburg depocentre.

TL;DR: The analysis of the sedimentary dynamics of the carbonate slope of the northwest part of Little Bahama Bank (LBB, Bahamas) reveals a complex interaction between slope destabilisations, off-bank sediment export and longitudinal transport, the latter being driven by the Antilles and the Florida currents, at the northern end of the Florida Strait.

TL;DR: In this article, detrital zircon U-Pb dates from the southern Junggar Basin were obtained and divided into four groups: 488-2537 (basement zircons), 328-482 (subduction-related magmatics), 254-322 (post-collisional magmatic zirons), and 135-250 (syndepositional zircon).

TL;DR: In this paper, a multiproxy study of a new Upper Permian-Lower Triassic section (Xiaojiaba) in Sichuan Province, China, documents large changes in marine productivity, redox conditions and detrital input prior to the latest Permians extinction.

TL;DR: In this paper, multibeam bathymetry data from the southwestern corner of Great Bahama Bank (GBB) image four margin failures and their associated erosional products.

TL;DR: In the Michigamme Formation of the Bijiki iron formation of the United States as mentioned in this paper, granular beds are up to 2 cm thick and peloids are often partially to completely replaced by dolomite and chert.

TL;DR: In this paper, the role of entrainment of mud substrate and subsequent transport processes of muddy substrate for developing co-genetic mud-clast-rich (MCR) divisions was highlighted.

TL;DR: In this article, the authors used optically stimulated luminescence (OSL) data to date the Ica Formation in western Brazilian Amazonia and found that it is of the mid-late Pleistocene age rather than the Plio-Pleistocene.

TL;DR: In this paper, the authors combine heavy mineral analysis and detrital zircon U-Pb dating to shed new light on the middle Miocene-Pliocene provenance evolution at a basin scale.

TL;DR: In this article, an extensive exposure of discrete sand-prone packages in Units D/E and E, Fort Brown Formation, Karoo Basin, South Africa, permit analysis of the sedimentology and stacking patterns of three intraslope lobe complexes and their palaeogeographic reconstruction via bed-scale analysis and physical correlation of key stratal surfaces.

TL;DR: In this article, the impacts of these parameters on porosity and permeability were determined by combining petrographic mineral quantification with conventional core analysis of samples from the Danish part of the North German Basin.

TL;DR: The Parana Basin is a key locality in the context of the Late Paleozoic Ice Age (LPIA) because of its location east of the Andean proto-margin of Gondwana and west of contiguous interior basins today found in western Africa as discussed by the authors.

TL;DR: The sedimentary products of forty-three Neoproterozoic fluvial-channel belts are superbly exposed along the seaboard of Stoer Peninsula, Scotland, UK as discussed by the authors.

TL;DR: In this article, U-Pb LA-ICP-MS analysis on detrital zircons from two samples of Cambrian age (Herreria Formation, Cantabrian Mountains, Spain) revealed very different provenance signatures at the base and top of the formation.

TL;DR: In this paper, the authors examined the Holocene turbidite systems of Lake Kivu and the Pliocene turbidisite system of Lake Albert in the East African Rift using high-resolution 2D and 3D seismic reflection data and sediment core information.

TL;DR: The relationship between the porosity and mineralogy of the Callovo-Oxfordian mudstone was investigated at the small scale (μm-mm) and large scale (m-hm) by using the 3H-PMMA autoradiographic method as discussed by the authors.

TL;DR: In this paper, the authors show that many IRD-free intervals occur at the top of backstepping successions, where they are best interpreted as glacial minima deposits.

TL;DR: The Vaca Muerta Formation is characterized by a decimetre-scale rhythmic alternation of marls and limestones as mentioned in this paper. But these facies associations represent basin to middle carbonate ramp deposits.

TL;DR: In this paper, a comparison of morphometric patterns from the modern and Palaeozoic carbonate data was made, and the results suggest that biotic self-organisation is a fundamental driver of sedimentary patterns on carbonate platforms.

TL;DR: In this paper, the authors combine a paleomagnetic study with sediment grain-size analysis on the Lz908 borehole sedimentary sequence from the southern Bohai Sea to obtain insights into regional geomorphological process since the late early Pleistocene.

TL;DR: In this article, two fabric types occur in the upper part of the metre-scale cycles of the Middle Triassic platform succession in the Transdanubian Range, one of which is microbial boundstone (fabric type 1) and the other is bioclastic dolomite (bioclastic type 3) which is rich in reworked dasycladalean alga fragments.

TL;DR: The Apulian Carbonate Platform (ACP) in southern Italy has experienced several episodes of subaerial exposure, which were in some cases associated with the formation of karst bauxite deposits as mentioned in this paper.

TL;DR: In this article, the authors compare the preserved deposits of braided fluvial systems that were influenced by common allogenic factors (climate, sediment source, delivery style); differences in preserved sedimentary style principally reflect their different tectonics settings.

TL;DR: In this article, the authors analyzed the pyrite framboid size distribution of the sedimentary sequence in Fuente Vidriera section, in the eastern External Subbetic of the Betic Cordillera (Spain), where the Lower Jurassic is represented by alternate layers of marls and many limestones, and the T-OAE is identified by a major delta C-13 excursion, micropalaeontological, and geochemical evidences.

TL;DR: In this paper, a series of papers were presented that concentrate on sedimentation patterns observed on the slopes and within the basins surrounding shallow-water carbonate depositional systems, and four papers discuss depositional patterns on the slope to basin transect of the Cainozoic sedimentary system of the Bahamas; four other papers examine gravity deposits of Jurassic and Cretaceous carbonate systems.

TL;DR: In this article, the shape parameters of sand grains were determined using photos of two-dimensional images of particle projections onto a plane, which were taken under an optical microscope and were then subjected to an image analysis.