Showing papers in "Sedimentary Geology in 2006"

TL;DR: In this article, the authors propose an integrated scenario that revives the key points of the previous model with new statements about the chronology, depositional settings, hydrological mechanisms, consequences and correlations with the global changes.

TL;DR: New preliminary findings on both the diversity and distribution of y-proteobacterial SRB in lithifying and non-lithifying microbial mat systems are presented and demonstrate the close microspatial association of SRB and cyanobacteria in the oxic zone of the mat.

TL;DR: General circulation models (GCMs) use the laws of physics and an understanding of past geography to simulate climatic responses as discussed by the authors, which can be used effectively in the prediction of oceanic upwelling sites and the distribution of petroleum source rocks.

TL;DR: In this article, a spectrum of sedimentary structures is recognized, all of which occur over a wide range of scale: 1. cross-bedding with humpback, sigmoidal and ultimately low-angle cross-sectional foreset geometries (interpreted as recording the transition from dune to upper plane bed bedform stability field), 2. planar/flat lamination with parting lineation.

TL;DR: The Song Hong (Red River) delta has been examined comprehensively in relation to sediment discharge and sea-level changes in this article, and the morphological change from a funnel-shaped to straight coast is interpreted to have been closely related to a hydrologic regime shift from a tide-dominated bay-head setting to a wave-influenced open-coast setting.

TL;DR: In this article, a comparison between the tectonic and palaeogeographic evolution of the Mediterranean region from the Oligocene to the present shows that the isolation of Mediterranean region is a progressive process that started some 30-35 Ma ago.

TL;DR: In this article, the authors reveal long-term changes over the past 3000 Myr that include a peak of abundance 1250 Myr ago, Late Proterozoic decline, Cambrian resurgence, and fluctuating decline during the remainder of the Phanerozoic.

TL;DR: In this paper, the microbial mat and underlying sediment were studied as a unique system to define the boundary conditions responsible for high Mg-calcite and dolomite formation.

TL;DR: The passive margin Texas Gulf of Mexico Coastal Plain consists of coalescing late Pleistocene to Holocene alluvial-deltaic plains constructed by a series of medium to large fluvial systems as discussed by the authors.

TL;DR: In this article, the authors described the sedimentary facies, provenance and grain-size distributions of the 1993 tsunami deposits in the lower reaches of Usubetsu River, and identified four stratigraphic units: Unit 1, Unit 2, Unit 3, and Unit 4.

TL;DR: In this article, the relative contributions of physical and biological environmental factors controlling stromatolite shape were investigated in the Highborne Cay reef system and other locations in Exuma Cays, Bahamas.

TL;DR: In this paper, Masson et al. used the term "Lago-Mare" to characterize the brackish to fresh water environment which occurred within the Mediterranean at the end of the Messinian.

TL;DR: In this article, the authors investigate the effectiveness of various types of stratigraphic horizons in terminating opening-mode fractures in two different carbonate rock sequences: a relatively homogeneous dolomite sequence, in Door County, WI and an interbedded chalk and marl sequence within the Austin Chalk, TX.

TL;DR: In this paper, a second-order depositional sequence of the Lower Cenomanian Bahariya Formation was constructed based on the lateral and vertical changes between shelf, subtidal, coastal and fluvial facies.

TL;DR: In this paper, three alternative mechanistic models are presented that may allow cyanobacterial boring to proceed and be still consistent with available evidence, as well as microbiological and geologic/geochemical principles.

TL;DR: In this paper, the authors present an overview of the current status of the long effort to understand the effect of geological heterogeneity on flow using numerical simulations and present a broader interpretation of the idea of hydrofacies, long used by hydrogeologists.

TL;DR: In this article, the authors focus on the sequence stratigraphic implications of the Taebaek Group (Cambrian-Ordovician), a mixed carbonate-siliciclastic sequence in the mideastern part of the Korean peninsula.

TL;DR: In situ microbialites occurring in reef rocks dredged between 80 and 130 m water depth on the modern fore-reef slopes of Tahiti and the Marquesas islands yield ages ranging from 17,100 ± 2900 to 4410 ± 2250 years BP, suggesting that they played a prominent role during the last deglacial sea level rise as mentioned in this paper.

TL;DR: In this paper, 2D and 3D seismic data from the Levant margin (Eastern Mediterranean) has revealed the complex depositional and structural setting of the basinwide late Miocene (Messinian) evaporites.

TL;DR: In the Carpathian Foredeep Basin, the formation of the Badenian foraminifers is attributed to a tectonic closure of connection with the Tethys.

TL;DR: The Plio-Pleistocene Zarzal Formation corresponds to fluvio-lacustrine sediments deposited in an intramontane depression within the Colombian Andes, associated with the Cauca-Romeral Fault System as discussed by the authors.

TL;DR: In this article, it was shown that the sea level drop of the Mediterranean during the Messinian Salinity Crisis has dramatically enhanced continental erosion and in particular regressive fluvial erosion.

TL;DR: In this article, the presence of stenohaline biotas in siliciclastic deposits interbedded with the gypsum and in the Messinian post-evaporitic sediments, challenges the view that a long-standing large body of brackish water (the Lago Mare) filled the Western Mediterranean following the MSC and prior to Early Pliocene flooding.

TL;DR: In this paper, a combination of both diffusion limited aggregation (DLA) and cellular automata (CA) is proposed for the exploration of the stromatolite morphological space and a representation of the intrinsic and extrinsic factors responsible for natural stromatomite morphogenesis.

TL;DR: The Late Paleoproterozoic Athabasca basin contains more than 1.5 km of predominantly sandy strata, most of which are of braided fluvial origin this paper.

TL;DR: In this article, the authors examined the hypotheses for three Late Miocene events to illustrate how this approach allows us to test implied hydrologic scenarios and exclude incompatible models, including pre-evaporite restriction of the Mediterranean, the initiation of salt precipitation, and connection between the Sea of Marmara and both Paratethys and the Mediterranean during the Messinian.

TL;DR: In this paper, two cores from Brazos, Texas, spanning the Cretaceous-Paleogene (K-P) boundary, are investigated by a multidisciplinary approach aiming at unraveling environmental changes and sequence stratigraphic setting.

TL;DR: In this article, the authors examined the geometrical relationships of these erosion surfaces with the deep basin facies deposited in the abyssal Provencal Basin during the Messinian Salinity Crisis.

TL;DR: In this article, rare earth element geochemistry of siliceous deposits from which hydrothermal activity and basin evolution are elucidated, in the Late Devonian in the Yangshuo basin, South China, was presented, and the authors suggested both nodular and bedded cherts formed in the open marine basin of South China rather than in the intracontinental rift basin as previously assumed, with involvement both with seawaters as indicated by intermediate negative Ce anomalies and generally LREE-depleted patterns, and convex, less LREE depleted patterns with apparent positive

TL;DR: In this paper, the authors investigated three possible models: (1) telogenetic alteration; (2) detrital input and (3) role of iron-bacteria in the origin of red pigmentation present in many Phanerozoic limestones.