Showing papers in "Sedimentary Geology in 1999"

TL;DR: In this paper, the authors present the current understanding of the effects of processes operative during the sedimentation cycle, including weathering at source prior to incorporation in the transport system, mechanical breakdown during transport, weathering during periods of alluvial storage on the floodplain, hydraulic processes during transport and final deposition, and by diagenesis during deep burial.

TL;DR: Carbonatogenesis is the response of heterotrophic bacterial communities to an enrichment of the milieu in organic matter and has been an ubiquitous phenomenon since Precambrian times as discussed by the authors. But it is not restricted to particular taxonomic groups of bacteria nor to specific environments.

TL;DR: In this paper, a hierarchical stacking of depositional sequences of shallow-water, carbonate-dominated sedimentary systems was studied in the Swiss and French Jura, in Spain, and in Normandy, showing that sea-level fluctuations were an important factor in their formation.

TL;DR: The dolomitic distal ephemeral lakes of the Coorong region of South Australia are dynamic systems in which the concentrations of solutes generally increase during late spring and summer when the rate of evaporation greatly exceeds aqueous input as mentioned in this paper.

TL;DR: The ability of carbonatogenic bacteria may be used for producing surficial protecting coatings (biocalcin) on limestones buildings, monuments and statuary as discussed by the authors, which is the concept of biomineralisation.

TL;DR: The provenance of detrital zircons in nineteen littoral and sedimentary deposits in eastern Australia is determined in terms of their isotopic ages measured by Sensitive High Resolution Ion MicroProbe (SHRIMP) as discussed by the authors.

TL;DR: In this paper, the authors investigated the environmental limits to cyanobacterial calcification in fast-flowing streams and found that cyanobacteria preferentially utilize bicarbonate and sheath impregnation by calcium carbonate even where the annual WATEQ4F Saturation Index exceeds 0.8.

TL;DR: In this paper, the bacterial shrubs, crystal shrubs and ray-crystal crusts are classified into three morphological types: (1) bacterial shrub-like morphologies, similar to woody plants, (2) end-members of crystal shrub, and (3) rays of calcite.

TL;DR: In this article, a modified model of Austroalpine Valanginian to Coniacian tectono-sedimentary evolution is proposed based on an onset of subduction of the Penninic Ocean no earlier than Late Cretaceous, and a reconstruction of provenance as proposed in this study.

TL;DR: In this article, the authors demonstrate the crucial influence of mucus substances on carbonate precipitation in highly supersaturated natural environments and demonstrate that the species composition of cyanobacterial biofilms does not appear to be relevant for the formation of microbial carbonates in Pyramid Lake.

TL;DR: Drill cores from the bamer reef-edge of Tahiti exhibit 85-93m-thick coralgal sequences recording at least 13,500 years of continuous reef growth in optimal environmental conditions.

TL;DR: In this paper, the authors conducted extensive two-dimensional and three-dimensional ground-penetrating radar (GPR or georadar) surveys in two quarries within the Rhine valley of northeastern Switzerland.

TL;DR: The Sobrarbe deltaic complex (Eocene of the Ainsa Basin, Spanish Pyrenees) is confined by lateral thrust ramps and influenced by intra-basinal growth anticlines as mentioned in this paper.

TL;DR: In this article, the identification and description of fossil evidence of microbial activity in the Monferrato carbonates is described. But the authors focus on the identification of microbial structures represented by pyritic rods and dolomite tubes.

TL;DR: The Sula Ridge coral reef as mentioned in this paper is the largest known deep-water coral reef in the northeast Atlantic and was discovered in the mid-Norwegian shelf in the early 1990s.

TL;DR: A swarm of vertical gravel-filled dykes up to 6 m high and several decimetres wide, cut through an over-consolidated till at Killiney Bay as mentioned in this paper.

TL;DR: In this article, a set of 5 hydrofacies from 23 possible sediment lithofacies were defined and a digital-photographic mapping procedure was developed to allow fast data acquisition in the field and thus allow the output for further sedimentological or hydrogeological analysis.

TL;DR: In this article, both Recent and fossil tufa deposits from Belgium were studied by petrographical and geochemical means, and they were interpreted to have formed during phreatic and vadose diagenesis.

TL;DR: Chemostratigraphy has been applied to onshore Duckmantian/Stephanian successions encountered in outcrop and penetrated by two boreholes from the West Midlands (U.K.).

TL;DR: In this article, four facies associations have been recognized which, in ascending stratigraphic order, are mudflat, sandy distributary, small gravelly-channel and large gravelly channel.

TL;DR: In this paper, the authors show that hummocky moraine (HM) formed at the margins of Laurentide Ice Sheet (LIS) lobes that flowed upslope against topographic highs.

TL;DR: In this article, the spatial distribution of hydrofacies in braided stream deposits is quantified using a computer model and three-dimensional images showing connected hydrofacies with high permeability facies that form preferential flow paths.

TL;DR: In this article, a laboratory model has been developed, which reproduces natural conditions of beachrock formation, including the porosity of beach sand, tidal movements, temperature, evaporation, illumination, and water composition.

TL;DR: In this paper, the Siwalik Group in Nepal is well exposed in the Surai Khola area (western Nepal), and the Hetauda-Bakiya Kholha area (central Nepal).

TL;DR: In the Maha Sarakham Formation (MSA) of the Khorat and Sakhon Nakhon sub-basins of Thailand and Laos (Thailand and Laos) as mentioned in this paper, the formation is composed of three depositional members that each include evaporitic successions, each overlain by non-marine clastic red beds.

TL;DR: In this article, ground penetrating radar (GPR) surveys have been carried out in order to characterise reflection patterns and to assess the method's potential for imaging palaeofluvial sediments in the Mass-Rhine former confluence area in the southern Netherlands.

TL;DR: In this article, the authors used electric logs and core descriptions acquired during oil and gas exploration in Bangladesh to construct a lithofacies map of Miocene strata, which constrain depositional patterns.

TL;DR: The result of sea level fall at the margins of the Mediterranean during the Late Miocene ''Salinity Crisis'' was the creation of an extensive erosion surface as discussed by the authors. However, the shape of this unconformity reflects local factors and in turn significantly determined local conditions during subsequent reflooding.

TL;DR: The South Pyrenean Foreland Basin contains numerous units of Eocene carbonate megabreccias intercalated with siliciclastic turbidites and derived by resedimentation of shallow-marine carbonate platforms.