Showing papers in "Sedimentary Geology in 1985"

TL;DR: In the Paleozoic graywackes of eastern Australia there is an increase in the total abundance of rare earth elements (REE), a light to heavy REE ratio and a decrease in the chondrite normalized Eu anomaly with the increase in SiO2/Al2O3 and K2O/Na2O ratios.

TL;DR: In this paper, a comparison between the Laingsburg flood deposits and fluvial sandstones of the Permian Lower Beaufort in the southwestern Karoo region of South Africa is made.

TL;DR: In the eastern Anti-Atlas (Morocco) as mentioned in this paper, a platform and basin topography was established during the late Devonian, probably as a result of early Variscan tensional tectonics.

TL;DR: In this paper, the Maltese phosphorites are related to other phosphorite areas in Sicily and a major province of Miocene phosphogenesis is proposed to account for these occurrences, which extends along the western margins of the Malta-Ragusa Rise.

TL;DR: In this paper, a detailed sedimentologic documentation of the lithofacies, cyclicity, sandbody geometry, palaeoflow variability and depositional models of the youngest late orogenic deposits of the Siwalik molasse was provided.

TL;DR: The results show that the fine-to-medium-grained sands are water-wet, fine- to mediumgrained, moderately well sorted, mesokurtic and positively skewed to near symmetrical.

TL;DR: The distinction between coal-bearing upper and lower delta plain deposits in the rock record may be based on the presence or absence of features indicative of basinal influence, and on the geometry of coal seams.

TL;DR: In this article, a detailed mineralogical investigation of dust fallout deposits collected at eleven locations in Kuwait during April 1979-March 1980 was carried out and the mineralogy of five size fractions, medium sand, fine sand and very fine sand, coarse silt and clay, was determined.

TL;DR: The Middle Proterozoic Dala sandstone covers an extensive area in west-central Sweden and the adjacent parts of Norway, but it is poorly exposed as mentioned in this paper, and only two facies have been distinguished: Facies A, an aeolian dune facies, and Facies B, a wet interdune facie.

TL;DR: The Gulf of Aqaba is dominated by alluvial fans that prograde directly into the sea and can be subdivided into four types: (1) largely inactive fans that merge into a braided fluvial system and pass seaward into sabkha flats, lagoons, mangroves and fringing reefs; (2) large alluial fans with one major entrenched channel and a fringing reef with a large incised canyon; (3) medium-sized (1.5 km long, 3.4 km wide) moderate to highly active

TL;DR: In this paper, four types of rocky shore are recognized: Type 1 with platform and notch and a full range of morphologic features; Type 2 with sandy beach; Type 3 with breccia; and Type 4 with truncated profile.

TL;DR: In this article, the authors examined the roundness properties of quartz grains from various types of Recent aeolian deposits in Kuwait and confirmed that rounded and well-rounded grains are relatively rare.

TL;DR: In this paper, the Late Precambrian Biri oolites of southern Norway were found to have a variety of calcite fabrics which are interpreted as the result of replacement of aragonite.

TL;DR: In this article, a 55 km long, east-west oriented strike section through a thick succession of dominantly clastic post-Variscan deposits in the Spanish Pyrenees south of Andorra was studied.

TL;DR: In the case of the 1980 and 1982 eruptions of Mount St. Helens, Washington, transported and oriented numerous stumps and logs as discussed by the authors, showing that trees can be good paleocurrent indicators.

TL;DR: The main depositional mechanisms acting in aeolian systems can be assessed in two different and independent ways: first by the internal anatomical approach with analysis of the cross-stratification fabric, and second by the external morphological approach with study of shape and surface features of dunes as mentioned in this paper.

TL;DR: The Wollogorang Formation of the unmetamorphosed intracratonic McArthur Basin of northern Australia contains a dolomitic black shale facies that has distinctive millimetre and sub-millimetre scale bedding laminations and microcycles of alternating organic-rich mudstone and organic-poor dolostone as mentioned in this paper.

TL;DR: In this article, the modes of accumulation and distribution of terrestrial carbonates in semi-arid alluvial-fluvial, generally clastic sedimentary environments are investigated.

TL;DR: In this paper, a sequence of minerals common to all the different host-rock lithologies may be established: Fe silcretes, goethite, poorly hydrated Mn oxides and intensively hydrated modifications of manganomelane.

TL;DR: A high-resolution, seismic stratigraphic investigation of a portion of the central California continental shelf has demonstrated that depositional patterns and sequences are controlled largely by an interplay of glacio-eustatic sea-level fluctuations superimposed on local tectonics.

TL;DR: The St. Paul Group (Row Park and New Market Formations) of Maryland and southern Pennsylvania, a 200 m thick carbonate platform deposit as discussed by the authors, was used to determine the paleoclimate and depositional processes operating during formation of the limestones and dolostones of the lower Middle Ordovician St Paul Group.

TL;DR: The Feather Conglomerate is a body of subarkosic coarse sandstone and conglomerate, 200 m thick, part of the Victoria Group (Beacon Supergroup), in southern Victoria Land as mentioned in this paper.

TL;DR: In this article, trace element analyses of the cores indicate correlations between strontium and sodium concentrations and the particular carbonate phase and evidence of continuous formation of dolomite indicates that the process is actively occurring.

TL;DR: In this article, the lower Black Jack Formation was recognized as a major delta system in the Gunnedah Basin, a foredeep of the rising New England Fold Belt, and two principal depositional units were recognized in the lower black jack formation: the lower delta-plain facies and the shallow-marine facies.

TL;DR: In this article, a generalised model for the characteristic features of turbidites deposited between fair-weather wave-base and storm wave base is presented, and it is suggested that such turbidite will contain only occasional examples of reworking and that the frequency of such reworking events per stratigraphic interval might be used as a relative measure of water depth throughout a sequence.

TL;DR: In this paper, a model is presented to account for the transformation of erosional storm waves into constructional swash run-up by the filtering mechanism of the remnant supratidal terrace.

TL;DR: The Colombacci carbonates, known as Colombacci, of a terrestrial series deposited within an Upper Messinian basin in Marche, Italy, have been examined by means of stable isotope analyses, AAS analyses, study of thin-sections and SEM observations as discussed by the authors.

TL;DR: The coarse siliciclastic and volcaniclastic depositis of the Plio-Pleistocene Ashigara Group, as much as 4500 m thick, are distributed along a narrow belt which is assigned to the Quaternary collision boundary between the Izu Peninsula (Izu Block) and central Honshu.

TL;DR: In this paper, the authors compare the two tectono-stratigraphic units in the subduction complex, the Gundahl Complex and the Coffs Harbour sequence, to show the facies differences between the two units reflect slower subduction rates and higher sedimentation rates.

TL;DR: The possibility that diamictites of the Late Precambrian Bebedouro Formation of northern Bahia, Brazil, are glacial in origin has been based on the areal extent, diversity of the lithology of the stones and the presence of outsize dropstones in rhythmites as mentioned in this paper.