摘要:

A descriptive classification of cross‐stratified units is proposed based on six objective criteria, and diagnoses are given for fifteen distinct kinds of cross‐stratified unit recognised with their aid. The origin of each kind is discussed in the light of existing observational, experimental, and theoretical studies. A three‐fold genetic classification of cross‐stratified units is tentatively outlined in which apparent origin and physical properties are closely cor

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1963.tb01204.x

出版商:Blackwell Publishing Ltd    

年代:1963

数据来源: WILEY

摘要:

A series of quasi‐quantitative experiments on delta building were carried out in a laboratory flume for the purpose of studying the mechanics of deposition of topsets, foresets, and bottomsets. The genesis of these sets can be rationally explained through the discipline of sediment transport mechanics by taking cognizance of (a) the hydraulic phenomena of gradually varied and rapidly varied flow, (6) the concept of aggradation to a profile of equilibrium. The geometry of a delta front is controlled by the dynamics of the environment of deposition, and the frontal profile can be inter‐ preted as a function of the micro‐mechanics of particle movement in the transition zone where the stream enters the basin of depos

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1963.tb01205.x

出版商:Blackwell Publishing Ltd    

年代:1963

数据来源: WILEY

摘要:

Salt marsh deposits are developed along many tidal flat areas, lagoons, bays, etc. They are characterized by small thickness, special sedimentary structures, high organic content, growth of phanerogamous halophytes, and often by scarcity or absence of microfauna. A graphical representation of a section at Ameland (The Netherlands) is given, as well as radiographs of a sandy (Ameland) and a clayey (California) marsh sample. Little structural difference exists between the two.

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1963.tb01206.x

出版商:Blackwell Publishing Ltd    

年代:1963

数据来源: WILEY

摘要:

This study in Breton, Chandeleur, and Mississippi Sounds combines the use of bottom‐penetrating acoustic‐reflection records with lithologic descriptions of piston and gravity cores for construction of sections showing boundaries of depositional facies units. Continuous acoustic records delineate morphology of buried horizons (lithologic breaks, changes in density, water content, or degree of lithification). Lithologic descriptions give internal structure and variations of particle size, color, components such as shells and wood fragments, and consistency. With these criteria, deposits were divided into the major broad facies units ofsound deposits, delta deposits, basal and barrier island sandsandPleistocene clays. Delta deposits are recognized as being of two distinct periods of the St. Bernard subdelta, which has subsided beneath Breton and Chandeleur Sounds.Probable buried distributaries of these delta phases are recognized in the records. Sand bodies connecting islands in Mississippi Sound are suggested as remnants of an extensive barrier island which fronted the area previous to the subdelta growth and had its beginnings about 7,000 B

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1963.tb01207.x

出版商:Blackwell Publishing Ltd    

年代:1963

数据来源: WILEY

摘要:

Sediments cored to a depth of about 1 m in Bay St. George, Newfoundland, were examined for grain‐size distribution and minerals. The sediments are light brown silty clays, the principal minerals of which are chlorite and muscovite mica. The scarce sand consists of fresh detrital grains of blue‐green amphibole, biotite, epidote, zoisite, magnetite, garnet, hypersthene, apatite, chlorite, and scarce zircon. Quartz, plagioclase feldspar, and muscovite are abundant. These minerals are all present in the rocks of the adjacent land areas and have been deposited in the sediments with little alteration or change due to weathering. The clay minerals of the sediments are predominantly muscovite and chlorite with a slight admixture of vermiculite and montmorillonite. There is very little mixed‐layering of these minerals. Montmorillonite may be due to diagenetic changes after deposition of these clays in the marine environment of th

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1963.tb01208.x

出版商:Blackwell Publishing Ltd    

年代:1963

数据来源: WILEY

摘要:

Three methods, (a)dessication, (b)gas extraction and (c)immiscible‐liquid extraction, are described and evaluated for removing interstitial water from coarse‐grained sedi‐ ments for semi‐quantitative and quantitative chemical analyses. The dessication method is useful for chlorinity or chlorosity determinations and (with a correction of 5%) gives results probably accurate to within about ± 2O% Extraction of interstitial water with gas of high relative humidity gives results which are correct to within an error of ± l.O% The chlorosity of interstitial water extracted by forcing a high‐ viscosity epoxy plasticizer (immiscible with water) through the sediment falls within about ± 0.1% of the correct value. The immiscible‐extraction method is therefore recommended for work requiring quantitative knowledge of interstitial w

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1963.tb01209.x

出版商:Blackwell Publishing Ltd    

年代:1963

数据来源: WILEY

摘要:

A staining technique is described which detects variations in ferrous iron content within calcite and dolomite, whilst simultaneously differentiating the dolomite from the calcite. The application of this technique to a study of dedolomitisation is pre‐ sented.Ferroan dolomite, in certain pyrite bearing limestones of the southern Jura, is shown to have been dedolomitised, that is replaced by calcite, while at the same time the pyrite content of the rock was oxidised to haematite. One of the oxidation products of the pyrite is considered to have caused the dedolomitisatio

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1963.tb01210.x

出版商:Blackwell Publishing Ltd    

年代:1963

数据来源: WILEY

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1963.tb01211.x

出版商:Blackwell Publishing Ltd    

年代:1963

数据来源: WILEY