ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1968.tb01100.x

出版商:Blackwell Publishing Ltd    

年代:1968

数据来源: WILEY

摘要:

SUMMARYIndices based on Wentworth phi values ofQ1,MdandQ3are used for textural classification of sediments. Wentworth phi values enable a detailed subdivision. A nomenclature based on the Wentworth phi indices is developed. The indices, and to a smaller degree the names, show sorting and skewness based on integer phi units. The classification scheme gives a continuous scale from gravel to fine clay. TheQ1MdQ3‐indices can be used for distinction of river, marine and loess deposits. The addition of indices of the 1st and 99th percentile, giving 5‐digit indices, augments the possibilities for a determination of the environment: river deposits can be distinguished from beach and dune sediments and in more detail from shallow marine and coastal deposits. The indices can be handled by data‐processing mac

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1968.tb01101.x

出版商:Blackwell Publishing Ltd    

年代:1968

数据来源: WILEY

摘要:

SUMMARYA simple experiment demonstrates that shape and bulk density of bioclastic carbonate crains are important factors affecting the grain‐size distribution of a clastic carbonate sediment deposited in wate

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1968.tb01102.x

出版商:Blackwell Publishing Ltd    

年代:1968

数据来源: WILEY

摘要:

SUMMARYCurved or planar discordant surfaces occurring within a limited stratigraphic range immediately beneath shallow marine deposits represent penecontemporaneous shear surfaces along which slumps have moved. Rotated packets of strata frequently retained within the curved discordant surfaces show both internal and external evidence of having moved laterally. Movement is considered to have been triggered off by a sudden shock or shocks which may have been either of sedimentary or tectonic origin. The slumping occurred at the change in gradient between slope and shallow marine shelf deposits.

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1968.tb01103.x

出版商:Blackwell Publishing Ltd    

年代:1968

数据来源: WILEY

摘要:

SUMMARYThe quantitative relationships between stratigraphical variables from a succession of coal‐bearing cycles deposited in a subsiding basin have been investigated using principal component‐ and factor analysis, in an attempt to reveal simple relationships undetected by conventional qualitative methods. Knowledge of such relationships will undoubtedly be useful in future computer simulation studies of cyclical sedimentation. Principal component analysis and factor analysis yield similar results, which confirm and amplify those of the trend surface analysis described in Readand Dean(19

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1968.tb01104.x

出版商:Blackwell Publishing Ltd    

年代:1968

数据来源: WILEY

摘要:

SUMMARYOn the crystallinity of illite in diagenesis and anchimetamorphismA simple method to estimate the degree of “crystallinity” of illite has been used for several years in three French laboratories. Many results, which are unpublished, were obtained; three examples are presented in this paper. They show the sensibility of the method, which allows one to appreciate, above all other methods, burial diagenesis, the front of metamorphism, or some regional areas of very weak metamorph

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1968.tb01105.x

出版商:Blackwell Publishing Ltd    

年代:1968

数据来源: WILEY

摘要:

SUMMARYIn a discussion Kalsbeek(1967) suggests that my idea of an authigenic origin of zircons seems to be the result of mis‐identification of authigenic titaniferous minerals as zircon. Kalsbeek appears to have formed this opinion firstly because he seesallthe crystals (Saxena, 1966a, plate IV) as zircons. I never mentioned this. Since 70% of the matrix in the sandstones consists of such aggregate, the very idea of having so much zircon in the rock would be fantastic and absur

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1968.tb01106.x

出版商:Blackwell Publishing Ltd    

年代:1968

数据来源: WILEY

摘要:

SUMMARYThe observed size in the thin‐section is less than the true grain sizes of the clastic rock as the thin‐section plane does not necessarily pass through the centre of gravity of the grains. Correction factors based on probability theory give corrected arithmetic moments of the size distribution in the clastic rock from the observed arithmetic moments of the size distribution in the thin‐section. The corrected arithmetic moments so obtained are transformed to their equivalent corrected phi moments which are useful to generate the unknown size distribution of the clastic rock by the help of Edgeworth's s

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1968.tb01107.x

出版商:Blackwell Publishing Ltd    

年代:1968

数据来源: WILEY

摘要:

Books review in this article:Diagenesis in Sediments—Developments in Sedimentology 8.G. Larsenand G. V. Chilingar(Editors)Die Mikromorphornetrische Analyse. W. L. KUBIENA (Editor).Atomic Absorption Spectrometry in Geology. E. E. ANGINO and G. K. BILLINGSConcise Eizcyclopuedic Dictionary of Applied Geology, Mining and Civil Engineering. A. NP, LSON and K. D. NELSO

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1968.tb01108.x

出版商:Blackwell Publishing Ltd    

年代:1968

数据来源: WILEY

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1968.tb01109.x

出版商:Blackwell Publishing Ltd    

年代:1968

数据来源: WILEY