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Facies importance

Biuce the original descilption by T.innttua was published,. several apecies have been described which hod the genem-1 facies of his trije hub differed iii some important characiera,... [Pg.379]

Although the majority of attention in discussions on the origins of BIFs has been on the oxide facies, siderite facies rocks are equally important in many BIF sequences. Reaction of Fe(II)aq and dissolved carbonate with hematite to form siderite and magnetite has been hypothesized to be an important diagenetic process in marine basins during formation of some BIFs if sulfate contents were low (e.g., Klein and Beukes 1989 Beukes et al. 1990 Kaufman 1996 Sumner 1997). In Figure 18 we assume that Fe(II)aq was derived either from MOR sources or DIR, or a combination of the two, which reacted with ferric oxide precipitates to form magnetite or dissolved carbonate to produce siderite. [Pg.396]

One might conclude by saying that the role of montmorillonites in low temperature clay mineral facies is very important. There are, however, several points to clear up, mainly those dealing with the origin of the expanding material, before a complete geochemical cycle can be devised... [Pg.67]

This has been confirmed in the present study for chlorites from six rocks from the Belt series in northern Montana (Harrison and Jobin, 1963) and three samples from the outer zones in the Alpine chain. From these analyses, it is apparent that metamorphic chlorites which have crystallized with muscovite have low silica contents and a rather limited alumina content (27 3% A1 ions). The relatively large variation in chlorite Fe-Mg ratio from rock to rock suggests that bulk rock composition is more important in determining the chlorite composition than is the case of chlorites from clay mineral facies. [Pg.111]

Temperature is also of great importance, apparently decreasing the Si-content of the zeolites as it increases. Temperature and time, or approach to equilibrium, appear to determine the type of zeolite assemblages found and thus an understanding of these factors permits the tentative establishment of two alkali zeolite "facies" subdivisions the diagenetic and analcite type (Hay, 1966 Moiola, 1970 Iijima and Utada, 1970 Iijima, 1970 Studer, 1967 Coombs, 1970 Seki, 1969 Miyashiro and Shido, 1970). [Pg.122]

Carbon Dioxide and Related Molecules.—It is not surprising that so unconventional a molecule as carbon monoxide should have a resonating structure but recognition of the faci, that the carbon dioxide molecule, for which the valence-bond formula 0—C---0 has been written ever since the development of valence theory, is not well represented by this structure alone and that other valence-bond structures also make important contributions must have come as a surprise to everyone. [Pg.267]

Peter A. Hacquebard It is interesting to note that material evaluations rather than microscopic analyses of the natural bands (microlithotypes) are used in this study. In so doing, the natural stratigraphic sequence within the coal bed is not considered. For geological studies the latter is of great importance, permitting correlation of coal seams and studies of facies changes. [Pg.85]

Donald R. Baker. It seems to me that your results on the distribution of boron and gallium have important implications for the work of others who have concluded that these elements are depositional environmental indications. I wonder if the enrichment of these elements in nonmarine rocks of Pennsylvanian age in the eastern U.S. may simply reflect their proximity to the source area and not have any real bearing on the depositional environment. And conversely, the lower content of these elements reported for marine shales may be caused by deposition of these facies in areas far removed from the source areas. What is your opinion ... [Pg.248]

At the outset, it is important that we appreciate that any unexpected results that the applicant hopes to rely on in rebutting a prima facie case of obviousness need to be explicitly disclosed or at least inherently flow from a described feature of the invention. This means that one cannot expect to overcome a rejection based on alleged obviousness by demonstrating unexpected properties that were not disclosed in the patent application as filed or do not flow naturally (inherently) from the disclosure in the application. [Pg.227]

As we just learned, combining compounds or materials known in the art to be useful singly for the same purpose can be prima facie obvious. It is also instructive to consider the situation that occurs where one equivalent material or compound is substituted for another in a composition or process. In this context, it is important to not focus solely on the actual equivalence of the material being substituted but also to focus on whether one of ordinary skill in the art would appreciate this equivalency. These points are addressed in the case of Smith v. Hayashi, arising from an interference... [Pg.272]

Of greater importance are findings of the Templomhegy-Lo wer Biharian microfauna in a number of localities from regional sediments which, in contrast with thegrassland-steppe aspect of the Villany and the forest facies of the Biikk material, represent pronouncedly aquatic, riparian aspect. [Pg.65]


See other pages where Facies importance is mentioned: [Pg.265]    [Pg.1100]    [Pg.48]    [Pg.60]    [Pg.325]    [Pg.374]    [Pg.291]    [Pg.41]    [Pg.46]    [Pg.48]    [Pg.48]    [Pg.383]    [Pg.224]    [Pg.157]    [Pg.157]    [Pg.169]    [Pg.108]    [Pg.360]    [Pg.126]    [Pg.100]    [Pg.182]    [Pg.77]    [Pg.204]    [Pg.86]    [Pg.473]    [Pg.101]    [Pg.19]    [Pg.91]    [Pg.561]    [Pg.209]    [Pg.240]    [Pg.243]    [Pg.252]    [Pg.265]    [Pg.165]    [Pg.108]    [Pg.158]    [Pg.34]    [Pg.137]    [Pg.77]   
See also in sourсe #XX -- [ Pg.48 ]




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