Coated Grains by Tadeusz M. Peryt (auth.), Dr. Tadeusz M. Peryt (eds.)

By Tadeusz M. Peryt (auth.), Dr. Tadeusz M. Peryt (eds.)

Coated grains have consistently attracted consciousness, at the beginning of naturalists, and later of geologists, and the curiosity in those unusual our bodies was once re­ lated either to their exciting shape and their importance in facies inter­ pretation and sedimentology and to their relevance to accumulations of hydrocarbons and different mineral deposits. This led to various guides in this topic, and the goal of this quantity is to sum­ marize the current nation of information on lined grains. the belief of the e-book was once to unite a few basic papers with papers reporting case reviews of either fresh and historic lined grains. The association of the booklet follows this purpose. The papers provided during this quantity were invited through the editor; the topic of the publication benefits a couple of phrases of non-public heritage. the advance of experiences of covered grains over the past twenty years has not just ended in a superb bring up in wisdom of modern and historic environments of lined grain formation, but additionally various very important and arguable questions of category, environmental value, mineralogical composition and so forth. of historical covered grains have arisen. to respond to those questions, in 1978 i began the learn of many old and up to date occurrences of covered grains on the Institut fUr Geologie, Ruhr-UniversiUH Bochum, following the invitation of Hans Fiichtbauer and subsidized through the Alexander von Humboldt-Stiftung.

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Abstr Geol Soc Can Annu Meet, Calgary, p A-33 Land LS (1980) The isotopic and trace element geochemistry of dolomite: the state of the art. SEPM Spec Publ 28:87 - 110 Land LS, Hoops GK (1973) Sodium in carbonate sediments and rocks: a possible index to the salinity of diagenetic solutions. J Sediment Petrol 43:614 - 617 Land LS, Behrens EW, Frishman SA (1979) The ooids of Baffin Bay, Texas. J Sediment Petrol 49:1269-1278 Loreau J-P (1982) Sediments aragonitiques et leur genese. Memoires du Museum National d'Histoire Naturelle, Serie C, 47, 312 pp Loreau J-P, Purser BH (1973) Distribution and ultrastructure of Holocene ooids in the Persian Gulf.

36 M. Magaritz References Behrens EW, Frishman SA (1971) Stable carbon isotope in blue green algal mats. J GeoI79:94-100 Campos HS, Hallam A (1979) Diagenesis of English Lower Jurassic limestones as inferred from oxygen and carbon isotope analysis. Earth Planet Sci Lett 45:23 - 31 Choquette PW (1968) Marine diagenesis of shallow marine lime-mud sediments: insights from 0 180 and 013C data. Science 161:1130-1132 Cloud Jr PE (1962) Environment of calcium carbonate deposition west of Andros Island, Bahams.

1 Isotope Exchange Problem The differences in isotopic composition between the various coated grains found in the recent environment could not apply directly without coation in the study of M. Magaritz 32 ancient samples. In processes such transformations from unstable minerals like aragonite and Mg-calcite (which characterize coated grains from the marine environment) to more stable low Mg-calcite isotopic exchange with the diagenetic solution may take place. Other late processes like recrystallization, crystal growth and late cementation also may cause isotopic changes in the rock.

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