Geologische Rundschau

, Volume 68, Issue 3, pp 876–893 | Cite as

Coccolithen-Diagenese in Malm-Kalken (Solnhofen/Frankenalb, Oberalm/Salzburg)

  • Erik Flügel
  • Helmut Keupp
Article

Zusammenfassung

Rasterelektronenmikroskopische Untersuchungen der Solnhofener Plattenkalke (Lagunensediment) und der Oberalmer Kalke (bathyale Sedimente) zeigen weitgehend ähnliche diagenetische Veränderungen der Coccolithen-Morphologie. Die Vielfalt der während der Sedimentation, am Meersboden und im Sediment möglichen Lösungs- und Abscheidungsvorgänge (siehe Abb. 1) erscheinen in den beiden, aus unterschiedlichen paläogeographischen Bereichen stammenden Malm-Kalken homogenisiert.

Abstract

According to Stereoscan Electron Microscope Studies of the Upper Jurassic (Tithonian) Solnhofen limestone (Southern Franconia) and of the Oberalm limestone (Northern Calcareous Alps) similar diagenetic criteria can be recognized in the alterations of the coccolith morphology. In contrast to the various solution- and precipitation patterns formed during the sedimentation of the ultraplancton, on the sea-floor or in the sediment (see fig. 1) no differentiation can be made with regard to the submicroscopic criteria caused by diagenetic processes in different environments (Solnhofen: subtidal lagoon with alternating hypersaline conditions with growth of blue-green-algal mats and normal marine water conditions with the sedimentation of ultraplancton. — Oberalm: bathyal basin with strongly burrowed soft bottoms and common sedimentation of ultraplancton).

Résumé

Les études par S.E.M. des calcaires en minces bancs de Solenhofen (sédiment lagunaire) et des calcaires d'Oberalm (sédiment bathyal) montrent des transformations diagénétiques sensiblement les mÊmes dans la morphologie des coccolithes. La multiplicité des processus de dissolution et de précipitation pouvant intervenir au cours de la sédimentation sur le fond de la mer et dans le sédiment, apparaissent comme s'homogénéisant dans ces deux calcaires du Mahn provenant de domaines paléogéographiques différents.

кРАткОЕ сОДЕРжАНИЕ

пРИ ИсслЕДОВАНИИ сОл ьНгОФскИх слОИстых И жВЕстНькОВ (лАгУННАь ОсАДОЧНАь п ОРОДА) И ВЕРхНЕАльМскИх ИжВЕ стНькОВ (глУБОкОВОДН ыЕ ИжВЕстНькИ) с пОМОЩьУ ЁлЕктРОННОИ МИкРОск ОпИИ УстАНОВИлИ жНАЧИтЕл ьНыЕ схОДстВА ДИАгЕН ЕтИЧЕскИх ИжМЕНЕНИИ стРОЕНИь к ОккОлИтОВ. НЕсМОтРь НА МНОгООБР АжИЕ ВОжМОжНых пРОцЕ ссОВ РАстВОРЕНИь И ВыпАДЕ НИь (РИс. 1) ВО ВРЕМь ОсАДкОНАкОп лЕНИь НА ДНЕ МОРь И В сА МОМ сЕДИМЕНтЕ, ЁтИ ИжВЕст НькИ, ВжьтыЕ Иж РАжлИЧНых пАлЕОгЕОг РАФИЧЕскИх ОБлАстЕИ, с пОМОЩьУ ДАННОгО МЕтОДА НЕ РЕж лИЧАУтсь И кАжУтсь гОМОгЕННыМ И.

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Copyright information

© Ferdinand Enke Verlag Stuttgart 1979

Authors and Affiliations

  • Erik Flügel
    • 1
  • Helmut Keupp
    • 1
  1. 1.Institut für PaläontologieUniversität Erlangen-NürnbergErlangen

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