Geologische Rundschau

, Volume 68, Issue 1, pp 302–317 | Cite as

The influence of late Quaternary stagnations on clay sedimentation in the eastern Mediterranean sea

  • Janusz Dominik
  • Peter Stoffers
Aufsätze

Abstract

Late Quaternary sapropels of the eastern Mediterranean differ from normal sediments in their clay mineral composition. Clay minerals in the sapropels studied here are only slightly affected, or are not affected at all by diagenetic alteration. This permits the observation of primary differences. During stagnation periods, the contribution of remote or accessory sources was reduced or even absent. Different circulation patterns and, particularly, a general decline in deeper water currents activity might be held responsible for the observed differences in the clay mineral composition of sapropels and normal sediments.

Keywords

Clay Mineral Avant Circulation Pattern Water Current Primary Difference 

Zusammenfassung

Die quartären Sapropele des östlichen Mittelmeeres unterscheiden sich von den normal marinen Sedimenten in ihrer Tonmineralzusammensetzung. Die hier untersuchten Tone der Sapropele zeigen nur geringe oder gar keine diagenetischen Veränderungen. Diese Tatsache erlaubt, Rückschlüsse auf primäre Unterschiede zu ziehen. Während der Stagnationsperioden war die Zufuhr von Tonen aus entfernten oder weniger wichtigen Liefergebieten stark vermindert. Unterschiedliche Zirkulation, besonders eine geringere Aktivität der Tiefenströmungen, scheinen die Ursache für die beobachteten Unterschiede in der Tonmineralzusammensetzung zwischen Sapropel- und normal-marinen Sedimenten

Résumé

Les sapropels quaternaires de la Méditerranée orientale se distinguent des vases communes par la composition des minéraux argileux. Les argiles des sapropels examinés sont peu affectés par l'altération diagénétique, ce qui permet l'observation de différences primaires.

On a conclu, que pendant les périodes de stagnation, la contribution des argiles provenant des sources éloignées ou secondaires, a été réduite ou même interrompue. Différentes conditions de circulation et, avant tout, la réduction d'activité des courants profonds, sont probablement responsables des différences observées dans la composition des minéraux argilezx des sapropels et des vases communes.

Краткое содержание

Четвертичные сапроп ели восточной части С редиземного моря отличаются по со ставу их глиничтых минерал ов от обычных морских осадочных пород. Исследованные здесь глины сапропелей не п роявляют никаких диа генетически изменений, или же эти п оследние чрезвычайно незначи тельны. Во время засто я принос глин из отдаленных, ил и побочных зон сноса значительн о сократился. Различи е циркуляции и, в особен ности, незначительна я активность глуюинны х течений, кажется, явл яются причинами наблюдаем ых различий в составе глинистых м инералов сапропелев ых осадков и обычных морских осад кой.

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Copyright information

© Ferdinand Enke Verlag Stuttgart 1979

Authors and Affiliations

  • Janusz Dominik
    • 1
  • Peter Stoffers
    • 1
  1. 1.Institut für SedimentforschungUniversität HeidelbergHeidelberg 1

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