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Clays and Clay Minerals

, Volume 30, Issue 4, pp 275–280 | Cite as

Smectite in Marine Quick-Clays of Japan

  • Kazuhiko Egashira
  • Masami Ohtsubo
Article

Abstract

Clayey sediments of marine origin having sensitivities (ratio of undisturbed to remolded shear strength) as high as 1000 at a reduced salt concentration are found around Ariake Bay, Kyushu, Japan. The clay fraction of the sediments contains smectite as a principal mineral (33–42%) in contrast to the illitic composition of most previously described quick-clays. However, this smectite is a low-swelling type, and the Na-form expands only to about the same extent as the Ca-form and gives a sediment volume almost equal to that of the Ca-clay. This low-swelling smectite appears to consist of packets of unit layers even after saturation with Na, and thus reacts like the kaolinite or illite of conventional quick-clays.

Key Words

Japan Marine Quick-clay Smectite Swelling 

Резюме

Глиняные осадки морского происхождения, имеющие чувствительности (отношение несмущенной и смущенной прочностей при срезе) такие большие как 1000 при уменьшенной концентрации соли, находятся в районе бухты Ариаке, Кыусху, Япония. Глинистая фракция осадков содержит смектит как основной минерал 33-42%) в противоположность к иллитовому составу большинства ранее описанных зыбучих глин. Однако, этот смектит является мало-набухающего типа, и Nа-форма расширяется только до примерно такого же самого уровня как Са-форма и приводит к почти равному объему осадков как и Са-глина. Кажется, что этот мало-набухающий смектит состоит из пакетов элементарных слоев даже после насыщения натрием, и тогда он реагирует как каолинит либо иллит обычных зыбучих глин. [Е.С.]

Résumé

Des sédiments argileux d’origine marine ayant des sensitivités (proportion de la force non dérangée à la force remoulée) atteignant 1000 à une concentration de sel réduite sont trouvés autour de la Baie Ariake, Kyushu, Japon. La fraction argile des sédiments contient de la smectite comme minéral principal (33–42%) contrairement à la composition illitique de la plupart des argiles rapides décrits précédemment. Cette smectite est cependant du type à bas gonflement, et la forme-Na s’épand seulement approximativement autant que la forme-Ca et donne un volume de sédiment presqu’égal à celui de l’argile-Ca. Cette smectite à bas gonflement semble consister de paquets de couches unitaires même après avoir été saturée de Na, et par conséquent elle réagit comme la kaolinite ou l’illite d’argiles rapides conventionnels. [D.J.]

Resümee

Tonige Sedimente mariner Entstehung, die bei reduzierter Salzkonzentration Sensitivitäten (Verhältnis der ungestöten zur Scherfestigkeit der durchkneteten Probe) von etwa 1000 haben, wurden um die Ariake Bay, Kyushu, Japan, gefunden. Die Tonfraktion der Sedimente enthält Smektit als häufigstes Mineral (33–42%) im Gegensatz zur illitischen Zusammensetzung der meisten früher beschriebenen Quick-tone. Dieser Smektit quillt jedoch nur wenig, und die Na-Form quillt etwa nur so viel wie die Ca-Form und ergibt ein Sedimentvolumen, das dem von Ca-Tonen entspricht. Dieser schlechtquellende Smektit scheint aus Paketen von Einzellagen zu bestehen, sogar nach der Sättigung mit Na, und verhält sich daher wie der Kaolinit oder Illit von herkömmlichen Quicktonen. [U.W.]

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Copyright information

© The Clay Minerals Society 1982

Authors and Affiliations

  • Kazuhiko Egashira
    • 1
  • Masami Ohtsubo
    • 1
  1. 1.Faculty of AgricultureKyushu University 46FukuokaJapan

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