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Clays and Clay Minerals

, Volume 21, Issue 4, pp 207–212 | Cite as

Regularly Interstratified Chlorite—Dioctahedral Smectite in Dike-Intruded Shales, Montana

  • C. L. Blatter
  • H. E. Roberson
  • G. R. Thompson
Article

Abstract

Corrensite or ‘corrensite-like’ minerals occur in dike-intruded shales and siltstones of the Montana Group and Colorado Group (Early Cretaceous) in Western Montana. The < 1 µm size fraction of one specimen of this “corrensite-like” material has been studied in detail. X-ray diffraction data and chemical analysis indicate that this specimen is a regular or nearly regular interstratification of chlorite and dioctahedral smectite. Also described are other samples, which contain corrensite and additional phases. These samples were taken at several localities where basic dikes have intruded these shales and siltstones.

Résumé

La corrensite ou les minéraux ‘du type corrensite’ se rencontrent dans des schistes et des siltstones traversés par des dikes, dans le Groupe du Montana et le Groupe du Colorado (crétacé inférieur), du Montana de l’Ouest. La fraction < 1 µm d’un échantillon de ce matériau ‘du type corrensite’ a été étudiée en détail. La diffraction des rayons X et l’analyse chimique indiquent que cet échantillon est un interstratifié régulier ou presque régulier de chlorite et de smectite dioctaédrique. On décrit aussi d’autres échantillons qui contiennent de la corrensite et des phases additionnelles. Ces échantillons ont été prélevés dans plusieurs localités où des dikes basiques traversent les schistes et les siltstones.

Kurzreferat

Corrensit oder ‘Corrensit-ähnliche’ Minerale kommen in adernführenden Schiefertonen und Schluffgesteinen der Montana- und Colorado-Gruppe (Unterkreide) im westlichen Montana vor. Die Korngrößenfraktion < 1 µm einer Probe dieses “Corrensit-ähnlichen” Materials wurde im einzelnen untersucht. Röntgenbeugungswerte und chemische Analyse zeigen, daß diese Probe eine regelmäßige oder nahezu regelmäßige Wechsellagerung von Clorit und dioktaedrischem Smectit aufweist. Andere Proben, die Corrensit und zusätzliche Phasen enthalten, werden ebenfalls beschrieben. Diese Proben wurden an verschiedensen Stellen entnommen, wo basische Adern in die Schiefertone und Schluffgesteine eingedrungen sind.

Резюме

Корренсит или корренситообразные минералы залегают в глинистом сланце с внедренными дайками и в алеврите групп Монтана и Колорадо (ранний меловой период) в Западной Монтане. Детально изучалась фракция образца размером < 1 µM этого корренсито-образного материала. Рентгенографические данные и химический анализ показывают, что этот образец является регулярным или почти что регулярным впластованием хлоритного и диоктаэдралъного смектита. Также описываются другие образцы содержащие корренсит и добавочные разновидности. Эти образцы собрали в разных местонахождениях, где основные дайки внедрились в глинистые сланцы и алевриты.

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Copyright information

© Clay Minerals Society 1973

Authors and Affiliations

  • C. L. Blatter
    • 1
  • H. E. Roberson
    • 1
  • G. R. Thompson
    • 2
  1. 1.Department of GeologyState University of New York at BinghamtonNew YorkU.S.A.
  2. 2.Department of GeologyUniversity of MontanaMissoulaU.S.A.

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