Geologische Rundschau

, Volume 76, Issue 2, pp 477–484 | Cite as

Lithostratigraphic correlation of Blaini Formation (late Proterozoic, Lesser Himalaya, India) with other late Proterozoic tillite sequences

  • M. E. Brookfield
Article

Abstract

The Blaini Formation of the Lesser Himalaya has long been considered Permo-Carboniferous in age on simple lithological correlation with Gondwana Tillites in southern India. Rare, and non-repeatable finds of fossils from the type area were thought to confirm this. Recently, Lower Cambrian faunas have been recorded from the overlying Tal and Krol Formations, and possible metazoan trails recorded from the Blaini itself. In addition, the Blaini Formation is, even on a lithostratigraphic comparison, much more like other late Proterozoic glacial sequences. The term Blaini Formation should only be used for rocks of the type area — not for widely scattered glacial deposits which may or may not be correlatable with the type section. The persistent belief in the Paleozoic age of the Blaini (and adjacent formations) has for long retarded unterstanding of Lesser Himalaya stratigraphy and tectonics.

Keywords

Cambrian Gondwana Lower Cambrian Type Section Type Area 

Zusammenfassung

Die Blaini Formation des Niederen Himalaya wurde bisher aufgrund lithologischer Vergleiche mit Gondwana Tilliten aus Süd-Indien in das Permo-Karbon eingestuft. Seltene, nicht wiederholbare Fossilfunde schienen dieses zu bestätigen. Kürzlich wurden Faunen des Unterkambriums in den überlagernden Tal- und Krol-Formationen gefunden sowie vermutliche Metazoanspuren aus der Blaini Formation selbst. Darüberhinaus ist die Blaini Formation sogar über den lithostratigraphischen Vergleich eher mit spätproterozoischen Glazialfolgen zu vergleichen. Der Begriff Blaini Formation sollte nur für die Typlokalität verwendet werden, und nicht für ähnliche Glazialvorkommen in der weiteren Umgebung. Die fortdauernde Annahme des paläozoischen Alters der Blaini- und umgebenden Formationen hat über lange Zeit hinweg das Verständnis für die Stratigraphie und die tektonische Entwicklung des Niederen Himalayas behindert.

Résumé

La formation de Blaini, dans l'Himalaya inférieur, a été jusqu'ici placée dans le Permo-Carbonifère sur la base de ses analogies lithologiques avec les tillites gondwaniennes du Sud de l'Inde. Cette attribution a semblé pouvoir Être confirmée par la découverte de quelques fossiles rares et isolés. Récemment des faunes du Cambrien inférieur ont été identifiées dans les formations surincombantes de Tal et de Krol; dans la formation de Blaini elle-mÊme des traces possibles de métazoaires ont été relevées. De plus, au seul point de vue lithologique, c'est avec les séries glaciaires du ProtérozoÏque supérieur que la formation de Blaini présente le plus de similitude. L'emploi du terme »Formation de Blaini« doit Être restreint à sa localité-type et doit Être évité pour des formations glaciaires d'autres régions, qui peuvent Être d'âges divers. L'âge paléozoÏque, attribué régulièrement jusqu'ici à la formation de Blaini et aux formations adjacentes a constitué un obstacle permanent à une bonne compréhension stratigraphique et tectonique de l'Himalaya inférieur.

кРАткОЕ сОДЕРжАНИЕ

ДО сИх пОР, НА ОсНОВАНИ И лИтОлОгИЧЕскИх сРА ВНЕНИИ с тИллИтАМИ гОНДВАНы УжНОИ ИНДИИ ФОРМАцИУ Blaini В НИжНИх гИМАлАьх От НОсИлИ к пЕРМОкАРБОН У. РЕДкИЕ, НЕ пОВтОРьУЩИ Есь НАхОДкИ ФОссИлИИ, кАжАлОсь, пОДтВЕРжДА лИ ЁтО. НЕДАВНО В пОкРы ВАУЩИх ФОРМАцИьх Tal И Krol УстАНОВ ИлИ НИжНЕкЕМБРИИскУ У ФАУНУ, А В ФОРМАцИИ Blaini — О тМЕтИлИ ВЕРОьтНыЕ слЕДы МНОг ОклЕтОЧНых. кРОМЕ тОг О, лИтОстРАтИгРАФИЧЕс кИЕ сРАВНЕНИь ОткРылИ сх ОДстВА с пОжДНЕпРОтЕРОжОИск ИМИ лЕДНИкОВыМИ ОтлО жЕНИьМИ. пОНьтИЕ «ФОРМАцИь Blaini» слЕДУЕт пРИМЕНьть тОлькО Дль хАРАктЕРИ стИкИ лОкАльНОгО тИп А сВИт, А НЕ Дль пОхОжИх лЕДНИк ОВых ОтлОжЕНИИ, ОтМЕЧ ЕНых пО сОсЕДстВУ. тОт ФАкт, ЧтО ФОРМАцИУ Blaini И ЕЕ ОкРУжЕНИЕ ДОлгОЕ ВРЕ Мь сЧИтАлИ пАлЕОжОИс кОгО ВОжРАстА, пРЕпьтстВО ВАлО пРАВИльНОИ ИНтЕ РпРЕтАцИИ стРАтИгРАФИИ И тЕктО НИЧЕскОгО РАжВИтИь Н ИжНИх гИМАлАЕВ.

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Copyright information

© Ferdinand Enke Verlag Stuttgart 1987

Authors and Affiliations

  • M. E. Brookfield
    • 1
  1. 1.Department of Land Resource ScienceGuelph UniversityGuelphCanada

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