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Archean seismites of the Ventersdorp Supergroup, South Africa

Department of Geology, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa, email: easc{at}rau.ac.za

H. N. Bhattacharya

Department of Geology, Presidency College, Calcutta 700073, India, email: acecopc{at}giasc101.vsnl.net.in

U. Zimmermann

Department of Geology, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa, email: uz{at}rau.ac.za

J. Gutzmer

Department of Geology, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa, email: jg{at}rau.ac.za

This contribution documents the discovery of seismites in pyroclastic lithologies of the Kameeldoorns Formation of the late Archean (2.8 to 2.65 Ga) Ventersdorp Supergroup, South Africa. A variety of well-preserved sedimentary structures document the seismites, comprising syn-sedimentary faults, convolute bedding, graben-like down-sagging structures, syn-sedimentary breccias and syneresis cracks. Earthquakes associated with syn-sedimentary faulting and intrabasinal volcanic activity that affected the unconsolidated sediments of the Kameeldoorns Formation explain the origin of these structures.