none 10.1144/gsjgs.151.2.0269 Geological Society of London Geological Society of London 1881 30779756 44798 2024111903224500840 10.1144 2024-11-19T07:26:54Z 2007-12-21T13:40:02Z 28 Journal of the Geological Society JGS 0016-7649 2041-479X 05 16 2007 03 1994 151 2 M. R. GIBLING Department of Earth Sciences, Dalhousie University, Halifax, Nova Scotia, Canada B3H 3J5 F. M. GRADSTEIN Atlantic Geoscience Centre, Bedford Institute of Oceanography, Dartmouth, Nova Scotia, Canada B2Y 4A2 I. L. KRISTIANSEN Norsk Hydro Research Centre, N-5020, Bergen, Norway J. NAGY Department of Geology, University of Oslo, PO Box 1047, Blindern, 0316 Oslo 3, Norway M. SARTI Dipartimento di Scienze della Terra, Universita della Calabria, 87030 Castiglione Cosentino Scalo, Italy J. WIEDMANN Istitut für Geologie und Paläontologie, Sigwartstrasse 10, 7400 Tübingen, Germany Early Cretaceous sandstones, shales and marlstones (Chukh, Tangbe and Muding Formations, at least 625 m thick) crop out north of the Main Central Thrust in central Nepal. They were strongly deformed during Himalayan collision, with telescoping of facies transitions as a result of crustal shortening. The sediments show northerly palaeoflow and were deposited on the steadily subsiding northern (Tethyan) margin of Gondwana. Berriasian deltaic deposits pass upward into Valanginian-Albian, storm-dominated shelf deposits and into latest Albian pelagic slope carbonates. An unconformity, probably of Valanginian age, separates the Chukh and Tangbe formations locally, and is overlain by volcanic conglomerates. The Gondwanan margin succession matches well with that observed on the formerly conjugate margin of NW Australia, which separated from Greater India during the Valanginian to Hauterivian. Volcanic detritus, where suitable for analysis, shows within-plate geochemical affinity and reflects Gondwanan fragmentation. Abundant volcanic detritus in Aptian strata may have been derived from extensions of the Rajmahal Traps of northeast India. However, volcanism was active near central Nepal in the Valanginian and volcanic detritus, possibly far travelled, reached the area during the Berriasian. Early Cretaceous strata1 successions and relative sea-level changes show a first-order relationship to tectonism associated with Gondwanan break-up. 06 06 2022 03 1994 269 290 10.1144/gsjgs.151.2.0269 1 10.1144/crossmark-policy www.lyellcollection.org true 1992-07-16 1993-07-20 2022-06-06 https://doi.org/10.15223/policy-002 10.1144/gsjgs.151.2.0269 https://www.lyellcollection.org/doi/10.1144/gsjgs.151.2.0269 https://www.lyellcollection.org/doi/pdf/10.1144/gsjgs.151.2.0269 https://geoscienceworld.org/jgs/article-lookup?doi=10.1144/gsjgs.151.2.0269 Geologie Alpine, Memoirs Arita K. 9 16 1991 Cretaceous alkaline magmatism in the Nepalese Lesser Himalayas Arita K., Sakai H., Koide Y.Cretaceous alkaline magmatism in the Nepalese Lesser HimalayasGeologie Alpine, Memoirs199116910 10.1029/JB091iB14p13803 10.1144/GSL.SP.1988.037.01.07 ALbel A.J. & Grigjalis A.A. 1991. Practical advisory in micropaleontology of the USSR. Vol. 5 Me.sozoic foraminifera . 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