STRATIGRAPHY OF THE CHIKKIM AND FATU LA FORMATIONS IN THE ZANGLA AND ZUMLUNG UNITS (ZANSKAR RANGE, INDIA) WITH COMPARISONS TO THE THAKKHOLA REGION (CENTRAL NEPAL) : MID-CRETACEOUS EVOLUTION OF THE INDIAN PASSIVE MARGIN ...

• Main Authors: PREMOLI SILVA, ISABELLA, GARZANTI, EDUARDO, GAETANI, MAURZIO
• Format: Article in Journal/Newspaper
• Language: English
• Published: Rivista Italiana di Paleontologia e Stratigrafia (Research In Paleontology and Stratigraphy) 2017
• Subjects: Stratigraphy; Cretaceous; Tethys Himalaya; Planktonic foraminifera.; Indian; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.13130/2039-4942/8961; http://riviste.unimi.it/index.php/RIPS/article/view/8961

Detailed biostratigraphic study of mid-Cretaceous Tethys Himalayan pelagic units shed new light on the evolution of the northern India passive continental margin. After a major episode of alkaline magmatism recorded from Zanskar to Nepal in the Early Cretaceous, condensed glauco-phosphorites were deposited during the Rotalipora subticinensis Subzone, and were overlain unconformably by pelagic mudstones during the Rotalipora ticinensis to Rotalipora appenninica Zones (Fatu La Formation in Zanskar and Muding Formation in Nepal). Throughout the Tethys Himalaya drowning of clastic shelves thus occurred with the same modalities and synchronously in Late Albian time. The base of the Chikkim Formation in Zanskar is younger, and overlies palimpsest arenites and reworked glauco-phosphorires deposited during the latest Cenomanian Whiteinella archaeocretacea Zone. Hiatuses several million years long, mainly coeval and similar in duration in the Chikkim and Fatu La Formations, characterize the Cenomanian and the Late ... : Rivista Italiana di Paleontologia e Stratigrafia (Research In Paleontology and Stratigraphy), V. 97, N. 3-4 ...