Planktic Foraminiferal Biostratigraphy of the Cretaceous Oceanic Red Beds in Gyangze, Tibet

Authors: Yuewei L , Chengshan W , Guobiao L , Jinbiao Z , Jingjing W and Kezhantu B

DOI: 10.23880/ijpbp-16000127

Volume 4, Issue 1

Abstract

A set of CORBs developed in the Northern Tethys Himalayan Subzone, southern Tibet, China. The CORB, which is called as the Chuangde Formation, in Gyangze area is mainly composed of micofossil-bearing red limestone and shale intercalated with siliceous rock (chert). This study focuses on the planktic foraminiferal biostratigraphy of the CORB in Gyangze area, Southern Tibet, China. the important elements of the planktic foraminiferal assemblage include Archaeoglobigerina bowi, Globigerilloides ultramicra, G.prairiehillensis, Globotruncana linneiana, G. lapparenti, G. arca, G.ventricosa, G. falsostuarti, Globotruncanella havanensis, Globotruncanita elevata, G. stuartiformis, G. stuarti, Hedbergella holmdelensis, Heterohelix globulosa, H. striata, Radotruncana calcarata, R. subspinosa, and Rugoglobigerina rugosa etc. Four planktonic foraminiferal biozones were recognized (in ascending order) G. elevata, G. ventricosa, R. calcarata and G. havanensis zones, which provided the Chuangde Formation (CORB) with an age of Late Cretaceous Campanian.

Keywords: CORB; Chuangde Formation; Planktonic Foraminifera; Late Cretaceous; Gyangze; Tibet

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