Lithofacies Study of the Mesozoic Rocks of Wandhaya Area, Southwest of Bhuj, Kachchh Mainland, Gujarat
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Lithofacies Study of the Mesozoic Rocks of Wandhaya Area, Southwest of Bhuj, Kachchh Mainland, Gujarat Puja B. Jadav*, Jyoti S. Morya, Aagam K. Shah and Paras M. Solanki Department of Geology, M.G. Science Institute, Navrangpura, Ahmedabad - 380 009, India. *E-mail: [email protected]
ABSTRACT The stratigraphic sequence exposed in Wandhaya area comprises of marine clastic sediments of Mesozoic, which includes M-III and M-IV of Jumara Formation, Lower Member of Jhuran Formation and Upper Member of Bhuj Formation. Lithofacies erected from the study area are Shale Facies (SF), Oolitic Limestone Facies (OLF), Intercalated Shale Siltstone Facies (ISSF) and Massive Sandstone Facies (MSF). SF is developed in M-III and M-IV of Jumara Formation suggesting its deposition in transition zone. Oolitic Limestone Facies (OLF) occurs only in M-IV of Jumara Formation indicates its depositional environment as offshore region. Intercalated Shale Siltstone Facies (ISSF) is deposited in lower shoreface to transitional and Massive Sandstone Facies (MSF) in foreshore environment, are exposed in Lower Member of Jhuran Formation and also in Upper Member of Bhuj Formation. The sediment characteristics and association of trace fossils in the rocks indicate distinction in sedimentation from foreshore to offshore environments. INTRODUCTION Kachchh Peninsula is divided into Mainland, Pachham Island and Eastern Kachchh. Among those only Mainland of Kachchh shows completely exposed sequence of Mesozoic stratigraphy from Middle Jurassic (Bathonian) to Recent. It is an incredibly famous region amongst geologists for its rich fossil content and spectacular outcrops of shallow marine deposits (Patel et al., 2015). The Mesozoic stratigraphic sequence of the mainland is grouped into four formations formally as the Jhurio, Jumara, Jhuran and Bhuj formation in ascending order, of which Bhuj Formation is disconformably overlain by the basic flows of the Deccan Traps (Biswas et al., 1973) on the south while the base of the Jhurio Formation is not exposed. Kachchh has been great attraction for geologist for its unique sedimentary and tectonic character, for the reason great work has also been done. The lithostratigraphy was studied by Biswas (1977, 1993) and Fursich et al. (2001, 2003) in great detail by detailed mapping of the entire basin and intra-basin correlation. Recently tectonic stability of Kachchh basin has been recorded based on geochemistry of siliciclastic sediments of Mesozoic (Chaudhari et al., 2020). Sedimentological and tectonic setting of Kachchh Mainland based on petrography, geochemical and facies analysis was done by Khan et al. (2016) and Ghaznavi et al. (2018, 2019). The intent of this paper is to document depositional environment of the Mesozoic succession in the area based on the sedimentological characteristics of the lithofacies. Tectonic study on Katrol hill fault (KHF) near Wandhaya area was previously done, but the paleoenvironment based on the lithofacies study of the Wandhaya area is covered in this work. GEOLOGICAL SETT
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