Zircon U‐Pb/Lu‐Hf and monazite chemical dating of the Tirodi biotite gneiss: implication for latest Palaeoproterozoic to Early Mesoproterozoic orogenesis in the Central Indian Tectonic Zone

Abstract

In this investigation, we reconstruct the latest Palaeoproterozoic to Early Mesoproterozoic orogenic events along the southern margin of the Central Indian Tectonic Zone (CITZ), using sensitive high resolution ion microprobe (SHRIMP) U-Pb zircon dating and Lu-Hf isotope analyses of zircon and Th-U-Pb chemical dating of monazite from samples of the Tirodi biotite gneiss (TBG) unit in the Sausar Mobile Belt (SMB), the latter constituting the southernmost litho-tectonic component of the CITZ. U-Pb zircon dating of one migmatitic gneiss sample from the type locality of the Tirodi biotite gneiss in the northern domain of the SMB has yielded an age of 1618 AE 8 Ma, which is considered to be the time of magmatic crystallization of its protolith. Combined U-Pb zircon and monazite chemical dating of two granite gneiss samples from the southern domain of the SMB broadly constrain magmatic crystallization between 1603 AE 23 Ma and 1584 AE 17 Ma and an overprinting metamorphic recrystallization event at 1572 AE 7 Ma. Monazites from the granite gneiss samples also record a terminal metamorphic event at 1415 AE 23 Ma. Lu-Hf isotopic analyses of zircons reveal fundamentally different source rock reservoirs for the protoliths of these magmatic rocks across the SMB. While the type TBG from the northern domain was derived from an Early Palaeoproterozoic source T DM c (Hf) from 2093 to 2523 Ma, with a mean value at 2379 Ma) of essentially juvenile material with minor crustal components (eHf(t) from À3.3 to þ 3.7), the granite from the southern domain had a mature crustal source (eHf(t) from À12.5 to À21.9) of Palaeoarchaean age T DM c (Hf) from 3051 to 3630 Ma, with a mean value at 3218 Ma). When integrated with metamorphic information previously obtained from the 1.6 Ga ultra-high temperature granulite facies metamorphic event in the SMB, the discrete magmatic and metamorphic events between 1.62/1.60 Ga and 1.42 Ga can be correlated with the formation of an Early Mesoproterozoic accretionary orogen in the CITZ.

Chapter 11 Palaeoproterozoic supracrustals of the Bastar Craton: Dongargarh Supergroup and Sausar Group

“…11.2). The depleted mantle model age, T DM (Hf), of the juvenile source of the Tirodi gneiss I is c. 3218 Ma (range 3051 -3630 Ma, Bhowmik et al 2011). In this chapter, the older to younger components of the Tirodi gneiss are distinguished by additional roman numerals I -IV.…”

Spatio-temporal evolution of the Satpura Mountain Belt of India: A comparison with the Capricorn Orogen of Western Australia and implication for evolution of the supercontinent Columbia

“…The Indian craton is divided into two blocks (the North Indian Block and the South Indian Block) by a prominent orogenic belt (the Satpura Orogen) with wENE-WSW trend in the central part of India. This orogen was earlier considered to be of Grenville (w1000 Ma) age (Bhowmik et al, 1999;Acharyya, 2001;, and was subsequently revised to be of 1600e1500 Ma (Acharyya, 2003;Bhandari et al, 2011;Bhowmik et al, 2011). However, Mohanty (2003Mohanty ( , 2010a has questioned the basis of such an inference, and has shown that this mountain belt had the first orogenic imprint of w2100e1900 Ma and a second event at w1800 Ma.…”

“…The earliest of these were developed syn-kinematically with the first deformation of the Sausar Group and have 2100e2200 Ma ages (e.g., 2106 Ma Sm-Nd age for Tirodi Gneiss by Ahmad et al, 2009; 2170 AE 70 Ma Rb-Sr age for the thermal overprint on the Amgaon Gneiss reported by Sarkar et al, 1981 and 2199 AE 178 Ma Rb-Sr age for the Malanjkhand pink granite determined by Panigrahy et al, 1993). The later granites and migmatites have ages between 1618 and 1415 Ma (U-Pb zircon age of 1618 AE 8 Ma reported for Tirodi Gneiss by Bhowmik et al, 2011; 1553 AE 19 Ma U-Pb zircon age for metamorphism of Tirodi Gneiss suggested by Ahmad et al, 2009; 1525 AE 70 Ma Rb-Sr age Barman et al, 1994;C-11: Mallik, 1993; C-12: Rb-Sr WR age Krishna et al, 1996;C-13: Rb-Sr WR age Pandey et al, 1986b;C-14: ID-TIMS monazite ages Chatterjee et al, 2010;C-15: Rb-Sr WR age Pandey et al, 1986a;C-16: Mazumdar, 1996; C-17: U-Pb zircon upper intercept age Sarkar et al, 1998;C-18: ID-TIMS U-Pb zircon upper intercept age Chatterjee et al, 2008;C-19: Rb-Sr WR age Sarkar et al, 1998;C-20: Rb-Sr WR isochron age Dhurandhar et al, 2005Dhurandhar et al, , 2006; C-21: ID-TIMS U-Pb zircon age Chatterjee et al, 2010;C-22: GSI Rec. 125(2), 19-21 (1992); C-23: Pb-Pb WR age Dwivedi et al, 2011;C-24 Sarkar et al, 1986a; 1415 AE 23 Ma monazite overgrowths in Tirodi Gneiss reported by Bhowmik et al, 2011).…”

Carbon and oxygen isotope systematics of a Paleoproterozoic cap-carbonate sequence from the Sausar Group, Central India

“…For example, Ahmad et al (2009) reported a 2056 ± 7 Ma U-Pb zircon age for Tirodi Gneiss; Sarkar et al (1981) determined a 2170 ± 70 Ma Rb-Sr age for the thermal overprint on the Amgaon Gneiss; and Panigrahy et al (1993) reported a 2199 ± 178 Ma Rb-Sr age for the Malanjkhand pink granite. The second group of granites and migmatites developed syn-tectonically with the second deformation of the Sausar Group and have ages between 1618 and 1415 Ma (U-Pb zircon age of 1618 ± 8 Ma reported for Tirodi Gneiss by Bhowmik et al (2011); 1553 ± 19 Ma U-Pb zircon age for metamorphism of Tirodi Gneiss suggested by Ahmad et al (2009); 1525 ± 70 Ma Rb-Sr age determined for Tirodi Gneiss by Sarkar et al (1986); 1415 ± 23 Ma monazite overgrowths in Tirodi Gneiss reported by Bhowmik et al, 2011). The juvenile sources of these later gneisses have a T DM (Hf) age between 2093 and 2523 Ma (Bhowmik et al, 2011) and a T DM (Sm-Nd) age of 2118-2503 Ma ).…”

“…The second group of granites and migmatites developed syn-tectonically with the second deformation of the Sausar Group and have ages between 1618 and 1415 Ma (U-Pb zircon age of 1618 ± 8 Ma reported for Tirodi Gneiss by Bhowmik et al (2011); 1553 ± 19 Ma U-Pb zircon age for metamorphism of Tirodi Gneiss suggested by Ahmad et al (2009); 1525 ± 70 Ma Rb-Sr age determined for Tirodi Gneiss by Sarkar et al (1986); 1415 ± 23 Ma monazite overgrowths in Tirodi Gneiss reported by Bhowmik et al, 2011). The juvenile sources of these later gneisses have a T DM (Hf) age between 2093 and 2523 Ma (Bhowmik et al, 2011) and a T DM (Sm-Nd) age of 2118-2503 Ma ). On the basis of the above geochronological data the deposition of the Sausar Group is inferred to be between 2378 ± 17 and 2200 Ma.…”