Teleseismic receiver functions modeling of the eastern Indian craton Prantik Mandal ⇑ , Koushik Biswas CSIR-National Geophysical Research Institute, Hyderabad, Andhra Pradesh, India article info Article history: Received 10 May 2016 Received in revised form 3 July 2016 Accepted 3 July 2016 Available online 5 July 2016 Keywords: Teleseismic Receiver Functions Singhbhum Odisha Craton Crustal thickness Chotanagpur granitic-gneissic terrain Crustal thinning abstract We estimate receiver functions (RFs) through the time-domain deconvolution using three-component broadband data of 100 teleseismic events (30° 6 ^ 6 90°) from 15 seismographs in the eastern Indian craton. Estimated radial RFs show a positive phase at 4.6–5.8 s delay time corresponding to the crustal thicknesses of 37–46 km. Through the differential evolution (DE) waveform inversion modeling of radial receiver functions, we delineate the crustal structure at 15 broadband stations. On an average, the Archean Singhbhum Odisha Craton (SOC) is characterized by a thick crust of 43 ± 3 km in comparison to a relatively thin crust of 41 ± 1 km underlying the Proterozoic Chotanagpur Granite Gneissic terrain (CGGT). While, a thin crust of 38 ± 1 km characterizes the younger Eastern Ghats Mobile Belt (EGMB). The main results of our modeling reveal a 46 km thick Archean crust underlying the Singhbhum granite (SG) of 3.6 Ga, which is characterized by a 3 km crustal thickening probably resulted from the Archean subduction process. Our modeling also detects a 2–3 km crustal thinning with the thinnest crust of 37 km below the region near South Singhbhum Shear Zone, which could be attributed to the 1.6 Ga plume activity associated with Dalma volcanic. Our modeling also led to the delineation of a crustal thin- ning of 2–3 km underlying the region in EGMB, which was influenced by a much younger (117 Ma) Rajmahal magmatism associated with the Gondwana break-up episode. However, our study could not detect any age-dependent variation of crustal thicknesses in the eastern Indian craton. The main result of our modeling suggests a two-phase crustal evolution process for the SOC viz. older E-W crustal thickening due to E-W plate compression and later crustal thinning episodes associated with the Dalma volcanism in the north and the Rajmahal volcanism in the South. Ó 2016 Elsevier B.V. All rights reserved. 1. Introduction The stable cratonic lithosphere is the upper layer that moves mechanically and coherently with plate motions, which, in general, consists of crust and upper mantle. It has been suggested that crus- tal thickness is directly proportional to age, excepting young mountain belts, with oldest and coldest Archean crust being the thickest (Pavlenkova, 1987; Zuber et al., 1989; Nelson, 1991). On the contrary, a global review of seismic studies revealed that Archean crust (27–40 km) is thinner than Proterozoic crust (40–55 km) (Durrheim and Mooney, 1992). On another note, Archean crust (40–55 km) is found to be thicker than Proterozoic crust (30 km) in the Karelian Province of Baltic Province (Gaal and Gorbatschev, 1987). Thus, presently there is an ongoing debate regarding the validity of above two crustal evolution models for different cratons in the world, which are of Archean and Protero- zoic ages. The Indian lithosphere has a long history of interaction with deep mantle processes that resulted, for example, in the formation of rifts, sutures, and mega lineaments (Naqvi and Rogers, 1987). Naqvi and Rogers (1987) proposed that the Indian peninsular shield (2.0–3.6 Ga) is consisting of six widespread Archean–Early Proterozoic cratons, which provides a unique opportunity to study the characteristic differences between the Archean and Proterozoic cratonic crust. With an objective to search for the crustal evolution model of the Indian craton, our present study focuses on studying the crustal structure associated with a region, which covers both Archean Singhbhum Odisha Craton (SOC) and Proterozoic Chotanagpur Granite Gneissic Terrain (CGGT) that occupies an area of 240,000 km 2 of the eastern Indian shield (Fig. 1a). The SOC assumes significance because it is one of the oldest cra- tonic nuclei of the Indian landmass (Mukhopadhyay, 2001; Mukhopadhyay et al., 2008). The Archean nucleus of SOC consists of Singhbhum granite complex of 3.6 Ga by detrital zircon dating (Naqvi and Rogers, 1987; Sharma et al., 1994) that surrounded by volcano-sedimentary supracrustals and arcuate Proterozoic belt of Chotanagpur (Fig. 1a). The Singhbhum granite body extends more than 150 km in north-south and more than 70 km in an east-west direction between latitude 21°N and 22.75°N and http://dx.doi.org/10.1016/j.pepi.2016.07.002 0031-9201/Ó 2016 Elsevier B.V. All rights reserved. ⇑ Corresponding author. E-mail address: prantik@ngri.res.in (P. Mandal). Physics of the Earth and Planetary Interiors 258 (2016) 1–14 Contents lists available at ScienceDirect Physics of the Earth and Planetary Interiors journal homepage: www.elsevier.com/locate/pepi