An Integrated Study of Proterozoic Dykes, Dharwar Craton, Southern India

Chapter 3 The Archaean and Proterozoic history of Peninsular India: tectonic framework for Precambrian sedimentary basins in India

“…The NE-SW-and ENE -WSW-oriented dykes of the Anantapur swarm are dated using K -Ar measurements and are poorly constrained between 1900 -1700 and 1500-1350 Ma, respectively (Murthy et al 1987;Mallikarjuna et al 1995). Several detailed palaeomagnetic studies on dykes from this region indicate that the dykes are part of several larger swarms, including the 2.4 and 1.9 Ga swarms seen elsewhere in the Dharwar and Bastar cratons (Halls et al 2007;Meert et al 2011;Piispa et al 2011;Belica et al 2014). Additional considerations based on cross-cutting relationships between dykes in this area suggest that a c. 2.0-2.1 Ga dyke swarm is also present in the region (Belica et al 2014).…”

New paleomagnetic results on $$\sim $$ ∼ 2367 Ma Dharwar giant dyke swarm, Dharwar craton, southern India: implications for Paleoproterozoic continental reconstruction

“…Therefore, this dyke swarm was emplaced geologically in a very short time span. Several workers have previously reported rock magnetic, paleomagnetic, geochemical and geochronology results on many dykes from the DGDS (Radhakrishna and Joseph 1996;Piispa et al 2011;Dash et al 2013;Belica et al 2014). Paleomagnetism and ages have been reported at northern and southern part of the DGDS but not from central part of the ∼ 2367 Ma swarm which forms the focus of our study.…”

Geochemistry, petrogenesis, and geodynamic implications of NE–SW to ENE–WSW trending Palaeoproterozoic mafic dyke swarms from southern region of the western Dharwar Craton

“…Earlier works suggest that the entire Dharwar Craton (includes the EDC, WDC, and NGT) probably share common mafic magmatic events, particularly represented by distinct Palaeoproterozoic dyke swarms (cf. Samal et al, ); however, these are studied, in detail, more frequently for their geochemical characterization and petrogenesis for the EDC (French & Heaman, ; Piispa et al, ; Kumar, Hamilton, & Halls, ; Kumar, Nagaraju, et al, ; Srivastava, Jayananda, Gautam, Gireesh, & Samal, ; Srivastava, Jayananda, Gautam, & Samal, ; Srivastava & Gautam, , and references therein) but barely for the WDC and the NGT. As NE–SW to ENE–WSW dykes are more frequently emplaced within the entire Dharwar Craton, a systematic sampling from these mafic dykes from the WDC have been done for the present work.…”

“…Many of these mafic magmatic events are chiefly represented today by dykes and dyke swarms of different trends and ages (Ernst & Srivastava, ; Murthy, ; Samal et al, ; Srivastava et al, , and references therein). A number of distinct Palaeoproterozoic mafic dykes are reported to have emplaced within the Dharwar Craton (Dash et al, ; Drury, ; Halls, ; Murthy, ); however, they are more conspicuous in the eastern Dharwar Craton (Chatterjee & Bhattacharji, ; Halls, Kumar, Srinivasan, & Hamilton, ; Radhakrishana, Krishnendu, & Balasubramonian, ; Ernst & Srivastava, ; French & Heaman, ; Piispa et al, ; Srivastava, Samal, & Gautam, ; Samal et al, ; Söderlund et al, , and references therein; see Figure ). The Dharwar Craton is also thought to be an integral part of several ancient supercontinents such as Superia and Sclavia (French & Heaman, ; Nilsson, Klausen, Söderlund, & Ernst, ; Srivastava, Jayananda, Gautam, Gireesh, & Samal, ; Srivastava, Jayananda, Gautam, & Samal, ; Srivastava & Gautam, ), Nuna/Colombia (Belica et al, ), and Rodinia (Ernst, Bleeker, Söderlund, & Kerr, ).…”

“…Palaeoproterozoic mafic dykes of the eastern Dharwar Craton (EDC) have been studied in detail for their petrology and geochemistry (Chatterjee & Bhattacharji, ; Radhakrishana et al, ; French & Heaman, ; Piispa et al, ; Srivastava, Jayananda, Gautam, Gireesh, & Samal, ; Srivastava, Jayananda, Gautam, & Samal, ; Srivastava & Gautam, , and references therein) and geochronology (Halls et al, ; French & Heaman, ; Kumar, Hamilton, & Halls, ; Kumar, Nagaraju, Besse, & Bhaskar Rao, ; Kumar, Nagaraju, Srinivasa Sarma, & Davis, ; Kumar, Parashuramulu, & Nagaraju, ; Srivastava, Hamilton, & Jayananda, , Srivastava, Jayananda, Gautam, Gireesh, & Samal, ; Srivastava, Jayananda, Gautam, & Samal, ; Srivastava & Gautam, ; Nagaraju, Parashuramulu, Babu, & Narayana, ; Nagaraju, Parashuramulu, Kumar, & Sarma, ; Söderlund et al, ); however, very limited similar information is available for the western Dharwar Craton (WDC; Devaraju, Alapieti, Sudhakara, & Kaukonen, ; French & Heaman, ; Halls et al, ; Naqvi, Divakara Rao, Satyanarayana, & Hussain, ; Radhakrishna, ; Radhakrishna, Balasubramonian, Joseph, & Krishnendu, ; Samal et al, , and references therein). Therefore, a major NE–SW to ENE–WSW trending Palaeoproterozoic mafic dyke swarm exposed in the WDC, particularly in and around southern region (Tiptur–Hassan–Chikmagalur sector; see Figure ), have been sampled for detailed petrological and geochemical studies.…”