Tectonic juxtaposition of plume and subduction derived magmatic sequences in the Bababudan greenstone terrane, western Dharwar Craton, India: Constraining crustal accretion processes in a Neoarchean subduction-collision orogeny

Manikyamba, C.; Ganguly, Sohini; Santosh, M.; Tang, Li; Sindhuja, C.S.; Pahari, Arijit; Singh, Th. Dhanakumar; Saha, Abhishek

doi:10.1016/j.precamres.2021.106097

Cited by 9 publications

(3 citation statements)

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“…Form a global perspective, substantial lines of geological evidence support the occurrence of slab subduction in the Dharwar Craton, Tanzania Craton, Kappvaal Craton, North Atlantic Craton, Pilbarn Craton, Yilgarn Craton and Superior Province [52][53][54] . Geochemical data indicates the presence within these cratons of low Nb/La basalts (N = 271) 24 (Supplementary Data 2).…”

Section: Discussionmentioning

confidence: 99%

“…(2) If slab subduction can occur at the initial evolution of most cratons, the style of subduction might be similar to the Archean at subduction in this study. The geological records of craton evolution suggest the gradual development of slab subduction 1,2,4,[52][53][54] . By nal cratonization, the end values of slab dip can basically reach the maximum (~25°) of the Archean at subduction, and transform into a steep pattern 17 (Fig.…”

Section: Discussionmentioning

confidence: 99%

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Two styles of Neoarchean slab subduction revealed by mantle oxygen fugacity

Liu

Gao

Wang

et al. 2023

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Subduction of oceanic lithosphere is widely invoked for the Neoarchean but the thermal and geometrical configurations of the inferred subduction zones remain poorly constrained. Two Neoarchean subduction-related tectonic belts (A and B) with contrasting lithotectonic evolutions are preserved in the North China Craton. In Belt A, the oxygen fugacity of ca. 2.6-2.5 Ga modified mantle from crustal recycling-related basalts is coincident with modern arc mantle, but that of Belt B is more reducing. Based on the relationship between mantle redox state and slab dip from contemporary arcs, the dip of subducting oceanic lithosphere in Belt A was in a relatively steep dip (~50°), whereas Belt B had a low angle dip (~15°). These belts represent contrasting styles of Neoarchean subduction with significant differences in mantle temperature and redox state, lithosphere thickness and slab dip.These discoveries further refine our insights into Archean slab subduction and the early Earth’s geodynamic evolution.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Two styles of Neoarchean slab subduction revealed by mantle oxygen fugacity

Liu

Gao

Wang

et al. 2023

Preprint

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“…The Chitradurga greenstone belt is divided into the Vanivilas, Ingaldhal and Hiriyur Formations (Swami Nath & Ramakrishna, 1981). A recent study reports the U–Pb zircon age of 3,177 ± 7 Ma for the komatiites of the Santavari Formation of the Bababudan greenstone belt (Manikyamba et al, 2021). The Sm–Nd age of metabasalts of the Kalasapura Formation and the U–Pb SHRIMP zircon age from felsic volcaniclastic rocks of the Mullayanagiri Formation of the Bababudan Group yield an age of 2,910 Ma and 2,720 Ma, respectively (Kumar et al, 1996; Trendall, De Laeter, Nelson, & Mukhopadhyay, 1997).…”

Section: Geological Backgroundmentioning

confidence: 99%

Geochemistry of the Neoarchean Dodguni carbonates of Chitradurga greenstone belt, Dharwar Craton, India: Implications on depositional environment

et al. 2022

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The carbonates of the Dodguni area of the Chitradurga greenstone belt, Dharwar Craton, India were studied to understand the Archean diagenetic and palaeodepositional conditions using carbon and oxygen isotopes along with whole-rock geochemistry. These carbonates show significant variation in δ 13 C and δ 18 O (À1.73‰ Vienna Peedee Belemnite [VPDB] to À0.45‰ VPDB and δ 18 O vary from À13.51‰ VPDB to À8.46‰ VPDB, respectively). The rare earth element (REE) + Y (rare earth elements and yttrium) of the studied carbonate rocks exhibit flat and uniform patterns (Pr SN /Yb SN = 0.4-1), slight positive La, Eu and Gd anomalies (Ce SN / Ce SN * = 0.8-0.9; Eu SN /Eu SN * = 0.7-1.4 and Gd SN /Gd SN * = 2-2.3, respectively) with slight positive Ce anomalies (Pr SN /Pr SN * = 0.84-0.86) and superchondritic Y/Ho ratios (Y/Ho = 29-45; chondritic Y/Ho = 28). Their negative δ 13 C (À1.75‰ to À0.45‰) values are attributed to the influence of higher bio-productivity during their deposition and oxidation of organic carbon. The geochemical and isotopic systematics suggest that the Dodguni limestones are not affected by the diagenetic and metamorphic processes and record the REE geochemistry of the ancient seawater in which they were precipitated. The comprehensive geochemical including the isotopic studies of the Archean carbonate rocks of the Dharwar Craton, indicate their deposition in shallow marine conditions, precipitation in high temperatures with significant hydrothermal input under the influence of high bio-productivity, thereby providing valuable constraints on the palaeoceanography and geochemical evolution of the Archean sea.

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