Sm-Nd age and mantle source characteristics of the Dhanjori volcanic rocks, Eastern India.

Roy, Abhinaba; Sarkar, Anindya; Jeyakumar, S. Johnson; Aggrawal, S. K.; Ebihara, Mitsuru

doi:10.2343/geochemj.36.503

Cited by 81 publications

(43 citation statements)

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“…Unlike the ultramafic rocks, these basaltic rocks are unaltered except for the occasional chloritization of pyroxenes. Isotopic analyses of these basalts yield a Palaeoproterozoic Sm-Nd isochron age of 2072 ± 106 Ma (MSWD = 1.56; Roy et al, 2002). In addition, there are a few small bodies of coarse-grained gabbro and peridotites cutting the younger member (Gupta et al, 1985;Gupta, 1998; senior authors unpublished data).…”

Section: Volcanic Rocksmentioning

confidence: 99%

“…2; Gupta et al, 1985;Roy et al, 2002;Mazumder, 2002). They are mostly massive but show excellent flow banding (Fig.…”

Section: Volcanic Rocksmentioning

confidence: 99%

“…The ultramafic rocks have a komatiitic affinity both in terms of chemistry and texture (microspinifex texture, see Gupta et al, 1980, their Fig. 5;Gupta et al, 1985;Majumder, 1996;Roy et al, 2002;cf. Le Bas, 2000.…”

Section: Volcanic Rocksmentioning

confidence: 99%

“…Most of the ultramafic rocks (peridotitic komatiite as well as peridotites; Fig. 9a and b) are confined to the lower level of the Upper member but some are interlayered with the sandstones (Gupta et al, 1985;Roy et al, 2002;Mazumder, 2002). The MgO content of the ultramafic rocks varies from 25 to 13% (Gupta et al, 1985).…”

Section: Volcanic Rocksmentioning

confidence: 99%

“…The 2.1-Ga-old Dhanjori Formation (Roy et al, 2002) covers 800 sq. km area, and is composed of siliciclastic sedimentary rocks interlayered with mafic to ultramafic and rare acidic volcanic and volcaniclastic rocks deformed and metamorphosed to lower greenschist facies (Dunn and Dey, 1942;Iyenger and Alwar, 1965;Sarkar andSaha, 1962, 1977;Sarkar, 1984;Gupta et al, 1985;Basu, 1985;Singh, 1998;Singh and Nim, 1998).…”

Section: Geological Backgroundmentioning

confidence: 99%

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Sedimentation history of the Palaeoproterozoic Dhanjori Formation, Singhbhum, eastern India

Mazumder

Sarkar

2004

Precambrian Research

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The Palaeoproterozoic Dhanjori Formation, eastern India is a terrestrial (dominantly fluvial) volcano-sedimentary succession. Basal conglomerate, coarse-grained sandstone, and shale rests directly on the granite basement and represents the distal fringe of an alluvial fan complex. Sieve, sheet flood, mass flow and alluvial channel and overbank deposits comprise the fan segment. The rest of the formation is entirely constituted by fining upward fluvial cycles. An event of basin tilting and volcanic eruption intervened and resulted a second phase of Dhanjori sedimentation, although the general fluvial depositional framework remained unaltered. The two members of the Dhanjori Formation display different paleocurrent trends related to fluvial response to basin tilting. In the lower member spatial variability in paleocurrent directions occurs as a consequence of fan development. Unlike the first phase, the second phase of fluvial deposition incorporates profuse volcanics and accompanying volcaniclastic deposits. These volcanic and volcaniclastic rocks might have locally blocked the river courses resulting in short-lived lacustrine deposition. Composition of the volcanics varies upward from ultramafic to mafic. The Dhanjori volcanism took place in an intracontinental rift setting as is evident from the interbedded terrestrial deposits. Interbedded volcanic and volcaniclastic rocks in different stratigraphic levels suggest episodic volcanic eruption. A semiarid paleoclimate is proposed and is consistent with development of an alluvial fan comprised of coarse clastic deposits.

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Section: Volcanic Rocksmentioning

confidence: 99%

“…2; Gupta et al, 1985;Roy et al, 2002;Mazumder, 2002). They are mostly massive but show excellent flow banding (Fig.…”

Section: Volcanic Rocksmentioning

confidence: 99%

Section: Volcanic Rocksmentioning

confidence: 99%

Section: Volcanic Rocksmentioning

confidence: 99%

Section: Geological Backgroundmentioning

confidence: 99%

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Sedimentation history of the Palaeoproterozoic Dhanjori Formation, Singhbhum, eastern India

Mazumder

Sarkar

2004

Precambrian Research

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Detrital zircon U–Pb LA‐ICPMS ages from the Kolhan Group, Singhbhum Craton, eastern India: Implications for terminal Mesoproterozoic palaeogeography between Columbia and Rodinia along the Central Indian Tectonic Zone

et al. 2020

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The Kolhan Group in the Singhbhum Craton of eastern India is a passive margin siliciclastic shelf to deep‐water carbonate ramp platform succession. It occupies a unique position in respect of the Central Indian Tectonic Zone (CITZ), widely considered as the suture joining the northern and southern Indian cratonic blocks at the time of amalgamation of the Mesoproterozoic supercontinent Columbia. The Kolhan succession is closely comparable to other Late Proterozoic ‘Purana’ successions of India including the siliciclastic‐carbonate Suasar Group from the central part of the CITZ. We report here the first U–Pb detrital zircon ages from the Kolhan Group. The youngest age population obtained from basal siliciclastics suggests it is not older than ca. 1,158 Ma. The absence of any concordant detrital zircon <1,000 Ma which is well represented in the adjoining Singhbhum Shear Zone and CITZ extensions, suggests that the sedimentation took place prior to ca. 1,000 Ma. The Kolhan Group, therefore, records an extensional event between two major episodes of supercontinent assembly (i.e., Columbia and Rodinia). A similar motif of extension and passive margin sedimentation across Mesoproterozoic Peninsular India together with the widespread Mesoproterozoic lamproite and kimberlite emplacement event suggests an episode of extension and major basin development across the Indian Shield in between the two supercontinent amalgamation cycles of Columbia and Rodinia.

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Indian Cratons

Jain¹,

Banerjee²,

Kale³

2020

Society of Earth Scientists Series

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Sm-Nd age and mantle source characteristics of the Dhanjori volcanic rocks, Eastern India.

Cited by 81 publications

References 54 publications

Sedimentation history of the Palaeoproterozoic Dhanjori Formation, Singhbhum, eastern India

Sedimentation history of the Palaeoproterozoic Dhanjori Formation, Singhbhum, eastern India

Detrital zircon U–Pb LA‐ICPMS ages from the Kolhan Group, Singhbhum Craton, eastern India: Implications for terminal Mesoproterozoic palaeogeography between Columbia and Rodinia along the Central Indian Tectonic Zone

Indian Cratons

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