Crust-mantle structure and lithospheric destruction of the oldest craton in the Indian shield

Vasanthi, A.; Singh, Aneesha; Kumar, Niraj; Rao, B. Nageswara; Satyakumar, Animireddi V.; Santosh, M.

doi:10.1016/j.precamres.2021.106280

Cited by 17 publications

(2 citation statements)

References 82 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, all the above proposed models are entirely based on geochronological and other geological studies (stratigraphic correlation, sedimentological information, magmatism, deformation, and metamorphism) and do not include the geophysical components. Existing geophysical studies have attempted to map the gross lithospheric structure of the Eastern Indian Shield (EIS) and do not specifically describe the crustal evolution of the NSMB (Bhattacharya & Shalivahan, 2002; Das et al, 2019; Kayal, Srivastava, Kumar, Chatterjee, & Khan, 2011; Mandal, 2017, 2019; Mandal et al, 2021; Mandal & Biswas, 2016; Singh, Kumar, Rao, & Tiwari, 2021; Singh, Kumar, & Zeyen, 2015; Vasanthi et al, 2021). A detailed summary of results obtained from previous studies of the EIS is provided in Section 1.1.…”

Section: Introductionmentioning

confidence: 99%

“…In the past, several geophysical investigations were carried out to study the crustal structure of the EIS (Bhattacharya & Shalivahan, 2002; Das et al, 2019; Haldar, Kumar, Kumar, Ray, & Srinagesh, 2018; Kaila et al, 1992; Kayal et al, 2011; Kumar et al, 2016; Mandal, 2017, 2019; Mandal et al, 2021; Mandal & Biswas, 2016; Singh et al, 2015; Singh et al, 2021; Vasanthi et al, 2021). Mandal (2017) reported a mean Moho depth of 42 ± 4 km in the SC and 42 ± 1 km in the CGGC based on receiver function analysis.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Crustal architecture of North Singhbhum Mobile Belt, Eastern Indian Shield: Constraints from two‐dimensional and three‐dimensional modelling of Bouguer gravity and aeromagnetic data

2022

View full text Add to dashboard Cite

The North Singhbhum Mobile Belt (NSMB) that lies in the Eastern Indian Shield between the Chotanagpur Granite‐Gneiss Complex (CGGC) and the Singhbhum Craton (SC) provides a unique opportunity to understand the Proterozoic crustal evolution of the Indian shield. In the present study, an integrated interpretation of petrophysical, Bouguer gravity, and aeromagnetic data was carried out to examine the crustal architecture and structural framework of the region. Three‐dimensional (3‐D) inversion of the aeromagnetic anomalies reveals that the magnetic basement depths range from 0.2 to 9.0 km in the region. The crustal models obtained from two‐dimensional (2‐D) and 3‐D forward modelling of potential field data reveal the Moho at 37–38 km depth beneath the NSMB and at a relatively deeper depth of 39–40 km and 40–44 km beneath SC and CGGC, respectively. Further, the distinct gravity high and the coinciding bipolar magnetic anomalies associated with the Dalma Formation can be attributed to the mafic/ultramafic intrusions. Gravity models across the Singhbhum Shear Zone (SSZ) and South Purulia Shear Zone (SPSZ) exhibit the crustal density inhomogeneity and Moho offset, typical of ancient suture zones of Precambrian terrains. In comparison, the absence of such crustal‐scale signatures across the North Purulia Shear Zone represents its intracratonic nature. Further, the Bouguer gravity and aeromagnetic signatures across the SPSZ, together with the crustal architecture and metamorphic ages, suggest that SPSZ marks the eastward continuity of the Gavilgarh‐Tan Shear Zone along which the amalgamation of northern and southern Indian cratonic blocks possibly took place at ca. 1.0–0.9 Ga.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crustal architecture of North Singhbhum Mobile Belt, Eastern Indian Shield: Constraints from two‐dimensional and three‐dimensional modelling of Bouguer gravity and aeromagnetic data

2022

View full text Add to dashboard Cite

show abstract

Possible occurrence of Palaeoarchean ferropicrite cumulates and ferrobasalts in the Jojohatu area of North Singhbhum Craton, eastern India: Evidence for a mantle plume source

et al. 2021

View full text Add to dashboard Cite

An occurrence of Palaeoarchaean ferropicrite cumulates and ferrobasalts is being reported from the Jojohatu area of the Iron Ore Group (IOG) greenstone belt, which is situated in the northern part of the Singhbhum Craton (eastern India). The ferropicrite cumulates contain serpentine and clinopyroxene as major constituents and spinel, magnetite, and ilmenite as accessories. Their bulk rock chemistry exhibits an extremely high amount of FeOT (19.0–20.8 wt%) and MgO (22.0–23.9 wt%) and quite low Al2O3 (4.5–5.2 wt%) and Na2O + K2O (<1.0 wt%), thus making them as one of the most Fe‐rich ferropicrite cumulates in the world. They are also characterized by high contents of compatible trace elements (Ni: 986–1,470 ppm; Cr: 990–1,256 ppm) and moderate TiO2 (1.5–1.7 wt%), Nb (15–18 ppm), and Zr (82–90 ppm). These cumulates are possibly formed due to accumulation of olivine from the ferrobasaltic melts. In comparison, ferrobasalts consisting of plagioclase, pyroxene, and opaques are alkaline in nature. Some of the plagioclase and pyroxene grains have shown a signature of metasomatic alteration, which resulted into formation of secondary minerals such as epidote, chlorite, and hornblende. They exhibit relatively low contents of FeOT (14.6–18.4 wt%), MgO (8.4–10.8 wt%), Ni (32–122 ppm), and Cr (41–131 ppm) than the ferropicrite cumulates, while TiO2 (2.9–4.1 wt%), Nb (42–61 ppm), and Zr (216–318 ppm) contents are higher. Incompatible elemental patterns and their ratios, as well as Zr/Y versus Nb/Y plot, indicate their ocean island basalts (OIB) affinity and genesis from a hot mantle plume, having mantle potential temperature of about 1,600°C and pressure of 3.5–5 GPa. Considerably low CaO (3.00–7.16 wt%) and FeO/MgO and CaO/MgO systematics indicate that the primary source of the basaltic melt could be pyroxenite. These volcanic occurrences possibly represent remnants of the OIB formed during the Palaeoarchean in the eastern part of the Indian shield.

show abstract

Lithospheric structure and geodynamical evolution of the Laxmi Ridge: new inferences from satellite gravity studies

Vasanthi

2022

Geo-Mar Lett

View full text Add to dashboard Cite

Crust-mantle structure and lithospheric destruction of the oldest craton in the Indian shield

Cited by 17 publications

References 82 publications

Crustal architecture of North Singhbhum Mobile Belt, Eastern Indian Shield: Constraints from two‐dimensional and three‐dimensional modelling of Bouguer gravity and aeromagnetic data

Crustal architecture of North Singhbhum Mobile Belt, Eastern Indian Shield: Constraints from two‐dimensional and three‐dimensional modelling of Bouguer gravity and aeromagnetic data

Possible occurrence of Palaeoarchean ferropicrite cumulates and ferrobasalts in the Jojohatu area of North Singhbhum Craton, eastern India: Evidence for a mantle plume source

Lithospheric structure and geodynamical evolution of the Laxmi Ridge: new inferences from satellite gravity studies

Contact Info

Product

Resources

About