A non-arc tectonic setting for the evolution of Archean gabbro anorthosite Complexes: Evidence from the Singhbhum Craton, eastern India

Rasheed, K.; Sarma, D. Srinivasa; Asokan, Ajay Dev; Bhutani, Rajneesh

doi:10.1016/j.precamres.2021.106250

Cited by 9 publications

(2 citation statements)

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“…We, therefore, suggest that anorthosite of our study area may have crystallized from plagioclase-saturated basaltic melts at p = ~3 kbar. The shape of LLDs produced by stg3 + plag also suggests that some of the gabbros, particularly of Rasheed et al (2021), are products of residual melts generated after the crystallization of anorthosite.…”

Section: Figure 11mentioning

confidence: 97%

“…In the anorthosite rocks (Ghose et al, 2008; this study), both Fe 2 O 3 (t) and MgO contents decline steeply, whereas Al 2 O 3 increases sharply with an increase in SiO 2 from 45.69 to 51.16 wt%. In the gabbro (Manikyamba et al, 2020;Rasheed et al, 2021) and granite (Singh and Krishna, 2009;Saikia et al, 2014;Yadav et al, 2016;Saikia et al, 2017;Saikia et al, 2019) rocks, both Fe 2 O 3T and MgO decrease gradually with increase in SiO 2 from ~48 to ~78 wt%.…”

Section: Whole-rock Geochemistrymentioning

confidence: 98%

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Nature and origin of anorthosite enclaves within Proterozoic granite of Chotanagpur Granite Gneiss Complex of Eastern India

et al. 2022

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The Central Indian Tectonic Zone (CITZ) is a Proterozoic suture along which the Northern and Southern Indian Blocks are inferred to have amalgamated, forming the Greater Indian Landmass. The Chotanagpur Granite Gneiss Complex (CGGC) represents the eastern extension of the CITZ and exposes several granite plutons. Enclaves of diverse origin are present as minor constituents within these granitic bodies. This study reports new major and trace element data for anorthosite enclaves hosted within granites in the Pattharkatti and Rajgir area from the northern margin of CGGC to get modern insights into the petrogenesis of anorthosites. Anorthosite enclaves show sharp contact with the host granite. They contain cumulus plagioclase (An87–94), intercumulus amphibole (magnesiohornblende and ferrotschermakite), and biotite (Mg-biotite and phlogopite) along with minor iron oxides. Amphibole crystallization pressure and temperature are constrained between 0.5 and 6.4 kbar and 653–780°C for the anorthosites. The studied anorthosites display a very gradual and steady increase in whole-rock rare earth element (REE) contents from Lu to La [(La/Yb)N = 1.22–13.08]. They also show a sharp decline in Fe2O3(t) and MgO, whereas Al2O3 increases with increasing silica contents from 45.69 to 51.16 wt%. In the chondrite normalized REE diagram, plagioclase exhibits LREE enriched patterns with strong positive Eu anomaly. The composition of parental liquid for anorthosite from the study area was estimated by adopting the equilibrium distribution method. Parental melt curves from Sm to La are near parallel and constrained broadly between trapped melt fractions (TMF) = ∼5%–15%. Anorthosites of the study area may have formed from the plagioclase-saturated basaltic melt.

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Section: Figure 11mentioning

confidence: 97%

Section: Whole-rock Geochemistrymentioning

confidence: 98%

Nature and origin of anorthosite enclaves within Proterozoic granite of Chotanagpur Granite Gneiss Complex of Eastern India

et al. 2022

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Mineral chemistry, geochemistry and geophysical investigations of Simlipal volcanics from Eoarchean Singhbhum Craton (Eastern India): geodynamic implications of pervasive plume–lithosphere interaction

Dwivedi

Jafri

Sarma

et al. 2022

Int J Earth Sci (Geol Rundsch)

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Geochemical Studies in India: CSIR-NGRI Contributions

Mohan

Sarma

Khanna

et al. 2021

Journal of the Geological Society of India

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The Indian Shield, composed of diversified rock types, formed at different ages, emplaced in varied tectonic environments, is a natural laboratory for the geoscientific community. Multi-disciplinary studies involving tools like field geology, petrography, geophysics and geochemistry can better probe the Earth’s interior at a higher resolution. The Geochemistry Division, equipped with state-of-the-art analytical facilities such as XRF, SEM-EDS, MC-TIMS and LA-HR-ICP-MS, has made pioneering contributions to better understand the evolutionary history of the Indian Shield. This excerpt provides a glimpse of the research activities carried out by the Geochemistry Group during the last 55 years. Significant contributions include (1) geodynamics and crustal evolution of the Indian Plate in terms of nucleation, accretion and amalgamation of the three Protocontinents: Dharwar, Aravalli and Singhbhum; (2) geological and geochemical studies on the evidence for early life; and (3) deciphering the depositional environment and provenance of clastic sediments of the Dharwar Craton. Besides southern India, focused research studies in Bastar, Singhbhum and Bundelkhand cratons, Eastern Ghat Mobile Belt, Central Indian Tectonic Zone, Andaman Islands and Antarctica have yielded significant results that were published in recognised peer-reviewed National and International Journals. In addition to fundamental research, the Geochemistry Group has actively collaborated with industries like Hutti Gold Mines Limited (Hutti), Hindustan Zinc Limited (Udaipur) and National Mineral Development Corporation (Hyderabad) for the exploration of base metals and gold in different parts of the country. The analytical facilities created and developed by the Group are currently helping scores of researchers and students from a host of R&D organisations/ universities across the country and even a few organisations abroad in pursuing world-class geochemical and environmental research.

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A non-arc tectonic setting for the evolution of Archean gabbro anorthosite Complexes: Evidence from the Singhbhum Craton, eastern India

Cited by 9 publications

References 92 publications

Nature and origin of anorthosite enclaves within Proterozoic granite of Chotanagpur Granite Gneiss Complex of Eastern India

Nature and origin of anorthosite enclaves within Proterozoic granite of Chotanagpur Granite Gneiss Complex of Eastern India

Mineral chemistry, geochemistry and geophysical investigations of Simlipal volcanics from Eoarchean Singhbhum Craton (Eastern India): geodynamic implications of pervasive plume–lithosphere interaction

Geochemical Studies in India: CSIR-NGRI Contributions

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