Geochemistry and Origin of Early Proterozoic Dongargarh Rapakivi Granite Complex, Central India - An Example for Magma Mixing and Differentiation

Narayana, B. L.; Rao, J. Mallikharjuna; Rao, M. V. Subba; Murthy, N. N.; Rao, V. Divakara

doi:10.1016/s1342-937x(05)70757-7

Cited by 24 publications

(14 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some petrogenetic aspect of the DG was discussed by earlier workers (Deshpande et al, 1990;Narayana et al, 1995;Rao et al, 1997;Ramachandra and Roy, 1998;Divakara Rao et al, 2000). Earlier, Narayana et al (2000) suggested that DG comprises three distinct textural and compositional varieties such as porphyritic granodiorite, coarse equigranular granite, and microgranite/aplite containing rounded microgranular enclaves. The texture and mineralogy of these microgranular enclaves are similar to the enclaves found in MG (Kumar et al, 2004, Kumar andRino, 2006).…”

Section: Regional Geologymentioning

confidence: 91%

“…Overall, the MG plotted in the VAG field with minor affinity of Syn-COLG, whereas DG plotted in VAG and WPG fields with minor affinity to Syn-COLG, suggest that the parental magmas had evolved in a tectonic setting which shows the characters of volcanic arc (continental margin) and within plate granites. Naganjaneyulu and Santosh (2010) proposed that subductioncollision tectonics along the CITZ was a Mesoproterozoic event ($1.6 Ga) whereas the emplacement of Malanjkhand and Dongargarh granitoids were Palaeoproterozoic events (Panigrahi et al, 2004;Stein et al, 2004;Narayana et al, 2000). Two granitoid batholiths are N-S aligned along the Dongargarh-Kotri rift zone and coeval nature with the Nandgaon bimodal volcanism (Sensarma et al, 2002(Sensarma et al, , 2004.…”

Section: Trace Elementsmentioning

confidence: 99%

“…Singh et al (1997) reported a domal upwarp structure of the mantle beneath the granitoid batholith based on gravity data supports for extensional thinning of the crust or continental rift environment was there. All these evidences indicate that both granitoids were evolved in a tectonic environment, which may be partly orogenic and partly anorogenic probably in a continental margin (Yedekar et al, 1990;Krishnamurthy et al, 1990;Narayana et al, 2000). Divakara and Narayana et al (2000) provided various evidences of Paleoproterozoic continental rift environment in Central India, which may be the Barker (1979).…”

Section: Trace Elementsmentioning

confidence: 99%

“…Whole rock isochron studies using Rb-Sr, Sm-Nd, and Pb-Pb isotope ratios on the Dongargarh granitoids gave variable ages that range between 2.27 and 2.46 Ga (Sarkar et al, 1981;Krishnamurthy et al, 1988;Pandey et al, 1993). Various workers (Panigrahi et al, 1993(Panigrahi et al, , 2004(Panigrahi et al, , 2009Kumar and Rino, 2006;Narayana et al, 2000) have suggested that Malanjkhand and Dongargarh granitoids were derived from crustal sources and contemporaneous in age because their whole rock isochron ages overlap. In this paper, we present data on major, trace element (including REE) and mineral-chemical data from these two Paleoproterozoic granitoids from Central India located in the south of Central Indian Tectonic Zone (CITZ).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Comparative petrogenesis and tectonics of Paleoproterozoic Malanjkhand and Dongargarh granitoids, Central India

Pandit¹,

Panigrahi²

2012

Journal of Asian Earth Sciences

View full text Add to dashboard Cite

Section: Regional Geologymentioning

confidence: 91%

Section: Trace Elementsmentioning

confidence: 99%

Section: Trace Elementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparative petrogenesis and tectonics of Paleoproterozoic Malanjkhand and Dongargarh granitoids, Central India

Pandit¹,

Panigrahi²

2012

Journal of Asian Earth Sciences

View full text Add to dashboard Cite

“…The average modal composition of unaltered Degana Granite is given in Table 2. In the porphyritic granite, feldspars are present both as phenocrysts as well as in the matrix indicating that the interacting source magma was in partly crystalline state (Narayana et al, 2000). This is further supported by the corroded nature of K-feldspar megacrysts.…”

Section: Host Rock Characteristicsmentioning

confidence: 74%

Petrographic Characteristics and Alteration Geochemistry of Granite-hosted Tungsten Mineralization at Degana, NW India

Srivastava

2005

Resource Geology

View full text Add to dashboard Cite

Vein type tungsten mineralization at Degana is genetically and spatially associated with the Degana Granite. The deposit is characterized by pervasive wall rock alteration around the mineralized quartz veins. Laterally three different alteration zones, greisen, silicification and potassic zones, are marked based on the field features, mineral assemblages and geochemical characteristics. In the present paper, systematic mineralogical and chemical variation in these alteration zones is reported. Thick mono-mineralic (zinnwaldite) selvages around the veins characterize the deposit. Plagioclase and alkali feldspar are low in the greisen zones while K-feldspar shows more increase than plagioclase in the potassic zone. Quartz is uniformly high in all the alteration zones, but it shows an anomalous value in the silicification zone. Al 2 O 3 concentration shows initial depletion in greisen zone with gradual increase away from the contact. MgO and FeO are higher in greisen zone than silicification and potassic zones. The potassic zone is characterized by the depletion of Na 2 O and higher value of K 2 O.The common presence of topaz and fluorite as both primary and secondary minerals and fluorine-bearing micas suggest fluorine partitioning in substantial amount between granitic melt and coexisting aqueous fluid phase and higher HF activity during the evolution of hydrothermal fluid. The mutual relationship of the fluorine minerals (topaz and fluorite) in the different alteration zones suggests an increase in the Ca 2+ activity and decrease of H + activity during the fluid evolution from greisenization towards alkali-metasomatised granite and the fluid is assumed to change from low to high activity ratio of Ca 2+ /H + .

show abstract

Magma chamber processes and geodynamic implications of the Pithora pluton, Bastar Craton, Central India

et al. 2019

View full text Add to dashboard Cite

The interaction between the coeval mafic and felsic magmas result in mixing, mingling, and chemical exchanges between both the end‐member magmas. We document the features relevant to the magma chamber processes and quantify the extent of mixing by means of detailed field, petrographic, mineral, and whole‐rock geochemistry from one of the less known granitic plutons from the Pithora region that forms part of the Kanker granite, Bastar Craton. The study area is composed of granite, granodiorite (mixed zone), and quartz diorite microgranular enclaves (MEs). The occurrence of syn‐plutonic mafic dykes, cuspate contact, magmatic flow textures, and hybridization suggest the coeval emplacement of end‐member magmas. Petrographic evidence such as disequilibrium textures such as resorption, quartz ocelli, and spikes in plagioclase, acicular apatites, and mafic clots are formed by magma mixing. Plagioclase from MEs and the mixed region exhibit disequilibrium textures such as normal, reverse, and oscillatory zoning suggestive of magma mixing. Whole‐rock geochemical data indicates the metaluminous to peraluminous host granites and metaluminous ME. The broadly linear trend of geochemical variation diagrams for these granitoids and MEs showcase the hybridization of two end‐member magmas. The mineral chemistry of the biotites and hornblende show subduction affinity, being further constrained by whole‐rock trace elemental systematics. The granitoids of Pithora region were formed in a subduction setting where large‐scale mantle‐ and crustal‐derived magmas were generated and subsequently mixed at crustal emplacement level.

show abstract

Geochemistry and Origin of Early Proterozoic Dongargarh Rapakivi Granite Complex, Central India - An Example for Magma Mixing and Differentiation

Cited by 24 publications

References 24 publications

Comparative petrogenesis and tectonics of Paleoproterozoic Malanjkhand and Dongargarh granitoids, Central India

Comparative petrogenesis and tectonics of Paleoproterozoic Malanjkhand and Dongargarh granitoids, Central India

Petrographic Characteristics and Alteration Geochemistry of Granite-hosted Tungsten Mineralization at Degana, NW India

Magma chamber processes and geodynamic implications of the Pithora pluton, Bastar Craton, Central India

Contact Info

Product

Resources

About