scholarly journals SHRIMP U–Pb zircon ages of granitoids adjacent to Chitradurga shear zone, Dharwar craton, South India and its tectonic implications

2015 ◽  
Vol 110 (5) ◽  
pp. 224-234 ◽  
Author(s):  
Abdulla NASHEETH ◽  
Takamoto OKUDAIRA ◽  
Kenji HORIE ◽  
Tomokazu HOKADA ◽  
Madhusoodhan SATISH–KUMAR
Keyword(s):  
Shear Zone ◽  
South India ◽  
Dharwar Craton ◽  
Tectonic Implications

The Role of a Transcrustal Shear Zone in Orogenic Gold Mineralization at the Ajjanahalli Mine, Dharwar Craton, South India

2004 ◽  
Vol 99 (4) ◽  
pp. 743-759 ◽  
Author(s):  
J. Kolb ◽  
A. Hellmann ◽  
A. Rogers ◽  
S. Sindern ◽  
T. Vennemann ◽  
...  
Keyword(s):  
Shear Zone ◽  
South India ◽  
Gold Mineralization ◽  
Dharwar Craton ◽  
Orogenic Gold ◽  
Orogenic Gold Mineralization

scholarly journals Constraints on the origin of south indian magnesite deposits

2002 ◽  
Vol 50 ◽  
Author(s):  
V. PRASANNAKUMAR
Keyword(s):  
Shear Zone ◽  
South India ◽  
Dharwar Craton ◽  
Temporal Relations ◽  
Early Proterozoic ◽  
Pan African ◽  
South Indian ◽  
Rich Solution

Most of the magnesite deposits in South India are confined to the southern part of the Dharwar craton and are associated with the ultramafics emplaced into the older supracrustal rocks. The major mineralisation is located in a shear zone that separates the Early Proterozoic and Pan-African granulites. The timing of mineralisation and the source of carbon for the various magnesite deposits of South India are points of debate. Temporal relations of deformation, metamorphism, incipient charnockitisation and mineralisation in the shear zone have been analysed. On the basis of the CO 2 influx, which favoured the formation of incipient charnockites, it is presumed that a juvenile CO 2 rich solution might have significantly contributed to the source of carbon for magnesite mineralisation. The present study attributes the timing of magnesite mineralisation to Pan-African time.

Archaean stromatolites from the Chitradurga schist belt, Dharwar Craton, South India

1989 ◽  
Vol 43 (3) ◽  
pp. 239-250 ◽  
Author(s):  
R. Srinivasan ◽  
Manoj Shukla ◽  
S.M. Naqvi ◽  
V.K. Yadav ◽  
B.S. Venkatachala ◽  
...  
Keyword(s):  
South India ◽  
Dharwar Craton ◽  
Schist Belt

scholarly journals Magnetotelluric investigation of lithospheric electrical structure beneath the Dharwar Craton in south India: Evidence for mantle suture and plume-continental interaction

2019 ◽  
Vol 10 (5) ◽  
pp. 1915-1930 ◽  
Author(s):  
D. Malleswari ◽  
K. Veeraswamy ◽  
K.K. Abdul Azeez ◽  
A.K. Gupta ◽  
Narendra Babu ◽  
...  
Keyword(s):  
South India ◽  
Dharwar Craton ◽  
Electrical Structure

Deformation-driven emplacement-differentiation in the Closepet pluton, Dharwar Craton, South India: an alternate view

2019 ◽  
Vol 489 (1) ◽  
pp. 261-274 ◽  
Author(s):  
Abhijit Bhattacharya
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
South India ◽  
Major Element ◽  
Volume Fraction ◽  
Dharwar Craton ◽  
The North ◽  
Magmatic Fabric ◽  
Melt Composition ◽  
Crystal Content

AbstractIn the Late Archean north-trending Closepet pluton, trains of euhedral K-feldspar phenocrysts and matrix-supported idiomorphic K-feldspar crystals in the central part of the pluton define oblique-to-pluton margin steep-dipping east/ENE-trending magmatic fabrics. The magmatic fabric is defined by phenocryst-rich and phenocryst-poor layers, with the euhedral porphyries continuous across the layers. The fabrics are near-orthogonal to the gently-dipping gneissic layers in the host gneisses. The fabrics curve adjacent to locally-developed north/NNE-trending melt-hosted dislocations parallel to the axial planes of horizontal/gently-plunging north-trending upright folds in the host gneisses. In the pluton interior, both fabrics in the intrusives formed at supra-solidus conditions, although the volume fraction of melts diminished drastically due to cooling/melt expulsion. At the pluton margin, the north-trending fabric is penetrative and post-dates magma solidification. Within the pluton, the major element oxides, rare earth elements, anorthite contents in plagioclase, and (Mg/Fe + Mg) ratios in biotite decrease with increasing SiO2 from phenocryst-rich (up to 75% by volume) granodiorite to phenocryst-poor (<15 vol%) granite that broadly correspond to minimum melt composition. The chemical-mineralogical variations in the pluton is attributed to deformation-driven ascent of magma with heterogeneous crystal content, ascending at variable velocities (highest in crystal-poor magma) along oblique-to-pluton margin east/ENE-trending extensional fractures induced by dextral shearing.

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