scholarly journals Bio-weathering of granites from Eastern Dharwar Craton (India): a tango of bacterial metabolism and mineral chemistry

2021 ◽  
Author(s):  
Arpitha Chikkanna ◽  
Devanita Ghosh ◽  
K. Sajeev
Keyword(s):  
Mineral Chemistry ◽  
Dharwar Craton ◽  
Bacterial Metabolism ◽  
Eastern Dharwar Craton

scholarly journals Bio-weathering of granites from Eastern Dharwar Craton (India): A tango of bacterial metabolism and mineral chemistry

2021 ◽  
Author(s):  
Arpitha Chikkanna ◽  
Devanita Ghosh ◽  
K. Sajeev
Keyword(s):  
Microbial Communities ◽  
Soil Formation ◽  
Distribution Patterns ◽  
Mineral Chemistry ◽  
Dharwar Craton ◽  
Total Protein Content ◽  
Eastern Dharwar Craton ◽  
Electron Microscopic ◽  
Interdisciplinary Approaches ◽  
Leaching Experiments

Abstract The bio-weathering process contributes majorly in the physical shaping of earth’s surface. The weathering of mineral is coupled to the formation of new minerals and release of bio-available nutrients for flora as well as microbial communities. Granites from the Eastern Dharwar Craton (EDC) India are felsic plutonic igneous rock composed of nutritive minerals. The major elemental composition of granite is such that, it forms an ancient ecological niche for diverse microbial communities. Interdisciplinary approaches were taken to construct a more comprehensive understanding of potential functional attributes of Actinobacteria in bio-weathering of granite. The paper includes molecular characterization of the isolated strains, detecting their granite bioweathering potentials through leaching experiments where Nocardioides showed highest mineral leaching indices with iron (Fe) being the most leached element (~ 6372 ppm). Scanning electron microscopic imaging indicated biofilm formation and Actinobacterial hyphae colonization. Petrographic, XRD and FTIR based study shows formation of secondary minerals [kaolinite, vermiculite and smectite]. To further establish the hypothesis of soil formation and nutrition transport, long-term (360 days) microcosm was developed. Deterioration and grain size alternations with increase in clay based minerals (kaolinite, vermiculite) and total protein content was observed. A bioinformatics based functional biodiversity approach in link to global bio-weathering of rocks by the genus Actinobacteria was adopted to understand their distribution patterns and contribution to alterations of rock minerals.

Dissecting through the metallogenic potentials of Precambrian granitoids: case studies from the Bastar and Eastern Dharwar Cratons, India

2019 ◽  
Vol 489 (1) ◽  
pp. 157-188 ◽  
Author(s):  
Dinesh Pandit ◽  
Sourabh Bhattacharya ◽  
Mruganka K. Panigrahi
Keyword(s):  
Genetic Model ◽  
Mineral Chemistry ◽  
Dharwar Craton ◽  
Critical Parameters ◽  
Geochemical Data ◽  
Eastern Dharwar Craton ◽  
Magma Evolution ◽  
Initial Water ◽  
Molybdenum Deposit ◽  
Available Information

AbstractThe Malanjkhand granodiorite in the Bastar Craton hosts a major copper (+ molybdenum) deposit. It represents a Precambrian granite–ore system lacking in key morphological features of porphyry-type deposits but is comparable as a chemical package with a distinct mode of evolution of the magmatic-hydrothermal system. Mineral chemistry of biotite and apatite along with bulk geochemical data constrain critical parameters such as initial water and halogen contents of the magma. Evolution of the magmatic-hydrothermal fluid has been envisaged with available thermobarometric data. A quantitative ore genetic model in terms of efficiency of removal of metals and resultant mineralization in terms of quantity of metals has been attempted for the Malanjkhand deposit. The Eastern Dharwar Craton witnessed prolific granitic activities in multiple phases during the Late Archean and are spatially close to auriferous schist belts. Against a widely held view of a single metamorphogenic origin of metal and ore fluid, a granite–gold connection can be visualized for the auriferous schist belts of the Eastern Dharwar Craton through comparison of fluid characteristics in the granitoid and ore regimes and mineral chemical constraints. Although a quantitative genetic link between the granitoid and gold would need more data, a magmatic component of the ore fluid could be established based on the available information.

PALEOMAGNETISM AND GEOCHRONOLOGY IN THE EASTERN DHARWAR CRATON

2017 ◽  
Author(s):  
Scott R. Miller ◽  
◽  
Joseph G. Meert ◽  
Anthony F. Pivarunas ◽  
Anup K. Sinha ◽  
...  
Keyword(s):  
Dharwar Craton ◽  
Eastern Dharwar Craton
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