Magnetic Survey for Iron-Oxide-Copper-Gold (IOCG) and Alkali Calcic Alteration Signatures in Gadarwara, M.P, India: Implications on Copper Metallogeny
Abstract
:1. Introduction
2. Regional Geology
3. Methodology
3.1. Magnetic Survey
3.2. The Gadarwara Magnetic Anomaly
4. Results
4.1. Drilling Results
4.2. Magnetic Anomaly Modelling
5. Discussion
6. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Age | Group | |
---|---|---|
Recent | Alluvium (study area) | |
Pleistocene | Laterite | |
Eocene | Trap intrusions, dolerite dykes, | |
intertrappean beds, Deccan trap dikes, | ||
Deccan trap flows, Bagh beds, Lameta beds | ||
unconformity | ||
Lower Cretaceous | Gondwana | Upper Gondwana |
Upper Carboniferous | Lower Gondwanas | |
Lower Paleozoic | Vindhyan | Upper Vindhyans |
Upper Precambrian | Super Group | Lower Vindhyans |
Lower Proterozoic | Bijawar Group | Limestones, quartzites |
unconformity | ||
Archean | Granites, gneisses, schists and phyllites |
Depth (in mts) | Litho-Unit | Description |
---|---|---|
312 | BHJ | Dark brown to reddish brown in colour, intensely weathered and fractured, banded-hematite-jasper (BHJ), non-magnetic, specular hematite showing metallic lustre thin < 1 mm, fine grained jasper and hematite, soft yellow limonitic staining is noted at the fractured planes. The sulphides are pyrite, chalcopyrite and iron hydroxide like hematite. |
322 | Cherty IF | Weathered cherty iron bearing formation, the fine grained chert is hard and shiny lustre with sulphides and mostly pyrite, chalcopyrite and weathered staining on surface could be due leaching of iron oxides |
324 | Cherty IF | Weathered cherty iron bearing formation, the fine grained chert is hard and shiny lustre with sulphides and mostly pyrite, chalcopyrite and weathered staining on core surface. |
394 | Quartz + Carbonate | Dark brown to reddish brown in colour, intensely weathered and fractured, banded-hematite-jasper (BHJ), non-magnetic, specular hematite showing metallic lustre thin < 1 mm, fine grained. Due to intense weathering process the argillite’s are altered to clay and to limonitic ( yellow powdery nature) at carbonate show reactive nature with intense effervescence |
415 | CIF | Weathered cherty iron bearing formation, the fine grained chert is hard and shiny lustre with sulphides and mostly pyrite, chalcopyrite and weathered staining on surface could be due leaching of iron oxides. |
430 | Quartz | Fine grained quartz vein sample with saccharoiadal texture. |
450 | Shale | Grey to dark grey in colour, very fine grained, carbonate rock with calcite occurring as grey bands of sulphidic minerals and often as relict textures. Both fine bands of purple coloured minerals varying from white to purple green. |
467 | Carbonate + Calcite | Carbonate show reactive nature with intense effervescence with typical calcite texture perfect cleavage and conchoidal with brittle around with gentle hardness. |
480 | Carbonate + Calcite | Carbonate show reactive nature with intense effervescence with typical calcite texture perfect cleavage and conchoidal with brittle around with gentle hardness. |
481 | Calcite | Calcite typical texture with perfect cleavage and conchoidal with brittle around with gentle hardness. |
493 | Carbonate + Calcite | Carbonate show reactive nature with intense effervescence with typical calcite texture perfect cleavage and conchoidal with brittle around with gentle hardness. |
495 | Iron Formation | Dark brown to reddish brown in colour, intensely weathered and fractured, banded-hematite-jasper(BHJ), non-magnetic, specular hematite showing metallic lustre thin < 1 mm, fine grained jasper and hematite, soft yellow limonitic staining is noted at the fractured planes. The sulphides are pyrite, chalcopyrite and iron hydroxide like hematite. |
533 | Siltstone | Grey to dark grey in colour, very fine grained, carbonate rock with calcite occurring as bands with grey mineral and often as relict texture, fine bands of purple coloured mineral (carbonate-as it reacts with HCl), the colour of carbonates vary from white to purple and green; fractured. Magnetite (very fine-grained) crystals as fine zones, Pyrite, Chalcopyrite. |
545 | Siltstone | Grey to dark grey in colour, very fine grained, carbonate rock hard and fissile. The colour of carbonates vary from white to purple and green; fractured. Magnetite (very fine-grained) crystals as fine zones, Pyrite, Chalcopyrite. |
571 | Siltstone | Grey to dark grey in colour, very fine grained, carbonate rock with calcite occurring as bands with grey mineral and often as relict texture, fine bands of purple coloured mineral (carbonate—as it reacts with HCl), the colour of carbonates vary from white to purple and green; fractured. Magnetite (very fine-grained) crystals as fine zones, Pyrite, Chalcopyrite. |
581 | Siltstone | Grey to dark grey in colour, very fine grained, carbonate rock with calcite fractured. Magnetite (very fine-grained) crystals as fine zones, Pyrite, Chalcopyrite and other sulphides. |
610 | Shale | Dark grey to black in colour, hard, very fine grained shale with inter-layers of carbonate; well foliated, fine grains sulphides (pyrite) randomly oriented. |
610 | Shale | Dark grey to black in colour, hard, very fine grained shale with inter-layers of carbonate; well foliated, fine grains sulphides (pyrite) randomly oriented. |
Giant Ore Deposit | Type | Mineralisation | Alteration | Commodity | Orebody |
---|---|---|---|---|---|
Olympic Dam, Australia | Olympic Dam | Magnetite-hematite-bornite-chalcopyrite-breccia matrix | Potassic | Fe, Cu, Au, Ag, REE, U | Pipe like and irregular breccia |
Osborne, Queensland, Australia | Cloncurry | Magnetite-hematite-apatite replaced by Cu-Fe sulphides, Au etc. | Potassic | Cu, Au, Ag, Bi, Co, W | Stratabound vein, breccia |
Kiirunavaara, Sweden | Kiruna | Massive magnetite-apatite-actinolite | sodic | Fe ± Cu, Au | Tabular, pipe like, irregular |
Magnitogorsk, Urals, Russia | Iron skarn | Massive magnetite-garnet-pyroxene | Sodic | Fe ± Cu, Au | Stratabound lensoid, irregular |
Phalaborwa, South Africa | Phalaborwa | Magnetite, apatite, fluorite.Cu sulphides | Sodic + potassic | Cu, Au, Ag, REE, PGE, vermiculte, magnetite, P, U, Zr, Se, Te, Bi | Veins, layers, disseminations |
Bayan Obo, Mongolia, China | Bayan Obo | Magnetite, hematite, bastnaesite, Fe-Ti-Cr-Nb oxides, monazite | Weathering of Fe oxides | REE | disseminations |
Madhya Pradesh, Central India | Gadarwara | Magnetite, hematite, Cu-Fe, Au, monazite, apatite, zircon, sulphides | Sodic + potassic | Cu, Ni, Au, REE | Irregular breccia |
Western Bastar Craton, India | Thaneswasna | Magnetite, hematite, pyrite, arsenopyrite, chalcopyrite, monazite | Potassic | Fe-Cu-Ba-Au-Ag-Th | breccia |
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Raju, P.V.S.; Kumar, K.S. Magnetic Survey for Iron-Oxide-Copper-Gold (IOCG) and Alkali Calcic Alteration Signatures in Gadarwara, M.P, India: Implications on Copper Metallogeny. Minerals 2020, 10, 671. https://doi.org/10.3390/min10080671
Raju PVS, Kumar KS. Magnetic Survey for Iron-Oxide-Copper-Gold (IOCG) and Alkali Calcic Alteration Signatures in Gadarwara, M.P, India: Implications on Copper Metallogeny. Minerals. 2020; 10(8):671. https://doi.org/10.3390/min10080671
Chicago/Turabian StyleRaju, P.V. Sunder, and K. Satish Kumar. 2020. "Magnetic Survey for Iron-Oxide-Copper-Gold (IOCG) and Alkali Calcic Alteration Signatures in Gadarwara, M.P, India: Implications on Copper Metallogeny" Minerals 10, no. 8: 671. https://doi.org/10.3390/min10080671