Dear colleagues, I need a full list of Indian greenstone belts. Preferably, craton wise name list will be of immense help. Please let me know what is the difference between greenstone belt, schist belt and supracrustals.
The difference between these terms is mainly compositional and a question of detail. A supracrustal belt is a very general term meaning any belt or sequence of rocks that has been laid down upon older crustal basement, in other words pretty much any volcano/sedimentary sequence, whatever the age and whatever the compositional makeup. It can apply to areas of low deformation and metamorphism, but is generally used in deformed or orgenic terranes. A schist belt is also a very general term, not used very much these days, which signifies a belt or package of deformed (schistose) volcanosedimentary rocks in an orogenic setting - it can include large proportion of clastic sedimentary rocks like greywackes and argillites. A greenstone belt is more specifically a belt or package of mafic-ultramafic volcanic, intrusive or volcanosedimentary rocks, generally metamorphosed at greenschist or amphibolite facies (hence, dominance of amphiboles, chlorite, epidote, serpentine and other green minerals). It is often used when dealing with Archaean or Palaeoproterozoic volcanosedimentary belts within the main shield areas of the world, but in fact there are similar belts throughout earth history.
As for the Indian greenstone belts, I am not so familiar with them - you can try looking online with a search engine. The chapter in de Wit and Ashwal's Greenstone Belt book (1997, Oxford Science Publications) might be a good start - Rogers J J W and Giral R A, 1997, The Indian Shield, chapter 5.10). I'll try tp summarize here, as it may be difficult to get hold of:
Aravalli Craton - Delhi Belt; Aravalli Supergroup, Bhilwara belt
Western Dharwar craton - Sargur belt; Dharwar supracrustals (includes Shimoga, Sandur, Western Ghats, Kudremukh, Chitradurga, Bababudan, Nuggihalli, Holenarasipur, Krishnarajpet.
These are variously described as schist belts or greenstone belts depending on the proportions of mafic volcanic versus siliciclastic sedimentary rocks, or just simply as supracrustals. I am no expert on the Indian shield, so I do not know if these names for the various belts are still current, or if there are other names that they used to go by in the past.
The difference between these terms is mainly compositional and a question of detail. A supracrustal belt is a very general term meaning any belt or sequence of rocks that has been laid down upon older crustal basement, in other words pretty much any volcano/sedimentary sequence, whatever the age and whatever the compositional makeup. It can apply to areas of low deformation and metamorphism, but is generally used in deformed or orgenic terranes. A schist belt is also a very general term, not used very much these days, which signifies a belt or package of deformed (schistose) volcanosedimentary rocks in an orogenic setting - it can include large proportion of clastic sedimentary rocks like greywackes and argillites. A greenstone belt is more specifically a belt or package of mafic-ultramafic volcanic, intrusive or volcanosedimentary rocks, generally metamorphosed at greenschist or amphibolite facies (hence, dominance of amphiboles, chlorite, epidote, serpentine and other green minerals). It is often used when dealing with Archaean or Palaeoproterozoic volcanosedimentary belts within the main shield areas of the world, but in fact there are similar belts throughout earth history.
As for the Indian greenstone belts, I am not so familiar with them - you can try looking online with a search engine. The chapter in de Wit and Ashwal's Greenstone Belt book (1997, Oxford Science Publications) might be a good start - Rogers J J W and Giral R A, 1997, The Indian Shield, chapter 5.10). I'll try tp summarize here, as it may be difficult to get hold of:
Aravalli Craton - Delhi Belt; Aravalli Supergroup, Bhilwara belt
Western Dharwar craton - Sargur belt; Dharwar supracrustals (includes Shimoga, Sandur, Western Ghats, Kudremukh, Chitradurga, Bababudan, Nuggihalli, Holenarasipur, Krishnarajpet.
These are variously described as schist belts or greenstone belts depending on the proportions of mafic volcanic versus siliciclastic sedimentary rocks, or just simply as supracrustals. I am no expert on the Indian shield, so I do not know if these names for the various belts are still current, or if there are other names that they used to go by in the past.
Sir this is a very nice answer and I would really like to express my sincere thanks for this exact answer. I would definitely be grateful if you attach those references mentioned if these are available with you.
Prof. Jayananda, Prof. Manikyamba, Prof. Balakrishnan, Dr. Maya, Dr. Sukanta Dey, Dr. Chandan Kumar and Rajamanikam these are the researchers who have contributed to our understanding. Most of the papers you can find it in Research gate.