Laboratory measurements have been made on 162 granitoid samples for thermal conductivity, density, and porosity from the Singhbhum Craton in eastern India, one of the oldest cratons (3.53 Ga), which is surrounded by highly-rich mineralized belts. Study reveals that the thermal conductivity of co-eval Paleoarchaean granitoids depicts an increasing trend, statistically different at a 95 % confidence level, from north to south. This variation can be attributed to the relative abundances of major minerals and is corroborated by diverse nature of magma sources. Extensive coverage for thermal conductivity would help in robust estimates of heat flow for which plans are underway.
Figure: Mean thermal conductivity for the granitic rocks from various geo- logical provinces of Indian shield along with standard errror
Citation: Nishu Chopraa, Labani Raya,*, Sukanta Deyb, Aniruddha Mitrac
Geothermics 87 (2020) 101855