Variation in rock fabric with depth in the upper 1 km of the earth’s crust and its implications for mineralization.
M.Sc. Ritwik Chakraborty
Structural control on fluid flow and mineralization is well-known in geosciences. Many of the mineral deposits are spatially associated with shear zones and hydrothermal veins formed in response to the regional stress field and related kinematics. Any study that enhances our understanding of the variation in fabric, porosity and permeability with depth can provide geoscientists with useful information to better appreciate structural control on vein formation and mineralization. In this study, analysis of rock fabric, its anisotropy, as well as porosity and permeability in metapelitic rocks from the vicinity of the Singhbhum Shear Zone (eastern India) is being performed. A combination of various techniques is used to analyse physical properties and identify the fabric in the samples from different depths viz. (a) ultrasonic P-wave velocity (Vp) measurements, (b) X-ray micro-CT followed by porosity and permeability calculations, (c) anisotropy of magnetic susceptibility (AMS) measurements and (d) SEM-EBSD. It is envisaged that this multi-method approach will help better understand the control of the above properties on mineralization.