SIGNIFICANCE OF UNIAXIAL AND HYDROSTATIC-PRESSURE STUDIES ON ANCIENT OCEANIC ROCKS IN TECTONICS

Uniaxial studies are carried out on Indus suture zone rocks of Kashmir Himalaya, which are supposed to be dismembered ophiolites. The percen tage difference between the sonic and static determined Young's modulu s varies from 4% to 25%. Serpentinite showed the lowest value of compr essive strength (45 MPa) and pyroxenite gave the highest value (269 MP a), while meta volcanics exhibited narrow limits of 58 to 245 MPa. Sta ndard correlations were obtained for compressive strength to G/D ratio and for compressive strength to tensile strength. Standard correlatio ns for compressive strength to Young's modulus and compressive strengt h to maximum strain energy will bring our anomalous behavior; if any, of the different rock types, as well as the detection of weak zones. C ompressional wave velocity measurements were e carried out on all the samples of the sequence up to 10 kbar pressure by simulating the simil ar hydrostatic pressure conditions of oceanic crust, since the lacks a re supposed to represent the ancient oceanic crust (ophiolites). The r elationship between the number of cracks/m to compressional wave veloc ity have been established. These results can be compared with the dred ged samples of oceanic crustal lacks of other regions in drilling sinc e these studies are carried out in the same pressure conditions.