Anisotropy of magnetic susceptibility and petrofabric studies in the Garhwal synform, Outer Lesser Himalaya: Evidence of pop-up klippen

作者：Devrani Upasana^*; Dubey Ashok K

来源：Island Arc, 2009, 18(3): 428-443.

DOI：10.1111/j.1440-1738.2008.00628.x

• fault reactivation
• Himalayan seismicity
• neotectonic stress
• strain
• superimposed deformation

P>Geological field, petrographic, and anisotropy of magnetic susceptibility studies help in understanding the evolutionary history of the Garhwal synform that lies in the western Outer Lesser Himalaya. Orientations of the magnetic susceptibility axes reveal large variations at short distances as a result of superimposed deformation, and predominant stress conditions favorable for normal faulting. Rocks forming the outer limbs of the Garhwal Synform are metamorphosed up to the lower greenschist facies. The metamorphic grade increases to chlorite zone in the inner limb and the core is characterized by chlorite-biotite to garnet zones. The different grades of metamorphism are separated by thrusts and the structure is described as a pop-up klippen.

• 出版日期2009-9