| Popis: |
The trending of Rondonom trust fault zone can be traced on three locations, namely the NE –SW trust fault trend in Rondonom, the NE – SW trend in Padasan village and Grabahan hill, and the NE – SW trend in Konang hill. Girisono fault zone was firstly mentioned as Girisono thrust fault on Regional Geoheritage Conference 2019, show evidence for two successive structure episodes. The first generation (D1) is deformation in northern part of Jokotuwo hill to the Rondonom hill. This zone is manifested by a variety of structures for well-developed mylonite foliations and mostly associated with recumbent minor, chevron, and superposed fold. The second generation (D2) of deformation is in southern part of Jokotuwo – Rondonom hills to southern part of Semangu hill. This zone is manifested by shearing structure for foliation cataclasite flow and associated with swelly or scalyclay structure, and sometime with chevron fold. The earliest structures in the Eastern Jiwo hill was generally showed that D1 structures are rotational and non-coaxial in semi-ductile character. The deformation was dextral thrusting involving NW shortening with a significant component of thrust-parallel slip movement that continued into the Pra-Tertiary Orogeny. The D2 was dextral thrusting compression involving E-W shortening with significant of thrust-parallel slip movement that continued into Late Eosen or Paleogen Orogeny. |
