Geology and fault analysis of Pos Blau, Gua Musang, Kelantan

Fault analysis is the study on the deformation of the rock with respect to their stress. To determine the deformation especially fault that inherited from Bentong-Raub Suture Zone, a research was conducted at Pos Blau, Gua Musang, Kelantan as there is no comprehensive geology and fault analysis of the study area from previous research. The study area is in a square box shape with 25km2. The objectives of this research are to produce geological map of the study area with the scale of 1:25,000 and to analyse the faults present in the study area by dynamic and kinematic analysis. The primary goal of the analysis is to use the measurements of present day rock geometries to discover information about the history of the rocks and to understand the stress field that produce the structures observed in the study area in present day. The methodology used to conduct the research include field study, laboratory work which are thin section preparation and petrographic analysis, data processing by using ArcGis 10.2, Stereonet Software and GeoRose. The lithologies that were found in the study area includes schist, tuff, clastic sediment rock; shale, mudstone, sandstone, chert, conglomerate and thick bedded limestone. The oldest lithology identified is schist that aged Pre-Mesozoic while the youngest lithology is thick bedded limestone that was formed during Late Triassic. Two deformations were identified in the study area which are major thrust fault named as Blau Thrust Fault and Brooke Strike-Slip Fault that caused by the ESEWNW principal stress. The principal stress direction was gained from joint analysis from field study, this corresponds to the major principal stress of the Bentong-Raub Suture Zone formation due to the collision of Sibumasu and Indochina blocks in the Late Palaeozoic and Triassic. Study on faults in Pos Blau area provide better understanding on the rock deformation related to the dynamic and kinematic analysis.