Bulletin of the Geological Society of Malaysia, Volume 13, Dec. 1980, pp. 43 – 55
Geomex Surveys, Angkasa Raya, Jalan Ampang, Kuala Lumpur
Abstract: Qualititive analyses of a ground magnetic survey suggest that the complex magnetic anomalies occurring in the Kedah Peak Rest House area are due to
(1) near-surface magnetite veins occurring at the vicinity of the Rest House, and,
(2) larger magnetite bodies at estimated depths of 90 to greater than 250 m.
These magnetic sources at depth are thought to be magnetite concentrations within the quartz porphyry itself or at the contact with the metasediments of the Jerai Formation. The quartz porphyry is regarded as an apophysis of the main igneous body which is endomorphosed on solidification before the main processes of intrusion are completed. The natural escape route for the mineralising fluid (high Fe-Content silicic differentiates from the magma chamber) would be the sheared quartz porphyry rather than the metasediments. Occurrence of magnetite in the metasediments result from replacement processes rather than primary ore deposition.