Defining the South Central Cordillera (Luzon)
Transtensional Strip: implications to mineral occurrences



Dr. Mario A. Aurelio and the Philex Mining Corp. Exploration Team


Extended Abstract


A transtensional strip more than 50 km long and about 25 km wide is defined between La Trinidad and Ansagan, Tuba, Benguet on the southern half of the Luzon Central Cordillera. Elongated along a NNW-SSE axis, this tectonic strip is bounded by left-stepping branches of the left-lateral Philippine Fault System in Luzon. It is bounded to the west by the Pugo Fault and to the east by the Tebbo Fault. At the regional scale, this transtensional zone is dominated by NE- to E-trending faults with strong indications of normal fault movements. Microtectonic analysis of fracture and mineral vein systems indicates strong conformity with the regional structural direction. Computed least stress axis s 3 directions are oriented N165 on the average, sub-parallel to the strike of the bounding faults. The existence of known mineral deposits (e.g. Antamok, Thanksgiving, Santo Tomas) and prospects (e.g. Butan, Ansagan) within the tectonic strip implies an intimate relationship between transtension and mineral occurrence.


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