Geology of the Zambales Range, Luzon, Philippine Islands: Ophiolite Derived from an Island Arc‐Back Arc Basin Pair James W. Hawkins Geological Research Division, Scripps Institution of Oceanography, La Jolla, California 92093 evolution of the Zambales Ophiolite Complex. Field Trip A field trip to the ZOC was organized by the SEG Philippine Student Chapter to visit rock units of the Zambales Ophiolite Complex (ZOC) and the associated podiform chromite mineralization (Figure 2). Ophiolites are sequences of mafic to ultramafic rock generally believed to represent ancient oceanic lithosphere.They are distributed all across the world being all of them located at present or past orogenic belts, sites of mountain building processes.. Ophiolites are common in orogenic belts of Mesozoic age, like those formed by the closure of the Tethys Ocean. Geochemi-cal studies showed that the Masinloc massif consists of two blocks—the Acoje and Coto. Geology 2.1. The chromitites occur close to the peridotite/gabbro transition zone. The chromite orebodies are structurally classified into three major types: (1) concordant tabular deposits, (2) strings of pods and (3) pocketlike deposits. 2. exploration targets in the ophiolite complex. Geologic outline of the Zambales Ophiolite Complex The Eocene ZOC is a north-south trending, east dip-ping complete ophiolite suite composed of residual harzburgite and lherzolite, transition zone dunite, layered ultramafic and … the Zambales Ophiolite Complex (adopted from Yumul, 2001). The chromitite-bearing peridotites of the Zambales mafic-ultramafic complex form the lowermost level of the Zambales ophiolite, which exposes a complete ophiolitic sequence. Whether it is active or not will also be important to know. An ophiolite is a section of Earth's oceanic crust and the underlying upper mantle that has been uplifted and exposed above sea level and often emplaced onto continental crustal rocks.. - 25635916 2. Hawkins & Evans 1983). CONCLUSIONS The present day configuration of the Zambales Ophiolite Complex can be explained with the recognition of the role played by the Subic Bay Fault … ophiolite rock complex was exposed in Zambales in western Luzon, how does an oceanic crust uplift in a landform like zambales? The Zambales Ophiolite Complex (ZOC) located in Luzon, Philippines is a SSZ ophiolite (e.g. The structural and age relationships between Outcrops of the crustal section of the ZOC in Subic, Zambales were examined. The Two basement terranes, the Zambales ophiolite in the west, and the Angat ophiolite in the east, are exposed on the island of Luzon, separated by a circa 10 km thich and circa 100 km wide sedimentary basin. The Greek word ὄφις, ophis (snake) is found in the name of ophiolites, because of the superficial texture of some of them.Serpentinite especially evokes a snakeskin. Two basement terranes, the Zambales ophiolite in the west, and the Angat ophiolite in the east, are exposed on the island of Luzon, separated by a circa 10 km … The ophiolite is made up of three fault-bounded massifs—Masinloc, Caban-gan and San Antonio (Fig.1, Inset A). . Geology and geochemistry of the Zambales Ophiolite Complex 2.1.
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