| Braxton, D. P., Cooke, D. R., Ignacio, A. M., Rye, R. O., Waters, P. J. (2009) Ultra-Deep Oxidation and Exotic Copper Formation at the Late Pliocene Boyongan and Bayugo Porphyry Copper-Gold Deposits, Surigao, Philippines: Geology, Mineralogy, Paleoaltimetry, and their Implications for Geologic, Physiographic, and Tectonic Controls. Economic Geology, 104 (3) 333-349 doi:10.2113/gsecongeo.104.3.333 | Journal (article/letter/editorial) | Bayugo Porphyry Copper-Gold Deposits, Surigao, Philippines: Geology, Mineralogy, Paleoaltimetry, and their...American Exploration (Philippines) Inc. 21 Outlook Drive Baguio City, Philippines 2600 Abstract The Boyongan...the Surigao district of northeast Mindanao, Philippines. Exhumation and weathering of these Late Pliocene-age...supergene copper oxide minerals (malachite + azurite + cuprite) to deeper sulfide-stable assemblages (chalcocite...–5.7 per mil. At the latitude of the southern Philippines, this value corresponds to Pleistocene rain water | | | Report (issue) | Clark and others, 2007). In the thermal infrared region, quartz and hydrous silica contain emission minima...assemblage might include malachite + azurite + cuprite + chrysocolla, with minor amounts of other minerals...the magma is largely inherited from the source region (Carmichael, 1991). Other parameters, such as magma...and so forth) are also inherited from the source region. The compositional features and degree of magma...are assigned to the last intrusive event in the region (for example, host dacites evolving from cogenetic |
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