Ulrich Knittel, Ulrich Daniels; Sr-isotopic composition of marbles from the Puerto Galera area (Mindoro, Philippines): Additional evidence for a Paleozoic age of a metamorphic complex in the Philippine island arc. Geology ; 15 (2): 136–138. doi: https://doi.org/10.1130/0091-7613(1987)15<136:SCOMFT>2.0.CO;2
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The Sr-isotopic composition of marbles from the Puerto Galera area (Mindoro, Philippines) is compatible with either a Tertiary or a Paleozoic age. The former is considered as unlikely because nonmetamorphic sediments of that age overlie the metamorphic complex. This implies that the metamorphic complex does not represent the basement of the Philippine arc but is an accreted terrane.