Geochemical data and dating results from Mindoro, Philippines and their tectonic implications
Date Issued
2011
Date
2011
Author(s)
Chen, Huang-Lin
Abstract
The Mindoro is located between Palawan Continental Terrane and Philippine Mobile Belt. We collected the samples near the suture zones and conducted geochemical analysis and dating for these samples to discuss the affinity of suture zone. The basalts from the ophiolite belt show two different affinities. Some samples show the signature of E-MORB with LREE enrichment; meanwhile, the other sample exhibits N-MORB signature with LREE depletion. On the other hand, samples from NW part of the island show the OIB signature. The volcanic rocks, metamorphic rocks and sedimentary rocks from Mindoro metamorphics show characteristics of HFSE depletion, which infer those samples were products of island arc.
The volcanic samples from northwest Mindoro show that there were two major volcanic events in this area. First event was 250 Ma of U-Pb dating and hornblende Ar-Ar dating for granodiorite and diorite, respectively. This volcanic event can correlate with Permian magmatism occurred in South China. The U-Pb dating of rhyolite sample shows the thermal event record of 83 Ma, which may represent a local volcanic event. A date of 29 Ma was obtained from the amphibolite samples by hornblende Ar-Ar dating technique. It infers that a collision event occurred during this period. Fission track data show the exhumation age of Palawan Continental Terrane and Philippine Mobile belt from 5 Ma until 0.6 Ma.
Subjects
geochemistry
U-Pb dating, fission track dating
Ar-Ar dating
Mindoro
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