Terrane suturing, Mindoro, Philippines

Conference · Tue Jan 01 00:00:00 EST 1985 · Geol. Soc. Am., Abstr. Programs; (United States)

OSTI ID:5824253

Wynne, D B; McCabe, R; Mazzullo, J; Malicse, A

A middle to late Miocene suture zone (SZ) on Mindoro Island separates the older North Palawan Continental terrane (NPCT) (west) from the younger Central Philippine Arc Terrane (CPAT) (east). The SZ consists of mafic and ultramafic rocks and amphibolites thrust westward against slaty meta-sediments (NPCT). East of the SZ lies the East Mindoro Basin (EMB), separated from the SZ by the East Mindoro Fault Zone (EMFZ). Locally, topography and geology suggest normal motion on the EMFZ. However, in central Mindoro, topographic expression of the EMFZ is very diffuse and geologic map patterns are complex. Lithotectonic units and sequences are sometimes repeated and motion appears to have been multiphase. In the eastern central SZ, westerly thrust CPAT ( ) crystalline rocks are overlain by lower Pliocene shelfal limestone. This limestone contains both serpentinite pebbles and metamorphic, polcrystalline quartz grains near its base, thus constraining thrusting and terrane suturing to pre-Pliocene. 100 km NNW, at the town of Puerto Galera, the same relations are observed, although thrusting appears to have been SSW there. 100 km WNW of Puerto Galera, a northeast-dipping ophiolite on Ambil Island lies several km NE of slaty metasediments (NPCT ) on Luband Island. The authors suggest that these three ultramafic exposures represent western CPAT Basement, thrust westward against portions of the advancing NPCT.

• Research Organization: Texas A and M Univ., College Station (USA)
• OSTI ID: 5824253
• Report Number(s): CONF-8510489-
• Journal Information: Geol. Soc. Am., Abstr. Programs; (United States), Vol. 17; Conference: 98. annual meeting of the Geological Society of America, Orlando, FL, USA, 28-31 Oct 1985
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
GEOLOGIC FAULTS
GEOLOGIC MODELS
GEOLOGY
PHILIPPINES
PLATE TECTONICS
AMPHIBOLITES
BASEMENT ROCK
CONTINENTAL CRUST
LIMESTONE
MIOCENE EPOCH
TOPOGRAPHY
ASIA
CARBONATE ROCKS
CENOZOIC ERA
DEVELOPING COUNTRIES
EARTH CRUST
GEOLOGIC AGES
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
ISLANDS
METAMORPHIC ROCKS
ROCKS
SEDIMENTARY ROCKS
TECTONICS
TERTIARY PERIOD
580201* - Geophysics- Seismology & Tectonics- (1980-1989)
580100 - Geology & Hydrology- (-1989)