Malampaya Sound Group : a Jurassic-Early Cretaceous accretionary complex in Busuanga Island, North Palawan Block (Philippines)

Late Mesozoic compressional folds in Dongsha Waters, the northern margin of the South China Sea

“…Mesozoic ophiolite-bearing metamorphic belts in central Taiwan Island (Ernst and Jahn, 1987) and Jurassic-Early Cretaceous accretionary complex in Busuanga Island, North Palawan (Zamoras and Matsuoka, 2001), were considered as fragmented traces of the subduction-related collision and/or suture tectonics on the easternmost margin of the South China Sea (Shu et al, 2002;Taylor and Hayes, 1983;Zamoras and Matsuoka, 2001). Thus, Dongsha Waters may have occupied an intermediate position between the Andean arc and the subductioncollision front.…”

Triassic 40Ar/39Ar ages from the Sakaigawa unit, Kii Peninsula, Japan: implications for possible merger of the Central Asian Orogenic Belt with large-scale tectonic systems of the East Asian margin

“…These are regarded as having formed along the East Asian continental margin to southwest of Taiwan as continuation of Tananao complex, starting in the Middle Jurassic Matsuoka 2001, 2004 and references therein). The easternmost of these subduction-accretion complexes has been correlated to the Southern Chichibu belt of the Outer Zone in Japan (Zamoras and Matsuoka 2001).…”

Upper Permian to Middle Jurassic radiolarian assemblages of Busuanga and surrounding islands, Palawan, Philippines

“…Faure & Ishida (1990) considered these rocks to be olistostromes. Zamoras (2001) and Zamoras & Matsuoka (2001) referred to the accretionary complex on Busuanga as the Malampaya Sound Group.…”

“…Several investigators considered the chert as part of the Liminancong Formation (Hashimoto & Sato 1973;Bureau of Mines and Geosciences 1984;Wolfart et al 1986;Zamoras 2001;Zamoras & Matsuoka 2001) and assigned various ages: Middle Triassic (Hashimoto & Sato 1973;Fontaine 1979;Wolfart 1984); Lower to Middle Jurassic (Bureau of Mines and Geosciences 1984) and Middle-Upper Permian to Upper Jurassic (Wolfart et al 1986;Isozaki et al 1988;Tumanda 1991a;1991b;Zamoras 2001;Zamoras and Matsuoka 2001). Japan International Cooperation Agency-Metal Mining Agency of Japan (1990) subdivided the chert into Liminangcong Chert (Triassic) and Busuanga Chert (Jurassic).…”

“…Several workers used the term Guinlo Formation for the clastic succession (Hashimoto & Sato 1973;Zamoras 2001;Zamoras & Matsuoka 2001). Wolfart et al (1986) subdivided the clastic rocks into the Coron Formation (Triassic) and the Guinlo Formation (Jurassic).…”