Skip to main content

Advertisement

Table 1 List of samples collected in the PSP providing evidence for a pre-Eocene proto-PSP

From: Philippine Sea Plate inception, evolution, and consumption with special emphasis on the early stages of Izu-Bonin-Mariana subduction

Region (see n° in Fig. 3) Sample location Sample nature and dated material Estimated age Source
Izu-Bonin fore-arc    
1 Dive samples (YK11-07) 32° 14' N–141° 39' E Andesite, diorite Cretaceous ~100 Ma (U-Pb) + Paleozoic and Proterozoic detrital zircons Tani et al. 2012
Tani and Myojinsho 2011
2 Sample 6 K1152 27° 19' N– 143° 00' E Two pillow basalt lavas beneath gabbro Middle Jurassic 159.4 ± 0.9 Ma (40Ar/39Ar) Ishizuka et al. 2011b
Ishizuka et al. 2012
Mariana fore-arc    
3 Site 460, DSDP 60 17° 40' N–147° 35' E Pebble conglomerate with Calpionella alpina Late Jurassic to Early Cretaceous (~130–140 Ma) Azéma and Blanchet 1981
3 Site 460 17° 40' N–147° 35' E Reworked radiolarians Upper Cretaceous (Campanian, ~72–83 Ma) Hussong and Uyeda 1981
3 Site 461 17° 46' N–147° 41' E Reworked radiolarians “Cretaceous” (~65–135 Ma) Hussong and Uyeda 1981
4 Dredges 19° 37' N–147° 04' E Radiolarian cherts Lower Cretaceous Valanginian ~97–112 Ma and Albian 131–138 Ma Johnson et al. 1991
4 Dredges 19° 37' N–147° 04' E Foraminifers in cherts Lower Cretaceous (Aptian to Albian ~96–113 Ma) Johnson et al. 1991
4 Dredges 19° 37' N–147° 04' E MORB metabasalt Upper Cretaceous 85 Ma (K-Ar) Johnson et al. 1991
4 Dredges 19° 37' N–147° 04' E Highly metamorphosed alkali basalt Upper Cretaceous 71 Ma (K-Ar) Johnson et al. 1991
WPB     
5 Site 290 east of KPR 17° 44' N–133° 28' E Reworked foraminifers in a volcaniclastic apron Cretaceous Ingle et al. 1975
KPR     
6 Dredge in southernmost part of KPR on a ridge between Palau Trench and KPR Mafic schists of amphibolite to greenschists facies May have similar age and origin to Cretaceous Daito Ridge Ishizuka et al. 2012
ADO region     
7 Dive samples (YK10-04) Gabbroic, granitic and metamorphic rocks Jurassic to Cretaceous magmatic zircons Tani et al. 2012
Tani 2010
25° 54' N–133° 54' E
27° 53' N–131° 51' E
27° 56' N–132° 02' E
Amami Plateau
7 Dredge 11-17-1 28.07° N–131.63° E Hornblende tonalite Lower Cretaceous 69.5 Ma (K/Ar)–117.0 ± 1.1 Ma (40Ar/39Ar) Matsuda et al. 1975
Tokuyama 1985
Hickey-Vargas 2005
7 Dredge 11-17-5 28.08° N–132.02° E Hornblende tonalite Lower Cretaceous 75.1 Ma (K/Ar)–115.8 ± 0.5 Ma (40Ar/39Ar) Matsuda et al. 1975
Tokuyama 1985
Hickey-Vargas 2005
7 Dredge 11-9-33 Basalt Upper Cretaceous 82.4 and 85.1 Ma (K/Ar) Matsuda et al. 1975
Tokuyama 1985
Daito Ridge
8 Short core or dredge ~25.9° N–135.2° E Andesite Lower Cretaceous 116.9 ± 0.9 Ma (40Ar/39Ar) Ishizuka et al. 2011a
9 Short core or dredge ~26.0° N–133.1° E Andesite Lower Cretaceous Ishizuka et al. 2011a
118.9 ± 0.4 Ma (40Ar/39Ar)
Oki-Daito Ridge
10 Dredge (unknown exact location) Alkali basalt Limit Upper Cretaceous-Paleocene 65 Ma Okino and Kato 1992
Huatung Basin     
11 Dredged sample RD19 20.40° N–121.47° E Gabbro Lower Cretaceous Deschamps et al. 2000
121.2 ± 4.6 Ma (40Ar/39Ar)
12 Dredged sample RD20 21.49° N–122.69° E Gabbro Lower Cretaceous Deschamps et al. 2000
123.2 ± 7.8 Ma (40Ar/39Ar)
13 YehYu Creek sample on Lanyu Island 22° N–121.55° E Red chert float radiolarian Lower Cretaceous (Barremian ~113–117 Ma) Deschamps et al. 2000
Philippine archipelago    
14 Outcrops Ophiolitic suites Cretaceous Yumul 2007