Heavy Mo isotope composition of northern Bataan adakites, Philippines; evidence for fore-arc subduction erosion?

The identification of an eroded fore-arc crust component in arc magmas is challenging due to the combined effects of mantle metasomatism and crustal assimilation-fractional crystallization. In this study, molybdenum (Mo) isotope compositions are used in conjunction with Sr-Nd-Hf isotopic and element...

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Published in:	Geology (Boulder) 2023-01, Vol.51 (1), p.49-53
Main Authors:	Liu Haiquan, Liu Haiquan, Li Jie, Li Jie, Xu Yigang, Xu Yigang, Yumul, Jr, Knittel, Ulrich, Dimalanta, Carla B, Payot, Betchaida D, Queano, Karlo, Huang Xiaolong, Huang Xiaolong, Zhang Le, Zhang Le
Format:	Article
Language:	eng
Subjects:	adakites alkaline earth metals Amorong Group amphibole group Asia assimilation Ba/Nb Barium basalts basement Bataan Philippine Islands Cenozoic chain silicates Coexistence Crystallization Dehydration erosion Far East Fractional crystallization Garnet garnet group Geochemistry Geological processes Geology Geophysics hafnium igneous and metamorphic rocks igneous rocks Isotope composition Isotope ratios Isotopes Juveniles Lava Luzon Luzon Arc magmas Manila Trench mantle mantle wedges metals metasomatism mid-ocean ridge basalts Miocene Mo-98/Mo-95 Molybdenum Mount Balungao Mount Cuyapo Nb/Ta Neodymium Neogene nesosilicates Niobium North Pacific Northwest Pacific orthosilicates oxides Pacific Ocean partial melting Petrology Philippine Islands plate tectonics Pleistocene Quaternary Ratios Rutile silicates solid Earth (tectonophysics) South China Sea Sr-87/Sr-86 stable isotopes Strontium Subduction Subduction (geology) Subduction zones tantalum Tertiary Tracers volcanic rocks Volcanoes West Pacific
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Summary:	The identification of an eroded fore-arc crust component in arc magmas is challenging due to the combined effects of mantle metasomatism and crustal assimilation-fractional crystallization. In this study, molybdenum (Mo) isotope compositions are used in conjunction with Sr-Nd-Hf isotopic and elemental data to identify eroded fore-arc crust components in adakites from the Cuyapo and Balungao volcanoes of the northern Bataan segment of the Luzon arc (Philippines). The Mo isotopic ratios (δ98/95Mo, relative to the NIST SRM 3134 standard) of these adakites increase with increasing εNd (+4.3 to +5.6) and Ba/Nb (206-286). The low δ98/95Mo (-0.36 ppm to -0.26 ppm) in the Cuyapo adakites coupled with low Sr-Nd-Hf isotopic ratios suggests contributions from the residual slab, which lost isotopically heavy Mo during dehydration. Interestingly, the high δ98/95Mo (-0.18 ppm to 0.00 ppm) Balungao adakites have Mo-Sr-Nd-Hf isotopic ratios similar to those of the Luzon basement. Fractionated Nb/Ta (16-18) and high Sr/Y indicate the coexistence of melt with residual rutile and garnet ± amphibole assemblages, corresponding to a source region (>∼45 km) below the present Luzon crust (∼33 km). This thus suggests an origin of heavy Mo from partial melting of eroded crust in the mantle wedge rather than in the upper-plate crust. Our work not only demonstrates that Mo isotopes may be a potential tracer of eroded crust but also highlights that lavas with combined high δ98/95Mo, εNd, and Ba/Nb emplaced at subduction zones with juvenile arc crust may be a result of subduction erosion.
ISSN:	0091-7613 1943-2682