Western Northern Luzon Isotopic Evidence of Transition From Proto‐South China Sea to South China Sea Fossil Ridge Subduction

Western Northern Luzon Isotopic Evidence of Transition From Proto‐South China Sea to South China Sea Fossil Ridge Subduction

Temporal geochemical comparisons are conducted for representative magmatism from western Northern Luzon to reconstruct the Cenozoic tectonics. Oligo‐Pleistocene magmas from western Northern Luzon display elemental and Sr‐Nd‐Hf‐Pb‐O isotope geochemistry similar to intraoceanic arc magmatism, consiste...

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Veröffentlicht in:Tectonics (Washington, D.C.) D.C.), 2020-02, Vol.39 (2), p.n/a
Hauptverfasser: Liu, Hai‐Quan, Yumul, Graciano P., Dimalanta, Carla B., Queaño, Karlo, Xia, Xiao‐Ping, Peng, Tou‐Ping, Lan, Jiang‐Bo, Xu, Yi‐Gang, Yan, Yi, Guotana, Juan Miguel R., Olfindo, Valerie Shayne
Format: Artikel
Sprache:eng
Schlagworte:
Arc‐continent collision
Basalt
Cenozoic
Crystallization
Fluids
Fossils
Geochemistry
Isotope composition
Isotopes
Lava
Luzon Arc
Magma
Mantle
Miocene
Oceanic crust
Palaeomagnetism
Paleomagnetism
Pelagic sediments
Pleistocene
Proto‐South China Sea
Ratios
Ridge subduction
Scarborough Seamount Chain
Seamounts
Sediments
South China Sea
Strontium isotopes
Subduction
Tectonics
Temporal variations
Terrigenous sediments
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Zusammenfassung:Temporal geochemical comparisons are conducted for representative magmatism from western Northern Luzon to reconstruct the Cenozoic tectonics. Oligo‐Pleistocene magmas from western Northern Luzon display elemental and Sr‐Nd‐Hf‐Pb‐O isotope geochemistry similar to intraoceanic arc magmatism, consistent with derivation from the mantle wedge, coupled with fractional crystallization. Specifically, the Oligo‐Miocene (~26.8–15.6 Ma) Central Cordillera diorite complex samples exhibit a negative correlation between Sr‐Nd isotopes, consistent with mantle metasomatism by fluids/melts released from pelagic sediments. The Mio‐Pleistocene samples (~9 Ma) magmatism exhibit intraoceanic arc isotopic signatures, suggestive of a chemical imprint from subducted pelagic sediments. The Mio‐Pleistocene (
ISSN:0278-7407
1944-9194
DOI:10.1029/2019TC005639