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Despite some controversy on the age of the small westernmost Huatung Basin (see Fig.

) demonstrated that symmetric spreading occurred on both sides of that feature, which was thus identified as a fossil spreading center and renamed the CBF rift.

(2) The initial splitting phase of the composite proto-PSP under the plume influence at 54–48 Ma led to the formation of the long-lived West Philippine Basin and short-lived oceanic basins, part of whose crust has been ambiguously called “fore-arc basalts” (FABs).

(3) Shortening across the paleo-transform boundary evolved into thrusting within the Pacific Plate at 52–50 Ma, allowing it to subduct beneath the newly formed PSP, which was composed of an alternance of thick Mesozoic terranes and thin oceanic lithosphere.

We compiled the most relevant data acquired throughout the Philippine Sea Plate (PSP) from the early expeditions to the most recent.

We also analyzed the various explanatory models in light of this updated dataset.

) is comparable to that of the Pacific Plate, which is presently the fastest plate in the world.(4) The first magmas rising from the shallow mantle corner, after being hydrated by the subducting Pacific crust beneath the young oceanic crust near the upper plate spreading centers at 49–48 Ma were boninites.Both the so-called FABs and the boninites formed at a significant distance from the incipient trench, not in a fore-arc position as previously claimed. in some places, probably near the intersections between back-arc spreading centers and the arc.The result was exposure of the FABs, boninites, and early volcanics that are near the trench today.(7) Serpentinite mud volcanoes observed in the Mariana fore-arc may have formed above the remnants of the paleo-transform boundary between the proto-PSP and the Pacific Plate.) during the Neogene, it is clear that the shape and area of the PSP has changed over time.

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