Geochemical variation of back-arc basin basalt and its genesis

Source Lithology and Magmatic Processes Recorded in the Mineral of Basalts from the Parece Vela Basin

“…Previous studies have shown that BABBs formed during the early stage of back arc extension are similar to island arc basalts, while BABBs formed during the late stage are similar to N-MORBs, indicating that as the back-arc basin evolves, the influence of the subduction components on the genesis of the BABBs gradually decreases (Gribble et al, 1998;Peate et al, 2001;Pearce and Stern, 2006). There are a large number of marginal basins and subduction zones in the western Pacific Ocean, making it an ideal place to study back-arc spreading and plate subduction (Yan and Shi, 2011;Shi and Yan, 2013;Yu and Chen, 2020). In addition, the Parece Vela Basin (PVB) is a back-arc basin that was formed during the second spreading epoch of the western Pacific Ocean, and it is significant to study the tectonic evolution of the Philippine Sea Plate (PSP) and the influence of the subduction components on the magmatic rocks in this back-arc basin (Karig, 1971;Hickey-Vargas, 1998;Okino et al, 1999;Hall, 2002;Tian et al, 2005;Shi and Yan, 2013;Yan et al, 2022).…”

“…The combination of a back-arc basin, trench, and island arc constitutes a trench-arc-basin system, which is an organic part of the active continental margin in the western Pacific region (Taylor and Martinez, 2003;Yu and Chen, 2020). Back-arc basin basalts (BABBs) are the product of partial melting of the mantle beneath a back-arc basin, and they can be used to study the deep processes in the mantle beneath the back-arc and the influence of subduction components (Gribble et al, 1998;Peate et al, 2001;Pearce et al, 2005;Pearce and Stern, 2006;Tian et al, 2021).…”