Publication Type:
Journal ArticleSource:
Terra Nova, John Wiley & Sons, Ltd, Volume n/a, Number n/a (2025)ISBN:
0954-4879URL:
https://onlinelibrary.wiley.com/doi/10.1111/ter.12771Keywords:
forearc setting, intra-oceanic subduction, Kohistan island arc, Pakistan, subduction initiationAbstract:
<p>ABSTRACT Subduction zones play a crucial role in Earth's physical and chemical dynamics, but their initiation and related magmatism remain poorly understood. This study presents new zircon U?Pb age, Hf?O isotope and whole-rock major?trace element and Sr?Nd isotope data from the Kohistan arc in northern Pakistan, a well-preserved Phanerozoic oceanic crustal arc. The Jaglot Group basalts are low-K tholeiites similar to early Izu?Bonin?Mariana forearc basalts, representing the oldest volcanic stratigraphy of the Kohistan arc. The Matum Das tonalite, intruding the Jaglot Group at ~155?Ma, provides a new minimum age for subduction initiation. The rapid formation of new felsic crust shortly after subduction initiation challenges existing models and indicates the need for further research into early arc-forming processes.</p>
