Mesozoic granitoids in Peninsular Malaysia provide crucial information on the temporal–spatial relationship between the Tethyan and Palaeo-Pacific domains. This paper presents new ages and geochemical data for newly identified Jurassic–Cretaceous granites and meta-granites from East Malaya. These granitoids can be divided into three groups. Group 1 consists of high-K calc-alkaline granites and granodiorites (171–162 Ma) with variable εNd(t) values of −7.4–+0.5, zircon εHf(t) values of −7.4–+8.6, and high initial ratios for 206Pb/204Pb (20.04–20.65), 207Pb/204Pb (15.73–15.79) and 208Pb/204Pb (39.80–40.20). The melting of metasedimentary rocks with a juvenile mafic component formed Group 1 samples. Group 2 granite porphyries (c. 131 Ma) with A-type affinities and Group 3 granitic gneisses (c. 130 Ma) with I-type affinities share similar εNd(t) values (−7.2 to −5.5), zircon εHf(t) values (−10.1–+6.5), and initial ratios for 206Pb/204Pb (18.81–19.02), 207Pb/204Pb (15.71–15.77) and 208Pb/204Pb (38.95–39.59). Although Group 2 and 3 samples were derived from an ‘ancient’ meta-mafic source region, Group 2 shows evidence for the involvement of a juvenile mafic component. All these granitoids are akin to the Permian–Triassic igneous rocks in East Malaya. The Jurassic–Cretaceous igneous rocks in Eastern Peninsular Malaysia were formed during multiple stages of continental rifting in response to Palaeo-Pacific slab rollback pulses rather than by Tethyan evolutionary processes.

Supplementary material: Data for the Middle Jurassic–Early Cretaceous granitoids of East Malaya are available at

Thematic collection: This article is part of the Mesozoic and Cenozoic tectonics, landscape and climate change collection available at:

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