2021 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)
Sep 15 - Sep 19, 2021Online
2021 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)
Sep 15 - Sep 19, 2021Online
[R6-09]Petrological and geochemical studies of igneous rocks in the Nidar ophiolite complex, northwest India[Presentation award entry]
*Akinori Sato1, Takeshi Imayama1, Dutta Dripta2, Yasuaki Kaneda3, Shota Watanabe3, Takeshi Hasegawa3, Masayo Minami4, Yuki Wakasugi4, Shigeyuki Wakaki5(1. Okayama Univ Sci., 2. IIT Bombay., 3. Ibaraki univ., 4. Nagoya univ., 5. Kochi JAMSTEC)
Keywords:
Nidar ophiolite,subduction initiation,petrology,geochemistry
The early Cretaceous Nidar Ophiolite complex is exposed in Ladakh, NW India. Arc-type dolerite and basalt yield flat REE patterns, whereas MORB-type gabbro has low REE concentrations and depleted LREE content. These igneous rocks have depleted Nd isotopic ratio. Combined with previous studies, the ophiolite in Ladakh formed by magmatism during seafloor spreading at the subduction initiation, followed by island arc tholeiitic to island arc calc-alkaline magmatism as the subduction zone developed.