RT Journal Article
T1 Petrogenesis of mafic–ultramafic cumulates in the Mayudia Ophiolite Complex, NE Himalaya: evidence of an island arc root in Eastern Neo-Tethys
A1 Sahoo, Sapneswar
A1 Majumdar, Alik S.
A1 Anand, Rajagopal
A1 Ray, Dwijesh
A1 Fuenlabrada Pérez, José Manuel
AB Amphibole-rich cumulates provide crucial information pertaining to the petrogenetic history of suprasubduction zone ophiolites and are, therefore, helpful in constraining the evolution and closure of the Neo-Tethys during the late Cretaceous to the early Tertiary period. Following this, the present contribution examines the meta-hornblendite and meta-hornblende-gabbro lithologies in the Mayudia ophiolite complex (MdOC), NE Himalaya, based on their field and petrographic relations, constituent mineral compositions, whole rock major and trace element chemistry and bulk strontium (Sr)—neodymium (Nd) isotope systematics. MdOC cumulates potentially represent the fossilized record of an island arc root, where amphibole + titanite + magnetite was fractionally crystallized from a super hydrous magma (10.56–13.61 wt.% melt water content) prior to plagioclase in a stable physico-chemical condition (T: 865–940 °C, P: 0.8–1.4 GPa, logfO2: −8.59–−11.19 unit) at lower crustal depths (30–38 km). Such extreme hydrous nature in the parental magma was generated by the flux melting of the sub-arc mantle wedge with aqueous inputs from the dehydrating slab. A super hydrous magmatic reservoir was, therefore, extant at sub-arc mantle depths in the eastern Neo-Tethys, which has likely modulated the composition of the oceanic crust during intraoceanic subduction.
PB MDPI
YR 2025
FD 2025-05-27
LK https://hdl.handle.net/20.500.14352/121783
UL https://hdl.handle.net/20.500.14352/121783
LA eng
NO Sahoo, S., Majumdar, A. S., Anand, R., Ray, D., & Fuenlabrada, J. M. (2025). Petrogenesis of mafic–ultramafic cumulates in the mayudia ophiolite complex, ne himalaya: Evidence of an island arc root in eastern neo-tethys. Minerals, 15(6), 572. https://doi.org/10.3390/min15060572
NO IIT (ISM)
DS Docta Complutense
RD 18 dic 2025