naa a22 4500 510757006 CHVBK 20180411083126.0 cr unu---uuuuu 180411e20130801xx s 000 0 eng 10.1007/s12594-013-0130-7 doi (NATIONALLICENCE)springer-10.1007/s12594-013-0130-7 Petrological and geochemical study of serpentinised peridotites from the southern part of Manipur Ophiolitic Complex, Northeast India [Elektronische Daten] [N. Ibotombi Singh, L. Debala Devi, Th. Yaiphalembi Chanu] The southern Manipur Ophiolitic Complex in the Indo-Myanmar Orogenic Belt, Northeast India comprises a set of serpentinised peridotites, pelagic sediments, podiform chromitites with minor mafic and felsic intrusives. Peridotites in the study area suffered various degrees of serpentinisation and also have been highly deformed and metamorphosed. Striations and slickenside surfaces are common features seen in these rocks indicating the effect of faulting or shearing due to tectonic movement. On the basis of mineralogy and modal composition these peridotites have been identified as serpentinised harzburgite, lherzolite, serpentinite with minor wehrlite. The serpentine minerals are mainly lizardite and chrysotile with sub-ordinate antigorite, whereas, pyroxenes are enstatite and diopside. The primary composition of Cr-spinels in these serpentinised peridotites are characterized by low SiO2 (<0.11 wt.%), Fe2O3 (0.02 to 2.32 wt.%), TiO2 (<0.15 wt.%), Cr# (0.13 to 0.23) and high Al# (0.74 to 0.86), Mg# (0.68 to 0.73). Olivine is relatively uniform in composition, ranges from Fo89.64 to Fo90.1. The mineralogical compositions and primary Cr-spinel chemistry of these peridotites are similar to Abyssal peridotites that formed in a mid-ocean ridge setting after low degree of partial melting. Thus, it supports that the mantle peridotites of the Manipur Ophiolitic Complex initially formed in a spreading regime. Geological Society of India, 2013 Peridotites nationallicence XRD nationallicence Mineral chemistry nationallicence Manipur Ophiolitic Complex nationallicence Indo-Myanmar orogenic belt nationallicence Ibotombi Singh N. Departments of Geology, D.M. College of Science, 795138, Imphal, Manipur, India aut Debala Devi L. Departments of Geology, D.M. College of Science, 795138, Imphal, Manipur, India aut Yaiphalembi Chanu Th Departments of Geology, D.M. College of Science, 795138, Imphal, Manipur, India aut Journal of the Geological Society of India Springer India 82/2(2013-08-01), 121-132 0016-7622 82:2<121 2013 82 12594 https://doi.org/10.1007/s12594-013-0130-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12594-013-0130-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ibotombi Singh N. Departments of Geology, D.M. College of Science, 795138, Imphal, Manipur, India aut NATIONALLICENCE 700 1- Debala Devi L. Departments of Geology, D.M. College of Science, 795138, Imphal, Manipur, India aut NATIONALLICENCE 700 1- Yaiphalembi Chanu Th Departments of Geology, D.M. College of Science, 795138, Imphal, Manipur, India aut NATIONALLICENCE 773 0- Journal of the Geological Society of India Springer India 82/2(2013-08-01), 121-132 0016-7622 82:2<121 2013 82 12594 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer