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Paul, Madhuparna
- Mineralogy of the Manipur Ophiolite Belt, North East India:Implications for Mid-Oceanic Ridge and Supra-Subduction Zone Origin
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Authors
Thungyani N. Ovung
1,
Jyotisankar Ray
1,
Xueming Teng
2,
Biswajit Ghosh
1,
Madhuparna Paul
1,
Proloy Ganguly
1,
Saradee Sengupta
1,
Supriyo Das
1
Affiliations
1 Department of Geology, Calcutta University, 35 B.C. Road, Kolkata 700 019, IN
2 School of Earth Sciences and Resources, China University of Geosciences Beijing, 29 Xueyuan Road, Beijing 100083, CN
1 Department of Geology, Calcutta University, 35 B.C. Road, Kolkata 700 019, IN
2 School of Earth Sciences and Resources, China University of Geosciences Beijing, 29 Xueyuan Road, Beijing 100083, CN
Source
Current Science, Vol 112, No 10 (2017), Pagination: 2122-2129Abstract
Mineralogical studies on the mantle and crustal sections of the Manipur Ophiolite Belt (MOB) lead to important findings pertaining to its genesis and controlling tectonic milieu. The wide compositional gap in the Cr# and Mg# content of spinel in the mantle peridotites of MOB implies upper mantle melting in two different tectonic settings. The tectonic discrimination diagrams based on spinel chemistry indicate a midoceanic ridge (MOR) origin for the high-Al spinel peridotites and a supra-subduction zone origin for the high-Cr spinel peridotites. The pyroxenite mantle dyke, ultramafic cumulate and pillow-basalt record temperature in the range of 600-1030°C, 600-800°C and 700-1005°C respectively. Plotting of clinopyroxene composition of pillow-basalt in the TiO2-Na2O-SiO2/100 (wt%) tectonic discrimination diagram, implies a subduction-related origin of the basalts. Experimental studies on the serpentine stability indicate that it was dominantly affected by high temperature-low deformation setting.Keywords
Mineralogical Study, Ophiolite Belt, Pyroxenite Mantle Dyke, Pyroxene Thermometry.Full Text
References
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- Mineral Chemistry Perspective of Nain Ophiolite Mélange, Central Iran
Abstract Views :235 |
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Authors
Alireza Eslami
1,
Jyotisankar Ray
2,
Madhuparna Paul
2,
Sonia Sarkar
2,
Mousumi Banerjee
2,
Moussa Noghreyan
3,
Payel Dey
2
Affiliations
1 Department of Economic Geology, Tarbiat Modares University, Tehran 14115-175, IR
2 Department of Geology, University of Calcutta, Kolkata 700 019, IN
3 Department of Geology, University of Isfahan, Isfahan 81744, IR
1 Department of Economic Geology, Tarbiat Modares University, Tehran 14115-175, IR
2 Department of Geology, University of Calcutta, Kolkata 700 019, IN
3 Department of Geology, University of Isfahan, Isfahan 81744, IR
Source
Current Science, Vol 116, No 10 (2019), Pagination: 1742-1747Abstract
The present study documents detailed mineral chemi-stry perspective of Nain ophiolite mélange (NOM) of Central Iran with an aim of deciphering the mineral systematics and understanding geothermobarometric equilibration. The NOM covers ~600 km2 and is located at the northwest margin of Central Iranian Microcontinental block. NOM is represented by a sheared, tectonized and serpentinized peridotite in-truded by coarse-grained pegmatitic gabbroic dykes, layered gabbro, sheeted dolerite dykes (with typical rodingite alteration) and pillow basalts. Plagioclase in pillow basalt is albitic and indicates its spilitic affinity, while pyroxene is typically quad pyroxene (augite to diopside). Amphiboles belong to calcic group and range from actinolite to magnesio hornblende. Ilme-nite is the characteristic opaque phase. Clinopyroxene thermometry records a temperature span of 1100–1300C, while amphibole thermometry records 979–1145C. Two-feldspar thermometry also records a similar thermometric range. Amphibole barometry shows higher pressure of equilibration for mantle pegmatite in general and a very low equilibration pressure for sheeted dyke. Pyroxene compositions typically indicate a calc-alkaline basaltic (orogenic) parentage. NOM signifies lherzolite ophiolite type in a chromite-free environment and it is analogous to an idealized ophiolite succession, but has been emplaced in the form of discrete tectonic mélange.Keywords
Amphibole Barometry, Mineral Chemistry, Ophiolite Mélange, Orogenic Setting, Quad Pyroxene.Full Text
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