caa a22 4500 467889961 CHVBK 20180406152746.0 cr unu---uuuuu 170328e20060901xx s 000 0 eng 10.1007/s00710-006-0150-8 doi (NATIONALLICENCE)springer-10.1007/s00710-006-0150-8 Eclogite xenoliths from Wajrakarur kimberlites, southern India [Elektronische Daten] [S. C. Patel, S. Ravi, S. S. Thakur, T. K. Rao, K. V. Subbarao] Summary: Mineralogical characteristics of eclogite xenoliths from three kimberlite pipes (KL2, P2 and P10) of the Proterozoic Wajrakarur kimberlite field of southern India have been studied. In a rare sample of enstatite eclogite from the KL2 pipe garnet contains microscopic triangular arrays of needles or blebs of omphacite, enstatite and rutile consistent with an origin by exsolution parallel to the isometric form {111}. Discrete omphacite grains in the sample contain exsolved needles or blebs of enstatite and garnet. Kyanite eclogites are abundant in the KL2 pipe which occasionally show a secondary ring of pure celsian around kyanite grains. Omphacite Na2O contents in the eclogites of the KL2 and P2 pipes are typically between 3 and 6 wt%, and garnet has widely variable composition with end member ranges of Prp22-81Grs0-47Alm10-30Sps0-1Adr0-5Uv0-3. Eclogites of the P10 pipe comprise chromian omphacite and garnet. Phase relations in the ACF projection exhibit systematic increase of the Ca-Tschermak's component in omphacite from enstatite eclogite through biminerallic eclogite to kyanite eclogite. Garnet-clinopyroxene Fe-Mg geothermometry yields temperatures mostly in the range of 900-1100 °C. A formerly supersilicic nature of garnet in enstatite eclogite as inferred from exsolution mineralogy indicates minimum peak pressure of 5 GPa. Springer-Verlag, 2006 Patel S. C. Department of Earth Sciences, Indian Institute of Technology, Mumbai, India aut Ravi S. Geological Survey of India, Southern Region, Hyderabad, India aut Thakur S. S. Department of Earth Sciences, Indian Institute of Technology, Mumbai, India aut Rao T. K. Geological Survey of India, Southern Region, Hyderabad, India aut Subbarao K. V. Department of Earth Sciences, Indian Institute of Technology, Mumbai, India aut Mineralogy and Petrology Springer-Verlag 88/1-2(2006-09-01), 363-380 0930-0708 88:1-2<363 2006 88 710 https://doi.org/10.1007/s00710-006-0150-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00710-006-0150-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Patel S. C. Department of Earth Sciences, Indian Institute of Technology, Mumbai, India aut NATIONALLICENCE 700 1- Ravi S. Geological Survey of India, Southern Region, Hyderabad, India aut NATIONALLICENCE 700 1- Thakur S. S. Department of Earth Sciences, Indian Institute of Technology, Mumbai, India aut NATIONALLICENCE 700 1- Rao T. K. Geological Survey of India, Southern Region, Hyderabad, India aut NATIONALLICENCE 700 1- Subbarao K. V. Department of Earth Sciences, Indian Institute of Technology, Mumbai, India aut NATIONALLICENCE 773 0- Mineralogy and Petrology Springer-Verlag 88/1-2(2006-09-01), 363-380 0930-0708 88:1-2<363 2006 88 710 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer