Micro-surgical Fib-tem Study of Diverse Liquidus Wadsleyite-ringwoodite Pairs Fractionally Crystallized from Olivine Melt Enclaves in Shock Melt Veins in L6 Chondrites
نویسندگان
چکیده
LIQUIDUS WADSLEYITE-RINGWOODITE PAIRS FRACTIONALLY CRYSTALLIZED FROM OLIVINE MELT ENCLAVES IN SHOCK MELT VEINS IN L6 CHONDRITES. A. El Goresy, M. Miyahara, E. Ohtani, T. Nagase, M. Nishijima, T. Ferroir and Ph. Gillet. Bayerisches Geoinstitut, Universität Bayreuth, 95447 Bayreuth, Germany, Email: [email protected], Graduate School of Science, Tohoku University, Sendai, 980-8758, Japan, ENSLyon, 69364 Lyon, France.
منابع مشابه
Evidence for fractional crystallization of wadsleyite and ringwoodite from olivine melts in chondrules entrained in shock-melt veins.
Peace River is one of the few shocked members of the L-chondrites clan that contains both high-pressure polymorphs of olivine, ringwoodite and wadsleyite, in diverse textures and settings in fragments entrained in shock-melt veins. Among these settings are complete olivine porphyritic chondrules. We encountered few squeezed and flattened olivine porphyritic chondrules entrained in shock-melt ve...
متن کاملTEM OBSERVATIONS OF AMORPHIZED SILICATE-PEROVSKITE, AKIMOTOITE AND Ca-RICH MAJORITE IN A SHOCK-INDUCED MELT VEIN IN THE TENHAM L6 CHONDRITE
Introduction: Tenham is a famous highly shocked L6 chondrite. Previous studies revealed a series of high-pressure minerals in the melt vein, including ringwoodite, majorite, wadsleyite, magnesiowüstite, akimotoite, silicate-perovskite, and hollanditestructured plagioclase [1-8]. These high-pressure minerals have been studied intensively in static highpressure experiments [9,10]. The presence of...
متن کاملDetailed Fib-tem Study of Ringwoodite Lamellae in Individual Olivine Grains in Shock-melt Veins of Yamato 791384 L6 Chondrite
LAMELLAE IN INDIVIDUAL OLIVINE GRAINS IN SHOCK-MELT VEINS OF YAMATO 791384 L6 CHONDRITE. M. Miyahara, E. Ohtani, M. Kimura, A. El Goresy, S. Ozawa and T. Nagase, Graduate School of Science, Tohoku University, Sendai, 980-8758, Japan, Faculty of Science, Ibaraki University, Mito, 310-8512, Japan, Bayerisches Geoinstitut, Universität Bayreuth, 95447 Bayreuth, Germany, The Tohoku University Museum...
متن کاملRingwoodite Lamellae in Olivine from the L6 S6 Chondrite Tenham: Constraints on the Transformation Mechanism
1. Introduction High-pressure minerals, produced by shock metamorphism, are common in and around melt veins in highly shocked chondrites [1-8]. These minerals either crystallized from silicate melt in the shock-vein or formed by solid-state transformed from host-rock fragments entrained in the melt or along shock-vein margins [3]. The study of these high pressure minerals can give us a better u...
متن کاملRingwoodite Microstructures in L-chondrites Rc106 and Acfer040: Implicatoins for Transformation Mechanisms
1. Introduction Ringwooodite, produced by shock metamorphism, is common in and adjacent to melt veins in highly shocked chondrites. Although ringwoodite can crystallize from the silicate melt in the shock-vein or pockets, most of the easily observed ringwoodite in shock veins is formed by the transformation of olivine in host-rock fragments entrained in the melt or olivine along shock-vein marg...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2009