File:Jadeitite (jadeite jade) (Burma) 2 (24666650906).jpg
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[edit]DescriptionJadeitite (jadeite jade) (Burma) 2 (24666650906).jpg |
Jadeite jade with weathering rind from the Jurassic of Burma. (public display, Field Museum of Natural History, Chicago, Illinois, USA) “Jade” refers to more than one specific type of metamorphic rock. The four categories of “jade” are: 1) jadeitite (jadeite jade) 2) nephrite/nephritite (nephrite jade) 3) chromian jade (maw sit sit) 4) serpentine jade Jadeitite (= jadeite jade) is a rare metamorphic rock composed of jadeite pyroxene (Na(Al,Fe)(Si2O6)). Published research on Burmese jade generally indicates that the jadeitite rock masses formed by metasomatism of albitites (= plagioclase feldspar metamorphites) at the periphery of serpentinized mantle peridotite bodies. The mantle peridotite was part of a subducting slab of Mesozoic-aged oceanic lithosphere that was emplaced upward and against southeast Asian continental lithosphere by obduction. The rock shown above is a boulder of deep green jadeitite. The light brown portions of the rock are a weathering rind. The gash in the rock is a "window", carved to show the nature, color, and quality underneath the weathered surface. This variety is "Imperial Jade". Geologic unit: unrecorded/undisclosed (but probably derived from the Hpakan-Tawmaw Jade Tract, Hpakan Ultramafic Body, Naga-Adaman Ophiolite) Age: Syngenetic zircons indicate that Burmese jadeitite formed at 147 Ma (late Tithonian Stage, near-latest Jurassic. The serpentinite host rocks formed (metamorphic age) at 163 Ma (Middle Jurassic). Older literature interprets Burmese jadeitite as Tertiary in age, hosted by Late Creatceous to Eocene serpentinized peridotites. Locality: alluvial clast (placer jade) from unrecorded/undisclosed locality in Burma (possibly from the vicinity of Phakant, upper reaches of the Uyu River (Uru River), western Kachin State, Indo-Burma Range, northern Burma) References on Burmese jade: Bender, F. 1983. Geology of Burma. Berlin. Gebruder Borntraeger. 260 pp. Hughes, R.W., O. Galibert, G. Bosshart, F. Ward, Oo T., M. Smith, Sun Tay Thye & G.E. Harlow. 2000. Burmese jade: the inscrutable gem. Gems & Gemology 36(1): 2-26. Qiu Zhili, Wu Fuyuan, Yang Shufeng, Zhu Min, Sun Jinfeng & Yang Ping. 2008. Age and genesis of the Myanmar jadeite: constraints from U-Pb ages and Hf isotopes of zircon inclusions. Chinese Science Bulletin 54: 658-668. Rossman, G.R. 1974. Lavender jade, the optical spectrum of Fe3+ and Fe2+ --> Fe3+ intervalence charge transfer in jadeite from Burma. American Mineralogist 59: 868-870. Shi Guanghai, Cui Wenyuan, Cao Shumin, Jiang Neng, Jian Ping, Liu Dunyi, Miao Laicheng & Chu Bingbing. 2008. Ion microprobe zircon U-Pb age and geochemistry of the Myanmar jadeitite. Journal of the Geological Society of London 165: 221-234. Shi Guanghai, Cui Wenyuan, Wang Changqiu & Zhang Wenhuai. 2000. The fluid inclusions in jadeitite from Pharkant area, Myanmar. Chinese Science Bulletin 45: 1896-1901. Shi Guang-Hai, Jiang Neng, Liu Yan, Wang Xia, Zhang Zhi-Yu & Xu Yong-Jing. 2009. Zircon Hf isotope signature of the depleted mantle in the Myanmar jadeitite: implications for Mesozoic intra-oceanic subduction between the Eastern Indian Plate and the Burmese Platelet. Lithos 112: 342-350. Shi Guanghai, Jiang Neng, Wang Yuwang, Zhao Xin, Wang Xia, Li Guowu, E. Ng & Cui Wenyuan. 2010. Ba minerals in clinopyroxene rocks from the Myanmar jadeitite area: implications for Ba recycling in subduction zones. European Journal of Mineralogy 22: 199-214. Shi Guanghai, Wang Xia, Chu Bingbing & Cui Wenyuan. 2009. Jadeite jade from Myanmar: its texture and gemmological implications. The Journal of Gemmology 31: 185-195. |
Date | |
Source | Jadeitite (jadeite jade) (Burma) 2 |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/24666650906 (archive). It was reviewed on 30 November 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
30 November 2019
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File change date and time | 13:46, 29 January 2016 |
Y and C positioning | Co-sited |
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Date and time of digitizing | 11:58, 18 December 2011 |
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Date metadata was last modified | 08:46, 29 January 2016 |
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