“Spherulite-like” jadeite growth in shock-melt veins of the Novosibirsk H5/6 chondrite

I. S. Bazhan, Shin Ozawa, M. Miyahara, Eiji Otani, K. D. Litasov

研究成果: Article査読

8 被引用数 (Scopus)

抄録

The Novosibirsk H5/6 ordinary chondrite has signs of shock metamorphism, such as dark shock-melt veins (SMVs) crossing the chondrite host rock. The plagioclase composition grains (Ab78An14Or7) with jadeite were found in the host-rock fragments inside the SMVs. Jadeite has an unusual radial-concentric spherulite-like microtexture. The spherulite-like jadeite formed from the molten plagioclase grain under high-pressure and high-temperature conditions during an impact event. The crystallization was accompanied by sodium-potassium differentiation between coexisting jadeite and residual melt. The PT-conditions of jadeite formation were estimated to be 3-14 GPa and 1400-2150 °C. Jadeite crystallization, Na-K differentiation, and the pressure-temperature estimates of jadeite formation in the Novosibirsk chondrite are very close to those in the Chelyabinsk LL5 chondrite. The spherulite-like microtexture and jadeite-glass coexistence, most likely, point to a high cooling rate of the SMVs at the pressure release stage of the metamorphic process.

本文言語English
ページ(範囲)12-19
ページ数8
ジャーナルRussian Geology and Geophysics
58
1
DOI
出版ステータスPublished - 2017 1 1

ASJC Scopus subject areas

  • 地球物理学
  • 地質学

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