Supercooled melt inclusions in lower-crustal granulites as a consequence of rapid exhumation by channel flow

Yoshikuni Hiroi, Ayahiko Yanagi, Mutsumi Kato, Tomoyuki Kobayashi, Bernard Prame, Tomokazu Hokada, Madhusoodhan Satish-Kumar, Masahiro Ishikawa, Tatsuro Adachi, Yasuhito Osanai, Yoichi Motoyoshi, Kazuyuki Shiraishi

研究成果: ジャーナルへの寄稿記事

12 引用 (Scopus)

抄録

Here we report on the unexpected occurrence of felsic (granitic) inclusions with quench textures such as spherulite and dendrite (hereafter referred to as "felsite inclusions"), similar to some volcanic rocks, within garnet in presumably "slowly cooled" lower-crustal granulites of various geologic ages ranging from Early Proterozoic to Middle Paleozoic and wide global distribution (the Limpopo Belt, the Grenville Province, the Lützow-Holm Complex of East Antarctica, the Highland Complex of Sri Lanka, and the southern Bohemian Massif). The well-preserved textures of felsite inclusions are indicative of melts formed by anatexis during high-pressure and high-temperature metamorphism, crystallization under far-from-equilibrium conditions (at >. 50. °C undercooling) and subsequent rapid cooling. The occurrence of felsite inclusions in granulites in restricted tectonostratigraphic zones in Sri Lanka, among other examples, may be the first geologic evidence for fast exhumation of lower-crustal rocks to andalusite-stable upper-crustal conditions by channel flow in a continental collision orogen. We hypothesize that granulites ascend episodically along discrete high-strain zones and cool as fast as some felsic magmas. This conclusion sheds new light on the debate regarding the deep crustal processes and necessitates changes to fundamental beliefs about exhumation rates based on rates of plate convergence (1-10. cm/year).

元の言語英語
ページ(範囲)226-234
ページ数9
ジャーナルGondwana Research
25
発行部数1
DOI
出版物ステータス出版済み - 1 1 2014

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melt inclusion
channel flow
exhumation
texture
spherulite
plate convergence
andalusite
anatexis
continental collision
Proterozoic
garnet
volcanic rock
crystallization
metamorphism
Paleozoic
melt
cooling
rock
rate
distribution

All Science Journal Classification (ASJC) codes

  • Geology

これを引用

Hiroi, Y., Yanagi, A., Kato, M., Kobayashi, T., Prame, B., Hokada, T., ... Shiraishi, K. (2014). Supercooled melt inclusions in lower-crustal granulites as a consequence of rapid exhumation by channel flow. Gondwana Research, 25(1), 226-234. https://doi.org/10.1016/j.gr.2013.04.001

Supercooled melt inclusions in lower-crustal granulites as a consequence of rapid exhumation by channel flow. / Hiroi, Yoshikuni; Yanagi, Ayahiko; Kato, Mutsumi; Kobayashi, Tomoyuki; Prame, Bernard; Hokada, Tomokazu; Satish-Kumar, Madhusoodhan; Ishikawa, Masahiro; Adachi, Tatsuro; Osanai, Yasuhito; Motoyoshi, Yoichi; Shiraishi, Kazuyuki.

:: Gondwana Research, 巻 25, 番号 1, 01.01.2014, p. 226-234.

研究成果: ジャーナルへの寄稿記事

Hiroi, Y, Yanagi, A, Kato, M, Kobayashi, T, Prame, B, Hokada, T, Satish-Kumar, M, Ishikawa, M, Adachi, T, Osanai, Y, Motoyoshi, Y & Shiraishi, K 2014, 'Supercooled melt inclusions in lower-crustal granulites as a consequence of rapid exhumation by channel flow', Gondwana Research, 巻. 25, 番号 1, pp. 226-234. https://doi.org/10.1016/j.gr.2013.04.001
Hiroi, Yoshikuni ; Yanagi, Ayahiko ; Kato, Mutsumi ; Kobayashi, Tomoyuki ; Prame, Bernard ; Hokada, Tomokazu ; Satish-Kumar, Madhusoodhan ; Ishikawa, Masahiro ; Adachi, Tatsuro ; Osanai, Yasuhito ; Motoyoshi, Yoichi ; Shiraishi, Kazuyuki. / Supercooled melt inclusions in lower-crustal granulites as a consequence of rapid exhumation by channel flow. :: Gondwana Research. 2014 ; 巻 25, 番号 1. pp. 226-234.
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AU - Prame, Bernard

AU - Hokada, Tomokazu

AU - Satish-Kumar, Madhusoodhan

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AU - Adachi, Tatsuro

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AU - Motoyoshi, Yoichi

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