Geologic evolution of the Sør Rondane Mountains, East Antarctica: Collision tectonics proposed based on metamorphic processes and magnetic anomalies

Yasuhito Osanai, Yoshifumi Nogi, Sotaro Baba, Nobuhiko Nakano, Tatsuro Adachi, Tomokazu Hokada, Tsuyoshi Toyoshima, Masaaki Owada, Madhusoodhan Satish-Kumar, Atsushi Kamei, Ippei Kitano

研究成果: ジャーナルへの寄稿記事

38 引用 (Scopus)

抄録

The Sør Rondane Mountains of eastern Dronning Maud Land, East Antarctica can be subdivided into two different crustal terranes: the NE-terrane and the SW-terrane. The former is underlain by basement rocks of amphibolite-facies (unit A) and granulite-facies (unit B), and the latter by granulite-facies (unit C) to greenschist-facies (units D and D') rocks. The metamorphic evolution of the NE-terrane exhibits a clockwise pressure-temperature-time (. P-T-t) path and the SW-terrane exhibits a counter-clockwise P-T-t path, and detrital zircon U-Pb ages are also different between the two terranes. The differences in the metamorphic evolution processes and detrital zircon provenance in these two regions can be explained by the collision of the NE-terrane and the SW-terrane which is constrained to have occurred at 600-650. Ma. The collision is interpreted to reflect convergence between the East Maud-East African orogen terrane and the Maud-Nampula terrane of the Kalahari Craton, which are bounded by the Main Tectonic Boundary and passes through the Sør Rondane Mountains. The RTP magnetic anomalies suggest this suture is cut by the subsequent collision boundary between the Kalahari Craton and the Rayner Belt, which is exposed in the Lützow-Holm region. This collisional belt is considered to have formed at approximately 520-580. Ma.

元の言語英語
ページ(範囲)8-29
ページ数22
ジャーナルPrecambrian Research
234
DOI
出版物ステータス出版済み - 9 1 2013

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Tectonics
magnetic anomaly
terrane
collision
Rocks
tectonics
mountain
granulite facies
craton
zircon
Temperature
Antarctica
P-T-t path
greenschist facies
basement rock
amphibolite facies
provenance

All Science Journal Classification (ASJC) codes

  • Geology
  • Geochemistry and Petrology

これを引用

Geologic evolution of the Sør Rondane Mountains, East Antarctica : Collision tectonics proposed based on metamorphic processes and magnetic anomalies. / Osanai, Yasuhito; Nogi, Yoshifumi; Baba, Sotaro; Nakano, Nobuhiko; Adachi, Tatsuro; Hokada, Tomokazu; Toyoshima, Tsuyoshi; Owada, Masaaki; Satish-Kumar, Madhusoodhan; Kamei, Atsushi; Kitano, Ippei.

:: Precambrian Research, 巻 234, 01.09.2013, p. 8-29.

研究成果: ジャーナルへの寄稿記事

Osanai, Yasuhito ; Nogi, Yoshifumi ; Baba, Sotaro ; Nakano, Nobuhiko ; Adachi, Tatsuro ; Hokada, Tomokazu ; Toyoshima, Tsuyoshi ; Owada, Masaaki ; Satish-Kumar, Madhusoodhan ; Kamei, Atsushi ; Kitano, Ippei. / Geologic evolution of the Sør Rondane Mountains, East Antarctica : Collision tectonics proposed based on metamorphic processes and magnetic anomalies. :: Precambrian Research. 2013 ; 巻 234. pp. 8-29.
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title = "Geologic evolution of the S{\o}r Rondane Mountains, East Antarctica: Collision tectonics proposed based on metamorphic processes and magnetic anomalies",
abstract = "The S{\o}r Rondane Mountains of eastern Dronning Maud Land, East Antarctica can be subdivided into two different crustal terranes: the NE-terrane and the SW-terrane. The former is underlain by basement rocks of amphibolite-facies (unit A) and granulite-facies (unit B), and the latter by granulite-facies (unit C) to greenschist-facies (units D and D') rocks. The metamorphic evolution of the NE-terrane exhibits a clockwise pressure-temperature-time (. P-T-t) path and the SW-terrane exhibits a counter-clockwise P-T-t path, and detrital zircon U-Pb ages are also different between the two terranes. The differences in the metamorphic evolution processes and detrital zircon provenance in these two regions can be explained by the collision of the NE-terrane and the SW-terrane which is constrained to have occurred at 600-650. Ma. The collision is interpreted to reflect convergence between the East Maud-East African orogen terrane and the Maud-Nampula terrane of the Kalahari Craton, which are bounded by the Main Tectonic Boundary and passes through the S{\o}r Rondane Mountains. The RTP magnetic anomalies suggest this suture is cut by the subsequent collision boundary between the Kalahari Craton and the Rayner Belt, which is exposed in the L{\"u}tzow-Holm region. This collisional belt is considered to have formed at approximately 520-580. Ma.",
author = "Yasuhito Osanai and Yoshifumi Nogi and Sotaro Baba and Nobuhiko Nakano and Tatsuro Adachi and Tomokazu Hokada and Tsuyoshi Toyoshima and Masaaki Owada and Madhusoodhan Satish-Kumar and Atsushi Kamei and Ippei Kitano",
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T1 - Geologic evolution of the Sør Rondane Mountains, East Antarctica

T2 - Collision tectonics proposed based on metamorphic processes and magnetic anomalies

AU - Osanai, Yasuhito

AU - Nogi, Yoshifumi

AU - Baba, Sotaro

AU - Nakano, Nobuhiko

AU - Adachi, Tatsuro

AU - Hokada, Tomokazu

AU - Toyoshima, Tsuyoshi

AU - Owada, Masaaki

AU - Satish-Kumar, Madhusoodhan

AU - Kamei, Atsushi

AU - Kitano, Ippei

PY - 2013/9/1

Y1 - 2013/9/1

N2 - The Sør Rondane Mountains of eastern Dronning Maud Land, East Antarctica can be subdivided into two different crustal terranes: the NE-terrane and the SW-terrane. The former is underlain by basement rocks of amphibolite-facies (unit A) and granulite-facies (unit B), and the latter by granulite-facies (unit C) to greenschist-facies (units D and D') rocks. The metamorphic evolution of the NE-terrane exhibits a clockwise pressure-temperature-time (. P-T-t) path and the SW-terrane exhibits a counter-clockwise P-T-t path, and detrital zircon U-Pb ages are also different between the two terranes. The differences in the metamorphic evolution processes and detrital zircon provenance in these two regions can be explained by the collision of the NE-terrane and the SW-terrane which is constrained to have occurred at 600-650. Ma. The collision is interpreted to reflect convergence between the East Maud-East African orogen terrane and the Maud-Nampula terrane of the Kalahari Craton, which are bounded by the Main Tectonic Boundary and passes through the Sør Rondane Mountains. The RTP magnetic anomalies suggest this suture is cut by the subsequent collision boundary between the Kalahari Craton and the Rayner Belt, which is exposed in the Lützow-Holm region. This collisional belt is considered to have formed at approximately 520-580. Ma.

AB - The Sør Rondane Mountains of eastern Dronning Maud Land, East Antarctica can be subdivided into two different crustal terranes: the NE-terrane and the SW-terrane. The former is underlain by basement rocks of amphibolite-facies (unit A) and granulite-facies (unit B), and the latter by granulite-facies (unit C) to greenschist-facies (units D and D') rocks. The metamorphic evolution of the NE-terrane exhibits a clockwise pressure-temperature-time (. P-T-t) path and the SW-terrane exhibits a counter-clockwise P-T-t path, and detrital zircon U-Pb ages are also different between the two terranes. The differences in the metamorphic evolution processes and detrital zircon provenance in these two regions can be explained by the collision of the NE-terrane and the SW-terrane which is constrained to have occurred at 600-650. Ma. The collision is interpreted to reflect convergence between the East Maud-East African orogen terrane and the Maud-Nampula terrane of the Kalahari Craton, which are bounded by the Main Tectonic Boundary and passes through the Sør Rondane Mountains. The RTP magnetic anomalies suggest this suture is cut by the subsequent collision boundary between the Kalahari Craton and the Rayner Belt, which is exposed in the Lützow-Holm region. This collisional belt is considered to have formed at approximately 520-580. Ma.

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