National Institute of Polar Research
Department of Earth Sciences, College of General Educations, Tohoku University
Department of Earth Sciences, College of General Educations, Tohoku University
抄録(英)
Two types of mafic dike rocks intruded the late Proterozoic metamorphic terrains of eastern Queen Maud Land : thermally metamorphosed rocks and unmetamorphosed rocks. The former is metamorphosed by ca. 500Ma granite intrusions, whereas the latter is Jurassic in age. The metadike rocks are continental tholeiites, although the geochemical character is variable from place to place. In particular, the rocks from the S∅r Rondane Mountains are transitional between quartz tholeiite and alkaline basalt. By analogy with other areas, the suggested tectonic environment for intrusion is an initial continental rift system. Unmetamorphosed dike rocks are similar in composition to Jurassic tholeiitic dike rocks from western Queen Maud Land. A Jurassic basalt-dolerite suite may widely occur under the continental ice of eastern Queen Maud Land.
雑誌書誌ID
AA1072335X
雑誌名
Proceedings of the NIPR Symposium on Antarctic Geosciences
GEOCHEMISTRY OF POST-OROGENIC MAFIC DIKE ROCKS FROM THE EASTERN QUEEN MAUD LAND, EAST ANTARCTICA
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KJ00002368157
(2.06MB)
概要
