2012年
Geological map of the ultra-high pressure Brossasco-Isasca unit (Western Alps, Italy)
JOURNAL OF MAPS
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- 巻
- 8
- 号
- 4
- 開始ページ
- 465
- 終了ページ
- 472
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1080/17445647.2012.744367
- 出版者・発行元
- TAYLOR & FRANCIS LTD
In the southern Dora-Maira Massif, Western Alps, slivers of continental crust with similar lithologies, but recrystallized during the Alpine orogeny at different peak-P conditions, are exposed. They include the Brossasco-Isasca Unit (BIU) where coesite was first discovered in continental crust. A new 1:20,000-scale geologic map and related cross-sections of the whole BIU and adjoining units is presented, in which the most significant features useful to infer the pre-Alpine history and the Alpine tectonic and metamorphic evolution, are summarized. Thanks to detailed petrography and petrology, the geologic map shows the precise location of ultra-high pressure (UHP) minerals (such as coesite), and the locations of the most significant mineral assemblages (such as kyanite + jadeite). This innovative approach is used to distinguish the BIU from the adjacent units. Relict pre-Alpine structures (such as igneous intrusive contacts with basement xenoliths and metagranitoids) are summarized in a sketch illustrating the geologic setting of the UHP metamorphic unit as inferred before the Alpine orogeny.
- リンク情報
- ID情報
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- DOI : 10.1080/17445647.2012.744367
- ISSN : 1744-5647
- Web of Science ID : WOS:000313074200020