31 resultados para Cochinchine (Vietnam)
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- KUPS-Datenbank - Universität zu Köln - Kölner UniversitätsPublikationsServer (2)
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- Chinese Academy of Sciences Institutional Repositories Grid Portal (31)
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- Gallica, Bibliotheque Numerique - Bibliothèque nationale de France (French National Library) (BnF), France (61)
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- Repositório Institucional UNESP - Universidade Estadual Paulista "Julio de Mesquita Filho" (11)
- Research Open Access Repository of the University of East London. (2)
- RUN (Repositório da Universidade Nova de Lisboa) - FCT (Faculdade de Cienecias e Technologia), Universidade Nova de Lisboa (UNL), Portugal (1)
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- Université de Montréal, Canada (14)
- University of Connecticut - USA (1)
- University of Michigan (45)
- University of Queensland eSpace - Australia (28)
- WestminsterResearch - UK (2)
Resumo:
The sedimentary-volcanic tuff (locally called "green-bean rock") formed during the early Middle Triassic volcanic event in Guizhou Province is characterized as being thin, stable, widespread, short in forming time and predominantly green in color. The green-bean rock is a perfect indicator for stratigraphic division. Its petrographic and geochemical features are unique, and it is composed mainly of glassy fragments and subordinately of crystal fragments and volcanic ash balls. Analysis of the major and trace elements and rare-earth elements ( REE), as well as the related diagrams, permits us to believe that the green-bean rock is acidic volcanic material of the calc-alkaline series formed in the Indosinian orogenic belt on the Sino-Vietnam border, which was atmospherically transported to the tectonically stable areas and then deposited as sedimentary-volcanic rocks there. According to the age of green-bean rock, it is deduced that the boundary age of the Middle-Lower Triassic overlain by the sedimentary-volcanic tuff is about 247 Ma.