The Discovery and Tectonic Implication of Ultrahigh-Temperature Metamorphic Rocks in the Day Nui Con Voi, Northwestern Vietnam
详细信息
- 责任者：Wu Hujun (State Key Laboratory of Geological Processes and Mineral Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Liu Junlai
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(9)
- 关键词：超高压变质作用 ; ultrahigh pressure metamorphism ; 孔兹岩 ; khondalite ; 区域构造 ; regional tectonics ; 越南 ; Vietnam
- 页码：p.2809-2820
- 图表：6 illus., 1 table, 43 refs.
- 分类号：0802
- 出版序号：1682
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
There is a pile of rock blocks which contain corundum+spinel+garnet+fibrolite association in the form of lenticular enclaves in khondalite series along the Day Nui Con Voi, northwestern Vietnam. The mineral association is resulted from ultrahigh-temperature metamorphism. Meanwhile, the biotite-garnet thermometer and biotite-plagioclase-garnet-quartz association thermobarometer for the mineral associations during retrogressive metamorphism gave temperature and pressure ranges of 879~917 ℃ and 0.90~0.94 GPa, respectively. The metamorphic P-T path shows that there is an early coeval increase in temperature and pressure and a subsequent rapid increase in temperature before reaching the peak conditions.