Rutile U-Pb age for the ultrahigh pressure eclogite from the Dabie Mountains, central China: Evidence for rapid cooling
作者： Qiuli Li , Shuguang Li , Hongying Zhou , Huimin Li , Ji’an Hong
DOI: 10.1360/02TB9012
关键词: Rutile 、 Central china 、 Metamorphic zone 、 Omphacite 、 Closure temperature 、 Geology 、 Mineralogy 、 Metamorphic rock 、 Geochemistry 、 Eclogite 、 Isochron
摘要: The U-Pb isotope compositions of rutile, omphacite and garnet in the eclogite from Jinheqiao area Southern Dabie ultrahigh-pressure metamorphic zone were analyzed. consistent high precision age (218 ±1.2) Ma rutile Mountains was obtained by two ways isochron common Pb correction based on composition omphacite. This proves that has a U/Pb ratio (μ = 2.8) low enough to be used for analyses rutile. Under rapid cooling condition (40 °C/Ma) closure temperature diffusion is about 470 °C. Thus, this 218 should at °C instead peak age.
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