Details

Autor(en) / Beteiligte

• Liu, Yi-Can
• Gu, Xiao-Feng
• Li, Shu-Guang
• Chen, Zhen-Yu

Titel

Allanite and fluor-apatite formed under ultrahigh-pressure conditions from the Luotian eclogites in the North Dabie complex zone

Ist Teil von

• Zhōngguó kēxué jìshù dàxué xuébào, 2007-08, Vol.37 (8), p.933-939

Erscheinungsjahr

2007

Link zum Volltext

Quelle

Elektronische Zeitschriftenbibliothek (Open access)

Beschreibungen/Notizen

• Metamorphic petrology of eclogites at Luotian from the southwestern part of the North Dabie complex zone, central China, was studied. It was found that except for usual eclogitic minerals such as garnet, omphacite and rutile, the eclogites contain allanite and fluor-apatite. Allanites are rich in rare earth elements (REE) and occur as inclusion in garnet, and some of them were partly retrogreted to epidote. Whereas fluor (F)-apatite occurs as inclusion in garnet or in matrix, the former is rich in F (-3 wt%) without any exsolutions and the latter is relatively poor in F (-1 wt%) associated with the oriented pyrrhotite exsolution. In view of occurrence and assemblage of the coexisting minerals with allanite and fluor-apatite in garnet, it is suggested that they formed at peak stage of ultrahigh-pressure (UHP) metamorphism. These results provide new evidence that UHP metamorphism occurred in the eclogites at the Luotian dome.