T. Hirajima et al., ECLOGITIZED METAGRANITOID FROM THE SU-LU ULTRA-HIGH PRESSURE (UHP) PROVINCE, EASTERN CHINA, Proceedings of the Japan Academy. Series B Physical and biological sciences, 69(10), 1993, pp. 249-254
Lenses of weakly deformed metagranitoid and coesite-bearing eclogite a
re both found within mylonitic orthogneiss of the Jiaodong Group in th
e Su-Lu ultra-high pressure (UHP) province, eastern China. In the meta
granitoid, omphacite overgrowing host clinopyroxene, and garnet corona
s developed along the grain boundaries between igneous plagioclase and
mafic phases suggest that the metagranitoid suffered an eclogite faci
es metamorphism. Quartz aggregates after igneous quartz in the metagra
nitoid show a distinctive polycrystalline, granoblastic texture. This
texture is similar to quartz aggregates of the Dora-Maira metagranite
which suffered coesite-eclogite facies metamorphism, but is dissimilar
to the Mount Mucrone metagranite which recrystallized under the less
extreme quartz eclogite facies. These features of the Su-Lu metagranit
oid suggest that the UHP metamorphism may have affected not only the e
clogite but also the surrounding metagranitoid.