对“龙游石榴石角闪岩是退变榴辉岩吗?”质疑的回复

Reply to “Is the garnet amphibolite in the Longyou a retrograde eclogite?”

《科学通报》2015年第13期发表了我们对浙江龙游地区石榴石角闪岩的研究成果(陈相艳等,2015).文章发表后,引起了南京大学于津海和舒良树两位老师的质疑,其认为石榴子石周围不存在典型的"白眼圈",也不存在典型的后成合晶结构,同时华南加里东期的构造环境也不会形成榴辉岩,即于津海和舒良树两位老师认为龙游石榴石角闪岩不是榴辉岩退变的产物.对此,我们结合详细的野外观察、显微镜下岩相学和矿物化学分析,认为该石榴石角闪岩是榴辉岩退变的产物,可以作为华夏加里东碰撞造山的证据.

Our paper titled ＂Retrograde garnet amphibolite from eclogite of the Zhejiang Longyou area： New evidence of the Caledonian orogenic event in the Cathaysia block＂ was recently published in Chinese Science Bulletin（Chen et al., 2015）. A comment by Prof. Yu Jinhai and Prof. Shu Liangshu from Nanjing University argued against our conclusions. They suggested that there were no typical coronas of plagioclase＋quartz around garnet porphyroblast and omphacite pseudomorph, as indicated by clinopyroxene＋plagioclase symplectites（actually intergrowths）. Moreover, they argued that the early paleozoic tectonic system, i.e., the intraplate orogeny model, was inconsistent with eclogite-facies metamorphism. In this reply, we once again presented our detailed field investigation, petrographic observations and mineral compositions studies. We carefully and seriously replied their questions one by one. We emphasized that the Longyou garnet amphibolite was a retrograde eclogite, which is genetically related to the Caledonian collisional orogenic event between the South China Block and an unknown block in the process of their assemblage to eastern Gondwana.