Eclogites from the Northern Dabie Mountains, eastern China: Geochemical characteristics, Sr-Nd isotopic compositions and tectonic implications

The petrologic geochemical and Sr-Nd isotopic compositions of the eclogites from the mafic-ultramafic rock belt (MUMRB) in the Northern Dabie Mountain s indicate that: (1) the protoliths of most of eclogites are tholeiitic bas alt and a few may be gabbro, and most of them produced from the Yangtze sub ducted continental crust (lower crust and formed during the deep subduction ) and a part may be from paleo-oceanic relies between the Yangtze and North China continental plates; (2) their positive Nb anomalies and related trac e element characteristics show that they did not form in the island-are set ting; (3) the metamorphosed MUMRB with eclogite and meta-peridotite blocks along the southern part of the Mozitan-Xiaotian fault zone may represent th e suture zone produced during the collision between the Yangtze and North C hina continental prates, which included the Yangtze subducted continental c rust and paleo-oceanic relics.