Abstract
The occurrence of high-pressure and ultrahigh-pressure eclogites in the northern border of Qaidam basin in central China indicates the existence of a 350 km orogenic belt. These eclogites provide constraints for reconstructing the tectonic evolution history in this region. In this study, we analyzed nine eclogites sampled from the Xitieshan area, for their major and trace element abundances as well as 143Nd/144Nd isotopic ratios to investigate the factors controlling geochemical compositions of these eclogites and to infer the tectonic evolution in this region.
Highlights
The occurrence of high-pressure and ultrahigh-pressure eclogites in the northern border of Qaidam basin in central China indicates the existence of a 350 km orogenic belt
Group 1 samples occur only at the western portion of the studied orogenic belt. They have low LREE/HREE ratios resembling that of N-MORB
Group 2 samples have LREE/HREE higher than group 1 samples, and can be further divided into two subgroups characterized by the absence
Summary
The occurrence of high-pressure and ultrahigh-pressure eclogites in the northern border of Qaidam basin in central China indicates the existence of a 350 km orogenic belt. Proceedings of the Second Russia–China International Meeting on the Central Asian Orogenic Belt (September 6–12, 2017, Irkutsk, Russia) Geochemical characteristics of eclogites from northern Qaidam basin, Central China. These eclogites provide constraints for reconstructing the tectonic evolution history in this region.
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