Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6440840 | Lithos | 2013 | 11 Pages |
Abstract
This paper presents petrography, zircon U-Pb ages and Hf isotopic data as well as whole-rock Sm-Nd isotopic data for mafic granulites, metapelitic rocks and high-grade marble from the Kongling Complex in the Yangtze Block, South China. Petrographic observations indicate that these three types of rocks experienced high-pressure metamorphism. Their mineral assemblages and P-T conditions define a clockwise P-T path involving isothermal decompression following the peak high-pressure metamorphism, which is considered to record a continent-continent collisional event. This is systematic documentation of the tectonic evolution of the Kongling Complex from 2.1-2.0Â Ga deposition (constrained by youngest detrital zircon and metamorphic zircon) through ~Â 2.0Â Ga collision (high-pressure metamorphism) and syn-collisional partial melting (S-type granite and migmatization of TTG gneiss) to ~Â 1.85Â Ga post-collisional extension (A-type high-K granite and mafic dyke). These ages are broadly coincident with global collisional events (2.1-1.8Â Ga) that led to the assembly of the Palaeo-Mesoproterozoic Columbia (or Nuna) supercontinent. Therefore, this study provides strong evidence that the Yangtze Block in South China was a component of the Columbia supercontinent.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geochemistry and Petrology
Authors
Changqing Yin, Shoufa Lin, Donald W. Davis, Guochun Zhao, Wenjiao Xiao, Longming Li, Yanhong He,