Late Carboniferous high-Mg dioritic dikes in Western Junggar, NW China : Geochemical features, petrogenesis and tectonic implications

Jiyuan YIN, Chao YUAN*, Min SUN, Xiaoping LONG, Guochun ZHAO, Kenny Powan WONG, Hongyan GENG, Keda CAI

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)peer-review

220 Citations (Scopus)

Abstract

Late Paleozoic High-Mg dioritic dikes widely occur in western Junggar, NW China. Ar-Ar dating on rock chips of the dikes has yielded a plateau age of 321 ± 3 Ma, indicating an early Carboniferous age for the dikes. The dikes are enriched in SiO2 (52-57 wt.%), and characterized by high MgO (5.13-7.41 wt.%), Cr (134-204 ppm), Ni (59-141 ppm), Sr (468-724 ppm) and Ba (316-676 ppm) contents, with geochemical features analogous to those of sanukite of Setouchi volcanic belt, Japan. These dikes contain hornblende and biotite and generally have high Ba/La (27-124) and La/Nb (2.9-4.3) ratios and positive Eu anomalies, consistent with an origin from hydrous partial melting of a mantle source metasomatised by slab-derived component. The occurrence of sanukitic dikes, together with the coeval slab-related adakite in the area, implies that the western Junggar had been affected by hot, subduction-related regime, which gave rise to not only massive magmatism in the late Carboniferous, but also intensive Cu-Au mineralization in the area.

Original languageEnglish
Pages (from-to)145-152
Number of pages8
JournalGondwana Research
Volume17
Issue number1
Early online date2 Jun 2009
DOIs
Publication statusPublished - Jan 2010
Externally publishedYes

Bibliographical note

We thank Zhang Qi and Wang Qiang for their constructive suggestions. We are grateful to two anonymous reviewers whose critical reviews are very helpful in improving the manuscript.

Keywords

  • Cu-Au mineralization
  • Dike
  • Junggar
  • Ridge subduction
  • Sanukitoid

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