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

doi:10.1016/j.gr.2009.05.011

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 Publications › Journal Article (refereed) › peer-review

225 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 language	English
Pages (from-to)	145-152
Number of pages	8
Journal	Gondwana Research
Volume	17
Issue number	1
Early online date	2 Jun 2009
DOIs	https://doi.org/10.1016/j.gr.2009.05.011
Publication status	Published - Jan 2010
Externally published	Yes

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.

Funding

This research was jointly supported by research grants from the National Basic Research Program of China (973 Program) 2007CB411308, NSFC Projects 40721063, 40421303, 40772130, Hong Kong RGC (HKU 7043079), HKU CRCG and the CAS/SAFEA International Partnership Program for Creative Research Teams.

Keywords

Cu-Au mineralization
Dike
Junggar
Ridge subduction
Sanukitoid

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

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.",

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author = "Jiyuan YIN and Chao YUAN and Min SUN and Xiaoping LONG and Guochun ZHAO and WONG, {Kenny Powan} and Hongyan GENG and Keda CAI",

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.",

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AU - YIN, Jiyuan

AU - YUAN, Chao

AU - SUN, Min

AU - LONG, Xiaoping

AU - ZHAO, Guochun

AU - WONG, Kenny Powan

AU - GENG, Hongyan

AU - CAI, Keda

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PY - 2010/1

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AB - 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.

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

Abstract

Bibliographical note

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Keywords

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