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- Publisher
- Wiley
- Copyright
- © 2012 Geological Society of China
- ISSN
- 1000-9515
- eISSN
- 1755-6724
- DOI
- 10.1111/j.1755-6724.2012.00713.x
- Publisher site
- See Article on Publisher Site
Abstract
Abstract: In the Beishan rift in the eastern Tianshan orogen, Xinjiang Province, a N‐S‐trending dyke swarm is present in the Pobei area. The swarm cuts through the 270–290 Ma mafic‐ultramafic intrusions associated with Ni‐Cu sulphide mineralization. These mafic‐ultramafic intrusions are typically found along E‐W major faults in the Tianshan orogenic belts. We report SHRIMP U‐Pb dating of zircons from a dyke of alkaline composition, which yielded a mean age of 252±9 Ma. Alkaline dykes of the same age are found in the Altay region of Siberia. This age is younger than the 270–290 Ma intraplate magmatic events that produced the mafic‐ultramafic intrusions in the region, but in general agreement with the 250–260 Ma Permian plume event that gave rise to the Siberian traps and the Emeishan flood basalts in SW China. We suggest that there is a link between the Emeishan event and the dyke swarm in the Beishan rift and that the intraplate magmatism at 270–290 Ma reflects an early stage of mantle plume activity. The N‐S trending dyke swarm in the Beishan rift may represent a later stage in the evolution of mantle plume activity in the NW and SW of China. We also speculate that in Beishan rift and possibly elsewhere in the Tianshan region, the dykes fed basaltic volcanism, whose products have since been eroded due to the strong uplift of the Tianshan orogen as a result of the India‐Eurasia collision in the Cenozoic.
Journal
Acta Geologica Sinica (English Edition) – Wiley
Published: Aug 1, 2012