Geochronology investigation of the Bahlul Daghi volcanic dome, north of Tabriz, by application of 40Ar/39Ar dating on biotite

Document Type : Original Article

Author

Abstract

Tabriz Basin has had extensive Cenozoic and Quaternary volcanic activity and lies in NW Iran within the collision zone of the Arabian and Eurasian plates. Formations in the region consist of siliciclastic rocks of the Miocene age (Upper red formation), along with younger dacite volcanic rocks. The Bahlul Daghi volcanic dome in the south of Spiran is variable in terms of the composition between dacite to rhyolite. It usually contains porphyry texture with phenocrysts of quartz, plagioclase, sanidine, hornblende and biotite. Field observations clearly show that they penetrate into the sequence of the Upper Red Formation, so they are younger than these units. In order to determine the exact age of volcanic rocks, Ar-Ar age dating was performed on seven biotite crystals isolated from the dacite sample. This analysis yielded saddle-shaped age spectra with initially old apparent ages followed by decreasing to a well defined plateau age, from which a precise age for volcanic rocks can be determined. Our new 40Ar/39Ar isochron results date this volcanic rocks 2.05±0.15 Ma.

Keywords

References

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  • Receive Date: 23 April 2018
  • Revise Date: 29 August 2018
  • Accept Date: 29 September 2018

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