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2015 Vol. 48, No. 4
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LIN Xinwang, WANG Xing, ZHANG Yafeng, GUO Qiming, ZHAO Duanchang, LV Junli. Zircon U-Pb Dating of Volcanic Rocks from Aershate Area in Eastern Altay and Its Geological Implications[J]. Northwestern Geology, 2015, 48(4): 61-69.
Citation: LIN Xinwang, WANG Xing, ZHANG Yafeng, GUO Qiming, ZHAO Duanchang, LV Junli. Zircon U-Pb Dating of Volcanic Rocks from Aershate Area in Eastern Altay and Its Geological Implications[J]. Northwestern Geology, 2015, 48(4): 61-69.
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Zircon U-Pb Dating of Volcanic Rocks from Aershate Area in Eastern Altay and Its Geological Implications

  • Shaanxi Center of Geological Survey, Xi'an 710068, Shaanxi, China

Received Date:  26 June 2015
Revised Date:  02 July 2015
Publish Date:  15 December 2015
    Abstract
  • The Nurt-Aershate area is located in the eastern part of Altay, where Late Paleozoic volcanic rocks are well developed. There exists a set of rock assemblages of altered rhyolite and tuff dacite rhyolite in Aershate area, which isextensively and stably distributed distribution from northwest to southeast with a zoned shape. This set of rock assemblages was originally assigned to the Member a of Hongshanzui Formation, but itslithologic characteristics is obviously different from Member b and c of Hongshanzui Formation. The altered rhyolitesare selected to determine for LA-ICP-MS zircon U-Pb ages. The result shows that the 206Pb/238U and 207Pb/235U concordia age is(400.5±4.6)Ma, the 206Pb/238U weighted average age is(400.4±3.6)Ma, indicating the rock crystallization age were formed in the Early Devonian, not Carboniferous. Combined with the data of southern margin of Altay, the volcanic rocks were generated in a continental arc setting of active continental margin.
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