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Volume 19 Issue 1
Feb.  2008
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Zircon LA-ICP MS U-Pb Dating of the Longkang Andesitic Ignimbrites from Jiuzhaigou: Evidence of the Mianlue Suture Westward Extension

  • Received Date: 2018-07-15
  • Genesisofmetasedimentary-volcanicsoutcropedinKangxian-Pipasi-Nanping(康县-琵琶寺-南坪)tectoniczoneiscloselyrelatedwithtectonicevolutionoftheMianlue(勉略)Ocean.InthewestendofKangxian-Pipasi-Nanpingtectoniczone,therearehundredmetersofandesiticignimbritesandtuffites.ZirconU-Pbdatingonthesevolcanicshasgreatsignificancetothetectonicimplicationofthevolcanicrocks.Zirconsfromanignimbritesample(JZG-L)havebeencollectedfromYazhagou(牙扎沟)intheeastendoftheTazang-Longkang(塔藏-隆康)SectionforLA-ICPMSU-Pbdating.ThezirconsfromLongkangandesiticignimbritesaremagmaticgenesiswithoscillatoryzoningandhighU((35–750)ppm),Th((311–717)ppm)contentswithhighTh/U(0.44–1.30)ratios.Themeasured206Pb/238Uratiosareingoodanalyticalprecision,yieldingaweightedmeanageof(246±3)Ma(MSWD=2.6,n=12,2σ).Somedetritalzirconshavealsobeenobserved,theyhavemaximalconcordiaageof(2481±33)Ma,whichindicatestheexistenceofPrecambrianmaterialintheJiuzhaigou(九寨沟)area.Combinedwithregionalgeologyandthevolcanicrocksinthestudiedarea,the(246±3)MazirconU-PbagesuggestsaLatePermianorogenicvolcanismandprovidesimportantgeochronologyevidencefortheMianluesuturewestwardextension.
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通讯作者: 陈斌, bchen63@163.com
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Zircon LA-ICP MS U-Pb Dating of the Longkang Andesitic Ignimbrites from Jiuzhaigou: Evidence of the Mianlue Suture Westward Extension

  • 1. State Key Laboratory of Continental Dynamics, Dep

Abstract: Genesisofmetasedimentary-volcanicsoutcropedinKangxian-Pipasi-Nanping(康县-琵琶寺-南坪)tectoniczoneiscloselyrelatedwithtectonicevolutionoftheMianlue(勉略)Ocean.InthewestendofKangxian-Pipasi-Nanpingtectoniczone,therearehundredmetersofandesiticignimbritesandtuffites.ZirconU-Pbdatingonthesevolcanicshasgreatsignificancetothetectonicimplicationofthevolcanicrocks.Zirconsfromanignimbritesample(JZG-L)havebeencollectedfromYazhagou(牙扎沟)intheeastendoftheTazang-Longkang(塔藏-隆康)SectionforLA-ICPMSU-Pbdating.ThezirconsfromLongkangandesiticignimbritesaremagmaticgenesiswithoscillatoryzoningandhighU((35–750)ppm),Th((311–717)ppm)contentswithhighTh/U(0.44–1.30)ratios.Themeasured206Pb/238Uratiosareingoodanalyticalprecision,yieldingaweightedmeanageof(246±3)Ma(MSWD=2.6,n=12,2σ).Somedetritalzirconshavealsobeenobserved,theyhavemaximalconcordiaageof(2481±33)Ma,whichindicatestheexistenceofPrecambrianmaterialintheJiuzhaigou(九寨沟)area.Combinedwithregionalgeologyandthevolcanicrocksinthestudiedarea,the(246±3)MazirconU-PbagesuggestsaLatePermianorogenicvolcanismandprovidesimportantgeochronologyevidencefortheMianluesuturewestwardextension.

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