Volume 43 Issue 8
Aug.  2018
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Dai Zuowen, Li Guangming, Ding Jun, Huang Yong, Cao Huawen, 2018. Late Cretaceous Adakite in Nuri Area, Tibet: Products of Ridge Subduction. Earth Science, 43(8): 2727-2741. doi: 10.3799/dqkx.2018.230
Citation: Dai Zuowen, Li Guangming, Ding Jun, Huang Yong, Cao Huawen, 2018. Late Cretaceous Adakite in Nuri Area, Tibet: Products of Ridge Subduction. Earth Science, 43(8): 2727-2741. doi: 10.3799/dqkx.2018.230
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Late Cretaceous Adakite in Nuri Area, Tibet: Products of Ridge Subduction

doi: 10.3799/dqkx.2018.230
  • 1.

    College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China

  • 2.

    Chengdu Center of China Geological Survey, Chengdu 610081, China

  • Received Date: 2018-03-12
  • Publish Date: 2018-08-15
    Abstract
  • There are different understandings of the genesis and geodynamic mechanism for the Late Cretaceous adakite of the Gangdese belt.In this paper, we present zircon U-Pb data, geochemical and Hf isotopic data for the quartz diorite porphyry from Nuri area.The results show that the quartz diorite porphyry was emplaced at 96.5±1.3 Ma.These rocks are characterized by high SiO2(63.96%-65.75%), Al2O3(14.37%-15.99%), MgO (2.12%-2.39%), Sr (362×10-6-575×10-6, 467×10-6 on average), low Y (8.94×10-6-11.50×10-6), Yb (0.81×10-6-1.06×10-6) and high Sr/Y ratio (33.52-60.65), implying adakitic geochemical features.These rocks are low to medium-K, calc-alkaline and metalumious.They are enriched in LREE and depleted in HREE, together with enrichment in large-ion lithophile elements (LILE) and depletion in high field strength elements (HFSE), as well as small negative Eu anomalies.εHf(t) values of zircons range from -0.3 to +15.2 (mainly between +10.0 and +15.2), with tDM2 ranging from 187 Ma to 1 173 Ma (mainly from 187 Ma to 516 Ma), which indicates that the sources of these rocks were derived from subducted oceanic crust probably with a minor proportion of subducted sediments.High Mg# and compatible element Cr and Ni indicate that the melts have interacted with the mantle during ascent.By comparing with adakitic rocks from South Gangdese, we propose that high heat flow through a slab window induced partial melting of the oceanic crust at slab window edges to form the quartz diorite porphyry from Nuri, under the geodynamic setting of ridge subduction.

     

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