西藏努日晚白垩世埃达克岩:洋脊俯冲的产物

代作文; 李光明; 丁俊; 黄勇; 曹华文

doi:10.3799/dqkx.2018.230

Volume 43 Issue 8

Aug. 2018

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Article Navigation > Earth Science > 2018 > 43(8): 2727-2741

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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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

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.ε_Hf(t) values of zircons range from -0.3 to +15.2 (mainly between +10.0 and +15.2), with t_DM2 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.
- Tibet,
- southern Gangdese,
- Nuri,
- Late Cretaceous,
- adakite,
- ridge subduction,
- geochemistry,
- geochronology

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Late Cretaceous Adakite in Nuri Area, Tibet: Products of Ridge Subduction

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