Journal of the Geological Society of India

, Volume 86, Issue 2, pp 223–232 | Cite as

Zircon U-Pb age and geochemical characteristics of ore-bearing granodiorite porphyry in the Duobuza porphyry copper deposit, Tibet

  • Guangchun Fei
  • Xiong Zhou
  • Ji Duo
  • Yu Zhou
  • Chun-Qi Wen
  • Quan Wen
  • Yangyang He
  • Yan Huo
  • Zhengxi Yang
  • Jinshu Zhang
  • Hongfei Liu
Research Articles
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Accepted:

Abstract

The Duobuza deposit is the first porphyry-type copper deposit discovered with giant prospect in the Bangongco metallogenic belt. Geochemical data indicates that the ore-bearing Duobuza granodiorite porphyry is high-K calc-alkaline to shoshonitic and peraluminous composition. The ore-bearing granodiorite porphyry is enriched in large-ion lithophile elements(LILE) such as Rb, K, Th, La, Ce and Sr, and depleted in high-field-strength elements(HFSE) such as Nb, Ta, P, and Ti. The rare-earth element (REE) patterns show enrichment in light REEs relative to heavy REEs. The major, rareearth, and trace elements of the ore-bearing granodiorite porphyry show characteristics of adakites, formed in an island arc setting. The laser ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS) zircon U–Pb age of the orebearing granodiorite porphyry is 123.4±1.2 Ma (MSWD = 1.7), which also represents the age of the copper-mineralization. Together with the age data of the early Cretaceous magmatic rocks in the Bangongco–Nujiang suture zone and the middle-northern Gangdese, it indicates that there was bidirectional (northward and southward) subduction of the Bangongco–Nujiang ocean during 120 Ma, and the Duobuza deposit was related to this event.

Keywords

Granodiorite Porphyry zircon LA-ICP-MS U-Pb age Duobuza tectonic setting Tibet 
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Copyright information

© Geological Society of India 2015

Authors and Affiliations

  • Guangchun Fei
    • 1
    • 2
  • Xiong Zhou
    • 3
  • Ji Duo
    • 4
  • Yu Zhou
    • 2
    • 3
  • Chun-Qi Wen
    • 2
  • Quan Wen
    • 2
  • Yangyang He
    • 2
  • Yan Huo
    • 2
  • Zhengxi Yang
    • 2
  • Jinshu Zhang
    • 4
  • Hongfei Liu
    • 4
  1. 1.Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation, Ministry of Land and ResourcesChengdu University of TechnologyChengduChina
  2. 2.College of Earth SciencesChengdu University of TechnologyChengduSichuanChina
  3. 3.Institute of Multipurpose Utilization of Mineral ResourcesChinese Academy of Geological SciencesChengduChina
  4. 4.Geological and Mineral Resources Exploration Bureau of TibetLasa, TibetChina

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