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Late Cretaceous magmatism and porphyry Mo–Cu polymetallic mineralization in the Tongchanggou Intrusion, Geza Arc, Southwestern China

  • Xue-long LiuEmail author
  • Jian-hang Chen
  • Li Wen-chang 
  • Na Zhang
  • Shuai-shuai Wang
  • Chang-zhen Zhang
  • Ying Luo
  • Zhen-huan Li
  • Fu-cheng Yang
Original Paper
  • 34 Downloads

Abstract

The Geza arc is an important part of the Yidun arc belt and porphyry metallogenic zone in the Sanjiang region, Southwestern China. In this paper, we report on new laser-ablation inductively coupled plasma–mass spectroscopy zircon U–Pb age and bulk geochemical and Hf isotopic data of the Tongchanggou granodioritic porphyries from the Geza arc. The results indicate that these intrusions were emplaced in the Late Cretaceous (87.6 ± 0.6–83.6 ± 1.1 Ma). The intrusive rocks have SiO2, Al2O3, and K2O + Na2O contents of 62.51–72.86, 11.43–16.30, and 5.32–7.81 wt%, respectively, similar to those of high-K calc-alkaline rock. They are enriched in large-ion lithophile elements (e.g., K, U, Th, Rb, Ba, and Sr) and light rare-earth elements (LREE (light rare-earth elements)/HREE (heavy rare-earth elements) = 16.96–24.78), but depleted in high-field-strength elements (e.g., Nb, Ta, P, and Ti) and HREE, with a slightly negative Eu anomaly (δEu = 0.72–0.89). The intrusions show uniformly negative εHf (t) values between − 9.55 and − 3.49. These elemental geochemical and Hf isotopic data indicate that the Tongchanggou porphyries were mainly derived from partial melting of the delaminated lower crust in an extensional setting at the post-collisional stage. The collision-induced upwelling of the lithospheric mantle led to the partial melting of the crust and formed the potassium-rich and Mo-bearing parental magma. Magma rising and intruding along the deep faults eventually resulted in the Late Cretaceous tectonic–magmatic and Mo-polymetallic mineralization in Geza area.

Keywords

Geochemistry Zircon U–Pb dating and Hf isotope Magmatism and mineralization Late Cretaceous Tongchanggou intrusion Geza arc Yunnan province 

Notes

Funding information

This study was financially supported by the National Natural Science Foundation of China (Grant No. 41862009, 41502076), the Key Laboratory of Geological Information Technology, the Ministry of Natural Resources of the People’s Republic of China (Grant No. KKF0201821043), the Science and Technology Award of Yunnan Province-Outstanding Contribution Award Project (Grant No. 2007001), and the Technological Leading Talents Program of Yunnan Province (Grant No. 2013HA001).

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Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  • Xue-long Liu
    • 1
    • 2
    Email author
  • Jian-hang Chen
    • 1
  • Li Wen-chang 
    • 1
    • 3
  • Na Zhang
    • 1
  • Shuai-shuai Wang
    • 1
    • 2
  • Chang-zhen Zhang
    • 1
  • Ying Luo
    • 1
  • Zhen-huan Li
    • 1
  • Fu-cheng Yang
    • 1
  1. 1.Kunming University of Science and TechnologyKunmingChina
  2. 2.Key Laboratory of Sanjiang Mineralization and Resource Exploration and UtilizationMinistry of Land and ResourcesKunmingChina
  3. 3.Chengdu CenterChina Geological SurveyChengduChina

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