Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (2): 445-459.doi: 10.13278/j.cnki.jjuese.20170332

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LA-ICP-MS Zircon U-Pb Dating, Geochemiacal Features and Geological Significance of Erlangping Rock Mass in North Qinling Mountains

Liang Tao1,2, Lu Ren1,2, Wang Li1,2   

  1. 1. Henan Nonferous Metals Geological Exploration Institute, Zhengzhou 450052, China;
    2. Key Laboratory of Deep Ore-Prospecting Technology Research for Non-Ferrous Metals of Henan Province, Zhengzhou 450052, China
  • Received:2017-12-21 Online:2019-03-26 Published:2019-03-28
  • Supported by:
    Supported by National Natural Science Foundation of China(U1504405), Basic and Frontier Research Plan of Henan Province (162300410065) and Science and Technology Key Project of Bereau of Land and Resources of Henan Province (2016-08, 2014-06)

Abstract: Erlangping rock mass is in the east of Northern Qinling Mountains, and composed of porphyritic biotite monzonitic granite. The zircon U-Pb dating and geochemical features of Erlangping rock mass are significant to recognize the deep tectonic evolution of the northern Qinling Mountains in Late Mesozoic. The LA-ICP-MS zircon U-Pb dating results show that the formation age of Erlangping rock body is (114.0±0.5) Ma (MSWD=1.5). Erlangping rock mass is characterized by higher SiO2 and alkali, and lower MgO and CaO, and compositional spots fall into the high-K calc-alkaline series in the SiO2-K2O diagram. Erlangping rock mass are enriched in large ion lithophile elements and depleted of high field-strength elements, which formed peaks of Rb and Th, and troughs of Nb,Sr, P and Ti in spider diagram. In the chondrite-normalized REE patterns, Erlangping rock mass shows the characteristics of LREE-enrichment and HREE depletion with Eu negative anomaly, and the (La/Yb)N ratios are from 8.39 to 13.73. It suggests that the compositional change of Erlangping rock mass is controlled mainly by source composition and degree of partial melting. The partial melting source of Erlangping rock mass falls in amphibolite-facies with a crust thickness of about 40 km. The residual phases of partial melting source include mainly hornblende and plagioclase. Yanzhen regional lithosphere delamination took place in about 130 Ma, which triggered the deep magma intrusion in Erlangping area, and the later source rock partial melting and mixing with deep magma. They ascended and solidified in about 114 Ma. Erlangping rock mass is the product of delayed magmatism in about 15 Ma in response to the Yanzhen regional lithosphere delamination.

Key words: Erlangping body, U-Pb isotopic dating, lithosphere delamination, magma mixture, under plating, Northern Qinling Mountains

CLC Number: 

  • P597.3
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