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author:

Li, D. (Li, D..) [1] | Qiu, X. (Qiu, X..) [2] | Zhang, W. (Zhang, W..) [3] | Liu, W. (Liu, W..) [4] | Yu, B. (Yu, B..) [5]

Indexed by:

Scopus PKU CSCD

Abstract:

The isotopic ages of the main porphyraceous granodiorite at the deep part of the Zijinshan orefield of Fujian province, China, were dated by using in-site zircon SHRIMP U-Pb method and hornblende and potassium feldspar 40Ar/39Ar method. The 206Pb/238U weighted average ages of the zircons from three samples are 102.8±1.5 Ma (n=13, MSWD=0.67), 102.4±1.7 Ma (n=9, MSWD=0.73), 100.4±1.8 Ma (n=12, MSWD=1.2), respectively. The three samples as whole yielded a weighted average age of 101.8±1.5 Ma (n=34, MSWD=1.0), which most likely represents the age of crystallization of the porphyraceous granodiorite. The 40Ar/39Ar dating of two hornblende and two potassium feldspar samples yielded isochron ages of 100±11 Ma, 102.2 Ma, 96.3±1.7 Ma, and 98.5 Ma, respectively. Based on the theory of mineral sealing temperature, the cooling rate of the rocks of the main porphyraceous granodiorite at the deep part of the Zijinshan orefield is estimated to be about 40.7~67.1℃/Ma from crystallization of zircon to closure of hornblende 40Ar/39Ar system, 116.9~216.3℃/Ma from closure of hornblende 40Ar/39Ar system to closure of potassium feldspar 40Ar/39Ar system. Both of the estimated cooling rates of the rock are rather high. In comparison with the paleogeothermal gradient, the pluton uplift and exhumed 3 km from crystallization (101.8±1.5 Ma) to the closure of potassium feldspar 40Ar/39Ar system (96.3±1.7 Ma), suggestive of rapid uplift and exhumation during this period. The dating results show that there is a large batholith at the deep part of the Zijinshan ore field which contributed to the porphyry mineralization. Single mineral 40Ar/39Ar dating results provided meaningful constraints on the uplift and exhumation of the deposit. © 2016, Science Press. All right reserved.

Keyword:

40Ar/39Ar dating; Porphyraceous granodiorite; Rock cooling; Zijinshan orefield; Zircon SHRIMP U-Pb dating

Community:

  • [ 1 ] [Li, D.]College of Zijin Mining, Fuzhou University, Fuzhou, Fujian 350108, China
  • [ 2 ] [Qiu, X.]College of Zijin Mining, Fuzhou University, Fuzhou, Fujian 350108, China
  • [ 3 ] [Qiu, X.]Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China
  • [ 4 ] [Zhang, W.]College of Zijin Mining, Fuzhou University, Fuzhou, Fujian 350108, China
  • [ 5 ] [Liu, W.]College of Zijin Mining, Fuzhou University, Fuzhou, Fujian 350108, China
  • [ 6 ] [Yu, B.]Geological Construction Engineering Group of Guangdong Province, Guangzhou, Guangdong 510080, China

Reprint 's Address:

  • [Qiu, X.]College of Zijin Mining, Fuzhou UniversityChina

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Source :

Geotectonica et Metallogenia

ISSN: 1001-1552

Year: 2016

Issue: 4

Volume: 40

Page: 783-797

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 7

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 2

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