胶东地区破碎带蚀变岩型金矿时代的测定及其地质意义

Translated title of the contribution: Dating of gold mineralization for super-large altered tectonite-type gold deposits in Northwestern Jiaodong Peninsula and its implications for gold metallogeny

J. Yang*, X. Zhou, L. Chen

*Corresponding author for this work

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

In order to understand the genesis of ore deposits, it is fundamental to know the timing of gold deposition. Altered-tectonite-type gold deposits, occurred in northwestern Jiaodong Peninsula, containing several super-large gold ore deposits, is dated by Rb-Sr isochron and K-Ar method for gold-bearing altered tectonites and minerals at 117 ~ 100Ma. This age is significantly younger than that of emplacement of its host intrusions (160 ~ 150Ma for Linglong granites and 130 ~ 126Ma for Guojialing granodiorites), precluding the direct genetic link between gold mineralization and acidic magmatism. The 87Sr/86Sr initial ratio suggests that, although ore-forming materials of gold deposits were derived partly from Guojialing granodiorites, there exist other sources. It is, therefore, concluded that this type of gold deposit is not traditionally magmatic hydrothermal genesis, but the product of mixing fluids by meteoric water or manlte-derived C-H-O fluids after the emplacement of granitic and granodioritic intrusions.

Original languageChinese
Pages (from-to)454-458
Number of pages5
JournalYanshi Xuebao/Acta Petrologica Sinica
Volume16
Issue number3
Publication statusPublished - 2000
Externally publishedYes

Keywords

  • Altered rock
  • Altered tectonite-type gold ore deposit
  • Northwestern Jiaodong Peninsula
  • Rb-Sr isochron

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