Ar-Ar ages of gold deposits in the Song Hien domain (NE Vietnam): Tectonic settings and comparison with Golden Triangle in China in terms of a single metallogenic province

Peter A. Nevolko, Trong Hoa Tran, Denis S. Yudin, Thi Phuong Ngo

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11 Citations (Scopus)

Abstract

The Song Hien rift basin is an important metallogenic area in NE Vietnam. This domain consists mainly of Triassic sulfide-rich black shale beds, which play a role as a sedimentary host for various mineral systems such as antimony, mercury and gold-sulfide deposits. Most of gold deposits are hosted in carbonaceous sedimentary rocks, however some deposits, which have similar characteristics, are hosted in fine-grained mafic magmatic rocks. An Ar-Ar isotopic dating of hydrothermal sericite from the sedimentary hosted Bo Va and Khung Khoang gold deposits and intrusion hosted orogenic Hat Han gold deposit yields plateau ages of 184.8 ± 2.1 Ma, 211.63 ± 2.3 Ma, and 209.12 ± 2.3 Ma, respectively. The obtained Ar-Ar ages convincingly show that the orogenic gold deposits in the Song Hien domain were formed in Late Triassic to Early Jurassic, while the age of the Bo Va deposit is at least older than 184.8 ± 2.1 Ma. Loss of argon by volume diffusion, supported by previously reported mineralogical and isotopic features of the Bo Va deposit may suggest that the Jurassic-Cretaceous (Yanshanian) tectonothermal events overprinted some deposits in the Song Hien domain. Formation of gold deposits in the Song Hien domain is linked to the same tectonic event as the Carlin-like gold deposits in SW China and is associated with an extensional tectonic regime that followed continental collision between the Indochina and South China Blocks. The similarity in geology setting and mineral composition of gold deposits of the Song Hien domain and the Golden Triangle region, as well as timing and kinematics of deformation, magmatic features, and stratigraphic sequence and bulk architecture, lead to conclusion that NE Vietnam and SW China is a single metallogenic zone. The study of gold deposits in Vietnam will provide a new data on the metallogenic history of this important part of SE Asia.

Original languageEnglish
Pages (from-to)544-556
Number of pages13
JournalOre Geology Reviews
Volume89
DOIs
Publication statusPublished - 1 Oct 2017

Keywords

  • Ar-Ar dating
  • Indosinian orogeny
  • Northeastern Vietnam
  • Orogenic gold deposit
  • Song Hien domain
  • GUIZHOU PROVINCE
  • HOSTED AU DEPOSITS
  • YUNNAN PROVINCE
  • MESOZOIC GRANITOIDS
  • NANPANJIANG BASIN
  • CARLIN-TYPE
  • TRIASSIC TECTONICS
  • INDO-CHINA
  • NORTHERN VIETNAM
  • SOUTH CHINA

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