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. / Nevolko, Peter A.; Tran, Trong Hoa; Yudin, Denis S. et al.
In: Ore Geology Reviews, Vol. 89, 01.10.2017, p. 544-556.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Ar-Ar ages of gold deposits in the Song Hien domain (NE Vietnam)
T2 - Tectonic settings and comparison with Golden Triangle in China in terms of a single metallogenic province
AU - Nevolko, Peter A.
AU - Tran, Trong Hoa
AU - Yudin, Denis S.
AU - Ngo, Thi Phuong
N1 - Publisher Copyright: © 2017 Elsevier B.V.
PY - 2017/10/1
Y1 - 2017/10/1
N2 - 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.
AB - 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.
KW - Ar-Ar dating
KW - Indosinian orogeny
KW - Northeastern Vietnam
KW - Orogenic gold deposit
KW - Song Hien domain
KW - GUIZHOU PROVINCE
KW - HOSTED AU DEPOSITS
KW - YUNNAN PROVINCE
KW - MESOZOIC GRANITOIDS
KW - NANPANJIANG BASIN
KW - CARLIN-TYPE
KW - TRIASSIC TECTONICS
KW - INDO-CHINA
KW - NORTHERN VIETNAM
KW - SOUTH CHINA
UR - http://www.scopus.com/inward/record.url?scp=85030478340&partnerID=8YFLogxK
U2 - 10.1016/j.oregeorev.2017.07.004
DO - 10.1016/j.oregeorev.2017.07.004
M3 - Article
AN - SCOPUS:85030478340
VL - 89
SP - 544
EP - 556
JO - Ore Geology Reviews
JF - Ore Geology Reviews
SN - 0169-1368
ER -
ID: 9054067