TY - JOUR

T1 - Geology, mineralogy, geochemistry and δ34S of sedimentary rock-hosted Au deposits in Song Hien structure, NE Vietnam

AU - Nevolko, Peter A.

AU - Hoa, Tran Trong

AU - Redin, Yury O.

AU - Anh, Tran Tuan

AU - Phuong, Ngo Thi

AU - Vu Hoang, Ly

AU - Dultsev, Vladislav F.

AU - Pham Thi, Dung

AU - Huong, Ngo Thi

PY - 2017/4/1

Y1 - 2017/4/1

N2 - The Song Hien rift basin is considered to be one of the most important regions of gold mineralisation in North East Vietnam. A number of gold deposits in the Song Hien rift basin are hosted in Triassic and Devonian sedimentary formations of the basin. The largest among them are the Bo Va, Tham Riem and Khung Khoang deposits. The Bo Va deposit is hosted in carbonaceous sedimentary rocks of Triassic age, whereas the Tham Riem and Khung Khoang deposits are hosted in carbonaceous sedimentary rocks of Devonian ages. Based on the mineral composition of the ores, the deposits can be divided into to two types: (i) pyrite dominated and (ii) pyrite-arsenopyrite dominated. The Khung Khoang is of the first type and the Bo Va and Tham Riem deposits belong to the second type. The isotopic composition of pyrite and arsenopyrite in the Tham Riem deposit however, is close to that for the ores of the Bo Va deposit. The δ34S value for pyrite ranging from −3.7‰ to −7.4‰ and for arsenopyrite ranging from −3.2‰ to 7.4‰. The δ34S of pyrite in the ore from the Khung Khoang deposit however, has a much heavier isotopic composition of +18.9 to +20.2‰. A narrow range of the variation of sulfur isotopic composition of pyrite and arsenopyrite, the presence of visible gold as inclusions, the presence of chalcopyrite, sphalerite and other inclusions in arsenopyrite and pyrite, the large size of the grains of major ore minerals allow us to assume that the primary gold ores of the Bo Va and Tham Riem deposits underwent metamorphic transformations. The absence of arsenic, antimony, mercury and other characteristic elements in the ores of the Khung Khoang deposit, and substantially heavier isotopic composition of sulfur similar to the sulfur isotopic composition of marine sulfates in the Devonian, allow us to assume another source of the ore components, not connected with the Triassic sedimentary rocks of the Song Hien rift.

AB - The Song Hien rift basin is considered to be one of the most important regions of gold mineralisation in North East Vietnam. A number of gold deposits in the Song Hien rift basin are hosted in Triassic and Devonian sedimentary formations of the basin. The largest among them are the Bo Va, Tham Riem and Khung Khoang deposits. The Bo Va deposit is hosted in carbonaceous sedimentary rocks of Triassic age, whereas the Tham Riem and Khung Khoang deposits are hosted in carbonaceous sedimentary rocks of Devonian ages. Based on the mineral composition of the ores, the deposits can be divided into to two types: (i) pyrite dominated and (ii) pyrite-arsenopyrite dominated. The Khung Khoang is of the first type and the Bo Va and Tham Riem deposits belong to the second type. The isotopic composition of pyrite and arsenopyrite in the Tham Riem deposit however, is close to that for the ores of the Bo Va deposit. The δ34S value for pyrite ranging from −3.7‰ to −7.4‰ and for arsenopyrite ranging from −3.2‰ to 7.4‰. The δ34S of pyrite in the ore from the Khung Khoang deposit however, has a much heavier isotopic composition of +18.9 to +20.2‰. A narrow range of the variation of sulfur isotopic composition of pyrite and arsenopyrite, the presence of visible gold as inclusions, the presence of chalcopyrite, sphalerite and other inclusions in arsenopyrite and pyrite, the large size of the grains of major ore minerals allow us to assume that the primary gold ores of the Bo Va and Tham Riem deposits underwent metamorphic transformations. The absence of arsenic, antimony, mercury and other characteristic elements in the ores of the Khung Khoang deposit, and substantially heavier isotopic composition of sulfur similar to the sulfur isotopic composition of marine sulfates in the Devonian, allow us to assume another source of the ore components, not connected with the Triassic sedimentary rocks of the Song Hien rift.

KW - Carbonaceous sedimentary rock-hosted gold deposit

KW - Geochemistry

KW - North East Vietnam

KW - Orogenic gold deposit

KW - Song Hien rift

KW - Sulfur isotopes

KW - GUIZHOU PROVINCE

KW - NANPANJIANG BASIN

KW - SOUTH CHINA BLOCK

KW - CARLIN-TYPE

KW - EMEISHAN PLUME

KW - Carbonaceous sedimentary rock-hosted

KW - OROGENIC GOLD DEPOSITS

KW - SULFUR ISOTOPES

KW - MINERALIZATION

KW - gold deposit

KW - NORTHERN VIETNAM

KW - CONSTRAINTS

UR - http://www.scopus.com/inward/record.url?scp=85010637397&partnerID=8YFLogxK

U2 - 10.1016/j.oregeorev.2016.12.032

DO - 10.1016/j.oregeorev.2016.12.032

M3 - Article

AN - SCOPUS:85010637397

VL - 84

SP - 273

EP - 288

JO - Ore Geology Reviews

JF - Ore Geology Reviews

SN - 0169-1368

ER -