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Distinctive features of Late Palaeozoic massive sulphide deposits in South China

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Gu, L and Zaw, K and Hu, W and Zhang, K and Ni, P and He, J and Xu, Y and Lu, J and Lin, C (2007) Distinctive features of Late Palaeozoic massive sulphide deposits in South China. Ore Geology Reviews, 31 (1 - 4). pp. 107-138. ISSN 0169-1368

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Abstract

More than 20 sediment-hosted massive sulphide deposits occur in Late Palaeozoic basins in South China. These deposits are
accompanied by a certain amount of volcanic rocks in the host sequence and are economically important for their Cu, Pb, Zn, Au
and Ag reserves. The deposits and their host strata were commonly intruded by Mesozoic granitoids. Remobilisation of
sedimentary ores and magmatic hydrothermal overprinting processes resulted in the coexistence of massive sulphides with vein-,
skarn- and porphyry-type orebodies in the same region or within a single deposit. The ore-containing basins occur in different
tectonic settings. The Lower Yangtze basin occurs on a passive continental margin, where the deposits are high in Cu and Au with
minor Pb and Zn and recoverable Ag, Co and Mo. The ores have a lower concentration of radiogenic lead, and δ34S values close to
zero. Fluid inclusions are highly saline and Na-rich. Fluids and metals of the Lower Yangtze Region are interpreted to have been
derived essentially from deep sources including the Precambrian basement. By contrast, basins of the Nanling Region formed in an
intracontinental setting developed on a folded Caledonian basement. These deposits are higher in Pb, Zn, Sn and W, as well as Cu,
with recoverable Ag, Sb, Hg, U, Bi, Tl and Mo. The ores are characterised by a higher concentration of radiogenic lead and a wide
variation of δ34S composition. Fluid inclusions have lower salinities and higher K+/Na+ ratios. Fluids are considered to have been
sourced substantially from seawater by convection. Metals for the Nanling deposits were essentially derived from the Caledonian
basement by leaching. The contrast in ore composition between these two regions appears to have been controlled by differences in
basement composition of the ore-forming basins.

Item Type: Article
Keywords: Massive sulphide; Stratabound; Stratiform; Submarine exhalation; South China
Journal or Publication Title: Ore Geology Reviews
Page Range: pp. 107-138
ISSN: 0169-1368
Identification Number - DOI: 10.1016/j.oregeorev.2005.01.002
Additional Information:

The definitive version is available at http://www.sciencedirect.com

Date Deposited: 16 Jun 2008 23:24
Last Modified: 18 Nov 2014 03:42
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