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Licensed Unlicensed Requires Authentication Published by De Gruyter February 28, 2021

Fluid source and metal precipitation mechanism of sediment-hosted Chang’an orogenic gold deposit, SW China: Constraints from sulfide texture, trace element, S, Pb, and He-Ar isotopes and calcite C-O isotopes

  • Lin Yang , Qingfei Wang ORCID logo EMAIL logo , Ross R. Large , Indrani Mukherjee ORCID logo , Jun Deng , Huajian Li , Huazhi Yu and Xuan Wang
From the journal American Mineralogist

Abstract

The source of fluids and their mechanism of metal precipitation in sediment-hosted, disseminated orogenic gold deposits are ambiguous. Pyrite texture, trace element, S, Pb, and He-Ar isotope compositions of sulfides and C-O isotope data of calcite from Chang’an orogenic gold deposit in the Ailaoshan orogenic belt, southwest (SW) China, were studied to provide a new genetic model for the sediment-hosted orogenic gold deposit, furthering knowledge of the source of fluids and their mechanism of metal precipitation. Orebodies at Chang’an are mainly hosted by Ordovician turbidite with a few in Oligocene syenite. Two stages of mineralization have been identified in the deposit: stage I disseminated quartz-arsenopyrite-pyrite and stage II veined quartz-calcite-polymetallic sulfides. Five generations of pyrite have been identified in turbidite: pre-ore syn-sedimentary pyrite, pyI-1 and pyI-2 in stage I, and pyII-1 and pyII-2 in stage II, and an unzoned pyrite population developed in syenite. PyI-1 commonly overgrows syn-sedimentary pyrite with irregular boundaries and contains arsenopyrite, galena, chalcopyrite, and electrum inclusions along the boundaries. PyI-1 is overgrown by thin and inclusion-free pyI-2, and crosscut by pyII-1, which is rimmed by pyII-2.

The syn-sedimentary pyrite is distributed parallel to the sedimentary bedding and contains As (620.8 ppm), Pb (61.6 ppm), Ni (59.8 ppm), Mo (54.4 ppm), Co (23.4 ppm), and Cu (13.0 ppm) with low-Au content of 0.06 ppm. This pyrite has δ34S values of –18.1 to +30.4‰ and high-radiogenic Pb isotope ratios (average 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb of 19.05, 15.86, and 39.87, respectively). PyI-1 and coexisting arsenopyrite are enriched in invisible Au (up to 227.1 and 353.3 ppm, respectively), As, Ni, Cu, and Pb, while pyI-2 contain much lower trace element abundances relative to pyI-1 and arsenopyrite. Partial replacement of syn-sedimentary pyrite by pyI-1 plus arsenopyrite, galena, chalcopyrite, and electrum, and similar Pb isotope ratios between syn-sedimentary pyrite and pyI-1 indicate that reaction of external deep Au-rich fluids with syn-sedimentary pyrite is responsible for gold precipitation in stage I. PyI-1, arsenopyrite, and pyI-2 show a narrower δ34S range of –3.2 to 7.1‰ relative to syn-sedimentary pyrite, demonstrating that the fluid-pyrite interaction has homogenized the sulfur. The unzoned pyrite in syenite has similar mineral inclusions (arsenopyrite, galena, etc.), δ34S values (+0.6 to 6.3‰) and Pb isotope ratios to pyI-1, but much lower trace element abundances relative to pyI-1. It may be attributed to different reactions of similar fluids with different wall-rocks. PyII-1 and pyII-2 in stage II contain elevated As, Pb, Cu, Sb, Zn, and Ag with low mean Au content (3.3 ppm) and have δ34S ranges of –2.8 to +1.2‰ and –6.2 and –0.8‰, respectively. Galena in stage II has lower radiogenic Pb isotope ratios than stage I pyrites, indicative of a diferent Pb source or fluid evolution. The gases released from a mixture of pyII-1-pyII-2 have R/Ra of 0.38 to 0.98 and 40Ar*/4He of 0.50 to 1.34, falling between the fields of mantle-derived and crustal fluids. Late ore calcites have δ13CPDB of –8.7 to 2.7‰ and δ18OSMOW of 8.05 to 25.58‰, also plotting between sedimentary carbonate and mantle fields. These signatures indicate that ore fluids in stage II are base metal-rich fluids with a small amount of contribution from the mantle. Different ore assemblages, trace element composition and isotope data between stages I and II at Chang’an suggest that the deposit experienced an evolution from early Au-rich fluids to late base metal-rich ones. This study highlights that ore metals in sediment-hosted disseminated orogenic gold deposits may be sourced from both deep fluids and local wall-rock, and that fluid-rock interaction behaved as a key control on ore precipitation.

Acknowledgments and funding

We thank the Callum J. Hetherington for handling of the manuscript and crucial comments, and Robert Scott and two anonymous reviewers for constructive comments. We appreciate Paul Olin, Sasha Stepanov, Lejun Zhang, and Xin Xiao for their suggestions and help for the LA-ICP-MS analyses of sulfides and Bin Fu for his assistance for SHRIMP sulfur isotope of sulfides. This research was jointly supported by the National Key Research and Development Project of China (2016YFC0600307, 2020YFA0714802), the National Natural Science Foundation of China (91855217), the Chinese Post-doctoral Innovative Talent Support Program (BX20180280), China Postdoctoral Science Foundation (2018M641428, 2020M680622), and the 111 Project of the Ministry of Science and Technology (BP0719021).

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Received: 2020-03-05
Accepted: 2020-07-08
Published Online: 2021-02-28
Published in Print: 2021-03-26

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