Genesis of the Zhengchong Gold Deposit in Northeast Hunan—Constraints from Geochronology and In-situ Sulfur Isotope
Received date: 2022-12-08
Revised date: 2023-01-20
Online published: 2023-04-27
The Zhengchong gold deposit is a typical gold deposit in northeast Hunan.Its orebodies are controlled by NNE and NW trending faults and occur in Lengjiaxi Group with low metamorphism.The ore-forming age and the source of ore-forming materials are still controversial.In this study,by using the LA-(MC)-ICP-MS analysis method,in situ Rb-Sr dating of sericite in gold-bearing quartz vein and in situ S isotope analysis of pyrite were carried out to determine the ore-forming age and source of ore-forming materials,so as to clarify the genesis of the deposit.According to the ore-vein interpenetrating relationship of ore-veins and mineral paragenesis, the mineralization can be divided into three ore-forming stages,namely quartz-pyrite-gold stage,quartz-pyrite-arsenopyrite-polymetallic sulfide stage,quartz-calcite stage.Microscopic observation show that sericite in stage 1 and stage 2 had a close intergrow with pyrite/arsenopyrite.In situ Rb-Sr dating of sericite show that the ore-forming ages of stage 1 and stage 2 were (219.1±6.0)Ma and (215.8±7.7)Ma,respectively.Three kinds of pyrite were identified under the backscattering (BSE) image.The pyrite (Py1) in stage 1 is mainly eudedral and medium-coarse-grained,with δ 34S ranging from -3.86‰ to 1.03‰.The pyrite (Py2) in stage 2 has an euhedral,mesocoarse-grained structure and an obvious core-rim zonation.The core (Py2a) is uniform in the BSE image with δ 34S ranging from -1.43‰ to 1.51‰,while the edge (Py2b) has an obvious oscillation zone and other sulfide (galena) inclusions,with δ 34S ranging from -3.21‰ to 1.95‰.The δ 34S values (-3.85‰~1.95‰) of the three types of pyrite are close to 0 and the negative value moves to positive value,indicating that deep magmatic (or mantle-derived) materials may be the main source of ore-forming materials in Zhengchong gold deposit,and a small amount of stratigraphic material is involved in the mineralization.Based on the geological characteristics,metallogenic chronology and sulfur isotope geochemistry,We believe that the Zhengchong gold deposit was formed in the Indosinian intracontinental orogenic environment and related to deep magmatic activity.
Huahao WU , Yongjun SHAO , Qingquan LIU , Zhilin WANG , Yuce ZHANG , Zikun YUAN . Genesis of the Zhengchong Gold Deposit in Northeast Hunan—Constraints from Geochronology and In-situ Sulfur Isotope[J]. Gold Science and Technology, 2023 , 31(2) : 190 -205 . DOI: 10.11872/j.issn.1005-2518.2023.02.181
山东黄金2022年7家矿山产量创新高
2023年3月29日,山东黄金矿业股份有限公司发布2022年年度报告,实现营业收入503.06亿元,同比增长48.24%,净利润14.23亿元,同比增长828.42%,实现归属于上市公司股东的净利润12.46亿元,同比增长743.23%。截至2022年末,山东黄金净资产为366.96亿元,与去年同期相比增长15.45%,资产负债率为59.55%,经营活动产生的现金流量净额为29.72亿元,同比增长63.08%。
2022年,山东黄金矿产金产量38.673 t,同比增加13.892 t,增幅56.06%。2022年,山东黄金原矿入选品位1.23 g/t,同比增加0.11 g/t,其中地下矿山原矿入选品位1.84 g/t,同比增加0.09 g/t,增幅5.43%,主要原因是各矿山产能快速恢复,高品位资源得到有效利用;露天矿山原矿入选品位0.74 g/t,同比下降0.03 g/t,降幅3.89%,主要原因是新疆金川矿业和阿根廷贝拉德罗金矿地质资源品位下降。
因山东省新一轮生态保护红线划定影响公司权证办理进度,在生态保护红线方案批复后,玲珑金矿的玲珑矿区于2022年12月取得延续后的采矿许可证,截至本报告出具日玲珑矿区尚在办理安全生产许可证,未复工复产;东风矿区于2022年12月取得延续后的采矿许可证及安全生产许可证,2023年1月复产;蓬莱矿业于2022年4月底复产。
2022年,山东黄金主要开展了八方面工作:一是聚力抓好生产运营。二是聚力加快权证办理。三是聚力强化改革创新。四是聚力提速项目建设。五是聚力深化降本增效。六是聚力推进资本运作。七是聚力抓好安全环保。八是聚力加强党的建设。
2023年,山东黄金确定的生产经营计划是:黄金产量不低于39.641 t。拟采取的主要措施是聚焦提升产量效益,打造项目建设“强引擎”,不断夯实资源基础,持续激发创新动力,进一步提升发展质量,扎实提升本质安全水平,扎实提升本质安全水平。
http://www.goldsci.ac.cn/article/2023/1005-2518/1005-2518-2023-31-2-190.shtml
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