Genesis of the Yangjiakuang gold deposit, Jiaodong peninsula, China: Constraints from S-He-Ar-Pb isotopes, and Sm-Nd and U-Pb geochronology
Located in the Penglai-Qixia-Fushan Gold Belt, the Yangjiakuang gold deposit formed in the marble of the Paleoproterozoic Fenzishan Group is different from the previous altered rock-type gold deposits whose host gold-bearing rocks are Archean gneiss and Mesozoic granite. Two gold orebodies have been...
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Frontiers Media S.A.
2023-01-01
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2023.1048509/full |
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| author | Jun-Jian Li Jun-Jian Li Zhi-Cai Dang Zhi-Cai Dang Chao Fu Chao Fu Peng-Peng Zhang Jie-Peng Tian Jiang-Tao He |
| author_facet | Jun-Jian Li Jun-Jian Li Zhi-Cai Dang Zhi-Cai Dang Chao Fu Chao Fu Peng-Peng Zhang Jie-Peng Tian Jiang-Tao He |
| author_sort | Jun-Jian Li |
| collection | DOAJ |
| description | Located in the Penglai-Qixia-Fushan Gold Belt, the Yangjiakuang gold deposit formed in the marble of the Paleoproterozoic Fenzishan Group is different from the previous altered rock-type gold deposits whose host gold-bearing rocks are Archean gneiss and Mesozoic granite. Two gold orebodies have been explored within the Yangjiakuang gold deposit, and both of them were controlled by the Yangjiakuang syncline. Three ore-forming stages have been recognized, including the pyrite-sericite stage (I), the gold, polymetallic sulfide, and quartz stage (II), and quartz-calcite stage (III). The calcites, which represent the main metallogenic stage (II) at Yangjiakuang gold deposit, yielded a Sm-Nd isochron age of 123.5 ± 8.1 Ma (MSWD = 0.042). Subsequent geologic events were recorded by quartz diorite porphyrite dyke which are dated at 122.75 ± 0.66 Ma (MSWD = 1.5) by zircon LA-ICP-MS U-Pb dating. It is suggested that the gold mineralization took place in the early period of Early Cretaceous. The in situ δ34S values of pyrites from two stages have a narrow range from + 5.65 to + 9.63‰ with an average value of 8.14‰, which indicate that the source of δ34S is related to the Guojialing granite and the Fenzishan Group. The lead isotopic compositions of pyrites (206Pb/204Pb = 16.615 to 16.832; 207Pb/204Pb = 15.275 to 15.403; 208Pb/204Pb = 36.829–37.470) show a consistent origin of the lower crust. The measured 3He/4He (40Ar/36Ar) of hydrothermal fluids in pyrites are 0.641–1.132 Ra (637.5–1162.7), indicating that the ore-forming fluid originating from a mixing of crustal and mantle components. It is suggested that the gold mineralization is associated with extensional tectonic inversion caused by the rollback of the subducting Izanagi Plate during the early Cretaceous, which triggered partial melting of mantle and lower crust, and subsequent magma mixing and exsolution of ore-bearing fluids. These fluids extracted ore-forming materials from the enclosing rocks of the Jiaodong Group, the Fenzishan Group, and the Guojialing granite to form the ore-forming fluids. |
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| spelling | doaj.art-a696b2b170b140759d5c30d14e8a2b392023-01-27T04:43:36ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632023-01-011110.3389/feart.2023.10485091048509Genesis of the Yangjiakuang gold deposit, Jiaodong peninsula, China: Constraints from S-He-Ar-Pb isotopes, and Sm-Nd and U-Pb geochronologyJun-Jian Li0Jun-Jian Li1Zhi-Cai Dang2Zhi-Cai Dang3Chao Fu4Chao Fu5Peng-Peng Zhang6Jie-Peng Tian7Jiang-Tao He8Tianjin Center, China Geological Survey, Tianjin, ChinaNorth China Center for Geoscience Innovation, China Geological Survey, Tianjin, ChinaTianjin Center, China Geological Survey, Tianjin, ChinaNorth China Center for Geoscience Innovation, China Geological Survey, Tianjin, ChinaTianjin Center, China Geological Survey, Tianjin, ChinaNorth China Center for Geoscience Innovation, China Geological Survey, Tianjin, ChinaInstitute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Science, Langfang, ChinaSchool of Civil Engineering, Shandong Jianzhu University, Jinan, ChinaInstitute of Geological Surveying, Hebei GEO University, Shijiazhuang, ChinaLocated in the Penglai-Qixia-Fushan Gold Belt, the Yangjiakuang gold deposit formed in the marble of the Paleoproterozoic Fenzishan Group is different from the previous altered rock-type gold deposits whose host gold-bearing rocks are Archean gneiss and Mesozoic granite. Two gold orebodies have been explored within the Yangjiakuang gold deposit, and both of them were controlled by the Yangjiakuang syncline. Three ore-forming stages have been recognized, including the pyrite-sericite stage (I), the gold, polymetallic sulfide, and quartz stage (II), and quartz-calcite stage (III). The calcites, which represent the main metallogenic stage (II) at Yangjiakuang gold deposit, yielded a Sm-Nd isochron age of 123.5 ± 8.1 Ma (MSWD = 0.042). Subsequent geologic events were recorded by quartz diorite porphyrite dyke which are dated at 122.75 ± 0.66 Ma (MSWD = 1.5) by zircon LA-ICP-MS U-Pb dating. It is suggested that the gold mineralization took place in the early period of Early Cretaceous. The in situ δ34S values of pyrites from two stages have a narrow range from + 5.65 to + 9.63‰ with an average value of 8.14‰, which indicate that the source of δ34S is related to the Guojialing granite and the Fenzishan Group. The lead isotopic compositions of pyrites (206Pb/204Pb = 16.615 to 16.832; 207Pb/204Pb = 15.275 to 15.403; 208Pb/204Pb = 36.829–37.470) show a consistent origin of the lower crust. The measured 3He/4He (40Ar/36Ar) of hydrothermal fluids in pyrites are 0.641–1.132 Ra (637.5–1162.7), indicating that the ore-forming fluid originating from a mixing of crustal and mantle components. It is suggested that the gold mineralization is associated with extensional tectonic inversion caused by the rollback of the subducting Izanagi Plate during the early Cretaceous, which triggered partial melting of mantle and lower crust, and subsequent magma mixing and exsolution of ore-bearing fluids. These fluids extracted ore-forming materials from the enclosing rocks of the Jiaodong Group, the Fenzishan Group, and the Guojialing granite to form the ore-forming fluids.https://www.frontiersin.org/articles/10.3389/feart.2023.1048509/fullS-He-Ar-Pb isotopesSm-Nd isochron ageLA-ICP-MS zircon U-Pb datingYangjiakuang gold depositJiaodong peninsula |
| spellingShingle | Jun-Jian Li Jun-Jian Li Zhi-Cai Dang Zhi-Cai Dang Chao Fu Chao Fu Peng-Peng Zhang Jie-Peng Tian Jiang-Tao He Genesis of the Yangjiakuang gold deposit, Jiaodong peninsula, China: Constraints from S-He-Ar-Pb isotopes, and Sm-Nd and U-Pb geochronology Frontiers in Earth Science S-He-Ar-Pb isotopes Sm-Nd isochron age LA-ICP-MS zircon U-Pb dating Yangjiakuang gold deposit Jiaodong peninsula |
| title | Genesis of the Yangjiakuang gold deposit, Jiaodong peninsula, China: Constraints from S-He-Ar-Pb isotopes, and Sm-Nd and U-Pb geochronology |
| title_full | Genesis of the Yangjiakuang gold deposit, Jiaodong peninsula, China: Constraints from S-He-Ar-Pb isotopes, and Sm-Nd and U-Pb geochronology |
| title_fullStr | Genesis of the Yangjiakuang gold deposit, Jiaodong peninsula, China: Constraints from S-He-Ar-Pb isotopes, and Sm-Nd and U-Pb geochronology |
| title_full_unstemmed | Genesis of the Yangjiakuang gold deposit, Jiaodong peninsula, China: Constraints from S-He-Ar-Pb isotopes, and Sm-Nd and U-Pb geochronology |
| title_short | Genesis of the Yangjiakuang gold deposit, Jiaodong peninsula, China: Constraints from S-He-Ar-Pb isotopes, and Sm-Nd and U-Pb geochronology |
| title_sort | genesis of the yangjiakuang gold deposit jiaodong peninsula china constraints from s he ar pb isotopes and sm nd and u pb geochronology |
| topic | S-He-Ar-Pb isotopes Sm-Nd isochron age LA-ICP-MS zircon U-Pb dating Yangjiakuang gold deposit Jiaodong peninsula |
| url | https://www.frontiersin.org/articles/10.3389/feart.2023.1048509/full |
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