World-class Xincheng gold deposit: An example from the giant Jiaodong gold province
The Jiaodong gold deposits are currently the most important gold resources (with Au reserves of >4000 t) in China, and the leading gold-producing country globally (with Au production of ∼428 t in 2013). Jiaodong is also considered as perhaps the only world-class to giant gold accumulation on the...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2016-05-01
|
| Series: | Geoscience Frontiers |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674987115000961 |
| _version_ | 1797715670144647168 |
|---|---|
| author | Liqiang Yang Jun Deng Ruipeng Guo Lin'nan Guo Zhongliang Wang Binghan Chen Xudong Wang |
| author_facet | Liqiang Yang Jun Deng Ruipeng Guo Lin'nan Guo Zhongliang Wang Binghan Chen Xudong Wang |
| author_sort | Liqiang Yang |
| collection | DOAJ |
| description | The Jiaodong gold deposits are currently the most important gold resources (with Au reserves of >4000 t) in China, and the leading gold-producing country globally (with Au production of ∼428 t in 2013). Jiaodong is also considered as perhaps the only world-class to giant gold accumulation on the planet where relatively young gold ores (ca. 130–120 Ma) were deposited in rocks that are 2 Ga older. The Xincheng world-class high-grade gold deposit, with a proven reserve of >200 t gold, is one of the largest deposits in the giant gold province of the Jiaodong Peninsula. It is located in the northwestern part of the Jiaobei Uplift, and hosted by ca. 132–123 Ma Xincheng quartz monzonites and monzogranites. Ore zones are structurally controlled by the NE-trending and NW-dipping Jiaojia Fault and subsidiary faults, and are mainly restricted to the footwall of the fault. The dominant disseminated- and stockwork-style ores are associated with strong sericitization, silicification, sulfidation and K-feldspathization, and minor carbonate wallrock alteration halos. The four mineralization stages are pyrite–quartz–sericite (stage 1), quartz–pyrite (stage 2), quartz–polysulfide (stage 3) and quartz–carbonate (stage 4). Gold occurs dominantly as electrum, with lesser amounts of sulfide-hosted native gold and rare native silver and argentite, normally associated with pyrite, chalcopyrite, galena and sphalerite: the latter with proven resources of about 105 t Ag, 713 t Cu, and 5100 t S.
There are three types of ore-related fluid inclusions: type 1 aqueous-carbonate (H2O–CO2), type 2 aqueous (liquid H2O + vapor H2O), and type 3 CO2 (liquid CO2 and vapor CO2) inclusions. Homogenization temperatures range from 221 to 304 °C for type 1 inclusions, with salinities of 2.4–13.3 wt.% NaCl eq., and bulk densities of 0.858–1.022 g/cm3. The δ34SCDT values of hydrothermal sulfides are 4.3–10.6‰ and δ18O values of hydrothermal quartz have a median value of 13.0‰. δD values of fluid inclusions in hydrothermal quartz have a median value of −75‰. Calculated δ18Owater has a median value of 5.2‰. The timing of gold mineralization at the Xincheng gold deposit is younger than 123 ± 1 Ma, and likely between 120.9 and 119.9 Ma.
A minerals system genetic model for the probable epizonal orogenic Xincheng deposit suggests an initial medium temperature, CO2-rich, and low salinity H2O–CO2 deeply sourced metamorphic ore fluid associated with dehydration and decarbonization of subducting Paleo-Pacific lithosphere. The Jiaojia Fault constrained the migration of ore-forming fluids and metals at the brittle–ductile transition. Fluid immiscibility, caused by episodic pressure drops, led to significant high-grade gold deposition in the giant Xincheng gold deposit. |
| first_indexed | 2024-03-12T08:10:07Z |
| format | Article |
| id | doaj.art-c67e029dcae14e76a9c1f6616cdd3e37 |
| institution | Directory Open Access Journal |
| issn | 1674-9871 |
| language | English |
| last_indexed | 2024-03-12T08:10:07Z |
| publishDate | 2016-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Geoscience Frontiers |
| spelling | doaj.art-c67e029dcae14e76a9c1f6616cdd3e372023-09-02T19:11:10ZengElsevierGeoscience Frontiers1674-98712016-05-017341943010.1016/j.gsf.2015.08.006World-class Xincheng gold deposit: An example from the giant Jiaodong gold provinceLiqiang Yang0Jun Deng1Ruipeng Guo2Lin'nan Guo3Zhongliang Wang4Binghan Chen5Xudong Wang6State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, ChinaState Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, ChinaShandong Institute of Geological Survey, Jinan 250013, ChinaState Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, ChinaState Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, ChinaState Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, ChinaXincheng Gold Company, Shandong Gold Mining Stock Co., Ltd., Laizhou City 261438, Shandong Province, ChinaThe Jiaodong gold deposits are currently the most important gold resources (with Au reserves of >4000 t) in China, and the leading gold-producing country globally (with Au production of ∼428 t in 2013). Jiaodong is also considered as perhaps the only world-class to giant gold accumulation on the planet where relatively young gold ores (ca. 130–120 Ma) were deposited in rocks that are 2 Ga older. The Xincheng world-class high-grade gold deposit, with a proven reserve of >200 t gold, is one of the largest deposits in the giant gold province of the Jiaodong Peninsula. It is located in the northwestern part of the Jiaobei Uplift, and hosted by ca. 132–123 Ma Xincheng quartz monzonites and monzogranites. Ore zones are structurally controlled by the NE-trending and NW-dipping Jiaojia Fault and subsidiary faults, and are mainly restricted to the footwall of the fault. The dominant disseminated- and stockwork-style ores are associated with strong sericitization, silicification, sulfidation and K-feldspathization, and minor carbonate wallrock alteration halos. The four mineralization stages are pyrite–quartz–sericite (stage 1), quartz–pyrite (stage 2), quartz–polysulfide (stage 3) and quartz–carbonate (stage 4). Gold occurs dominantly as electrum, with lesser amounts of sulfide-hosted native gold and rare native silver and argentite, normally associated with pyrite, chalcopyrite, galena and sphalerite: the latter with proven resources of about 105 t Ag, 713 t Cu, and 5100 t S. There are three types of ore-related fluid inclusions: type 1 aqueous-carbonate (H2O–CO2), type 2 aqueous (liquid H2O + vapor H2O), and type 3 CO2 (liquid CO2 and vapor CO2) inclusions. Homogenization temperatures range from 221 to 304 °C for type 1 inclusions, with salinities of 2.4–13.3 wt.% NaCl eq., and bulk densities of 0.858–1.022 g/cm3. The δ34SCDT values of hydrothermal sulfides are 4.3–10.6‰ and δ18O values of hydrothermal quartz have a median value of 13.0‰. δD values of fluid inclusions in hydrothermal quartz have a median value of −75‰. Calculated δ18Owater has a median value of 5.2‰. The timing of gold mineralization at the Xincheng gold deposit is younger than 123 ± 1 Ma, and likely between 120.9 and 119.9 Ma. A minerals system genetic model for the probable epizonal orogenic Xincheng deposit suggests an initial medium temperature, CO2-rich, and low salinity H2O–CO2 deeply sourced metamorphic ore fluid associated with dehydration and decarbonization of subducting Paleo-Pacific lithosphere. The Jiaojia Fault constrained the migration of ore-forming fluids and metals at the brittle–ductile transition. Fluid immiscibility, caused by episodic pressure drops, led to significant high-grade gold deposition in the giant Xincheng gold deposit.http://www.sciencedirect.com/science/article/pii/S1674987115000961Xincheng gold depositJiaodong PeninsulaChinaGiant gold systemGold genesisEpizonal orogenic gold |
| spellingShingle | Liqiang Yang Jun Deng Ruipeng Guo Lin'nan Guo Zhongliang Wang Binghan Chen Xudong Wang World-class Xincheng gold deposit: An example from the giant Jiaodong gold province Geoscience Frontiers Xincheng gold deposit Jiaodong Peninsula China Giant gold system Gold genesis Epizonal orogenic gold |
| title | World-class Xincheng gold deposit: An example from the giant Jiaodong gold province |
| title_full | World-class Xincheng gold deposit: An example from the giant Jiaodong gold province |
| title_fullStr | World-class Xincheng gold deposit: An example from the giant Jiaodong gold province |
| title_full_unstemmed | World-class Xincheng gold deposit: An example from the giant Jiaodong gold province |
| title_short | World-class Xincheng gold deposit: An example from the giant Jiaodong gold province |
| title_sort | world class xincheng gold deposit an example from the giant jiaodong gold province |
| topic | Xincheng gold deposit Jiaodong Peninsula China Giant gold system Gold genesis Epizonal orogenic gold |
| url | http://www.sciencedirect.com/science/article/pii/S1674987115000961 |
| work_keys_str_mv | AT liqiangyang worldclassxinchenggolddepositanexamplefromthegiantjiaodonggoldprovince AT jundeng worldclassxinchenggolddepositanexamplefromthegiantjiaodonggoldprovince AT ruipengguo worldclassxinchenggolddepositanexamplefromthegiantjiaodonggoldprovince AT linnanguo worldclassxinchenggolddepositanexamplefromthegiantjiaodonggoldprovince AT zhongliangwang worldclassxinchenggolddepositanexamplefromthegiantjiaodonggoldprovince AT binghanchen worldclassxinchenggolddepositanexamplefromthegiantjiaodonggoldprovince AT xudongwang worldclassxinchenggolddepositanexamplefromthegiantjiaodonggoldprovince |