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Origin of Cu in the PACMANUS hydrothermal field from the eastern Manus back-arc basin: evidence from mass balance modeling.(Report)

Keywords: back-arc basin; mass balance model; PACMANUS hydrothermal field; source of Cu Abstract: Hydrothermal precipitates associated with active vents in the eastern Manus Basin, an actively opening back-arc basin in the Bismarck Sea, Papua New Guinea, are among the most Cu-rich on the modern seaf... Full description

Journal Title: Acta Oceanologica Sinica 2019, Vol.38(9), p.59(12)
Main Author: Ma, Yao
Other Authors: Wang, Xiaoyuan , Chen, Shuai , Yin, Xuebo , Zhu, Bowen , Guo, Kun , Zeng, Zhigang
Format: Electronic Article Electronic Article
Language: English
Subjects:
Quelle: Cengage Learning, Inc.
ID: ISSN: 0253-505X ; DOI: 10.1007/s13131-019-1475-z
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title: Origin of Cu in the PACMANUS hydrothermal field from the eastern Manus back-arc basin: evidence from mass balance modeling.(Report)
format: Article
creator:
  • Ma, Yao
  • Wang, Xiaoyuan
  • Chen, Shuai
  • Yin, Xuebo
  • Zhu, Bowen
  • Guo, Kun
  • Zeng, Zhigang
subjects:
  • Volcanic Rocks – Models
  • Volcanic Rocks – Analysis
  • Leaching – Models
  • Leaching – Analysis
  • Geochronology – Models
  • Geochronology – Analysis
  • Mineral Deposits – Models
  • Mineral Deposits – Analysis
  • Copper (Metal) – Models
  • Copper (Metal) – Analysis
  • Hydrothermal Fluids – Models
  • Hydrothermal Fluids – Analysis
  • Sulfides – Models
  • Sulfides – Analysis
ispartof: Acta Oceanologica Sinica, 2019, Vol.38(9), p.59(12)
description: Keywords: back-arc basin; mass balance model; PACMANUS hydrothermal field; source of Cu Abstract: Hydrothermal precipitates associated with active vents in the eastern Manus Basin, an actively opening back-arc basin in the Bismarck Sea, Papua New Guinea, are among the most Cu-rich on the modern seafloor. The volcanic rocks associated with this mineralization may be insufficiently enriched in Cu to account for the Cu content of the sulfides by simple leaching. The PACMANUS hydrothermal field lies in the eastern portion of the eastern Manus Basin. Mass balance modeling of the PACMANUS hydrothermal system indicates that simple leaching of a stationary reaction zone (0.144 km.sup.3) by hydrothermal fluids cannot yield the Cu found in associated sulfide deposits because unacceptably high leaching, transportation and precipitation efficiencies are required to derive the Cu in sulfides by leaching processes. With 100% leaching, transport and precipitating efficiency, 0.166 km.sup.3 of volcanic rocks would need to be leached to account for the Cu budget of hydrothermal sulfide deposits. The key requirement for forming metal-rich magmatic fluids is a large amount of metals available to enter the exsolved vapor phase. Magmas generated in the eastern Manus Basin inherently have high fO.sub.2 because of metasomatism of the mantle source by oxidized materials from the subducted slab, leading to copper enrichment in the magma chamber. Moreover, the presence of Cu in gas-rich melt inclusi on bubbles in Pual Ridge andesite is evidence that degassing and partitioning of Cu into the magmatic volatile phase has occurred in the eastern Manus Basin. Numerical mass balance modeling indicates that approximately 0.236 Mt Cu was potentially transferred to the hydrothermal system per cubic kilometer magma. Magmatic degassing seems to play a more significant role than leaching. Author Affiliation: (1) 0000000119573309, grid.9227.e, Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China (2) Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, 266071, China (3) 0000 0004 1797 8419, grid.410726.6, University of Chinese Academy of Sciences, Beijing, 100049, China (4) Ocean Science Isotope and Geochronology Center, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, 266071, China Article History: Registration Date: 04/09/2
language: eng
source: Cengage Learning, Inc.
identifier: ISSN: 0253-505X ; DOI: 10.1007/s13131-019-1475-z
fulltext: fulltext
issn:
  • 0253-505X
  • 0253505X
url: Link


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titleOrigin of Cu in the PACMANUS hydrothermal field from the eastern Manus back-arc basin: evidence from mass balance modeling.(Report)
creatorMa, Yao ; Wang, Xiaoyuan ; Chen, Shuai ; Yin, Xuebo ; Zhu, Bowen ; Guo, Kun ; Zeng, Zhigang
ispartofActa Oceanologica Sinica, 2019, Vol.38(9), p.59(12)
identifierISSN: 0253-505X ; DOI: 10.1007/s13131-019-1475-z
subjectVolcanic Rocks – Models ; Volcanic Rocks – Analysis ; Leaching – Models ; Leaching – Analysis ; Geochronology – Models ; Geochronology – Analysis ; Mineral Deposits – Models ; Mineral Deposits – Analysis ; Copper (Metal) – Models ; Copper (Metal) – Analysis ; Hydrothermal Fluids – Models ; Hydrothermal Fluids – Analysis ; Sulfides – Models ; Sulfides – Analysis
descriptionKeywords: back-arc basin; mass balance model; PACMANUS hydrothermal field; source of Cu Abstract: Hydrothermal precipitates associated with active vents in the eastern Manus Basin, an actively opening back-arc basin in the Bismarck Sea, Papua New Guinea, are among the most Cu-rich on the modern seafloor. The volcanic rocks associated with this mineralization may be insufficiently enriched in Cu to account for the Cu content of the sulfides by simple leaching. The PACMANUS hydrothermal field lies in the eastern portion of the eastern Manus Basin. Mass balance modeling of the PACMANUS hydrothermal system indicates that simple leaching of a stationary reaction zone (0.144 km.sup.3) by hydrothermal fluids cannot yield the Cu found in associated sulfide deposits because unacceptably high leaching, transportation and precipitation efficiencies are required to derive the Cu in sulfides by leaching processes. With 100% leaching, transport and precipitating efficiency, 0.166 km.sup.3 of volcanic rocks would need to be leached to account for the Cu budget of hydrothermal sulfide deposits. The key requirement for forming metal-rich magmatic fluids is a large amount of metals available to enter the exsolved vapor phase. Magmas generated in the eastern Manus Basin inherently have high fO.sub.2 because of metasomatism of the mantle source by oxidized materials from the subducted slab, leading to copper enrichment in the magma chamber. Moreover, the presence of Cu in gas-rich melt inclusi on bubbles in Pual Ridge andesite is evidence that degassing and partitioning of Cu into the magmatic volatile phase has occurred in the eastern Manus Basin. Numerical mass balance modeling indicates that approximately 0.236 Mt Cu was potentially transferred to the hydrothermal system per cubic kilometer magma. Magmatic degassing seems to play a more significant role than leaching. Author Affiliation: (1) 0000000119573309, grid.9227.e, Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China (2) Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, 266071, China (3) 0000 0004 1797 8419, grid.410726.6, University of Chinese Academy of Sciences, Beijing, 100049, China (4) Ocean Science Isotope and Geochronology Center, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, 266071, China Article History: Registration Date: 04/09/2019 Received Date: 11/09/2018 Accepted Date: 31/10/2018 Online Date: 05/09/2019 Article note: Foundation item: The National Natural Science Foundation of China under contract Nos 41706052, 41476044 and 41325021 the National Program on Global Change and Air-Sea Interaction under contract No. GASI-GEOGE-02 the National Basic Research Program (973 Program) of China under contract No. 2013CB429700 the International Partnership Program of Chinese Academy of Sciences under contract No. 133137KYSB20170003 the Strategic Priority Research Program of the Chinese Academy of Sciences under contract No. XDA11030302 the Special Fund for the Taishan Scholar Program of Shandong Province under contract No. ts201511061 the National Special Fund for the 13th Five Year Plan of COMRA under contract No. DY135-G2-1-02 the AoShan Talents Program supported by Qingdao National Laboratory for Marine Science and Technology under contract No. 2015ASTP-0S17 the Innovative Talent Promotion Program under contract No. 2012RA2191 the Science and Technology Development Program of Shandong Province under contract No. 2013GRC31502 the Scientific and Technological Innovation Project financially supported by Qingdao National Laboratory for Marine Science and Technology under contract No. 2015ASKJ03 the National High Level Talent Special Support Program, CAS/SAFEA International Partnership Program for Creative Research Teams, and Qingdao Collaborative Innovation Center of Marine Science and Technology. Byline: Yao Ma (1,2), Xiaoyuan Wang (1,2), Shuai Chen (1,2), Xuebo Yin (1), Bowen Zhu (1,3), Kun Guo (1,2,4), Zhigang Zeng (1,2,3)
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titleOrigin of Cu in the PACMANUS hydrothermal field from the eastern Manus back-arc basin: evidence from mass balance modeling.(Report)
descriptionKeywords: back-arc basin; mass balance model; PACMANUS hydrothermal field; source of Cu Abstract: Hydrothermal precipitates associated with active vents in the eastern Manus Basin, an actively opening back-arc basin in the Bismarck Sea, Papua New Guinea, are among the most Cu-rich on the modern seafloor. The volcanic rocks associated with this mineralization may be insufficiently enriched in Cu to account for the Cu content of the sulfides by simple leaching. The PACMANUS hydrothermal field lies in the eastern portion of the eastern Manus Basin. Mass balance modeling of the PACMANUS hydrothermal system indicates that simple leaching of a stationary reaction zone (0.144 km.sup.3) by hydrothermal fluids cannot yield the Cu found in associated sulfide deposits because unacceptably high leaching, transportation and precipitation efficiencies are required to derive the Cu in sulfides by leaching processes. With 100% leaching, transport and precipitating efficiency, 0.166 km.sup.3 of volcanic rocks would need to be leached to account for the Cu budget of hydrothermal sulfide deposits. The key requirement for forming metal-rich magmatic fluids is a large amount of metals available to enter the exsolved vapor phase. Magmas generated in the eastern Manus Basin inherently have high fO.sub.2 because of metasomatism of the mantle source by oxidized materials from the subducted slab, leading to copper enrichment in the magma chamber. Moreover, the presence of Cu in gas-rich melt inclusi on bubbles in Pual Ridge andesite is evidence that degassing and partitioning of Cu into the magmatic volatile phase has occurred in the eastern Manus Basin. Numerical mass balance modeling indicates that approximately 0.236 Mt Cu was potentially transferred to the hydrothermal system per cubic kilometer magma. Magmatic degassing seems to play a more significant role than leaching. Author Affiliation: (1) 0000000119573309, grid.9227.e, Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China (2) Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, 266071, China (3) 0000 0004 1797 8419, grid.410726.6, University of Chinese Academy of Sciences, Beijing, 100049, China (4) Ocean Science Isotope and Geochronology Center, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, 266071, China Article History: Registration Date: 04/09/2019 Received Date: 11/09/2018 Accepted Date: 31/10/2018 Online Date: 05/09/2019 Article note: Foundation item: The National Natural Science Foundation of China under contract Nos 41706052, 41476044 and 41325021 the National Program on Global Change and Air-Sea Interaction under contract No. GASI-GEOGE-02 the National Basic Research Program (973 Program) of China under contract No. 2013CB429700 the International Partnership Program of Chinese Academy of Sciences under contract No. 133137KYSB20170003 the Strategic Priority Research Program of the Chinese Academy of Sciences under contract No. XDA11030302 the Special Fund for the Taishan Scholar Program of Shandong Province under contract No. ts201511061 the National Special Fund for the 13th Five Year Plan of COMRA under contract No. DY135-G2-1-02 the AoShan Talents Program supported by Qingdao National Laboratory for Marine Science and Technology under contract No. 2015ASTP-0S17 the Innovative Talent Promotion Program under contract No. 2012RA2191 the Science and Technology Development Program of Shandong Province under contract No. 2013GRC31502 the Scientific and Technological Innovation Project financially supported by Qingdao National Laboratory for Marine Science and Technology under contract No. 2015ASKJ03 the National High Level Talent Special Support Program, CAS/SAFEA International Partnership Program for Creative Research Teams, and Qingdao Collaborative Innovation Center of Marine Science and Technology. Byline: Yao Ma (1,2), Xiaoyuan Wang (1,2), Shuai Chen (1,2), Xuebo Yin (1), Bowen Zhu (1,3), Kun Guo (1,2,4), Zhigang Zeng (1,2,3)
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abstractKeywords: back-arc basin; mass balance model; PACMANUS hydrothermal field; source of Cu Abstract: Hydrothermal precipitates associated with active vents in the eastern Manus Basin, an actively opening back-arc basin in the Bismarck Sea, Papua New Guinea, are among the most Cu-rich on the modern seafloor. The volcanic rocks associated with this mineralization may be insufficiently enriched in Cu to account for the Cu content of the sulfides by simple leaching. The PACMANUS hydrothermal field lies in the eastern portion of the eastern Manus Basin. Mass balance modeling of the PACMANUS hydrothermal system indicates that simple leaching of a stationary reaction zone (0.144 km.sup.3) by hydrothermal fluids cannot yield the Cu found in associated sulfide deposits because unacceptably high leaching, transportation and precipitation efficiencies are required to derive the Cu in sulfides by leaching processes. With 100% leaching, transport and precipitating efficiency, 0.166 km.sup.3 of volcanic rocks would need to be leached to account for the Cu budget of hydrothermal sulfide deposits. The key requirement for forming metal-rich magmatic fluids is a large amount of metals available to enter the exsolved vapor phase. Magmas generated in the eastern Manus Basin inherently have high fO.sub.2 because of metasomatism of the mantle source by oxidized materials from the subducted slab, leading to copper enrichment in the magma chamber. Moreover, the presence of Cu in gas-rich melt inclusi on bubbles in Pual Ridge andesite is evidence that degassing and partitioning of Cu into the magmatic volatile phase has occurred in the eastern Manus Basin. Numerical mass balance modeling indicates that approximately 0.236 Mt Cu was potentially transferred to the hydrothermal system per cubic kilometer magma. Magmatic degassing seems to play a more significant role than leaching. Author Affiliation: (1) 0000000119573309, grid.9227.e, Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China (2) Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, 266071, China (3) 0000 0004 1797 8419, grid.410726.6, University of Chinese Academy of Sciences, Beijing, 100049, China (4) Ocean Science Isotope and Geochronology Center, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, 266071, China Article History: Registration Date: 04/09/2019 Received Date: 11/09/2018 Accepted Date: 31/10/2018 Online Date: 05/09/2019 Article note: Foundation item: The National Natural Science Foundation of China under contract Nos 41706052, 41476044 and 41325021 the National Program on Global Change and Air-Sea Interaction under contract No. GASI-GEOGE-02 the National Basic Research Program (973 Program) of China under contract No. 2013CB429700 the International Partnership Program of Chinese Academy of Sciences under contract No. 133137KYSB20170003 the Strategic Priority Research Program of the Chinese Academy of Sciences under contract No. XDA11030302 the Special Fund for the Taishan Scholar Program of Shandong Province under contract No. ts201511061 the National Special Fund for the 13th Five Year Plan of COMRA under contract No. DY135-G2-1-02 the AoShan Talents Program supported by Qingdao National Laboratory for Marine Science and Technology under contract No. 2015ASTP-0S17 the Innovative Talent Promotion Program under contract No. 2012RA2191 the Science and Technology Development Program of Shandong Province under contract No. 2013GRC31502 the Scientific and Technological Innovation Project financially supported by Qingdao National Laboratory for Marine Science and Technology under contract No. 2015ASKJ03 the National High Level Talent Special Support Program, CAS/SAFEA International Partnership Program for Creative Research Teams, and Qingdao Collaborative Innovation Center of Marine Science and Technology. Byline: Yao Ma (1,2), Xiaoyuan Wang (1,2), Shuai Chen (1,2), Xuebo Yin (1), Bowen Zhu (1,3), Kun Guo (1,2,4), Zhigang Zeng (1,2,3)
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