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Genesis of the South Pit Deposit in Jiama District, Tibet: Constraints from Geology, Geochronology and Amphibole Geochemistry.

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Title: Genesis of the South Pit Deposit in Jiama District, Tibet: Constraints from Geology, Geochronology and Amphibole Geochemistry.
Authors: Tang, Pan1,2,3 (AUTHOR), Tang, Juxing4 (AUTHOR), Lin, Bin5 (AUTHOR), Zhou, Aorigele4 (AUTHOR) zhouaorigele@163.com, Li, Faqiao5 (AUTHOR), Fang, Xiang4 (AUTHOR), Qi, Jing6 (AUTHOR), Wang, Mengdie5 (AUTHOR), Xiong, Yan5 (AUTHOR), Xie, Yuke1,2 (AUTHOR), Yang, Zhengkun3 (AUTHOR), Yao, Xiaofeng7 (AUTHOR)
Source: Journal of Earth Science. Aug2025, Vol. 36 Issue 4, p1479-1492. 14p.
Subject Terms: *Geology, *Geochemistry, *Ore deposits, *Metasomatism, *Geological time scales, *Physiographic provinces
Geographic Terms: Tibet (China)
Abstract: The giant Jiama deposit is a post-collisional porphyry Cu-polymetallic system located in the Gangdese metallogenic belt of Tibet. It consists of three deposits: The Main deposit, the Zegulangbei deposit, and the South Pit deposit according to exploration and research. The South Pit deposit is a high-grade Cu-Pb-Zn deposit, but its genesis is unclear. To investigate its genesis, a detailed study was conducted on the deposit geology, geochronology and amphibole geochemistry. The results indicate that the weighted average 206Pb/238U age of the zircons from the granite porphyry in the South Pit is 15.38 ± 0.45 Ma, and the molybdenite from the mineralized skarn yield a Re-Os isochron age of 15.23 ± 0.22 Ma, in line with the age of the Main deposit (15.7−14.3 Ma). The amphiboles in the granite porphyry of the South Pit, magnesiohornblende and actinolite, are high in Mg and Ca and low in K. They crystallized at temperatures of 705–749 °C, pressures of 0.44–0.67 kbar, oxygen fugacity of −14.31− −13.69 (NNO), and depths of 1.7–2.5 km. Mapping of structure and alteration indicates that the South Pit skarn developed due to the metasomatism of marble of hornfels or carbonate in fold hinge dilation and an interlayer detachment zone by magmatic hydrothermal fluids. According to the age of magmatism and geological features, the South Pit deposit and the Main deposit have originated from the same Miocene magmatism, but the South Pit deposit was affected by the gliding nappe tectonic system. The amphibole geochemistry indicates that the ore-related magma of the South Pit has a high oxygen fugacity and is rich in water. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 187308894
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Genesis of the South Pit Deposit in Jiama District, Tibet: Constraints from Geology, Geochronology and Amphibole Geochemistry.
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  Data: <searchLink fieldCode="AR" term="%22Tang%2C+Pan%22">Tang, Pan</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tang%2C+Juxing%22">Tang, Juxing</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lin%2C+Bin%22">Lin, Bin</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhou%2C+Aorigele%22">Zhou, Aorigele</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> zhouaorigele@163.com</i><br /><searchLink fieldCode="AR" term="%22Li%2C+Faqiao%22">Li, Faqiao</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fang%2C+Xiang%22">Fang, Xiang</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Qi%2C+Jing%22">Qi, Jing</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Mengdie%22">Wang, Mengdie</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xiong%2C+Yan%22">Xiong, Yan</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xie%2C+Yuke%22">Xie, Yuke</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yang%2C+Zhengkun%22">Yang, Zhengkun</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yao%2C+Xiaofeng%22">Yao, Xiaofeng</searchLink><relatesTo>7</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Earth+Science%22">Journal of Earth Science</searchLink>. Aug2025, Vol. 36 Issue 4, p1479-1492. 14p.
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  Data: *<searchLink fieldCode="DE" term="%22Geology%22">Geology</searchLink><br />*<searchLink fieldCode="DE" term="%22Geochemistry%22">Geochemistry</searchLink><br />*<searchLink fieldCode="DE" term="%22Ore+deposits%22">Ore deposits</searchLink><br />*<searchLink fieldCode="DE" term="%22Metasomatism%22">Metasomatism</searchLink><br />*<searchLink fieldCode="DE" term="%22Geological+time+scales%22">Geological time scales</searchLink><br />*<searchLink fieldCode="DE" term="%22Physiographic+provinces%22">Physiographic provinces</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Tibet+%28China%29%22">Tibet (China)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The giant Jiama deposit is a post-collisional porphyry Cu-polymetallic system located in the Gangdese metallogenic belt of Tibet. It consists of three deposits: The Main deposit, the Zegulangbei deposit, and the South Pit deposit according to exploration and research. The South Pit deposit is a high-grade Cu-Pb-Zn deposit, but its genesis is unclear. To investigate its genesis, a detailed study was conducted on the deposit geology, geochronology and amphibole geochemistry. The results indicate that the weighted average 206Pb/238U age of the zircons from the granite porphyry in the South Pit is 15.38 ± 0.45 Ma, and the molybdenite from the mineralized skarn yield a Re-Os isochron age of 15.23 ± 0.22 Ma, in line with the age of the Main deposit (15.7−14.3 Ma). The amphiboles in the granite porphyry of the South Pit, magnesiohornblende and actinolite, are high in Mg and Ca and low in K. They crystallized at temperatures of 705–749 °C, pressures of 0.44–0.67 kbar, oxygen fugacity of −14.31− −13.69 (NNO), and depths of 1.7–2.5 km. Mapping of structure and alteration indicates that the South Pit skarn developed due to the metasomatism of marble of hornfels or carbonate in fold hinge dilation and an interlayer detachment zone by magmatic hydrothermal fluids. According to the age of magmatism and geological features, the South Pit deposit and the Main deposit have originated from the same Miocene magmatism, but the South Pit deposit was affected by the gliding nappe tectonic system. The amphibole geochemistry indicates that the ore-related magma of the South Pit has a high oxygen fugacity and is rich in water. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1007/s12583-023-1855-x
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 14
        StartPage: 1479
    Subjects:
      – SubjectFull: Geology
        Type: general
      – SubjectFull: Geochemistry
        Type: general
      – SubjectFull: Ore deposits
        Type: general
      – SubjectFull: Metasomatism
        Type: general
      – SubjectFull: Geological time scales
        Type: general
      – SubjectFull: Physiographic provinces
        Type: general
      – SubjectFull: Tibet (China)
        Type: general
    Titles:
      – TitleFull: Genesis of the South Pit Deposit in Jiama District, Tibet: Constraints from Geology, Geochronology and Amphibole Geochemistry.
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            – D: 01
              M: 08
              Text: Aug2025
              Type: published
              Y: 2025
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