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Volume 15 Issue 4
Dec 2004
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Qingsheng Liu, Qingsong Liu, Zeming Zhang, Tao Yang, Yuanyuan Fu. Serpentinized Peridotite as Source of Aeromagnetic Anomalies. Journal of Earth Science, 2004, 15(4): 416-419.
Citation: Qingsheng Liu, Qingsong Liu, Zeming Zhang, Tao Yang, Yuanyuan Fu. Serpentinized Peridotite as Source of Aeromagnetic Anomalies. Journal of Earth Science, 2004, 15(4): 416-419.

Serpentinized Peridotite as Source of Aeromagnetic Anomalies

Funds:

the Major State Basic Research Development Program 2003CB716506

Natural Science Foundation of China University of Geosciences (Wuhan) 

  • Received Date: 20 Dec 2003
  • Accepted Date: 25 Mar 2004
  • The source of long-wavelength aeromagnetic anomalies appears to originate from the earth's deep crust. Constrained by previous studies on geochemical, petrologic analysis, the eclogite and serpentinized peridotite samples from drill hole ZK703 at Donghai in the western Sulu ultrahigh-pressure (UHP) terrane, East China, were unambiguously exhumed from the lower crust and the upper mantle, providing significant information about the magnetic properties of rocks at a deeper part of the crust.Resultsshow that the serpentinization process favors the neoformation of nearly stoichiometric magnetite, resulting in the enhancement of its magnetization up to 8.6 A/m, which is sufficient enough to contribute to some magnetic anomalies. In contrast, eclogite samples have only weaker magnetization (generally less than 0.05 A/m) compared to serpentinized peridotite. Nevertheless, experiments under the lower crustal conditions are necessary to further support these conclusions.

     

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