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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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  • Ernst, W.G., Liou, J.G., 1999. Overview of UHP Metamorphism and Tectonics in Well-Studied Collisional Orogens. Int. Geol. Rev., 41: 477-493 doi: 10.1080/00206819909465153
    Frost, B.R., Shive, P.N., 1986. Magnetic Mineralogy of the Lower Continental Crust. J. Geophys. Res., 91: 6513- 6521 doi: 10.1029/JB091iB06p06513
    Hall, D.H., 1974. Long-Wavelength Aeromagnetic Manitoba and Northwestern Ontario, Canada. J. Geophys., 40: 403 -430
    Liou, J.G., Carswell, D.A., 2000. Garnet Peridotites and Ultrahigh-Pressure Minerals. J. Metamorph. Geol., 18: 181 -192 doi: 10.1046/j.1525-1314.2000.00237.x
    Liu, Q.S., Gao, S., 1992. Geophysical Properties of the Lower Crustal Granulites from the Qinling Orogenic Belt, China. Tectonophysics, 204: 401-408 doi: 10.1016/0040-1951(92)90318-Z
    Liu, Q.S., Gao, S., Liu, Y.S., 2000. Magnetic Structure of the Continental Crustal Cross-Section in Central North China Craton. J. Geodynamics, 29: 1-13 doi: 10.1016/S0264-3707(99)00064-2
    Liu, Q.S., Gao, S., Xu, Q.D., 1996. Magnetic Petrology of Archean Amphibolite-Granulite Facies Rocks from Yangtze Craton, South China. EOS, 77: 81
    Peacock, S.M., 1993. Large-Scale Hydration of the Lithosphere above Subducting Slabs. Chem. Geol., 108: 49-59 doi: 10.1016/0009-2541(93)90317-C
    Pechersky, D.M., Genshaft, Y.S., 2002. Petromagnetism of the Continental Crust: A Summary of 20th Century Research. Physics Solid Earth, 38: 2-32
    Pilchin, A., Eppelbaum, L., 1997. Determination of the Lower Edges of Magnetized Bodies by Using Geothermal Data. Geophys. J. Int., 128: 167-174 doi: 10.1111/j.1365-246X.1997.tb04077.x
    Pilchin, A.N., Khesin, B.E., 1981. The Possible Nature of the Lower Boundaries of Magnetically Active Bodies. Razvedochnaya Geofizika, 92: 145-150
    Pucher, R., Wonik, T., 1998. A New Interpretation of the MAGSAT Anomalies of Central Europe. Phys. Chem. Earth, 23: 9-10
    Schnetzler, C.C., Allenby, R.J., 1983. Estimation of Lower Crust Magnetization from Satellite Derived Anomaly Field. Tectonophysics, 92: 33-45
    Sheman, D. M., 1989. The Nature of the Pressure Induced Metallization of FeO and Its Implications to the Core-Mantle Boundary. Geophys. Res. Lett., 16: 515-518 doi: 10.1029/GL016i006p00515
    Shive, P.N., Fountain, D.M., 1988. Magnetic Mineralogy in an Archaen Crustal Cross Section: Implications for Crustal Magnetization. J. Geophys. Res., 93: 12177-12186 doi: 10.1029/JB093iB10p12177
    Wasilewski, P.J., Mayhew, M.A., 1992. The Moho as a Magnetic Boundary Revisited. Geophys. Res. Lett., 19: 2259-2262 doi: 10.1029/92GL01997
    Williams, M.C., Shive, P.N., Fountain, D.M., et al., 1985. Magnetic Properties of Exposed Deep Crustal Rocks from the Superior Province of Manitoba. Earth Planet. Sci. Lett., 76: 176-184 doi: 10.1016/0012-821X(85)90157-8
    Zheng, Y.F., Fu, B., Li, Y.L., et al., 1998. Oxygen and Hydrogen Isotope Geochemistry of Ultrahigh-Pressure Eclogites from the Dabie Mountains and Sulu Terrane. Earth Planet. Sci. Lett., 155: 113-129 doi: 10.1016/S0012-821X(97)00203-3
    Zhang, Z.M., Xu, Z.Q., Xu, H.F., 2000. Petrology of Ultrahigh-Pressure Eclogites from the ZK703 Drillhole in the Donghai, Eastern China. Lithos, 52: 35-50 doi: 10.1016/S0024-4937(99)00083-3
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