Crustal large-scale serpentinized mantle peridotite body in the Sulu ultrahigh-pressure metamorphic belt,eastern China: Evidence from gravity and magnetic anomalies |
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| Affiliation: | 1. Department of Geophysics, China University of Geosciences, Wuhan 430074, China;2. Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, CAS, Guangzhou 510301, China;3. Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China;4. Institute of Geomechanics, CAGS, Beijing 100081, China;1. University of Montpellier, Institut Montpelliérain Alexander Grothendieck, 34095 Montpellier, France;2. University of Udine, Polytechnic Department of Engineering and Architecture, 33100 Udine, Italy;1. Facultad de Ingenieria, Universidad Autonoma de Chile, Llano Subercaceaux 2801, San Miguel, Santiago, Chile;2. Universidad Bernardo O Higgins, Departamento de Ciencias Químicas y Biológicas, General Gana 1702, Santiago, Chile;1. Department for Geodynamics and Sedimentology, University of Vienna, Austria;2. Computational Geology Laboratory, Polish Geological Institute – National Research Institute, Wroc?aw, Poland;3. Physics of Geological Processes, University of Oslo, Norway |
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| Abstract: | From analysis of the geological and geophysical data (gravity, magnetic, seismic and petrophysics), we propose that geophysical anomalies are produced by a serpentinized mantle peridotite body (SMPB) situated in the middle to lower crust in the Sulu Belt. The SMPB was formed by crustal emplacement of mantle peridotites accompanied by ultrahigh-pressure (UHP) metamorphism. Our finding suggests an emplacement mechanism for the serpentinized mantle wedge (SMW), early in the subduction process. This is different from the classic view, which holds that the serpentinized forearc mantle is formed by in situ hydration processes (Blakely et al., 2005). The petrophysical properties of the SMPB are similar to those of the serpentinized forearc mantle or SMW in modern subduction-zones worldwide, but the formation mechanisms for SMPB and SMW are different. This observation is important for understanding the geodynamic processes that operated in the large UHP metamorphic belt in the Dabie-Sulu area, eastern China. |
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| Keywords: | Serpentinized mantle peridotite body Gravity and magnetic anomalies Deep geodynamics Sulu UHP metamorphic belt Eastern China |
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