TY - JOUR
T1 - Crustal large-scale serpentinized mantle peridotite body in the Sulu ultrahigh-pressure metamorphic belt, eastern China
T2 - Evidence from gravity and magnetic anomalies
AU - Liu, Qingsheng
AU - Qiu, Ning
AU - Zheng, Jianping
AU - Li, Zhiyong
AU - Wang, Hongcai
PY - 2015/1/1
Y1 - 2015/1/1
N2 - 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 etal., 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.
AB - 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 etal., 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.
KW - Deep geodynamics
KW - Eastern China
KW - Gravity and magnetic anomalies
KW - Serpentinized mantle peridotite body
KW - Sulu UHP metamorphic belt
UR - http://www.scopus.com/inward/record.url?scp=84920159633&partnerID=8YFLogxK
U2 - 10.1016/j.jsg.2014.11.009
DO - 10.1016/j.jsg.2014.11.009
M3 - Article
AN - SCOPUS:84920159633
SN - 0191-8141
VL - 70
SP - 190
EP - 199
JO - Journal of Structural Geology
JF - Journal of Structural Geology
ER -