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Magnetic fabrics and tectonic implications of Cambrian in the northern South China
QingShan LI, Jie ZHAO, YouXin CHEN, ChengJun LIU, Lei PEI, ZuoChen LI, XianZhi PEI, Mao WANG, Shang JI
Prog Geophy ›› 2025, Vol. 40 ›› Issue (5) : 1919-1933.
PDF(12126 KB)
PDF(12126 KB)
Magnetic fabrics and tectonic implications of Cambrian in the northern South China
The spatial and temporal distribution of the palaeomagnetic data of the South China Block is uneven, which limits our understanding of the paleogeography position of the South China Block in the Early Paleozoic. To search for suitable strata for systematic study of paleomagnetism, this study carries out a combined study including petrography, rock magnetism, and magnetic fabric on the mudstone-siltstone of the Cambrian strata from the Zhenba area in the northwestern edge of the South China. The results show that the magnetic minerals of the strata are mainly composed of titanium-bearing hematite or magnetite and magnetic pyrite, while the magnetic fabric is characterized by depositional-weakly deformed magnetic fabric. It is concluded that most of the Cambrian strata in this area have not been tensely modified by tectonic activities, and it is expected to retain the primary magnetic component acquired during deposits, which makes it possible to obtain reliable paleomagnetic data.
The northern margin of the South China Block / Cambrian / Magnetic fabrics / Rock magnetism / Paleocurrent / Tectonic deformation
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