Anisotropy of magnetic susceptibility of Hannuoba basalt, northern China: Constraints on the vent position of the lava sequences

摘要: [1] Anisotropy of magnetic susceptibility (AMS) was determined for Hannuoba basaltic samples from 17 flows (21.4 ± 0.7Ma) distributed in three sections (Jianshaba, Yuershan and Manjing) around Zhangbei, northern China. The results show normal ‘flow’ fabrics with horizontal foliation planes. typical ratios the principal AMS axes are 1.01 lineation (L) 1.02 (F), respectively. Magnetic hysteresis loop, isothermal remanence, thermomagnetic properties, optical observations indicate that pseudo-single domain (PSD) low-titanium magnetite particles dominate low-field samples. Thus magma at this area is believed to be originated low-Titanium driven by lava flow. Since Kmax trends coincide well observed flow directions, intersection mean these sites perfectly defines previously known vent position sequences.