The Singu basalts (Myanmar): new constraints for the amount of recent offset on the Sagaing fault

The recent Singu basaltic flows (Mandalay district, Myanmar) are offset by the dextral Sagaing fault. 40K- 40Ar ages of five of the youngest flows forming the southern border of this plateau range from 0.25 to 0.31 My. The right lateral offset of the volcanic field, observed on satellite images, is 6.5 km north and 2.7 km south of the border of the plateau. Considering an initial regular elliptical shape of the plateau, we propose, for the Sagaing fault, a velocity of between 10±1 and 23±3 mn.y-1. This fault would then accommodate, al most, only two thirds of the India-Sundaland relative motion, the remaining part being distributed along other faults in Myanmar. (authors)