Oligo-Miocene midcrustal subhorizontal shear zone in Indochina

New structural observations of Oligo-Miocene deformation in north Vietnam a long the Red River Shear Zone suggest that left-lateral strike-slip shear w as restricted to the upper and middle crust above a horizontal shear zone. Left-lateral shear deformation is associated with low-pressure-low-temperat ure parageneses. High-temperature deformation is restricted to zones where the foliation has a low dip in the core of the Dai Nui Con Voi antiformal d ome. These observations complete those made earlier in the Bu Khang extensi onal dome farther south. Above the horizontal shear zone left-lateral trans pression was active during the first stage and changed to transtension some 33 Myr ago. Purely extensional metamorphic domes (Bu Khang) or transtensio nal domes (Dai Nui Con Voi) were exhumed during this younger stage. Our obs ervations plead for caution when interpreting strike-slip structures at lit hospheric scale.