40Ar/39Ar dating result of Neogene basalts in Vietnam and its tectonic implication

Quaternary sediments in the Dien Bien Phu fault zone, NW Vietnam: a record of young tectonic processes in the light of OSL-SAR dating results

“…Pécskay, pers. comm., 2003) and in Dien Bien by the earliest Pliocene (5.4 -5.2 Ma;Hoang et al, 1996;Lee et al, 1998;to 5.2 Ma;cf. Pécskay et al, 2002) tholeiitic basalts, as well as by the occurrence of thermal springs, and increased emanations of radon, methane and carbon dioxide (Hung and Vinh, 2001).…”

Crustal contamination of Late Neogene basalts in the Dien Bien Phu Basin, NW Vietnam: Some insights from petrological and geochronological studies

“…3 and 4). Immediately north of the basin, the fault zone is accompanied by exposures of Upper Neogene tholeiitic basalts (Hoang et al, 1996a,b;Lee et al, 1998), thermal springs, and emanations of radon, methane and carbon dioxide (Hung and Vinh, 2001), and is marked by epicentres of relatively strong earthquakes. Young basalts have been drilled in the basin bottom, some 2 km west of Dien Bien city (borehole LK-3D; cf.…”

“…4 and 5) underlie a nearly 130 m-thick sequence of fluvio-lacustrine-paludal sediments. These were dated using the 40 Ar/ 39 Ar method (sample DBP-1) as 5.4±0.1 Ma by Lee et al (1998), as compared to a 40 K/ 40 Ar age of 5.20±0.34 Ma (sample LK-3D, lab. no.…”

Geochronological and geochemical constraint on the Cenozoic extension of Cathaysian lithosphere and tectonic evolution of the border sea basins in East Asia

“…1 and 6). The basalt eruptions that occurred in Vietnam, Taiwan, the Okinawa trough and the Izu-Bonin arc also have this age range (Zhu et al, 1988;Wang et al, 1989;Zhu and Wang, 1989;Lan et al, 1996;Zhu et al, 1997;Lee et al, 1998;Ishizuka et al, 2000). A few age data of about 25 Ma in the northern Fujian are for small volcanic necks composed of ultramafic rocks with glass.…”