Table A1.

Detrital zircon ages for Mesozoic and Palaeozoic sediments on the Shan Plateau and Shan Scarps areas (Fig. A1)

Lithology (sample number) (number of mineral grains analysed)LocationDating methodAge ± error (Ma)ReferencesNotes
Upper Triassic–Lower JurassicFine-grained sandstones (2012M74) (zircons n = 152), (2012M75) (zircons n = 78)20° 49.028′ N, 96° 25′ 6.315′ ELA-ICP-MS 206Pb/238U < 1000 Ma214.7 ± 5.9 (maximum deposition age)Cai et al. (2017)Major age populations: 350–200, 200–1700, 500–400 Ma
Loi-an Group near Kalaw(2012M84) (zircons n = 155) Total of 452 acceptable ages20° 39.057′ N, 96° 35.602′ E207Pb/206Pb > 1000 MaMinor age population: 1250–700 Ma; max deposition age of 215 ± 6 Ma gives robust constraint on time of collision of Sibumasu with the Indochina Block
PermianArgillite from near Mawchi Mine (zircon xenocryst)207Pb corrected 206Pb/238U292 (youngest age)Aung Zaw Myint et al. (2017)Youngest zircon age indicates that the Mawchi Group argillite was deposited in the Sakmarian (Permian)
Mawchi GroupArgillite from near Mawchi Mine (zircon xenocrysts)207Pb corrected 206Pb/238UAung Zaw Myint et al. (2017)Other zircon xenocrysts: 292, 321, 350, 449, 468 and 1165 Ma
CarboniferousFine-grained sandstones (2012M87) (zircons n = 127)20° 45′ 07″ N, 96° 17′ 59.8″ ELA-ICP-MS 206Pb/238U < 1000 Ma469.5 ± 3.7 (maximum deposition age)Cai et al. (2017)Major age populations: 571–417, 1000–800, 1261–1023 Ma
Mergui Group west of Kalaw(2012M88) (zircons n = 183) Total of 310 usable ages20° 45′.173′ N, 96° 17.649′ E207Pb/206Pb > 1000 MaMinor age population: 3625–1500 Ma
Upper SilurianMedium-grained sandstones (2012M80) (zircons n = 179) Total of 279 acceptable ages20° 43′ 20.5″ N, 97° 14′ 25.3″ ELA-ICP-MS 206Pb/238U < 1000 Ma464.8 ± 3.7 (maximum deposition age)Cai et al. (2017)Major age populations: 567–470 and 982–887 Ma
Namshim Formation(2012M81) (zircons n = 100)Near Taunggyi207Pb/206Pb > 1000 MaMinor age population: 2463–2405 Ma; additional ages scattered between 2399–1001 and 3620–2601 Ma
Late OrdovicianSiltstone (2012M79) (zircons n = 169) Total of 141 acceptable ages.20° 44.195′ N, 96° 51.428′ ELA-ICP-MS 206Pb/238U < 1000 Ma495.4 ± 3.7 (maximum deposition age)Cai et al. (2017)Major age peak at 936 Ma
Nan-on Formation, Pindaya GroupNear Kalaw207Pb/206Pb > 1000 MaSubordinate age populations at 548, 1168 and 1705 Ma