Table A11.

Detrital zircon ages and isotope data for Neogene and Palaeogene sediments in the Central Valley (Fig. A3)

Lithology (sample number) (number of mineral grains analysed)LocationDating methodAge ± error (Ma)MSWDTotal age87Sr/86SrϵNd (T)Zircon ϵHfReferencesNotes
Miocene–PlioceneFeldspatho-litho-quartzose with metamorphic > sedimentary > volcanic lithics.Nd isotopic analysisc. −13 to −6Licht et al. (2014)
Pegu Group and Irrawaddy FormationBulk rock ϵNd
Upper MioceneWestern Central Basin
Uppermost Pegu GroupSandstone (BUR04) (zircons n = 62)c. 60 km west of Mandalay cityLA-MC-ICP-MS24–3151Liang et al. (2008)47/52 zircons have Cretaceous–Palaeogene ages; 24 zircons have ϵHf values >+16 similar to the Gangdese batholith in Tibet. Up to Late Miocene the Yarlung Tsangpo river drained into the Ayeyarwady River.
Middle MioceneWestern Central Basin
Obogon FormationSandstone (Obogon)LA-MC-ICP-MS31.1 ± 0.7c. −2.2Robinson et al. (2014)Youngest zircon in Obogon Formation
Eastern Central Myanmar Basin
Lower Moza FormationSandstone (Lower Moza) (zircons n = 28)21° 39′ 20.38″ N, 95° 46′ 20.10″ ELA-MC-ICP-MS32.9 ± 0.7Robinson et al. (2014)Minimum age of Moza Formation
Early Miocene
Taungtalon FormationSandstone (Taungtalon-1) (zircons n = 44)21° 38′ 25.69″ N, 95° 48′ 11.12″ ELA-MC-ICP-MS29.7 ± 0.6c. −7.9 and +2.4Robinson et al. (2014)Minimum age of Taungtalon Formation
Shwetaung FormationSandstone (Schwetaung-1) (zircons n = 52)21° 39′ 58.79″ N, 95° 45′ 54.34″ ELA-MC-ICP-MS18.2 ± 0.3c. +9.4Robinson et al. (2014)Minimum age of Schwetaung Formation
OligoceneWestern Central Myanmar Basin
Padaung FormationSandstone (Padaung-2) (zircons n = 78)22° 6′ 40″ N, 94° 58′ 38.70″ ELA-MC-ICP-MS27.6 ± 1.4Robinson et al. (2014)Minimum age of Padaung Formation
Padaung FormationSandstone (Padaung-3) (zircons n = 63)22° 5′ 56.60″ N, 94° 59′ 45.90″ ELA-MC-ICP-MS33.8 ± 0.7Robinson et al. (2014)
Upper Eocene–OligoceneMinbu sub-basin
Yaw, Shwezetaw, Padaung, Okhintaung formationsFeldspatho-quartzo-lithic with sedimentary > volcanic and metamorphic lithicsNd isotopic analysis; bulk rock ϵNdc. −9 to −2Licht et al. (2014)
Taungup–Prome roadEocene flysch (M3), (M5 & M11) Cretaceous metamorphics. Locality M1118° 38.37′ N, 94° 54′ EApatite fission (AFT age)19 9, 6.5–2Zhang et al. (2015)Time–temperature models of AFT data suggest four major Cenozoic cooling epoisodes: Late Oligocene; Early–Middle Miocene; Late Miocene; and Pliocene–Pleistocene
Western thrust belt of Minbu Sub-basin (M20 & M21); locality M21 (Miocene)18° 46.05′ N, 95° 11.25′ EApatite fission (AFT age)28–13.5, 7.5–3.5Zhang et al. (2015)
Eocene molasse (M20)18° 38.07′ N, 94° 58.5′ EApatite fission (measured age)25.5 ± 1.5
Late EoceneEastern Central Myanmar Basin
Upper Pondaung FormationSandstone (Pondaung-2) (zircons n = 39)22° 59′ 25.73″ N, 95° 53′ 10.57″ ELA-MC-ICP-MS34.4 ± 0.9Robinson et al. (2014)
Middle Pondaung FormationSandstone (Pondaung-1) (zircons n = 61)22° 59′ 19.64″ N, 95° 52′ 52.32″ ELA-MC-ICP-MS41.4 ± 0.9c. +8.6Robinson et al. (2014)Maximum age of Pondaung Formation
Robinson et al. (2014) conclude that Yarlung Tsangpo–Ayeyarwady river system was established at least by the Middle–Late Eocene but became disconnected in the Early Miocene due to deformation in the Eastern Syntaxis. Tang et al. (2012) conclude Ayeyarwaddy river may have developed independently
Late Middle Eocene NE Minbu Sub-basin
Pondaung Formation, Upper MemberTuffaceous bedMagneto-stratigraphic age37.4Benammi et al. (2002)
Upper EoceneMinbu Sub-basin
Yaw FormationCoarse-grained samples and mudstones; Bahin township n = 221° 43′ N, 94° 40′ENd and Sr isotopic bulk analysis0.708–0.714c. −8 to −3Licht et al. (2013)Family 3
Seikche North & South n = 421° 42′ N, 94° 42′ E
Late Middle Eocene
Pondaung FormationCoarse-grained samples and mudstones n = 521° 44′ N, 94° 37′ ENd and Sr isotopic bulk analysis0.705–0.713c. −4 to +0.5Licht et al. (2013)Family 1
Upper MemberCoarse-grained samples and mudstones n = 621° 45′ N, 94° 50′ ENd and Sr isotopic bulk analysis0.714–0.718c. −8 to −4Licht et al. (2013)Family 2
Pondaung FormationAyoedawpon Taung Claystone (Pk5 tuff site, upper tuff band)21° 45′ N, 94° 39′ EZircon fission track38.8 ± 1.4Tsubamoto et al. (2009)Upper tuff is just over 1 m above the lower tuff band
Upper MemberAyoedawpon Taung Claystone Pk1 tuff site, lower tuff band)Zircon fission track37.2 ± 1.3Tsubamoto et al. (2002)Lower tuff band is 1 m above and 50 m distant from the primate postcrania-bearing horizon
Pk4 locality in Ayoedawpon Taung Claystone (n = 16 zircons)21° 45′ N, 94° 39′ ELA-MC-ICP-MS40.31 ± 0.651.6Khin Zaw et al. (2014a)Richest deposit of terrestrial mammals in SE Asia
Pk8 locality in Ayoedawpon Taung Claystone (n = 12 zircons)21° 45′ N, 94° 39′ ELA-MC-ICP-MS40.22 ± 0.861.8Khin Zaw et al. (2014a)Oldest U–Pb dated anthropoid primates
Middle Eocene
Tabyin and Pondaung formationsFeldspatho-quartzo lithic with volcanic>sedimentary and metamorphic lithicsNd isotopic analysisc. −7 to + 1Licht et al. (2013)
NW Chindwin basin section east of the Kabaw fault and west of Kalewa
L. Miocene Pegu groupSandstones and mudstones (25-4-2) (zircons n = 100)23° 11′ 39.1″ N, 94° 17′ 27.2″ EQ-ICP-MS16.8 (min age)c. −21.4 to +16.4Wang et al. (2014)Recycled orogen derivation
Sandstones and mudstones (25-3-1) (zircons n = 100)22° 31′ 59.9″ N, 94° 34′ 17.4″ EQ-ICP-MS28.5 (min age)c. −34.8 to +14.7Wang et al. (2014)Detrital zircon ages: 28–132, 188–197, 521–596, 893–901, 970, 1260, 1896, 1943 Ma
Pondaung FormationSandstones (25-8-1) (zircons n = 100)23° 11′ 58.8″ N, 94° 13′ 51.7″ EQ-ICP-MS42 (min age)c. +1.4 to +16.6Wang et al. (2014)Magmatic arc and recycled orogen derivations
Sandstones (26-7-1) (zircons n = 100)23° 12′ 07.5″ N, 94° 13′ 21.6″ EQ-ICP-MS47 (min age)c. −19.6 to +16Wang et al. (2014)Detrital zircon ages: 47–215, 340–349, 503–684, 977–991, 1124–1187, 1337, 1756. 2073, 3338, 3446 Ma
Tilin FormationSandstones and mudstones (26-5-3) (zircons n = 100)23° 12′ 20.6″ N, 94° 12′ 23.3″ EQ-ICP-MS47 (min age)c. −18.6 to +14.2Wang et al. (2014)Recycled orogen derivation; detrital zircon ages: 47–125, 200–249, 510–599, 636–697, 781–813, 1134–1190, 1234–1266, 1598–1520 Ma
Paleocene
Paunggyi FormationSandstones & conglomerates (26-3-8) (zircons n = 100)23° 13′ 39.4″ N, 94° 9′ 20.9″ EQ-ICP-MS69 (n = 2)c. +0.1 to +14.9Wang et al. (2014)Recycled orogen derivation; detrital zircon ages: 69–114, 135, 230, 351, 1065, 1182 Ma
Sandstones and conglomerates (26-3-1) (zircons n = 100)23° 13′ 25.7″ N, 94° 9′ 07.6″ EQ-ICP-MS54 (min age)c. −3.7 to +15.5Wang et al. (2014)
Upper Cretaceous Kabaw FormationSandstones and minor shales (26-1-5) (zircons n = 100)23° 13′ 39.3″ N, 94° 7′ 25.5″ EQ-ICP-MS75 (n = 3)c. +3.2 to +12.3Wang et al. (2014)Magmatic arc and recycled orogen derivations; detrital zircon ages: 75–105, 213, 570, 674 Ma
Wang et al. (2014) concluded that the West Myanmar Arc had a main magmatic stage at 110–80 Ma and a subordinate magmatic stage at c. 70–40 Ma, the magma being derived from a juvenile source which was simailar to the Gangdese arc in Tibet
Early Middle Eocene
Southern Chindwin basinc. 22° 08′ N, 94° 46′ E
Lower Member of Pondaung FormationVolcaniclastic sandstone (PD-21/6) (zircons n = 12)LA-ICP-MS43.3 ± 4.4 (min age)Kyaw Linn Oo et al. (2015)
2000 m of fluvial sedimentsVolcaniclastic sandstone (PD-21/6) (zircons n = 6)LA-ICP-MS99.51 ± 1.1 (intercept age)0.9Kyaw Linn Oo et al. (2015)Major detrital peak; 207Pb corr. 100.4, 101.1, 103.8. 105.2, 203.7 Ma
Volcaniclastic sandstone (PD-24/2) (zircons n = 12)LA-ICP-MS46.9 ± 2.4 (min age)Kyaw Linn Oo et al. (2015)
Volcaniclastic sandstone (PD 24/2) (zircons n = 5)LA-ICP-MS88.6 ± 1.6 (intercept age)0.2Kyaw Linn Oo et al. (2015)Major detrital peak; 207Pb corr. 99.8, 107.0, 117.5, 842.6 Ma
Volcaniclastic sandstone (PD-1/5) (zircons n = 12)LA-ICP-MS47.2 ± ? (min age)Kyaw Linn Oo et al. (2015)
Volcaniclastic sandstone (PD-1/5) (zircons n = 6)LA-ICP-MS100.0 ± 1.2 (intercept age)0.85Kyaw Linn Oo et al. (2015)Major detrital peak; 207Pb corr. 503 Ma
Volcaniclastic sandstone (PD-28/3) (zircons n = 12)LA-ICP-MS51.6 ± 2.0 (min age)Kyaw Linn Oo et al. (2015)
Volcaniclastic sandstone (PD- 28/3) (zircons n = 7)LA-ICP-MS101.7 ± 1.1 (intercept age)0.71Kyaw Linn Oo et al. (2015)Major detrital peak; 207Pb corr. 173.4, 628.1 Ma
Volcaniclastic sandstone (PD-28/9) (zircons n = 12)LA-ICP-MS65.1 ± 1,6 (min age)Kyaw Linn Oo et al. (2015)
Volcaniclastic sandstone (PD-28//9) (zircons n = 3)LA-ICP-MS80.4 ± 1.8 (intercept age)0.99Kyaw Linn Oo et al. (2015)Major detrital peak; 207Pb corr. 132.1, 218.4, 435.0, 487.3, 1052.2 Ma.
Volcaniclastic sandstones (all samples) (zircons n = 6)LA-ICP-MS47.75 ± 0.87 (intercept age)1.5Kyaw Linn Oo et al. (2015)Major detrital peak
Middle Miocene
Rakhine Coastal Belt, Yenandaung FromationLight-grey turbiditic sandstone (10TTN09) (zircons n = 108)17° 59′ 37″ N, 94° 29′ 44″ ELA-ICP-MS, U–Pb32.8 ± 0.62 (youngest age)Tin Tin Naing et al. (2013)8 zircons >1200 Ma
Lower Miocene
Leikkammaw FormationSoft sandstone (10TTN18) (zircons n = 52)19° 20′ 27″ N, 93° 29′ 34″ ELA-ICP-MS, U–Pb49.5 ± 1.44 (youngest age)c. −4.02 to +14.5Tin Tin Naing et al. (2013)2 zircons >1200 Ma
Oligocene
Yechangyi FormationMedium-grained turbiditic sandstone (10TTN16) (zircons n = 162)19° 52′ 55″ N, 93° 12′ 05″ ELA-ICP-MS, U–Pb28 ± 0.44 (youngest age)Tin Tin Naing et al. (2013)30 zircons >1200 Ma
Yechangyi FormationMedium-grained, yellow-brown turbiditic sandstone (10TTN13) (zircons n = 56)18° 0′ 11″ N 94° 26′ 14″ ELA-ICP-MS, U–Pb28.1 ± 0.43 (youngest age)c. −1.28 to +11.82Tin Tin Naing et al. (2013)4 zircons >1200 Ma.
Yechangyi FormationFine- to medium-grained turbiditic sandstone (10TTN20) (zircons n = 51)18° 54′ 01″ N, 93° 57′ 16″ ELAICP-MS, U–Pb36.2 ± 0.7 (youngest age)Tin Tin Naing et al. (2013)5 zircons >1200 Ma.
Yechangyi FormationMedium-grained, reddish-brown turbiditic sandstone (10TTN10) (zircons n = 106)18° 8′ 20″ N, 94° 26′ 37″ ELA-ICP-MS, U–Pb43.3 ± 1.24 (youngest age)c. −0.37 to +14.4Tin Tin Naing et al. (2013)
Middle Eocene
Ngapali FormationMedium-grained dark-grey turbiditic sandstone (10TTN04) (zircons n = 92)18° 22′ 11″ N, 94° 23′ 01″ ELA-ICP-MS, U–Pb39.2 ± 1.06 (youngest age)c. +3.4 to +14.0Tin Tin Naing et al. (2013)1 zircon >1200 Ma
Ngapali FormationVery coarse brownish-grey to grey turbiditic sandstone (10TTN06) (zircons n = 149)18° 18′ 31″ N, 94° 19′ 38″ ELA-ICP-MS, U–Pb46 ± 0.63 (youngest age)c. −2.05 to +14.8Tin Tin Naing et al. (2013)3 zircons >1200 Ma.
Ngapali FormationMedium-grained, dark-grey turbiditic sandstone (10TTN03) (zircons n = 54)180 29′ 38″N; 940 16′ 18″LA-ICP-MS, U–Pb238.3 ± 2.29 (youngest age)c. −26.5 to +8.3Tin Tin Naing et al. (2013)
EoceneMinwun Range-Schwebo basin
Male FormationSandstone with sercite alteration in matrix is host-rock to Kyaukpatho gold mineralization (zircons n = 10; youngest zircon age)23° 47′ 55″ N, 95° 36′ 55″ ELA-MC-ICP-MS48.7 ± 0.7Khin Zaw (2002, 2008); Morley (2016); Myint Thein & Maung Maung (2017)