Table A3.

Isotopic ages and data from the Mon and Taninthayi areas, southern Myanmar covering the Early Cretaceous ‘Tin Belt’ and the Late Cretaceous–Early Eocene Tin Belt of the ‘Inner Arc’ (Fig. A2)

Lithology (sample number) (number of mineral grains analysed)LocationDating methodAge ± error (Ma)MSWD87Sr/86SrϵNd (T)Zircon ϵHf (2σ)Zircon δ18OZircon Ce/Ce* (1σ)Zircon Eu/Eu* (1σ)ReferencesNotes
Mawpalaw TaungBiotite granite (E4) (zircons n = 15) samples from SE part of Wekami village.15° 45′ 35″ N, 97° 50′ 35″ ELA-MC-ICP-MS121.3 ± 1.11.2Mi Paik & Khin Zaw (2014), Mi Paik (2017)
Thanbyuzayat TownshipTin-bearing pegmatitic dyke (Q3) (12 zircons analysed)15° 45′ 29″ N, 97° 49′ ELA-MC-ICP-MS106.8 ± 1.6Mi Paik & Khin Zaw (2014), Mi Paik (2017)Age of hydrothermal pegmatitic tin mineralization is taken as the youngest zircon age
Sample from eastern part of Kyaikkazan TaungZircon xenocryst ages 400–450 Ma
Garnet-bearing muscovite biotite granite (Q7) (zircons n = 4)15° 48′ 46″ N, 97° 47′ 01″ ELA-MC-ICP-MS118.9 ± 2.90.032Mi Paik (2017)Cluster of zircon xenocryst ages c. 450 Ma
Quartz microdiorite (R6) (zircons n = 4), sample from near Yemangan Chaung15° 46′ 6″ N, 97° 48′ 5″ ELA-MC-ICP-MS113.2 ± 1.61.05Mi Paik (2017)
Close to Dawei tin districtGranite (MY37) (zircons n = 11 with 19 analyses; n − 4 zircons with U > 500 ppm)14.19844° N, 98.11549° EIMS 1280 ion microprobe69.5 ± 1.01.9Gardiner et al. (2016)Intersection with concordia curve interpreted to reflect magmatic crystallization age
Granite (MY37) (zircons n = 11 with 19 analyses; n = 14 data points)14.19844° N, 98.11549° EWeighted ave 204Pb corrected 207Pb/206Pb age70 ± 132.5Gardiner et al. (2016)Age considered in close accord with above concordia age
DaweiBiotite + plagioclase + K-feldspar granite (MY71)14° 16′ 32″ N, 98° 15′ 37″ EU–Pb75.6 ± 8.8(2σ)c. −10.4 ± 1.16.3 ± 0.34.2 ± 0.90.03 ± 0.9Gardiner et al. (2017)
TaungphilaMonzogranite (TPL07) (zircons n = 15)14° 14′ 23″ N, 98° 20′ 48″ ELA-ICP-MS68.8 ± 1.00.10.996029c. −11c. −10 to −12Jiang et al. (2017)A-type granite derived from partial melting of meta-igneous rocks in Palaeo-proterozoic crust
HermyingyiAlkali feldspar aplite stockRb–Sr isochron59.5 ± 1.40.727 ± 10Lehmann & Mahawat (1989)Analyst: P. Muller (pers. comm. 1988)
(Hermyingi Mine)Medium–fine-grained leucocratic mesogranites (040A-K)14° 14′ N, 98° 21′ ERb–Sr isochron59 ± 20.20.7350 ± 0.0077Cobbing et al. (1992)
Granite (LB 040B) (8 analyses of 6 Type-2 zircons)14° 15 N, 98° 26′ EU–Pb SHRIMP61.7 ± 1.30.78Pickard et al. (1996)238U/206Pb older cores = rim ages of 69 ± 1 and 100 ± 2 Ma
Granite (HMG06) (zircons n = 19)14° 14′ 47″ N, 98° 20′ 51″ ELA-ICP-MS70.0 ± 0.40.91.395437c. −11.1c. −10.8 to −12.4Jiang et al. (2017)A-type granite derived from partial melting of meta-igneous rocks in palaeo-Proterozoic crust with an average TDM2 age of 1772 Ma (11 samples)
DaweiGranite (MY34) (zircons n = 18 with 20 analyses; 19 analyses gave regression line)14.1079° N, 98.2146° EIMS 1280 ion microprobe62.3 ± 0.62.1Gardiner et al. (2016)Regression line intersection with concordia gave magmatic crystallization age
Granite (MY34) (zircons n = 1 xenocryst)14.1079° N, 98.2146° E207Pb corrected 238U/206U age65.3Gardiner et al. (2016)Zircon xenocryst inherited age
Granite (MY34) (zircons n = 1 xenocryst)14.1079° N, 98.2146° E207Pb corrected 238U/206U age65.4Gardiner et al. (2016)Zircon xenocryst inherited age
DaweiBiotite + plagioclase + K-feldspar granite (MY72)14° 8′15″ N, 98° 7′ 6″ EU–Pb IMS 1280 ion microprobe64.1 ± 1.6(2σ)c. −7.0 ± 1.06.6 ± 0.316.9 ± 980.21 ± 0.1Gardiner et al. (2017)
Tawmore TaungPorphyritic biotite granite14° 05′ N, 98° 12′ ELA-MC-ICP-MS58.73 ± 0.54Su Su Hlaing et al. (2014)
Biotite granite14° 05′ N, 98° 12′ ELA-MC-ICP-MS60.52 ± 0.75Su Su Hlaing et al. (2014)
Auk BokMedium to coarse ineq mafic primary texture granite and K-feldspar leucogranite13° 48′ N, 97° 45.3′ ERb–Sr isochron35 ± 340.40.7083 ± 0.0003Cobbing et al. (1992)
(038B-K)
(LB 0381) (12 analyses of 9 light-grey zircons)SHRIMP U–Pb52.1 ± 0.60.84Pickard et al. (1996)Zircon populations at 81.1 ± 4.3, 71.1 ± 3 and 58.1 ± 4.5 Ma
(12 analyses of 8 white zircons)SHRIMP U–Pb49.7 ± 0.50.56Pickard et al. (1996)Youngest stage of zircon growth gives time of granite emplacement
Maingy IslandVery coarse inequigranular pink primary texture granite (036A-D)13° 48.9′ N, 97° 46.3 ERb–Sr isochron45 ± 20.50.7104 ± 0.0003Cobbing et al. (1992)
Biotite + plagioclase + K-feldspar granite (MY73)13° 40′ 12″ N, 98° 23′ 00″ EU–Pb IMS 1280 ion microprobe58.5 ± 0.5(2σ)c. −13 ± 1.27.1 ± 0.346.7 ± 8.10.24 ± 0.1Gardiner et al. (2017)
Biotite + plagioclase + K-feldspar granite (MY74)13° 34′ 05″ N, 98° 25′ 13″ EU–Pb IMS 1280 ion microprobe58.7 ± 0.6(2σ)≈−9.4 ± 1.17.2 ± 0.313.5 ± 410.20 ± 0.0Gardiner et al. (2017)
MyeikBiotite + plagioclase + K-feldspar granite (MY75)12° 41′ 31″ N, 98° 44′ 12″ EU–Pb IMS 1280 ion microprobe72.1 ± 1.3(2σ)c. −10.3 ± 1.47.7 ± 0.332.8 ± 440.07 ± 0.0Gardiner et al. (2017)
Quarry just north of MyeikGranite (MY76) (zircons n = 10, 14 analyses; some zircons with U > 35 000 ppm)12.29362° N, 98.41553° E204Pb corrected 207Pb/206Pb age75.3 ± 7.71.8Gardiner et al. (2016)Interpreted as age of magmatic crystallization
Biotite + plagioclase + K-feldspar granite (MY76)12° 29′ 36″ N, 98° 41′ 55″ EU–Pb IMS 1280 ion microprobe75.3 ± 7.7(2σ)c. −10.2 ± 3.46.2 ± 0.30.82 ± 3.70.04 ± 0.1Gardiner et al. (2017)
Parker & Trotter BCoarse ineq. K-feldspar megacrystic grey granite and primary texture granite (LB008, LB009A-D)12° 29.2′ N, 98° 9.1′ ERb–Sr isochron94 ± 143.80.7108 ± 0.0008Cobbing et al. (1992)
High IslandCoarse inequigranular K-feldspar megacrystic grey granite (LB034, LB034A-C)11° 56.9′ N, 98° 9.1′ ERb–Sr isochron46 ± 163.80.7156 ± 0.0009Cobbing et al. (1992)
Yadanabon granite (Yadanabon Mine)Granite (MY-YAD) (zircons n = 14, 12 analyses; 5 data points used and12 data points with U > 2000 ppm excluded)11.1745° N, 99.16098° EIMS 1280 ion microprobe50.3 ± 0.61.3Gardiner et al. (2016)
Pulo BaleighMedium-grained inequigranular grey primary texture granite (LB024A-B, LB025A, LB028, LB028A)11° N, 98° 16.4′ERb–Sr isochron51 ± 132.10.7152 ± 0.0005Cobbing et al. (1992)
Davis IslandCoarse inequigranular grey primary texture granite (030–030K)10° 25.5′ N, 98° 25.45′ ERb–Sr isochron57 ± 40.10.7091 ± 0.0004Cobbing et al. (1992)
KawsongCoarse inequigranular to K-feldspar megacrystic primary texture granite (LB 032A) (zircons n = 22)10° 7′ 30″ N, 98° 43′ 38″ ESHRIMP U–Pb82 ± 1.42.04Pickard et al. (1996)206U/238Pb inherited zircon ages: 662, 762, 1217, 1491 Ma