Table 4.

U–Th composition of whole rocks and separates

VolcanoSamplePhaseUTh(234U/238U)(238U/232Th)(230Th/232Th)
(ng g−1)±2σ(ng g−1)±2σ±2σ (‰)±2σ (‰)±2σ (‰)
LascarLA1wr16142.4541813.51.0010.80.9041.50.8041.9
gm18604.8626726.21.0021.70.9003.70.8032.3
px2410.58007.61.0031.10.9159.30.8498.5
LA2wr45059.41219436.81.0001.21.1212.20.8222.8
gm52479.41419858.61.0011.31.1213.70.8221.9
mt12343.0407088.31.0061.10.92021.60.80919.9
LA4wr518926.21418871.01.0021.51.1105.10.8224.1
plag4461.811563.91.0033.21.1714.00.8841.8
Callaqui08CA01wr17764.5660023.01.0002.00.8163.20.7994.2
gm20135.2753018.11.0042.60.8113.20.7992.6
ol350.5760.71.02514.71.38617.41.0996.7
plag490.11431.31.0461.11.0368.81.1478.8
mt750.11521.31.1331.31.4938.21.3137.2
08CA02wr17253.9636719.71.0001.20.8222.00.7892.7
gm20220.9750723.41.0031.50.8172.80.7902.1
ol470.11622.11.0042.00.87913.10.8477.4
px1170.44354.61.0023.00.81810.80.80110.2
plag210.1780.41.0304.60.8146.30.7944.2
08CA03wr21324.0801222.61.0011.00.8081.80.7892.4
gm27632.01040834.71.0031.50.8063.10.7902.1
px1000.73682.91.0037.00.82210.00.8005.1
plag290.1970.31.0091.60.9012.00.8891.9
mt4111.1143310.21.0191.10.8707.20.7865.9
Lonquimay08LO03wr8821.827106.91.0011.10.9881.70.8562.3
gm9461.829068.81.0041.30.9882.40.8562.9
ol730.61190.61.0214.21.8609.61.7132.7
mt1040.21471.41.0521.82.1459.31.4709.1
08LO04wr10511.932269.71.0010.50.9892.10.8592.1
gm10992.5336712.31.0031.30.9913.00.8642.0
ol1751.13941.61.0025.81.3476.61.1882.7
plag100.02280.31.0320.71.0829.21.0929.6
CalbucoCAJ10Awr3550.711703.41.0011.40.9212.30.8273.3
gm4000.913323.91.0051.40.9112.40.8191.5
px11151.42215.91.00012.41.58029.11.51623.1
px2890.11340.61.0051.02.0203.92.0171.5
mt2960.81230.40.9951.27.2982.38.4192.3
CAJ24wr3670.712173.61.0010.90.9152.00.8253.4
gm4600.914954.91.0051.20.9332.70.8471.8
plag370.1390.21.1441.62.8304.24.0074.5
mt11090.22402.01.0731.31.3738.11.6337.1
mt21070.32211.01.0732.51.4744.21.7202.9
CAJ18wr4751.815636.21.0023.30.9224.20.8312.4
px570.21051.01.0003.01.6289.51.5165.5
plag200.1470.91.0161.41.29418.61.14019.9
mt1210.41874.71.0073.91.96325.41.34422.3
CAJ23wr3300.610724.11.0010.70.9353.20.8353.8
gm4551.6143617.51.0043.50.96112.30.8579.0
px440.51301.81.00811.31.01317.60.89212.8
mt1580.1991.81.0841.31.79317.81.58017.1
mt2590.3971.71.0859.11.83917.81.61118.3
  • Abbreviations: gm, groundmass; mt, magnetite; ol, olivine; plag, plagioclase; px, pyroxene; wr, whole rock.