Feyissa et al. (2019) Transition from plume-driven to plate-driven magmatism in the evolution of the Main Ethiopian Rift , Journal of Petrology, 60, 1681-1715, doi:10.1093/petrology/egz043. < 20191025114120-527205 > pub
Table 2-1. Results of K-Ar dating for mafic volcanic rocks from NW plateau (Maychew) < 20191128120022-064572 > pub
measured unit BK01_K BK01_Ar1 BK01_Ar2 MA1905-K MA1905-Ar1 MA1905-Ar2 MA1809_K MA1809_Ar1 MA1809_Ar2 A5_K A5_Ar1 A5_Ar2 BK06_K BK06_Ar1 BK06_Ar2 MA06_K MA06-Ar1 MA06-Ar2 TS-12_K TS-12_Ar1 TS-12_Ar2 TS35_K TS35_Ar1 TS35_Ar2 TS35_Ar3 TS38_K TS38_Ar1 TS38_Ar2 TS43_K TS43_Ar1 TS43_Ar2 TS43_Ar3 TS43_Ar4 TS45_K TS45_Ar1 TS45_Ar2
latitude N12°46′0.0″ - - N12°52′0.0″ - - N12°49′60.0″ - - N12°52′0.0″ - - N12°49′60.0″ - - N12°49′60.0″ - - N12°52′0.0″ - - N12°52′0.0″ - - - N12°52′0.0″ - - N12°52′0.0″ - - - - N12°52′0.0″ - -
longitude E39°31′0.0″ - - E39°32′60.0″ - - E39°34′0.0″ - - E39°32′60.0″ - - E39°30′0.0″ - - E39°34′0.0″ - - E39°30′0.0″ - - E39°30′0.0″ - - - E39°30′0.0″ - - E39°30′0.0″ - - - - E39°30′0.0″ - -
age Ma - 27.55 (0.72) 27.95 (0.72) - 28.16 (0.71) 28.52 (0.73) - 28.06 (0.7) 28.21 (0.71) - 28.05 (0.7) 27.82 (0.7) - 22.64 (0.57) 22.88 (0.58) - 28.15 (0.71) 27.86 (0.72) - 25.64 (0.65) 25.82 (0.66) - 21.68 (0.63) 21.39 (0.62) 21.62 (0.62) - 28.46 (0.72) 28.05 (0.71) - 23.7 (0.7) 23.85 (0.7) 23.8 (0.7) 23.86 (0.7) - 20.88 (0.54) 21.24 (0.55)
[K] a cg/g 1.26 - - 1.16 - - 1.12 - - 1.2 - - 1.15 - - 1.69 - - 1.02 - - 1.05 - - - 0.789 - - 0.37 - - - - 0.497 - -
36Ar b pg/g - 4.662 (0.079) 3.527 (0.075) - 1.17 (0.019) 1.025 (0.018) - 1.125 (0.018) 0.976 (0.016) - 0.899 (0.014) 0.865 (0.014) - 2.215 (0.039) 2.319 (0.037) - 1.561 (0.026) 2.04 (0.034) - 1.008 (0.016) 1.072 (0.018) - 2.558 (0.066) 2.622 (0.066) 2.672 (0.067) - 1.383 (0.023) 1.269 (0.021) - 1.611 (0.042) 1.602 (0.042) 1.542 (0.04) 1.566 (0.04) - 1.796 (0.029) 1.85 (0.031)
40Arrad b ng/g - 2.423 (0.041) 2.459 (0.041) - 2.28 (0.036) 2.309 (0.037) - 2.193 (0.032) 2.206 (0.034) - 2.35 (0.036) 2.33 (0.037) - 1.815 (0.029) 1.835 (0.029) - 3.32 (0.054) 3.286 (0.054) - 1.824 (0.029) 1.838 (0.03) - 1.587 (0.039) 1.564 (0.039) 1.582 (0.039) - 1.567 (0.025) 1.544 (0.025) - 0.611 (0.016) 0.615 (0.016) 0.614 (0.016) 0.616 (0.016) - 0.723 (0.012) 0.736 (0.012)
40Ar/36Ar b - 757.7 (3.7) 761.5 (3.8) - 1952.0 (11.0) 2186.0 (22.0) - 1939.0 (7.0) 2185.0 (15.0) - 2464.0 (18.0) 2531.0 (16.0) - 1010.0 (15.0) 987.4 (4.5) - 2121.0 (13.0) 1697.0 (10.0) - 1817.0 (10.0) 1749.0 (11.0) - 849.5 (2.2) 828.7 (2.2) 824.6 (1.8) - 1267.0 (7.0) 1336.0 (7.0) - 635.1 (1.4) 639.3 (1.9) 649.6 (1.2) 645.4 (1.5) - 645.5 (2.9) 641.5 (2.9)
air fraction b % - 38.8 38.5 - 14.4 12.8 - 14.4 12.7 - 11.2 10.9 - 28.6 29.4 - 13.4 17.0 - 15.4 16.1 - 34.7 35.5 35.7 - 22.5 21.3 - 46.4 46.1 45.3 45.5 - 45.0 45.3
(a) determined by Flame emission spectrometry on Shimadzu AA6200
(b) determined by isotope dilution mass spectrometry with 38Ar spike on Micromass VG5400
name physical-form quantity unit global-id
BK01_K pub powder 20191128140817-265736
BK01_Ar1 pub 20191120104859-208864
BK01_Ar2 pub 20191120104859-168778
MA1905-K pub powder 20191121093633-453065
MA1905-Ar1 pub 20191121093633-906401
MA1905-Ar2 pub 20191121093633-030510
MA1809_K pub powder 20191128140832-481769
MA1809_Ar1 pub 20191128134730-221978
MA1809_Ar2 pub 20191128134730-311727
A5_K pub powder 20191128140533-012038
A5_Ar1 pub 20191128140116-144355
A5_Ar2 pub 20191128140116-391665
BK06_K pub powder 20191128141337-442792
BK06_Ar1 pub 20191128141337-935286
BK06_Ar2 pub 20191128141337-665481
MA06_K pub powder 20191128144451-644764
MA06-Ar1 pub 20191128144451-970747
MA06-Ar2 pub 20191128144451-808173
TS-12_K pub 20191128151432-057556
TS-12_Ar1 pub 20191128151432-487875
TS-12_Ar2 pub 20191128151432-056018
TS35_K pub powder 20150331090009-324463
TS35_Ar1 pub 20150331090019-846322
TS35_Ar2 pub 20150331090027-742331
TS35_Ar3 pub 20191128153642-641936
TS38_K pub powder 20191128154040-086845
TS38_Ar1 pub 20191128154040-100149
TS38_Ar2 pub 20191128154040-258959
TS43_K pub 20150331085930-663836
TS43_Ar1 pub 20150331085939-811182
TS43_Ar2 pub 20150331085955-517007
TS43_Ar3 pub 20191128155532-865791
TS43_Ar4 pub 20191128155532-839830
TS45_K pub powder 20191129093704-782098
TS45_Ar1 pub 20191129093704-102322
TS45_Ar2 pub 20191129093704-917831

The table is created from analysis shown below. The rowname K-Ar dating (Dejene et al., 2017) filters out analysis. Upper analysis has priority.To list more analysis, add a stone in stone sub-tab.

  • name
    technique
    device
    priority
BK01_K BK01_Ar1 BK01_Ar2 MA1905-K MA1905-Ar1 MA1905-Ar2 MA1809_K MA1809_Ar1 MA1809_Ar2 A5_K A5_Ar1 A5_Ar2 BK06_K BK06_Ar1 BK06_Ar2 MA06_K MA06-Ar1 MA06-Ar2 TS-12_K TS-12_Ar1 TS-12_Ar2 TS35_K TS35_Ar1 TS35_Ar2 TS35_Ar3 TS38_K TS38_Ar1 TS38_Ar2 TS43_K TS43_Ar1 TS43_Ar2 TS43_Ar3 TS43_Ar4 TS45_K TS45_Ar1 TS45_Ar2