zone = Ethiopie
Données géochimiques des échantillons de type "CFB" du domaine "Afrique" dans la zone "Ethiopie" :
| Centre
Paris-Saclay
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Univ. Paris-Saclay

Données géochimiques des échantillons de type "CFB" du domaine "Afrique" dans la zone "Ethiopie" :



Jean-Louis JORON et Michel TREUIL
Laboratoire Pierre Süe
Centre d’Études de Saclay – France
Laboratoire Pierre Sue

Les analyses en éléments traces fournies ci-dessous concernent des roches prélevées par carottage terrestre, dragage ou forage océanique profond. Elles ont toutes été réalisées par la même technique : l’analyse par activation neutronique purement instrumentale(*) et en utilisant les mêmes données standards de calibration. La technique a été développée au Laboratoire Pierre Süe (CE Saclay).
*sans nécessité de mise en solution, source d'imprécisions dans le cas d'analyse de roches, du fait de la présence de minéraux "non solubles".

Référence :

Lexique :

  • CAB : calk-alkaline basalt / Basaltes calco-alcalins
  • CFB (Continental Flood Basalt) ou Trapps,
  • MORB : Middle Oceanic Ridge Basalt / Basaltes des rides médio-océaniques
  • OIB : Ocean Island Basalt / Basaltes des îles océaniques intraplaques
  • Subduction : roches issues de zones de subduction, lieu de destruction de la croûte océanique. Lorsqu’une plaque se heurte à une autre plaque, elle retourne dans le manteau en formant une zone de suduction.
  • Volcanisme d’arc insulaire : les arcs insulaires, répartis en bordure des zones de subduction, résultent de la formation de nouvelle croûte similaire à celle des continents
  • Volcanisme arrière-arc : en arrière d'un arc insulaire, formation de petits bassins dits "arrière-arcs". L’ouverture de ces bassins serait le signe précurseur de la formation d’un bassin océanique.
  • Ophiolite : roches correspondant à la lithosphère océanique, charriée sur un continent par obduction lors de la convergence de deux plaques lithosphériques
  • Magmatisme ancien Magmatisme antérieur à la tectonique des plaques actuelle (antérieur à 500 millions d'années)
    • Archéen : éon précédent le Protérozoïque (de - 4 à - 2.5 milliards d’années).
    • Basalte : roche magmatique rapidement refroidie. C'est le constituant principal de la croûte océanique.
    • Protérozoïque : éon (ou période géochronologique) de la fin du précambrien (de - 2,5 à - 0,541 milliards d’années).
    • Komatiite : roches témoins direct du manteau archéen à olivine et pyroxène.
    • Gabbro : roche magmatique, constituant principal de la couche inférieure de la croûte océanique.
    • Ophite : roche magmatique intermédiaire entre le gabbro et le basalte, qui résulte de la cristallisation d'un magma sans contact avec l'atmosphère .
  • Birimien : âge stratigra^phique équivalent à l'époque paléoprotérozoïque du précambrien (-2.5 à -1.6 Milliards d'années).
  • Les roches de cet âge morceau de croûte terrestre (terrane), essentiellement composé de granites alcalins, agrégé à l'aire continentale sud (craton) de l'Afrique de l'Ouest, âgé de
  • Shale : roche sédimentaire n'ayant pas subi de transformation (métamorphisme) et censée représenter la composition de la croûte continentale primitive.
  • Chondrite et achondrite : météorites avec ou sans "chondres", petites billes composées de silicates, traduisant leur origine primitive ou issue d'astéroïdes.
Echelle des temps géologiques du BRGM.

NB : les références des échantillons suivies de "(d)" indiquent de nouvelles analyses sur des échantillons, précédemment analysés.

TypeDomaineZoneLieuMissionMethode, Age, Eruption, CommentaireFichier localisationÉchantillon / SampleScCrCoNiRbSrZrSbCsBaLaCeNdSmEuTbYbHfTaThUWAsMoBrAu (ppb)Ag (ppb)ZnNa (%)Fe (%)Altitude_stratigraphique
CFBAfriqueEthiopieAshangiEchantillons ZanettinS4538.1023854.700117.0022.26144050.10.11200.036.00844.001.5209.483.9003.6200.890
CFBAfriqueEthiopieAshangiS5042.6013759.90089.0016.95853710.090.12186.035.70843.751.3309.324.1003.4900.470
CFBAfriqueEthiopieAshangiS5123.9010544.00032.0029.55653370.180.43244.031.501223.491.3006.952.6903.8601.210
CFBAfriqueEthiopieAshangiS5245.4011363.00088.0026.96024060.10.4217.035.60112.74.001.3909.354.3603.5101.010
CFBAfriqueEthiopieAshangiS5426.909138.00042.0035.85673750.180.3337.038.40154.83.541.3708.383.2504.9201.530
CFBAfriqueEthiopieAshangiS5631.209544.00028.005.94321640.10.17127.014.8044.82.080.7904.151.1701.3700.500
CFBAfriqueEthiopieAshangiS6031.0010550.00059.0011.74161700.170.2162.011.7042.62.010.8503.730.8801.4800.390
CFBAfriqueEthiopieAshangiS6231.009951.00062.0011.94211790.170.18156.012.3041.72.000.8503.770.8701.4800.480
CFBAfriqueEthiopieAshangiS6331.608452.00046.003.64302040.140.09127.013.8047.62.170.9904.420.9701.7700.530
CFBAfriqueEthiopieAshangiS6428.106839.00022.0029.14582460.130.8325.020.0061.42.460.9905.131.3002.3800.880
CFBAfriqueEthiopieAibaS7429.6013537.80027.0018.45423300.030.16346.028.20703.171.2007.292.2802.4700.680
CFBAfriqueEthiopieAibaS7831.4010241.40035.0017.15192870.010.05284.026.10663.091.1507.122.1802.4200.550
CFBAfriqueEthiopieAibaS8032.4020140.80046.0022.14612910.070.26278.022.20542.781.0706.61.8002.2200.560
CFBAfriqueEthiopieAibaS8326.909636.50051.0027.25543520.130.56286.036.60733.251.3308.112.9404.3601.310
CFBAfriqueEthiopieAibaS8524.807632.10015.0034.16173570.120.6353.040.70904.001.4309.083.2004.7801.480
CFBAfriqueEthiopieAibaS8625.609141.00040.0029.15803750.150.5336.039.40783.461.3408.443.1705.0701.550
CFBAfriqueEthiopieAibaS8825.109138.40047.0034.15563660.160.74311.036.80753.611.3708.33.0604.9001.570
CFBAfriqueEthiopieAibaS9129.807543.40018.00114301410.210.35174.014.30322.600.7604.041.0801.5200.560
CFBAfriqueEthiopieAibaS9330.4010949.00057.009.14642440.10.09187.023.00522.811.1206.362.1302.5600.700
CFBAfriqueEthiopieAibaS9431.6011139.10023.0014.96072360.080.31745.026.30584.041.2003.991.5002.2700.650
CFBAfriqueEthiopieAibaS9532.2011737.10019.0016.85861710.210.3751.025.60673.881.1903.811.4302.1000.620
CFBAfriqueEthiopieAibaS9631.6012836.10021.00195522030.040.39715.027.00643.891.2204.221.5402.4600.660
CFBAfriqueEthiopieAibaS9736.7013245.10035.0014.14082550.250.23304.022.90553.111.0106.271.5202.2200.660
CFBAfriqueEthiopieAlaji (Oligocéne)S16932.2010938.80024.0022.35462070.080.39721.026.60573.661.1604.21.5102.4200.770
CFBAfriqueEthiopieAlaji (Oligocéne)S17033.9010541.40027.0013.35062480.060.27886.028.20583.941.2404.461.5802.6300.650
CFBAfriqueEthiopieAlaji (Oligocéne)S17231.6010536.10023.0020.55052380.060.37731.027.40583.701.1504.31.5202.4700.840
CFBAfriqueEthiopieAlaji (Oligocéne)S17332.2010338.00024.0022.65062020.080.38719.026.70573.751.1804.291.5202.4500.650
CFBAfriqueEthiopieAlaji (Miocéne)S18934.9010550.00038.0036.74983270.120.57267.034.001153.681.1708.142.7804.2901.110
CFBAfriqueEthiopieAlaji (Miocéne)S19133.608045.00016.0031.15982580.010.93439.032.40902.821.1105.891.8804.3900.580
CFBAfriqueEthiopieAlaji (Miocéne)S19231.108048.00035.0022.75112700.020.22490.030.20892.791.1907.661.7302.7400.630
CFBAfriqueEthiopieAlaji (Miocéne)S19330.709348.00034.0019.25083020.090.26434.029.40762.791.1906.461.7502.4100.580
CFBAfriqueEthiopieAlaji (Miocéne)S19431.2036446.500129.0026.64071470.070.35406.017.00421.580.8103.990.9303.5600.710
CFBAfriqueEthiopieAlaji (Miocéne)S19626.105934.50010.0046.74153880.10.59481.046.901163.121.3108.422.9108.0301.440
CFBAfriqueEthiopieTermaber GuassaS17429.807749.70026.0037.16973070.67406.035.202.570.8205.982.7405.2901.090
CFBAfriqueEthiopieTermaber GuassaS25734.6010946.60033.0013.94771410.040.58283.019.601.770.7203.51.8102.0800.470
CFBAfriqueEthiopieTermaber GuassaS25818.207529.3002.0029.48762240.29700.049.103.441.1204.614.0604.3101.010
CFBAfriqueEthiopieTermaber MeghezezS27440.4012567.20062.0014.27333120.160.1443.034.003.001.0606.92.7803.2300.700
CFBAfriqueEthiopieTermaber MeghezezS27835.6015454.10078.0026.18323030.170.23373.045.602.831.0706.73.7605.1401.140
CFBAfriqueEthiopieTermaber MeghezezS28025.307153.50018.0022.36652230.190.19358.032.802.670.8905.12.8003.7900.920
CFBAfriqueEthiopieTermaber MeghezezS28227.7010045.90050.00255682840.120.1259.031.502.511.01062.6103.3100.820
CFBAfriqueEthiopieTermaber MeghezezS28523.6034148.500224.0024.67352450.080.32387.031.101.870.6503.63.5604.0700.990
CFBAfriqueEthiopieTermaber MeghezezS28929.8044255.800208.0029.912833770.290.48715.084.703.201.0904.15.3209.0102.560
CFBAfriqueEthiopieGaramullattaEchantillons Peter Jones3091130.006645.00027.0030.54162360.060.25380.030.802.530.9905.761.9105.4201.010
CFBAfriqueEthiopieGaramullatta3091628.3036054.900245.0018.56442150.040.12346.025.302.240.8404.731.9102.7100.540
CFBAfriqueEthiopieGaramullatta3091930.2016246.70099.00175531830.060.08344.028.602.340.8805.121.7903.4100.560
CFBAfriqueEthiopieGaramullatta3092428.806847.60032.00145232720.090.15258.028.202.751.0606.172.1103.3300.920
CFBAfriqueEthiopieGaramullatta3093128.607248.60033.0018.84972660.090.32253.028.602.701.0406.012.0903.1700.630
CFBAfriqueEthiopieGaramullatta3094029.707848.40033.0018.84782470.060.34291.026.802.921.0805.82.0403.1800.800
CFBAfriqueEthiopieGaramullatta3094330.3010747.00056.0014.54862680.060.19315.026.303.121.0905.791.8402.8100.760
CFBAfriqueEthiopieGaramullatta3094430.9010446.40057.0013.15612740.070.28297.026.703.111.0805.941.9302.7600.590
CFBAfriqueEthiopieAbbai gorge3041936.1014849.00035.0016.45102860.070.17285.021.203.001.0205.851.4402.0100.690
CFBAfriqueEthiopieAbbai gorge3042333.2011138.90023.0022.43092340.060.4778.027.304.551.2404.451.5602.5100.800
CFBAfriqueEthiopieAbbai gorge3043130.708146.20040.0020.74522810.180.39253.027.402.581.2507.32.5803.2601.030
CFBAfriqueEthiopieAbbai gorge3043330.5013747.20078.0015.13382280.110.19149.020.101.950.9605.331.9502.1800.660
CFBAfriqueEthiopieMugher3095127.209245.10027.0030.36252050.110.15390.035.702.520.9105.892.9204.4501.080
CFBAfriqueEthiopieMugher3096326.008842.80028.00255842570.060.09457.034.702.400.8906.042.6404.3300.780
CFBAfriqueEthiopieMugher3096730.5022753.500103.0023.35331920.080.17314.028.602.130.8104.942.4003.7500.790
CFBAfriqueEthiopieMaichew3087837.2046251.300145.0022.36513250.110.16315.028.702.901.1507.762.6002.8100.730
CFBAfriqueEthiopieMaichew3087937.30120775.900542.0016.78462130.070.15202.020.102.060.8505.41.7502.0900.560
CFBAfriqueEthiopieMaichew3088044.2049468.500325.0017.84722100.120.14139.025.002.781.0206.452.5502.8000.890
CFBAfriqueEthiopieMaichew3088133.009644.30038.0016.26043190.050.05287.027.803.191.2907.962.3402.5500.650
CFBAfriqueEthiopieMaichew3088234.5017344.40048.0030.44842730.070.2295.025.202.941.2107.281.9002.9200.770
CFBAfriqueEthiopieJijiga3041234.6012949.70057.004.54622110.050.21200.015.302.170.8103.851.2001.4100.390
CFBAfriqueEthiopieJijiga3041337.907850.00033.00183792020.060.19253.019.502.311.0105.21.4702.9100.610
CFBAfriqueEthiopieJijiga3041436.1011949.30052.0017.43812730.070.18180.023.002.701.2207.081.6902.7200.720
CFBAfriqueEthiopieAisha3040524.005440.40015.5024.14671650.060.19411.023.701.640.6703.771.7202.5300.520
CFBAfriqueEthiopieCassam3044036.108345.20030.0022.53702800.070.26387.026.802.591.1406.261.7402.9400.730
CFBAfriqueEthiopieCassam3044428.408939.00050.0025.74292460.070.34374.025.002.491.0805.681.5603.1600.780
CFBAfriqueEthiopieCassam3044635.709145.50030.0019.53692810.080.21383.027.202.571.1305.041.7402.8900.810
CFBAfriqueEthiopieWolkefit pass3097525.309150.300121.006.43931330.050.06216.09.101.390.6502.880.4300.7400.220
CFBAfriqueEthiopieWolkefit pass3097928.4038057.300257.004.44981200.050.12163.06.701.310.6202.490.4200.6600.230
CFBAfriqueEthiopieWolkefit pass3098127.708854.900118.009.34741390.030.09259.010.301.700.7703.340.4700.7300.320
CFBAfriqueEthiopieWolkefit pass3099227.2014143.90066.006.64551440.0090.11236.010.901.610.8703.410.4801.1200.270
CFBAfriqueEthiopieWolkefit pass3099733.6012351.90053.0010.63682120.050.17246.012.302.091.0604.580.6601.2000.450
CFBAfriqueEthiopieWolkefit pass3100022.006726.40010.0019.612612680.060.37635.022.603.381.2806.591.3701.4400.390
CFBAfriqueEthiopieAdigrat3089528.0014050.80066.003.62871130.020.0145.05.801.350.6102.550.3300.3700.150
CFBAfriqueEthiopieAdigrat3089727.709147.10037.003.63261110.040.0676.07.301.460.6702.910.3500.3800.210
CFBAfriqueEthiopieAdigrat3090125.6010852.90066.004.15071620.030.05148.08.102.080.8704.140.4300.4600.120
CFBAfriqueEthiopieAdigrat3090320.207440.50027.0040.515363330.060.37219.019.303.261.1407.231.1501.0600.450
CFBAfriqueEthiopieAdigrat3090632.207443.90020.0020.55482450.060.34431.025.203.221.1604.871.8002.3700.830
CFBAfriqueEthiopieAdigrat3090731.709039.40023.0021.15542120.080.38604.028.303.391.1204.431.5302.5900.870
CFBAfriqueEthiopieAdigrat3094734.3021556.100171.005.14271160.020.04113.07.301.410.7002.960.3500.5000.180
CFBAfriqueEthiopieAdigrat3088519.109865.200101.0011.49393250.070.33134.016.403.230.9707.831.3101.2100.390
CFBAfriqueEthiopieAdigrat3089118.408958.50073.0011.99593980.080.19130.017.103.370.9908.591.3801.1900.470
CFBAfriqueEthiopieAdigratEchantillons PickE 21628.1025963.200255.009.54381610.0161.0792.05.7818.212.45.161.770.7932.364.240.2210.3200.1300.220.550.253972.739.35
CFBAfriqueEthiopieAdigratE 216 (d)27.4025561.800248.009.44191540.0071.0289.05.1217.612.44.951.790.7462.263.880.2090.3000.1300.10.360.053.539882.699.07
CFBAfriqueEthiopieAdigratE 22031.001538.30015.5017.85311610.0550.31523.025.9161.438.79.613.241.1162.634.381.5882.2100.7200.761.710.441262.739.81
CFBAfriqueEthiopiesud du plateauE 6630.60743.90041.0022.84212570.190.43247.028.996740.69.753.101.2973.217.652.5373.1751.0800.91.962.031.312.21492.019.89
CFBAfriqueEthiopieN-NW du plateauE 8425.705550.700113.003.1290720.0080.03101.04.8912.46.63.071.090.1662.252.020.2410.2800.1200.090.550.1812.1052.327.93
CFBAfriqueEthiopieN-NW du plateauE 84 (d)25.208049.300109.003.2285630.0220.0392.04.68128.23.031.140.5472.161.930.2300.2580.0840.150.380.129.4882.267.65
CFBAfriqueEthiopieN-NW du plateauE 9830.3016842.60069.005.23081130.0330.14109.08.4221.611.54.321.550.8072.573.20.5360.7700.2900.170.890.37601062.138.15
CFBAfriqueEthiopieN-NW du plateauE 20224.401350.70098.003.84461020.0220.01245.09.832412.64.421.520.7192.442.750.3830.3940.1600.150.481152.48.59
CFBAfriqueEthiopieN-NW du plateauE 202 (d)24.904851.40099.004.54501010.0050.01247.09.8623.78.74.631.570.7152.452.710.3810.4060.1300.040.530.121092.488.68
CFBAfriqueEthiopieN-NW du plateauE 9431.406940.20066.005.24111470.0280.10274.011.712913.95.481.710.8942.824.090.4981.4500.3600.440.750.143.2781052.348.2
CFBAfriqueEthiopieN-NW du plateauE 94 (d)30.909241.00064.004.83959700.0340.11265.011.3127.922.45.341.780.8512.733.960.4841.3950.3600.380.950.230.2142982.268.04
CFBAfriqueEthiopieN-NW du plateauE 20327.901147.10060.007.12941280.0340.09183.09.7323.321.24.311.400.7092.363.280.4541.2100.3400.10.280.770.185.71051.98.37
CFBAfriqueEthiopieN-NW du plateauE 203 (d)28.304846.00061.006.62981180.0270.10179.09.322311.84.281.510.7032.363.210.4511.1750.3600.20.190.630.322.757992.28.41
CFBAfriqueEthiopieLima - Limo98 EH 17017.40527.80013.0014.68582050.0210.16521.018.3544.215.47.352.640.9792.845.341.0781.0300.2900.230.921021053.256.68
CFBAfriqueEthiopieLima - Limo98 EH 16618.30632.30023.0011.99642200.0330.04701.021.7953.532.97.822.590.9872.85.281.0191.0500.4101.351.2613.651103.117
CFBAfriqueEthiopieLima - Limo98 EH 15123.80650.30036.00146871920.0180.17564.015.7340.525.27.132.631.0092.775.10.7930.8630.1900.180.921.31192.6110.0
CFBAfriqueEthiopieLima - Limo98 EH 14723.303341.60080.007.73811360.0210.16319.011.6428.815.94.951.660.8202.563.710.5201.2900.3300.692.126962.467.71
CFBAfriqueEthiopieLima - Limo98 EH 14216.50527.50020.0013.69402030.0180.09739.020.3949.632.97.142.370.9072.244.820.7200.8900.280 0.291.190.8993.046.72
CFBAfriqueEthiopieLima - Limo98 EH 13735.204747.40045.0014.22721670.0640.31289.013.3835.120.56.552.131.1534.145.160.6101.9700.7700.11.021.310.392.81342.329.89
CFBAfriqueEthiopieLima - Limo98 EH 13523.305441.00094.0043531000.0350.09142.07.2518.111.83.871.400.7192.482.920.3030.7700.2700.30.630.367.677892.377.02
CFBAfriqueEthiopieLima - Limo98 EH 13033.80842.60027.0013.23592130.1150.35326.015.9341.7267.282.301.1483.735.360.7301.5760.5201.341.480.461182.549.58
CFBAfriqueEthiopieLima - Limo98 EH 12629.006140.80061.004.43881330.0230.07251.010.4226.417.94.91.710.8022.623.670.4461.2940.3100.160.81.3952.187.77
CFBAfriqueEthiopieLima - Limo98 EH 11328.101051.50070.006.44291400.0360.05322.012.6829.7155.411.780.8742.843.930.6010.9850.3100.120.680.121222.539.34
CFBAfriqueEthiopieLima - Limo98 EH 12126.7025652.400176.003.6327960.0050.01171.07.1718.116.23.731.290.6472.122.550.3770.4700.1600.40.080.431042.057.85
CFBAfriqueEthiopieLima - Limo98 EH 0130.00541.70023.0026.64651830.0640.50732.026.9961.529.57.652.870.9962.714.481.7283.6100.8200.40.551.650.38201202.639.49
CFBAfriqueEthiopieLima - Limo98 EH 0232.70943.20034.0013.46791700.050.30746.024.2160.536.99.243.171.0872.44.131.5342.0470.6900.611.410.490.8341132.339.97
CFBAfriqueEthiopieCorbettiC3827.801640.00024.40117201640.0450.06415.023.4052.228.45.831.880.7352.183.951.9292.1300.5800.20.381.961042.88.09
CFBAfriqueEthiopieCorbettiC3037.1054.20035.0011.45151690.050.62375.023.9056.338.37.752.831.0082.764.482.0831.4110.3900.511.350.741.41512.3512.2
CFBAfriqueEthiopieCorbettiC211.220.0600.6010813590.261.2580.2164.7034914333.75.194.50016.434.013.76017.2204.8301.61.8610.15.672.5712823.623.12
CFBAfriqueEthiopieCorbettiC221.300.0301.00108.313330.281.2481.3168.8034914734.65.174.57016.433.812.74017.0704.9401.91.959.345.32803.753.11
CFBAfriqueEthiopieCorbettiC221.3030.1101.80113.514450.31.2783.0164.7035416733.95.184.57017.234.713.76017.6604.6402.11.998.355.492973.713.17
CFBAfriqueEthiopieCorbettiC231.291.50.0303.50112.13900.271.2786.0170.1036115534.95.224.66017.035.014.02017.7705.0001.62.39.7462.82853.893.19
CFBAfriqueEthiopieCorbettiC241.220.0300.80113.14380.281.2863.0171.5036315735.35.254.71017.135.714.15017.9405.2001.92.149.626.161.52863.723.17
CFBAfriqueEthiopieCorbettiC251.9150.1700.90106.911930.231.4125.8147.20299119.27.42.963.61013.930.011.27015.4504.0801.61.710.06.242253.382.91
CFBAfriqueEthiopieCorbettiC260.9130.2200.7045.2554640.161.3222.567.60111.581.418.02.212.5318.6211.14.2106.1202.1500.91.763.152.91921.21.14
CFBAfriqueEthiopieCorbettiC271.810.1701.30103.11500.221.1625.1143.80293119.26.82.943.55013.929.511.39015.1504.1301.21.679.297.062.62173.482.82
CFBAfriqueEthiopieCorbettiC281.700.5600.40100.11640.211.0422.8139.90291121.25.82.853.43013.529.511.11014.9804.0902.51.629.226.9812173.432.8
CFBAfriqueEthiopieCorbettiC291.820.0300.5098.911400.210.9729.8137.90286113.25.72.873.47013.429.311.06014.8504.1801.879.77.61512133.262.78
CFBAfriqueEthiopieCorbettiC312.950.0400.6094.910840.241.0539.5122.0026013125.13.553.3701326.810.98013.8803.8201.51.667.767.112413.533.75
CFBAfriqueEthiopieCorbettiC321.320.0301.30118.14790.281.3169.1175.8037915635.85.574.87017.737.014.73018.6205.1402.12.0810.75.9217.983023.973.32
CFBAfriqueEthiopieCorbettiC331.270.0300.50115.814400.261.2983.7171.9036716235.25.304.71017.235.914.50018.1404.9500.82.1810.56.110.82973.943.26
CFBAfriqueEthiopieCorbettiC341.2560.0500.50118.15070.291.3565.5180.8037819137.35.234.84017.736.514.77018.7705.3401.62.3610.35.571.12963.933.32
CFBAfriqueEthiopieCorbettiC351.270.0301.80118.514550.281.3384.7176.6037916836.05.424.87017.636.814.67018.5905.1001.52.059.485.622.61423013.963.35
CFBAfriqueEthiopieCorbettiC361.260.0901.0011414270.281.2989.3171.9036715434.95.264.70017.035.514.21017.9804.9702.1610.05.585.5712943.93.26
CFBAfriqueEthiopieCorbettiC371.290.0400.40118.14290.291.3286.8175.8037815135.65.654.81017.736.714.57018.5105.1301.62.149.965.682.22953.993.31
CFBAfriqueEthiopieCorbettiC391.250.8100.50117.715260.31.3272.0163.0036916933.45.334.64017.936.214.35018.4404.5902.51.998.915.583043.753.27
CFBAfriqueEthiopieCorbettiC402.9220.0500.30107.11980.251.232.1135.00290121.26.84.083.75014.630.412.10016.2504.5201.32.1697.732584.023.8
CFBAfriqueEthiopieFentaleF3918.200.5200.5044.51943380.1160.472025.054.30119.461.212.65.521.6336.2494.9626.1901.5500.923.172.250.61734.337.35
CFBAfriqueEthiopieFentaleF3230.402348.10043.0017.15281650.0370.14463.026.4060.831.36.882.470.8772.523.982.2702.0340.5800.51.710.842.41142.779.5
CFBAfriqueEthiopieFentaleF311.750.1300.4089267830.261.1669.091.90192.48518.33.842.56010.419.89.15013.3403.5501.425.265.840.81933.914.15
CFBAfriqueEthiopieFentaleF338.090.2100.9051.3573990.120.43048.056.60127.360.313.55.231.7627.129.75.6106.6001.7700.70.472.161.631484.665.97
CFBAfriqueEthiopieFentaleF422.650.0902.0062.1194650.1610.61675.072.90163.276.518.15.342.4858.5812.16.4867.5902.0301.91.414.614.372205.047.56
CFBAfriqueEthiopieFentaleF442.240.2001.1092.7208230.291.1923.096.702079420.14.912.94011.320.510.28012.8503.3301.32.516.845.722494.695.4
CFBAfriqueEthiopieFentaleF383.620.1500.3078.7646780.1860.441032.082.90170.274.916.43.932.3539.4817.58.12711.6301.7103.10.633.454.5415.1974.853.96
CFBAfriqueEthiopieFentaleF341.810.5700.60143.1812000.451.69154.0138.7027812325.14.183.53014.730.114.24020.9705.5204.189.596.671.31262354.14.02
CFBAfriqueEthiopieFentaleF351.760.2601.5083.2208370.260.54605.092.9019385.918.24.132.57010.820.49.30013.7303.8401.11.224.851.383.72083.934.2
CFBAfriqueEthiopieFentaleF361.680.1301.70107.109890.351.21794.0110.60236114.22.95.693.24412.923.811.30015.1403.8501.52.917.15.162674.745.17
CFBAfriqueEthiopieFentaleF371.560.0821.20111.59130.351.42704.0120.1024811324.45.523.43013.123.011.65015.5904.2802.32.989.68.491.82524.565.32
CFBAfriqueEthiopieFentaleF401.340.0700.80121219980.371.41456.0124.2025714225.05.663.5701425.712.52017.0704.4501.93.389.047.52804.645.45
CFBAfriqueEthiopieFentaleF411.410.0940.95118.16.310360.371.48716.0125.10267.413126.06.623.73014.525.112.45016.6504.2701.83.038.418.562934.835.77
CFBAfriqueEthiopieFentaleF431.4030.1700.20154413290.481.78137.0144.5029414025.84.533.87015.932.415.41022.0105.3302.34.718.376.75502764.294.44
CFBAfriqueEthiopieGedemsaG1631.302456.00078.009.75351110.0410.08191.015.9036.318.24.411.660.5781.592.841.5461.6060.4500.451.130.420.6952.318.97
CFBAfriqueEthiopieGedemsaG1428.0039449.100146.00284271520.0660.28334.023.6052.4345.551.720.7052.184.031.9643.4800.7500.71.671.230.687912.337.8
CFBAfriqueEthiopieGedemsaG150.350.1700.201552411860.331.89131.0168.1030016431.25.354.51015.229.412.24020.4803.8501.31.182.022.621123092.685.21
CFBAfriqueEthiopieGedemsaG171.240.3200.30109.46650.351.3766.187.00184.385.917.23.172.3208.6117.77.92214.8003.60022.187.145.642034.444.87
CFBAfriqueEthiopieGedemsaG180.540.1200.50138610390.291.5285.0117.10256.5114244.433.36012.625.810.62018.2704.0402.02.398.137.992694.515.27
CFBAfriqueEthiopieSérie stratoïde Est AfarC43032.1026647.200132.0019.34382840.080.1314.035.1072.62.511.0205.623.3903.4200.8702.48.55
CFBAfriqueEthiopieSérie stratoïde Est AfarS6038.607146.10040.0011.43261880.050.15188.020.2042.62.311.0204.931.9501.7400.4902.299.93
CFBAfriqueEthiopieSérie stratoïde Est AfarB55432.6021071.800131.005.14631470.010.01121.016.5039.51.840.6603.612.1301.6400.4002.018.46
CFBAfriqueEthiopieSérie stratoïde Est AfarC38236.3010545.00030.0010.34041900.070.17242.020.3044.82.210.9104.521.7802.2500.6102.389.39
CFBAfriqueEthiopieSérie stratoïde centre W Afar Ado AleG50937.7029055.700123.000.63691610.010.03157.015.4036.62.120.8203.621.4200.9800.2702.039.9
CFBAfriqueEthiopieSérie stratoïde centre W Afar Ado AleG50536.1025249.700102.007.73671730.030.08191.015.9035.41.810.8203.421.4601.1300.2802.089.02
CFBAfriqueEthiopieSérie stratoïde centre E Afar C49533.3024053.500169.008.44881900.050.01174.022.4048.62.200.8104.152.2702.0300.6802.239.06
CFBAfriqueEthiopieSérie stratoïde centre AfarC30035.807338.1009.2017.53932970.080.19398.028.2058.42.681.1606.632.3702.7700.7302.439.7
CFBAfriqueEthiopieSérie stratoïdeG45139.5014249.60062.0011.13601650.0090.01151.013.4031.21.970.8203.661.2501.3100.3102.239.42
CFBAfriqueEthiopieSérie stratoïdeGT 9134.3020438.60067.0023.93682640.070.25223.026.4061.67.032.431.0984.095.952.3503.7600.9402.458.83
TypeDomaineZoneLieuMissionMethode, Age, Eruption, CommentaireFichier localisationÉchantillon / SampleScCrCoNiRbSrZrSbCsBaLaCeNdSmEuTbYbHfTaThUWAsMoBrAu (ppb)Ag (ppb)ZnNa (%)Fe (%)Altitude_stratigraphique

Jean-Louis JORON et Michel TREUIL
Laboratoire Pierre Süe
Centre d’Études de Saclay – France
Laboratoire Pierre Sue

Lexique :

  • CAB : calk-alkaline basalt / Basaltes calco-alcalins
  • CFB (Continental Flood Basalt) ou Trapps,
  • MORB : Middle Oceanic Ridge Basalt / Basaltes des rides médio-océaniques
  • OIB : Ocean Island Basalt / Basaltes des îles océaniques intraplaques
  • Subduction : roches issues de zones de subduction, lieu de destruction de la croûte océanique. Lorsqu’une plaque se heurte à une autre plaque, elle retourne dans le manteau en formant une zone de suduction.
  • Volcanisme d’arc insulaire : les arcs insulaires, répartis en bordure des zones de subduction, résultent de la formation de nouvelle croûte similaire à celle des continents
  • Volcanisme arrière-arc : en arrière d'un arc insulaire, formation de petits bassins dits "arrière-arcs". L’ouverture de ces bassins serait le signe précurseur de la formation d’un bassin océanique.
  • Ophiolite : roches correspondant à la lithosphère océanique, charriée sur un continent par obduction lors de la convergence de deux plaques lithosphériques
  • Magmatisme ancien Magmatisme antérieur à la tectonique des plaques actuelle (antérieur à 500 millions d'années)
    • Archéen : éon précédent le Protérozoïque (de - 4 à - 2.5 milliards d’années).
    • Basalte : roche magmatique rapidement refroidie. C'est le constituant principal de la croûte océanique.
    • Protérozoïque : éon (ou période géochronologique) de la fin du précambrien (de - 2,5 à - 0,541 milliards d’années).
    • Komatiite : roches témoins direct du manteau archéen à olivine et pyroxène.
    • Gabbro : roche magmatique, constituant principal de la couche inférieure de la croûte océanique.
    • Ophite : roche magmatique intermédiaire entre le gabbro et le basalte, qui résulte de la cristallisation d'un magma sans contact avec l'atmosphère .
  • Birimien : âge stratigra^phique équivalent à l'époque paléoprotérozoïque du précambrien (-2.5 à -1.6 Milliards d'années).
  • Les roches de cet âge morceau de croûte terrestre (terrane), essentiellement composé de granites alcalins, agrégé à l'aire continentale sud (craton) de l'Afrique de l'Ouest, âgé de
  • Shale : roche sédimentaire n'ayant pas subi de transformation (métamorphisme) et censée représenter la composition de la croûte continentale primitive.
  • Chondrite et achondrite : météorites avec ou sans "chondres", petites billes composées de silicates, traduisant leur origine primitive ou issue d'astéroïdes.
Echelle des temps géologiques du BRGM.

NB : les références des échantillons suivies de "(d)" indiquent de nouvelles analyses sur des échantillons, précédemment analysés.

 

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