zone = France
Données géochimiques des échantillons de type "Magmatisme ancien" du domaine "Europe" dans la zone "France" :
| Centre
Paris-Saclay
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Univ. Paris-Saclay

Données géochimiques des échantillons de type "Magmatisme ancien" du domaine "Europe" dans la zone "France" :



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 (%)
Magmatisme ancienEuropeFranceLimousin (Corrèze)Route de SGraniteTJ96.80858.4045.6203.0004922620.178.132770.7142.354.9.241.680.6691.17.1101.27130.05.8126.91.11112.822.78
Magmatisme ancienEuropeFranceLimousin (Corrèze)St MexanGraniteTJ163.80183.8012.469.9007581700.836.4123933.563.323.3.680.930.2950.84.8000.56911.92.140.42.150.30.3453.71.25
Magmatisme ancienEuropeFranceLimousin (Corrèze)St MexanGraniteTJ16 (d)3.96183.9112.472.2007631920.836.6128135.066.921.3.7710.3090.94.8200.61013.52.62.220.10.2443.521.31
Magmatisme ancienEuropeFranceLimousin (Corrèze)La Roche sGraniteTJ186.80143.7013.2131.000802470.154.573532.977.537.8.561.091.2753.77.2101.09312.02.63.850.70.4732.651.99
Magmatisme ancienEuropeFranceLimousin (Corrèze)Face à CorGraniteTJ266.10186.2013.1102.00011692040.0633.6155348.592.6314.611.320.3410.95.1100.85116.23.910.22.160.50.8523.622.03
Magmatisme ancienEuropeFranceLimousin (Corrèze)Face à CorGraniteTJ26 (d)6.30206.4512.5105.00011962140.0783.7162044.398.3304.711.520.3711.05.3400.94417.53.932.140.40.7503.042.09
Magmatisme ancienEuropeFranceLimousin (Corrèze)Pont de NeGraniteTJ103.50223.519.6289.0001182350.129.051650.9122.948.10.61.020.8150.96.7000.87134.88.670.62.481.10.30.488832.41.4
Magmatisme ancienEuropeFranceLimousin (Corrèze)EstivauxGraniteTJ194.50313.9823.6173.0004941650.0855.381730.262.825.5.061.220.4291.04.7600.64814.1911.00.20.3583.431.25
Magmatisme ancienEuropeFranceLimousin (Corrèze) Mérignac GraniteTJ113.20142.439.0214.0001761690.0479.966539.00.05.040.0004.3101.08620.87.322.711.17
Magmatisme ancienEuropeFranceLimousin (Corrèze) Mérignac GraniteTJ11 (d)3.33112.619.6222.0001801880.05410.369142.787.232.5.110.950.3520.64.7201.17022.97.841.370.7255542.861.23
Magmatisme ancienEuropeFranceLimousin (Corrèze)Mérignac (GraniteTJ123.20162.0316.2315.0001191680.06418.443135.575.329.4.870.770.4770.64.2902.44715.416.62.21.591.83.00.8136602.281.19
Magmatisme ancienEuropeFranceLimousin (Corrèze)ChauzeixGraniteTJ142.2080.908.1443.000651250.05427.830618.346.518.4.510.790.5151.23.7103.4609.7712.73.63.261.10.40.4105662.20.78
Magmatisme ancienEuropeFranceLimousin (Corrèze)Peyrissac GraniteTJ62.20111.598.5289.0001401020.04617.143621.245.319.3.730.70.3770.73.0102.6418.755.871.31.450.50.20.8100443.650.83
Magmatisme ancienEuropeFranceLimousin (Corrèze)Chaumeil (GraniteTJ13a2.0061.704.8271.000711240.1614.328519.244.218.4.170.590.4540.53.4802.5047.69.081.68.340.94.9419690.65
Magmatisme ancienEuropeFranceLimousin (Corrèze)Chaumeil (GraniteTJ131.6071.036.6237.00069840.05618.224615.435.013.3.710.510.5030.62.7401.8056.435.371.62.30.40.40.681582.920.64
Magmatisme ancienEuropeFranceLimousin (Corrèze)Chaumeil (GraniteTJ13 (d)1.6751.095.5245.000711000.05619.025814.433.112.3.340.510.5050.62.8201.8705.956.231.52.280.50.4543.040.66
Magmatisme ancienEuropeFranceLimousin (Corrèze)LafargeGraniteTJ15b2.80132.704.9508.000791260.01640.634628.764.429.4.871.290.4130.93.9704.91014.89.743.12.451.51.31.01182.841.11
Magmatisme ancienEuropeFranceLimousin (Corrèze)Les FerrièAmphiboliteTJ141.3062455.20242.05.4003481760.150.211311.629.917.4.921.730.8343.14.0500.8981.080.670.42.660.80.3842.367.4
Magmatisme ancienEuropeFranceLimousin (Corrèze)SeilhacAmphiboliteTJ335.6037939.9045.217.8002021520.442.12419.625.716.4.931.520.8713.54.0600.4462.170.953.142.12.50.51281262.56.93
Magmatisme ancienEuropeFranceLimousin (Corrèze)Uzerches AmphiboliteFront A47.805446.0040.78.1003371820.320.411713.133.022.6.032.261.0103.44.5100.9401.260.351.220.80.31232.268.8
Magmatisme ancienEuropeFranceLimousin (Corrèze)Uzerches AmphiboliteFront B45.504744.4038.66.9004061600.340.37312.231.416.5.512.10.9403.44.5400.9901.10.312.641.80.21012.438.4
Magmatisme ancienEuropeFranceLimousin (Corrèze)Uzerches AmphiboliteFront C45.608740.1019.19.5002121110.30.4827.921.214.4.341.730.8003.13.3200.4201.070.421.361.01062.568.41
Magmatisme ancienEuropeFranceLimousin (Corrèze)Uzerches AmphiboliteFront D44.701341.9041.34.8004032220.310.218417.840.822.6.092.240.9703.25.1501.6002.160.812.251.9953.028.43
Magmatisme ancienEuropeFranceLimousin (Corrèze)Uzerches AmphiboliteFront E39.7011634.5047.43.2003281340.320.2416.718.613.4.131.660.7802.93.3900.4600.530.261.230.9872.376.67
Magmatisme ancienEuropeFranceLimousin (Corrèze)Uzerches AmphiboliteFront F42.101941.3030.57.1504261920.2850.421116.738.719.5.712.190.9403.24.7401.4201.980.851.51.00.1892.847.04
Magmatisme ancienEuropeFranceMontagne NoireSalsigne -Roc SoufratRS138.109684.0092.0217.00012731436.130.2133824.062.07.11.50.9002.79.2006.30017.77.26.546.30.486.69
Magmatisme ancienEuropeFranceMontagne NoireSalsigne -Roc SoufratRS235.009054.30105.0222.00049339437.333.2142756.9132.09.72.71.1304.19.3006.54018.96.35.228.80.475.75
Magmatisme ancienEuropeFranceMontagne NoireSalsigne -Roc SoufratRS340.007895.5080.0223.00044741732.630.4163649.592.08.12.30.9603.78.8006.80022.364.927.90.317.11
Magmatisme ancienEuropeFranceMontagne NoireSalsigne -Roc SoufratSou1a33.207495.5091.0119.00045124221.916.354023.349.961.70.7102.35.2003.54012.74.34.15
Magmatisme ancienEuropeFranceMontagne NoireSalsigne -Roc SoufratSou233.508224.6046.0186.0003563824.2281882.8174.0102.70.86038.2006.35019.42.640.12.2310.6
Magmatisme ancienEuropeFranceMontagne NoireSalsigne -Roc SoufratSou540.208197.7052.0175.00046533.123.43169107.0236.011.82.70.91038.6006.34019.52.61.7711.6
Magmatisme ancienEuropeFranceMontagne NoireSalsigne -Roc SoufratSou631.206479.40116.0137.00028825524.818.066652.8106.08.42.20.9202.45.4003.97012.53.95.10.353.52
Magmatisme ancienEuropeFranceMontagne NoireSalsigne -Roc SoufratSouSp24.202738.4064.027.4005111467.53.524817.042.24.71.450.5401.12.1001.38010.33.10.320.3115.4
Magmatisme ancienEuropeFranceMontagne NoireSalsigne -La JourdaneJou134.9079026.8038.0194.00010829720.315.1169452.0167.07.82.80.9702.68.0006.44019.42.49.50.276.54
Magmatisme ancienEuropeFranceMontagne NoireSalsigne -La JourdaneJou342.5011478.4034.0183.00042213.614.4204567.2142.010.72.20.9903.19.2006.64020.64.729.6.80.277.69
Magmatisme ancienEuropeFranceMontagne NoireLabécèdeLe ColombierC44A24.0020247.80159.06.5001090550.623.6653.07.01.90.740.4001.4000.1400.270.070.92.837.14
Magmatisme ancienEuropeFranceMontagne NoireLabécèdeLe ColombierC44B24.409950.00152.012.500919500.486.21102.96.81.90.850.4001.3400.1300.250.082.81752.747.80
Magmatisme ancienEuropeFranceMontagne NoireLabécèdeLe ColombierC4528.1033450.90262.021.6001475310.6616.11991.93.91.50.750.3301.60.9300.1000.22962.217.20
Magmatisme ancienEuropeFranceMontagne NoireLabécèdeVilleuragneV438.1025443.30104.074.000643740.3323.521133.39.52.40.950.5402.42.0000.1600.390.188.52.118.22
Magmatisme ancienEuropeFranceMontagne NoireLabécèdeVilleuragneV12A32.3029946.10190.018.0001632680.466.85873.610.82.10.860.4502.71.5000.1500.610.1334.72.997.46
Magmatisme ancienEuropeFranceMontagne NoireLabécèdeVilleuragneV12B34.7030748.50194.034.4001485800.3714.610082.97.61.80.80.45031.5000.1400.630.1324.12.997.60
Magmatisme ancienEuropeFranceMontagne NoireLacauneRivayrollesRiv1 (DB14)23.0023728.9094.057.900476662.112.05287.813.32.30.740.4001.62.0000.1502.20.413.644.66
Magmatisme ancienEuropeFranceMontagne NoireLacauneRivayrollesRiv2 (DB15)19.9017925.6074.044.8003941071.64.34899.821.12.90.960.5502.52.2000.1702.70.524.63.664.50
Magmatisme ancienEuropeFranceMontagne NoireLacauneSagnes Sag1 (DB9)28.4031933.00115.09.900698620.930.5703.88.02.40.720.5702.91.6700.1100.680.1514.045.69
Magmatisme ancienEuropeFranceMontagne NoireLacauneSagnes Sag3 (DB11)27.4036138.00146.016.300851500.551.41384.08.22.10.840.4001.81.8000.1000.670.211.93.275.65
Magmatisme ancienEuropeFranceMontagne NoireLacauneVianesVia1 (IB154)38.7038140.20163.029.4001131411.60.75981.84.01.70.740.3801.71.1000.0450.270.13.72.206.08
Magmatisme ancienEuropeFranceMontagne NoireLacauneSaussonièresSau1 (IB51)33.8028333.30162.011.1001140511.90.35861.83.81.91.20.4401.81.3000.0300.210.068.913.246.41
Magmatisme ancienEuropeFranceMontagne NoireLacauneSaussonièresSau2 (IB52)38.2032934.80179.07.600960432.80.23211.74.01.90.790.44021.4000.0360.260.2514.21.12.966.97
Magmatisme ancienEuropeFranceMontagne NoireLacauneLa GraveGra1 (DB6)13.301117.3010.053.3003621170.354.334410.019.52.60.70.4001.83.4000.4204.20.9825.264.58
Magmatisme ancienEuropeFranceMontagne NoireLacauneLa GraveGra2 (DB7)14.10611.509.044.3002261300.262.729114.031.83.30.910.5002.23.7000.4604.51.12.25.783.81
Magmatisme ancienEuropeFranceMontagne NoireLacauneLa GraveGra5 (DB8)14.001118.2013.033.5002451170.631.638016.927.63.60.780.4901.93.1000.3803.70.95.51.84.994.38
Magmatisme ancienEuropeFranceMontagne NoireLacauneLa GraveSag2 (DB10)13.401811.7014.025.8002841150.511.120211.521.42.30.460.3301.73.5000.3903.11.3321.15.244.97
Magmatisme ancienEuropeFranceMontagne NoireLacauneMontaigutMon2 (DB12)15.401216.3017.011.0002881050.670.511711.422.02.40.840.3202.13.2000.38031.342.31.45.685.12
Magmatisme ancienEuropeFranceMontagne NoireLacauneMontaigutMon3 (DB13)14.501815.8014.04.7002441200.810.391.59.515.11.80.440.3001.43.0200.4003.41.347.81.73265.674.92
Magmatisme ancienEuropeFranceMontagne NoireLacauneVernèdeVer 1(DB16)15.002015.5013.06.500185950.470.49814.622.83.30.860.4702.13.0000.3302.50.974.22.45.654.76
Magmatisme ancienEuropeFranceMontagne NoireLacauneVeyrièVey110.70307.9011.039.5006201030.192.725211.225.52.80.660.3601.62.7000.4104.42.83.80.73.182.06
Magmatisme ancienEuropeFranceMontagne NoireLacauneViéVié2 (DB1)21.8098033.10139.0253.0004423616.98.112533.881.04.70.820.3101.25.1000.69017.632.81230.2415.2
Magmatisme ancienEuropeFranceMontagne NoireLacauneViéVié3 (DB2)30.201355108.00433.0283.0003116.69.86844.40.00.690.490.0940.51.7400.0360.463.94.13721.42720.317.39
Magmatisme ancienEuropeFranceMontagne NoireLacauneViéVié4 (DB3)26.50106436.50449.097.0003611914610.383735.375.02.30.4201.44.8000.62017.27.12921.694.77
Magmatisme ancienEuropeFranceMontagne NoireLacauneViéVié5 (DB5)16.30122648.60540.0246.0004414015412.168.540.777.05.50.3200.44.7000.640154.41681.664.16
Magmatisme ancienEuropeFranceMontagne NoireLacauneViéVié6 (DB4)17.80114525.50256.072.0003328158.15.221386.5153.010.31.880.7401.96.9001.01029.15.817.1181.052.33
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB18439.6036355.00203.013.9002850.0610.11.75.82.10.880.5102.41.6000.0440.190.0522.866.64
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB19636.0029948.20193.026.600556470.113.51081.12.71.90.590.4602.71.4000.0400.130.114.116.08
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB10430.902531.3021.016.7003311080.263.82734.09.02.51.020.5002.82.0000.0880.670.172.20.63.885.44
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB222A30.1020442.2062.011.200245520.41.4841.54.51.50.370.3301.71.5500.0550.510.131.95.074.59
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB222B29.3019226.9057.03.100259680.850.6401.85.61.40.40.2901.51.6000.0590.590.182.45.733.64
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB99B36.0019032.4052.02.200657721.60.535.43.912.12.30.970.53031.9000.0910.580.063.44.276.01
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB11620.3037958.20266.08.600641.31.079.80.51.41.70.470.4903.31.7400.0530.150.0511.24.597.50
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB12031.6037139.30143.015.000762661.21.52749.727.02.90.90.4402.42.0000.1101.470.341.12.775.39
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB14432.0026747.80328.07.8003331020.630.71435.512.03.41.020.6203.92.8000.1701.250.271.81.55.174.94
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB15133.1038730.70644.012.00019359711.72.1185.914.03.11.090.6602.72.4000.1501.80.430.866.72
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB15817.707021.3035.027.3008121037.81.87387.416.12.40.740.3402.52.6000.1302.30.5241.12.893.98
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB16015.905524.6032.0103.000194651.711.62603.99.01.450.410.2300.72.0000.1001.690.453.233.63
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB18730.5037248.70200.019.600478960.655.2973.37.52.30.720.5002.92.0000.1401.120.25114.175.50
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB19329.9029131.70218.09.8005605113.31.2921.04.01.80.650.4301.81.3400.0350.170.173.794.78
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB22040.4032648.10192.049.900371461.44.42441.45.02.20.90.5503.11.5400.0460.180.11.13.477.81
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB22134.2027747.40194.040.9007195146.1861.34.11.90.740.4402.51.2000.0400.20.071.91.23.366.19
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB10513.903815.9039.02.3001001220.470.446.68.722.72.910.5202.83.4000.2103.350.333.41.27.403.90
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB1118.70234.105.01.40024960.540.229.45.112.01.90.530.3001.72.9000.1702.40.473.61556.871.67
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB11210.60235.407.0167.000501428.58.182511.929.02.750.610.4502.54.1000.2503.30.412.753.63
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB1247.60109.1010.046.1008420123.91647.919.72.70.830.4101.73.5000.2403.40.792.55.021.93
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB14513.6010317.30429.09.8001521.051.31056.214.62.10.420.3302.74.1000.2603.80.791.32.56.913.39
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB14716.105116.30312.023.60053013621.64639.823.73.10.840.5002.73.4000.21030.761.60.55.454.38
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB15217.9015412.50578.020.5001461.81.552727.254.161.440.9602.63.7000.2303.50.521.42.27.043.83
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB18015.901915.309.015.0001631301.50.73319.923.42.60.670.4402.13.1000.1902.90.862.852066.221.49
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB1088.30213.206.06.8003832222.60.435.213.637.24.30.750.8105.56.9000.5008.21.52.21.55.531.78
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB12215.7012318.0072.06.3003911180.820.759.37.618.42.50.720.4001.82.7000.1602.30.573.12.15.263.39
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB1627.30113.704.67.0004501602.30.845.413.533.04.20.820.71044.3000.3004.61.33.40.654.591.71
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( EnsègesB16818.404220.5031.045.500388811.74.51809.120.42.50.850.3401.52.5000.1402.40.420.180.33.954.50
Magmatisme ancienEuropeFranceMontagne NoireBrusque ( RocozelsRO11.90110.339.0142.00018863.22.0517117.835.83.20.610.6303.0001.1608.61.36.48.813960.190.18
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TypeDomaineZoneLieuMissionMethode, Age, Eruption, CommentaireFichier localisationÉchantillon / SampleScCrCoNiRbSrZrSbCsBaLaCeNdSmEuTbYbHfTaThUWAsMoBrAu (ppb)Ag (ppb)ZnNa (%)Fe (%)

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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