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65 m.y, long magmatic activity in Sumatra

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TABLE l. - dance d'ichanti Geochemical analyses of select€d lavas fmm Suftaaa (oxide veight 70 for ,rajor clehents, ppm for tiace el€h€nts)
TABLE IL - l$otopic 4 -{Ar datings of samples fiom Sumat a. Ages with erors at one sigma level sr€ calculated with Steig€
FIG. 4. - de Sun et McDonough [1989] de roches FtG. 4. rocks normalis€d to the Primitive Mantle ofSun and lnpompatible llultielement plots of seleeted Suaatra magmrticMcDonough I9891.- Diagramtnes hultiAlihenlaira nor,ralkis at1 mantear primitifmagnatiques sAlectionnees de Su-

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