| It was more voluminous and ranged petrologically from basalts to picrites, showing very little evidence of continental contamination. |
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| In fact, many of them are petrologically indistinguishable from lavas of similar composition. |
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| However, most other volcanic features in the NE Pacific are poorly understood petrologically. |
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| Careful in situ microsampling of petrologically defined domains is used to isolate material that attained equilibrium at different times. |
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