I understand, that melts of ultamafic and alkali lammprophyres must be lower, than kimberlitic speed, because the number of xenoliths and xenocrysts is lower compared to kimberlites. But i couldn't find any numerical estimates for lamprophyric melts.
DEAR DR. VOZNYAK
GOOD AFTERNOON. THE ACCENT SPEED OF KIMBERLITES VARRIES FROM 60KM/HR TO 1440 KM/HR IN THE MORE VOLATILE-RICH KIMBERLITES. AS I UNDERSTAND IT, THE MORE ANGULAR XENOLITHS WE HAVE THE MORE THE INTERNAL FRICTION, THE SLOWER THE MAGMA. ULTRAMAFIC AND ALKALINE LAMPROPHYRES GENERALLY HAVE LESS XENOLTHS THAN KIMBERLITES. THEREFORE ONE MIGHT EXPECT EVEN HIGHER SPEEDS.
BEST REGARDS
IOANNIS KAMVISIS
ONE MUST ALSO NOTE THAT KIMBERLITES FREQUENTLY APPEAR AS WIDE DIATREMES AT LEAST 100 M ACROSS, WHILE ULTRAMAFIC AND ALKALINE LAMPROPHYRES GENERALLY APPEAR AS NARROW DIKES 0,5 M ACROSS. THIS MEANS THAT IF WE HAVE THE SAME AMOUNT OF MAGMA WITH THE SAME VISCOSITY TRAVELLING UPWARDS, THEN THE LAMPROPHYRES WOULD TRAVEL FASTER DUE TO THE BERNOULLI EFFECT.
BEST REGARDS
IOANNIS