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Lamproite
Lamproites
are
ultrapotassic
mantle
-derived
volcanic
and
subvolcanic rocks
. They have low
CaO
,
Al
2
O
3
,
Na
2
O
, high K
2
O/Al
2
O
3
, a relatively high
MgO
content and extreme enrichment in
incompatible elements
.
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