Following the post-erosional stage this is usually accompanied by violent eruptions of alkali basalt and other more evolved volcanic rocks with high alkali content.
22.
In contrast, alkali basalts have normalized patterns highly enriched in the light REE, and with greater abundances of the REE and of other incompatible elements.
23.
There was a change in composition from tholeiite to alkali basalt over time, something observed in other volcanic centres of the Basin and Range Province as well.
24.
Dependent upon various regional locations, the NAIP is made up of MORB ( Mid Ocean Ridge Basalt ), alkali basalt, tholeiitic basalt, and picrite basalt.
25.
Typically, primitive melts of this composition form lamprophyre, lamproite, kimberlite and sometimes nepheline-bearing mafic rocks such as alkali basalts and essexite gabbros or even carbonatite.
26.
The lavas were initially classified as alkali basalts on the basis of their mineralogy, but subsequent microprobe analyses of glass and pyroxene suggested that they are tholeiitic in origin.
27.
Around 30 million years ago, a tholeiitic, save for a thin layer of alkali basalts and minor amounts of felsic ( high-silica ) volcanic rocks, such as rhyolite.
28.
These form isolated exposures of varying chemistry, indicating a change in magma source from one with a strong influence from earlier subduction to the alkali basalts more normally associated with extensional tectonics.
29.
An alkali basalt lava flow erupted during the Holocene has a volume of and reached a length of along Jom-Bolok river, reaching the Oka river in a large fan and damming it.
30.
The associated lava domes and satellite cones were constructed over the past 7.5 million years during five magmatic cycles beginning with eruption of alkali basalts and ending with felsic and basaltic eruptions as late as 1, 340 years ago.
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