Contoh basalt

• This lends support to a controlling influence for lithospheric rifting zones on continental flood basalt generation and emplacement.

• We have undertaken three independent field tests to determine whether the magnetization of the andesite and basalt sheets is primary.

• These conglomerates are composed of clasts of basalt, volcaniclastic sandstone, alkaline lava and sub-rounded chert.

• From about 128 km away, they hauled huge basalt boulders, from which to carve colossal heads, and nearly 100 other sculptures.

• This is corroborated by the rather similar isotopic compositions of the alkali basalts and trachytes.

• The combined effects of less erosion-resistant marly limestone and the columnar jointing of basalts caused the rapid migration of the knickpoint toward the upstream reach.

• Soils are coarse inceptisols originating from 2-3 m of volcanic ash over basalt bedrock.

• Mineral beads were added in order to reveal a possible influence of basalt and limonite on the molecular stability and formation of the derivatives.

• The basalts have distinctive petrographic characteristics such as rounded and skeletal olivine phenocrysts with abundant melt inclusions, implying the mixing of two distinct magmas.

• The rapid incision can be attributed to the adequacy of discharge under the prevailing warm and humid climate conditions after basalt extrusion.

• The levels of elephant utilization and tree pushing were also determined for the four main geological substrates, basalt, granite, rhyolite and gabbros.

• The breccia contains a variety of boulders, dominated by vesicular basalt and phonolitic lavas.

• Unweathered basalt minerals such as olivine and pyroxene contain high amounts of reduced iron that microbes can scavenge.

• These two tuffs could have had the same parental magmas than the other tuffs and associated basalts.

• Plucking may effectively erode the welljointed thick basalt bed, resulting in boulders the size of which depends on the bedding and joints of the basalts.