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tholeiite
(redirected from Tholeiitic basalt)

   Also found in: Encyclopedia, Wikipedia 0.01 sec.
tholeiite  (tl-t)
Any of a series of igneous rocks that are similar in composition to basalt, but are richer in silica and iron and poorer in aluminum than basalt is. Tholeiites form especially at mid-ocean ridges and in continental rift areas.


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Arc-related calc-alkalic and tholeiitic basalts typically show moderate degrees of light rare-earth-element (LREE) enrichment, and flat heavy rare-earth-element (HREE) profiles, indicating an origin in a shallow (spinel lherzolite) mantle.
Gold occurs as free gold in quartz veining and stock works in altered ultra mafics and in gold associated with pyrite in altered tholeiitic basalts.
74 Ga--deposition of sequences of tholeiitic basalt, komatiite, felsic turf, iron formation, and abundant clastic sedimentary rocks, accompanied by the emplacement of voluminous, synvolcanic tonalite-trondhjemite plutonic suites and coeval deformation.
 
 
 
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