Portuguese term (edited): derrame bas�ltico tole�tico

Esta é a grafia correcta - tholeiite / tholeiitic

Tholeiite: basalt composed of calcic plagioclase, augite-pigeonite or hypersthene and few or without olivine. Tholeiitic basalts occur in mid-ocean ridges, island arcs and huge intra-continental basalts plateaus.

http://perso.wanadoo.fr/jacques.delfour/glossre.htm#T

tholeiite -- Encyclopædia Britannica
tholeiite fine-grained extrusive igneous rock, a basalt that contains ...
Tholeiite occurs as extensive plateaus (volumes on the order of 200000 to 800000 ...
www.britannica.com/eb/article-9072156

[PDF] Basaltic and Gabbroic Rocks
File Format: PDF/Adobe Acrobat - View as HTML
Tholeiite (dominant) + Alkali Basalt + Hawaiite + Mugearite + Trachyte. Tahiti.
Alk. Basalt + Mugearite + Hawaiite + Trachyte. Galapagos. Tholeiite + Alk. ...
www.tulane.edu/~sanelson/ eens212/basaltic&gabbroicrocks.pdf

Basaltic & Gabbroic Rocks
... where there has been a large outpouring of basalts on the oceanic ridge, ...
This alkaline volcanism occurs on top of the tholeiitic basalts and erupts ...
www.tulane.edu/~sanelson/ eens212/basaltic&gabbroicrocks.htm

--------------------------------------------------
Note added at 1 hr 4 mins (2005-08-15 03:48:45 GMT)
--------------------------------------------------

Além das referências apresentadas, posso dizer que sou geólogo há 30 anos.