tholeiite


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Related to tholeiite: trachyte

tho·lei·ite

 (tō′lə-īt′, thō′-)
n.
Any of a series of igneous rocks similar in composition to basalt but having more silica and iron and less aluminum.

[After Tholei (Tholey), municipality in Saarland, Germany, where it is found.]

tho′lei·it·ic (-ĭt′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

tholeiite

(ˈθəʊlɪˌaɪt)
n
a type of igneous or volcanic rock found on the ocean floor that is rich in aluminium and similar to basalt
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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The lower part of the WT Complex is mainly composed of amphibolite facies peridotites, oceanic tholeiite, cherts, BIF (banded iron formation), sandstones, shales, calc-silicate rocks, siltstones, and minor limestones [29, 30].
They showed that the mafic volcanic rocks in the inferred younger package are within-plate tholeiite, and attributed them to a backarc basin associated with a volcanic arc of similar age in the Stirling belt of the now-adjacent Avalonian Mira terrane.
The lavas from West Valley are diverse chemically, ranging from alkalipoor olivine-hypersthene tholeiites to near nepheline-normative tholeiite at Southwest Seamount (Fig.
(1989) Geological setting, petrology and geochemistry of Cambrian boninite and low-Ti tholeiite lavas in western Tasmania.
Flood basalt provinces are typically derived from fissure eruptions that produce large volumes of tholeiite over brief time spans, with fluid pahoehoe-type lavas that can flow for great distances (Self et al.
The area lies in the upper extremity of Indian Plate in typical ophiolites mACopyrightlange zone of ocean floor slicing indicated by the presence of green schist as remnant of the pre-existing basalts and tholeiite and subordinate serpentinites of the ocean lithosphere (Haqqani and Ahmaduddin2006).
9f) most mafic rocks from all plutons plot in the continental tholeiite field.
low-K tholeiite olivine clinopyroxene plgeonlte orthopyroxene amphibole biotite magnetite plagioclase alkali feldspar quartz medium-K calc alkaline olivine clinopyroxene plgeonlte orthopyroxene amphibole biotite magnetite plagioclase alkali feldspar quartz high-K calc alkaline olivine clinopyroxene pigeonite orthopyroxene amphibole biotite magnetite plagioclase alkali feldspar quartz Table 2.