THOLEIITE Meaning and
Definition
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Tholeiite is a volcanic rock that belongs to the basaltic composition, characterized by intermediate content of silica (SiO2) and a high content of iron and magnesium oxides. It is typically dark in color, ranging from black to gray, and displays a fine-grained texture.
Tholeiites are formed through eruptions of magma that occurs in rift zones, such as mid-oceanic ridges. This type of magma is derived from the mantle, and it undergoes a relatively low degree of partial melting. As a result, tholeiite is rich in minerals such as olivine, plagioclase feldspar, and pyroxene.
The term "tholeiite" originates from the Greek word "tholei," which means "leaden," referring to its dark appearance. It was first defined by geologists who recognized common characteristics among volcanic rocks found in a specific area in the Isle of Mull, Scotland.
Tholeiite rocks are important in the field of petrology and are used to study Earth's geologic history. By examining the chemical composition of tholeiites, scientists can gain insights into the processes occurring within the Earth's mantle and the evolution of its oceanic crust. Tholeiites also provide valuable information about past plate tectonic activities and volcanic eruptions.
Overall, tholeiite is a type of volcanic rock with specific mineral composition and texture, formed from magma rich in iron and magnesium oxides. Its study contributes to understanding the dynamic processes of Earth's geological activity.
Common Misspellings for THOLEIITE
Etymology of THOLEIITE
The word "tholeiite" has its origins in the Icelandic language. It is derived from the Old Norse word "þóln", which means "plank" or "board". In the context of geology, "tholeiite" refers to a type of basaltic rock characterized by the presence of plagioclase feldspar and clinopyroxene minerals. The term was first introduced by Icelandic geologists in the early 20th century to describe these specific types of volcanic rocks found in Iceland.
