types of basalts

  • What are the different types of basaltic lava flows and

    There are three types of basalt lava flows pillow pahoehoe and a'a Pillow lava Pillow lavas are volumetrically the most abundant type because they are erupted at mid ocean ridges and because they make up the submarine portion of seamounts and large

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  • Basalt University of Auckland

    Basalt Basalt is a mafic extrusive rock is the most widespread of all igneous rocks and comprises more than 90% of all volcanic rocks Because of its relatively low silica content basalt lava has a comparatively low viscosity and forms thin flows that can travel long distanc

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  • What Is Basalt? thoughtco

    If the basalts rise beneath a continent they most often mix with less mafic (that is more felsic) continental rocks and yield different sorts of lavas ranging from andesite to rhyolite But under favorable circumstances basalts can coexist with these felsic melts and erupt among them for instance in the Great Basin of the western United Stat

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  • Flood Basalts | Volcano World | Oregon State University

    Flood basalts are yet another strange type of "volcano" Some parts of the world are covered by thousands of square kilometers of thick basalt lava flows individual flows may be more than 50 meters thick and individual flows extend for hundreds of kilometers

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  • Basalt Facts for Kids Kiddle encyclopedia

    Basalt is one of the most common rock types in the world Basalt is the rock most typical of large igneous provincThe largest occurrences of basalt are in the ocean floor that is almost completely made up by basalt Above sea level basalt is common in hotspot islands and around volcanic arcs specially those on thin crustHowever the largest volumes of basalt on land correspond to

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  • GEOL205 Petrology University of Hawaii at Hilo

    Petrology The different types of magmas GEOL205 Lecture Not All of the Earth's ocean basins are made up of a special kind of volcanic rock called "basalt" Basalt first erupts as molten lava from fissures along the mid ocean ridge system but rapidly cools to form new ocean crust

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  • Lunar Rocks | National Air and Space Museum

    Lunar surface basalts are believed to have their origins in partially melted areas 100 400 kilometers (60 250 miles) beneath the large meteoroid impact basins The basaltic material welled up into the basins through cracks created by the impacts The basalt flows covered areas up to 1200 kilometers (750 miles) away from where they had arisen

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  • basalt | Definition Properties & Facts | Britannica

    Basalt extrusive igneous (volcanic) rock that is low in silica content dark in color and comparatively rich in iron and magnesium Basalts may be broadly classified on a chemical and petrographic basis into two main groups the tholeiitic and the alkali basalts Learn more about basalt in this article

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  • Basalt Rocks Windows to the Universe

    Basalt is an extrusive igneous rock that is very dark in color It is the most common type of rock in the Earth's crust and it makes up most of the ocean floor It is made of many dark colored minerals such as pyroxene and olivineBasalt also contains some light colored minerals such as feldspar and quartz but the amounts are small

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  • Petrographic Characterization of the Different Types of

    the different types of basalts of harrat Al Fatih area southwest of Ablah area The study also aims to describe the geologic events of the study area during the eruption of these basic volcanics 13 Materials and Methods In the initial stage of the study the regional and detailed satellite images and

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  • What are the different types of lava flows and how do they

    Feb 27 2009· There are three types of basalt lava flows pillow pahoehoe and aa Pillow Lava Pillow lavas are volumetrically the most abundant type because they are erupted at mid ocean ridges and because they make up the submarine portion of seamounts and large intraplate volcanoes like the Hawaii Emperor seamount chain Eruptions under water or ice make pillow lava

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  • Plateau Formation & Types of Plateaus | Major Plateaus of

    Dec 30 2015· A third type of plateau can form where extensive lava flows (called flood basalts or traps) and volcanic ash bury preexisting terrain as exemplified by the Columbia Plateau in the northwestern United States Deccan Traps of peninsular India Laurentian plateau or The Canadian Shield and the Siberian Traps of Russia

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  • Apollo 11 Lunar Sample Overview lpiusraedu

    Two main types of rocks basalts and breccias were found at the Apollo 11 landing site Basalts are rocks solidified from molten lava On Earth basalts are a common type of volcanic rock and are found in places such as Hawai'i Basalts are generally dark gray in color; when one looks at the Moon in the night sky the dark areas are basalt

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  • Petrotectonics of Tholeiitic and Alkaline Basalts

    Alkaline Basalts Alkali basalts are non tholeiitic basalts produced from small degree (<5%) melting of mantle rocks resulting in readily melted source rock having a higher concentration in alkali basalt than tholeiite (Foulger GE 2010) Although alkali basalts are less voluminous than tholeiites it is the composition of most

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  • Basalt Meteorite Information

    Basalts come in a wide variety of textures and colors Some have vesicles (gas bubbles) some don't Some are gray others are reddish or even greenish Basalt is one of the most common rock types on Earth Except for the coral nearly all of the rocks of Hawaii are basalts Much of Oregon and Idaho is covered with basalt

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  • Use basalts in a sentence | basalts sentence examples

    The two leading types of volcanic areas are the plateaus in which sheets of porphyrites basalts and even trachytes were emitted sometimes with wide discharge of volcanic ashes and the puys or isolated vents or scattered groups of vents which discharged comparatively a small amount of lava and ash

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  • geochemistry What is the difference between N MORB E

    What are the differences between N MORB E MORB and OIB with regards to Tectonic setting Geochemical features There are several types of basalts but I can't find a clearly explained article

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  • Flood Basalts Michigan Technological University

    Flood Basalts are high volume eruptions that flood vast areas of the Earth covering broad regions with flat lying lava surfac They are said to be the result of mantle convection through hot spots which occur sporadically in time and placeIn the USA we are familar with the Columbia River Flood basalts which represent hundreds of black basalt lava layers which cover eastern Washington and

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  • USGS Volcano Hazards Program Glossary Basalt

    Basalt is the most common rock type in the Earth's crust (the outer 10 to 50 km) In fact most of the ocean floor is made of basalt Huge outpourings of lava called "flood basalts" are found on many continents The Columbia River basalts erupted 15 to 17 million years ago cover most of southeastern Washington and regions of adjacent Oregon

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  • Flood basalt | geology | Britannica

    Other articles where Flood basalt is discussed plateau Formative processes lava flows (called flood basalts or traps) and volcanic ash bury preexisting terrain as exemplified by the Columbia Plateau in the northwestern United Stat The volcanism involved in such situations is commonly associated with hot spots The lavas and ash are generally carried long distances from their sources

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  • Basalt Rocks Windows to the Universe

    Basalt is an extrusive igneous rock that is very dark in color It is the most common type of rock in the Earth's crust and it makes up most of the ocean floor It is made of many dark colored minerals such as pyroxene and olivineBasalt also contains some light colored minerals such as feldspar and quartz but the amounts are small

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  • What Are the Uses of Basalt Rock? | Reference

    The word "basalt" is derived from the Latin word "basalts " which loosely translates to "very hard stone" Depending on the thickness and the location lava flow may take days or months to completely cool Basalt rock is Earth's most abundant bedrock forming a

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  • Basalts basalt series and basalt classification Basalt

    Basalts basalt series and basalt classification Basalt in the generic sense = plagioclase + clinopyroxene +/ (olivine nepheline hypersthene quartz melilite magnetite) The basalt tetrahedron is a useful tool for classifying basalts The tetrahedron is constructed using the normative components olivine quartz clinopyroxene and nepheline

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  • Basics Volcanoes

    The composition gas content and crystal content of the magma determines the type of eruption that occurs the kind of volcanic rock that forms and the type of volcano that forms Shield Volcano Lava flow after lava flow of low viscosity mafic lava builds up a basaltic shield volcano Shield volcanoes are the largest type of volcano on

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  • Flood Basalts | Volcano World | Oregon State University

    Flood basalts are yet another strange type of "volcano" Some parts of the world are covered by thousands of square kilometers of thick basalt lava flows individual flows may be more than 50 meters thick and individual flows extend for hundreds of kilometers

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