Basalt

There are a total of ten different landscape regions located within the Pacific Northwest. The rocks that are within each region provide the foundation for the landscape within the region. The study of the rock located in the region tells us about the geologic past and provides insight on the materials and processes from which the landscape was formed. I will briefly discuss each of the areas and provide insight on the types of rocks in which they are formed from. We will start with the Basin and Range which is an elongate mountain range that is separated by elongate valleys. This area was formed by alluvial fan which is a cone-shaped fan of sediment deposited by streams and fault-block mountain. The Blue-Wallowa Mountains is located from…

The basalt along the North Shore came from the Mid-Continent Rift. There has been many different basalt lava flows in the North Shore. In Two Harbors, the basalt that would have been on the top of the lava flow is littered with amygdules. An amygdule is just a gas bubble or vesicle that has been filled with minerals. The basalt under the amygdaloidal basalt formed at the bottom of the lava flow because it doesn’t have any amygdules. In Gooseberry Falls, the amygdaloidal basalt is at the…

of one of these rifts exposed in North America after Pangaea separated during the Carnian (Olsen et al., 1992). Today, the valley formations include Pre-Triassic basement, Late-Triassic Sugarloaf Arkose, Early-Jurassic Fall River Beds, Jurassic Deerfield Basalt, Jurassic Turner Falls Sandstone, and Jurassic Mt. Toby Conglomerate. Observations Stop 1, located on Rt. 2 West at the Longview Gift Shop, the Gile Mountain Formation is exposed alongside the road. The Devonian Gile Mountain Formation…

Petrography of host rocks The Venarch manganese deposit is accommodated by volcanic and plutonic rocks. The volcanic strata mainly consist of basalt, trachybasalt, andesite, and basaltic andesite which are intruded by monzonite, monzodiorite, granodiorite, and syenite. The plutonic rocks are mostly granular in texture; however other textures such as graphic and poikilitic textures are present. The dominant minerals are plagioclase phenocrysts, quartz, K-feldspar, and hornblende and accessory…

eruption lasted until 3 July the same year. Townspeople constantly sprayed the lava with cold seawater, causing some of it to solidify and much to be diverted, thus saving the harbor from destruction. The people were elated that their livelihoods remained intact, even though much of their town had been destroyed. During the eruption, half of the town was crushed and the island expanded in length. The eruption increased the area of Heimaey from about 11.2 km² to about 13.44 km².” The Mid-Atlantic…

Bandera. This means, knowing the volcanoes erupted closely in the last 5 Ma, so the last Zuni- Bandera could follow another one soon on the Lineament line. In the Rio Grande Rift there has been a mixture of younger and older volcanoes. The younger volcanoes being the Jornado volcanic field in 760 ma, Albuquerque Volcanoes in 165 ka, Cerros del Rio in 2.9 - 2.3ma, and Taos Plateau in 4.8 - 2.8 Ma. These are some of the volcanoes that is located in the Rio Grande Rift also indicting that this area…

Introduction Adakites are volcanic rocks that are diagnostic of high temperature, high pressure conditions, (Stevenson, 2005). Their composition ranges from felsic to intermediate, and are characterized by assemblages of plagioclase, and often amphibole, and are identified by their unique geochemical signatures. Adakite is named Adak Island, Alaska, where it was first documented,(Defant and Drummond, 1990). They are often formed through the partial melting of a young subducting slab of…

in Europe and one of the world's most frequently erupting volcanoes.” (Mount Etna: Facts) Mount Etna’s earliest known eruption was in 6190 BCE. The second known eruption was in 5150 BCE. These eruptions are known because of radiocarbon found in the area. The date of when this volcano was formed is not certain like most volcanos this one was formed on plate boundaries. Mount Etna is called a Stratovolcano. A Stratovolcano is made from layers of ash and lava. Another name for this volcano is a…

Lava wasn’t always called “lava” it wasn’t till 1737 after the Mount Vesuvius eruption that it got its name. Reason being that it got its name is because it oozes from the sides of the volcano which in Latin its root word means to fall or ooze. There is a difference between magma and its close brother lava. Magma is liquid rock that is still inside the earth and has yet to come out. Lava on the other hand is magma that is no longer inside the earth. The most common type of liquid rock outside…

and conflicts. Ones confidence and understanding of freedom improves with this stone. Greywacke is a type of sandstone that is hard, dull, and dark grey. It is made up of a mixture of quartz, feldspar, and rock particles. These grains are not equally distributed, and when looking at greywacke with a magnifying glass, they are angular and different sizes. It makes up 95% of New Zealand’s rocks, and it is thought of as the country's national stone. Greywacke is used for concrete, erosion…