2023年4月18日 · Basaltic lavas are emitted in effusive (Hawaiian style) eruptions where they either ooze out from vents or are ejected in lava fountains that may be propelled a hundred feet (30 m) or more into the air before landing and starting to flow as molten rock.

Basaltic lavas have low silica (45-52 weight %), are hot (2200°F; 1200°C), and have low viscosity, meaning that they flow easily. Basaltic lava flows may travel many miles (kms) from their vents, and up to hundreds of miles (kms) in the case of extremely large lava flows known as …

2010年5月6日 · There are three types of basalt lava flows: pillow, pahoehoe, and a'a. 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. Image Credit: Gordon Tribble/USGS.

Basaltic lava flows come in two major morphological forms that describe the overall structure and textures of their surfaces and other characteristics: Pāhoehoe – Lava flows with smooth, billowy, or ropy surfaces

2023年11月21日 · Learn about basaltic lava. Understand the composition, characteristics, and morphology of basaltic lava. View examples of basaltic lava flow and basaltic volcanoes. Updated: 11/21/2023....

2024年10月10日 · Basaltic lava, a prevalent volcanic rock on Earth, significantly influences the planet’s surface. Known for its fluidity and relatively low viscosity, basaltic lava contributes to forming new landmasses and shaping geological features.

The low viscosity of basaltic lavas allows them to be extruded over great distances, often producing high-volume lava flows with low aspect ratios (ratio of thickness to area). Under the right conditions, de-gassed felsic magmas can also erupt lava in a nonviolent manner.

Basaltic lava flows erupt primarily from shield volcanoes, fissure systems, scoria cones, and spatter cones. These fluid lava flows can be subdivided into two end-member structural types, based primarily on the nature of lava flow surfaces:

Basalt is a hard, black volcanic rock with less than about 52 weight percent silica (SiO2). Because of basalt's low silica content, it has a low viscosity (resistance to flow). Therefore, basaltic lava can flow quickly and easily move >20 km from a vent.

Other articles where basaltic lava is discussed: lava: … (ferromagnesian, dark-coloured) lavas such as basalt characteristically form flows known by the Hawaiian names pahoehoe and aa (or a’a). Pahoehoe lava flows are characterized by smooth, …