Dike (geology) - Wikipedia
网页Dikes range in composition from basaltic to rhyolitic, but most are basaltic. The texture is typically slightly coarser than basalt erupted at the surface, forming a rock type called diabase. The grain size varies systematically across the dike, with the coarsest grains normally at the center of the dike. [12]
Dike | Volcanic, Intrusive & Magma | Britannica - Encyclopedia Britannica
网页dike, in geology, tabular or sheetlike igneous body that is often oriented vertically or steeply inclined to the bedding of preexisting intruded rocks; similar bodies oriented parallel to the bedding of the enclosing rocks are called sills. A dike set is composed of several parallel dikes; when the number of dikes is large, the term dike swarm ...
Basalt: Igneous Rock - Pictures, Definition, Uses & More - Geology.com
网页Basalt is a dark-colored, fine-grained, igneous rock composed mainly of plagioclase and pyroxene minerals. It most commonly forms as an extrusive rock, such as a lava flow, but can also form in small intrusive bodies, such as an igneous dike or a thin sill. It has a composition similar to gabbro.
Intrusive Basalt Dike “Acadia National Park” - Geology Page
网页March 11, 2019. Students examining a 3m wide intrusive basalt dike at Acadia National Park in Maine, USA. Credit: Zack Churchill. What is an intrusive igneous rock? Intrusive, or plutonic, igneous rock forms when magma remains inside the Earth’s crust where it cools and solidifies in chambers within pre-existing rock.
Igneous and Volcanic Rock Features - Geology.com
网页Basalt is an example of an extrusive igneous rock formed from dark-colored lava. Rhyolite is an example of an extrusive igneous rock formed from light-colored lava.
4.1: Classification of Igneous Rocks - Geosciences LibreTexts
网页Basalt and gabbro are the extrusive and intrusive names for mafic igneous rocks, and peridotite is ultramafic, with komatiite as the fine-grained extrusive equivalent.
Pervasive Hydrothermal Events Associated with Large Igneous …
网页2020年6月23日 · We here report a new δ18O dataset for dikes and lavas from the Columbia River Basalt Group (16–15 Ma) in the western USA, and document that dikes on average are 1–2‰ more depleted in δ18O ...
Reshuffling the Columbia River Basalt chronology—Picture Gorge Basalt ...
网页2020年1月31日 · The Columbia River Basalt Group (CRBG) of the Pacific Northwest of the United States is the world’s youngest flood basalt and has played an important role in understanding the dynamics of large igneous provinces (LIPs).
6.4: Intrusive Igneous Rocks - Geosciences LibreTexts
网页2024年5月16日 · Large, irregularly shaped plutons are called stocks or batholiths, depending upon their size. Tabular plutons are called dikes if they cut across existing structures, and sills if they are parallel to existing structures. Laccoliths are like sills, except they have caused the overlying rocks to bulge upward.
Dike (Igneous) - SpringerLink
网页2015年11月20日 · A solidified near-vertical subsurface magma body that penetrates through one or more layers of preexisting rock bodies or layers (regardless of rock type). The thickness of a dike is much smaller (cm to meters) than the other dimensions (kilometers), forming a sheet-like structure.