Sillatöid

Sillatöid, also known as sillatoid, is a term used in geology to describe a type of igneous intrusion that is characterized by its tabular or sheet-like shape. These intrusions are typically formed when magma is injected into fractures or weaknesses in the surrounding rock, often at shallow depths. Sillatöids are commonly found in volcanic regions and are associated with the emplacement of lava flows. They can vary in size, ranging from a few meters to several kilometers in thickness, and can extend over large areas. The term "sillatöid" is used to differentiate these intrusions from true sills, which are more horizontal and have a more uniform thickness. Sillatöids can have a significant impact on the surrounding rock, altering its structure and mineral composition. They are often studied by geologists to understand the dynamics of magma emplacement and the geological history of a region.