2023年8月15日 · Clasts in agglomerate rocks can be made of a variety of materials, such as different types of rocks, minerals, and even volcanic material like pumice or basalt. These clasts are typically angular or rounded, depending on the processes that shaped and transported them.

2022年10月26日 · Agglomerates refer to the accumulation of coarse volcanic material (clasts, lava) and sometimes country rock fragments with at least 75% bombs set in a finer-grained matrix (lava, volcanic ash, tuff, or tuffaceous matrix). Volcanic bombs are rounded to spheroidal igneous material more than 64 mm in size.

Agglomerate (from the Latin agglomerare meaning "to form into a ball") is a coarse accumulation of large blocks of volcanic material that contains at least 75% bombs. Volcanic bombs differ from volcanic blocks in that their shape records fluidal surfaces: they may, for example, have ropy, cauliform, scoriaceous , folded, spindle, spatter ...

These agglomerates contain a diverse set of clasts: quartzite, vein quartz, Dalradian schists, basalt, and sedimentary rocks of Devonian age, as well as the fine grained acidic matrix which gives the agglomerate its name.

Agglomerate, large, coarse, rock fragments associated with lava flow that are ejected during explosive volcanic eruptions. Although they closely resemble sedimentary conglomerates, agglomerates are pyroclastic igneous rocks that consist almost wholly of angular or rounded lava fragments of varying

Basalt is a dark-coloured, fine grained, extrusive igneous rock, composed mainly of plagioclase feldspar and pyroxene with or without olivine. Basalt may often contain phenocrysts of plagioclase or olivine. In terms of igneous rocks, basalt is the "daddy", so to speak.

The agglomerate is injected with various thin irregular squirts of basalt; and in one inaccessible cliff there is a remarkable aggregation of pieces of limestone, some of them six feet long, lying in a matrix which seemed from below as if it might be basalt"

A pyroclastic rock in which more than 75% of the pyroclastic fragments exceed 64mm and at least 50% of these are rounded.

Agglomerate is commonly found in areas of active or past volcanic activity, where explosive eruptions have produced large amounts of fragmented material that has been transported and deposited by water, wind, or gravity. It can be found in various geological settings, including volcanic fields, calderas, and volcanic islands.

"Thumbnail" definitions attached to some of the table entries are an interim attempt to provide simple short descriptions of the "unqualified" rock types presented within the BGS Rock Classification Scheme. Every effort has been made to ensure accuracy and consistency but minor contradictions or omissions might be present.