agglomerate

agglomerate
—agglomerative /euh glom"euh ray'tiv, -euhr euh tiv/, adj. —agglomerator, n.
v. /euh glom"euh rayt'/; adj., n. /euh glom"euhr it, -euh rayt'/, v., agglomerated, agglomerating, adj., n.
v.t., v.i.
1. to collect or gather into a cluster or mass.
adj.
2. gathered together into a cluster or mass.
3. Bot. crowded into a dense cluster, but not cohering.
n.
4. a mass of things clustered together.
5. rock composed of rounded or angular volcanic fragments.
[1675-85; < L agglomeratus (ptp. of agglomerare), equiv. to ag- AG- + glomer- (s. of glomus ball of yarn) + -atus -ATE1]
Syn. 1. assemble, amass, accumulate.
Ant. 1. disperse, scatter.

* * *

Large, coarse, angular rock fragments associated with lava flow that are ejected during explosive volcanic eruptions.

Although they may appear to resemble sedimentary conglomerates, agglomerates are igneous rocks that consist almost wholly of angular or rounded lava fragments of varying size and shape. Some geologists sort agglomerates into bombs, blocks, and breccia. Bombs are ejected in a molten state, becoming rounded upon solidification, and blocks are erupted as solid fragments. Upon accumulation and solidification of the angular fragments (also known as pyroclastics), they form agglomerates.

* * *

▪ rock
 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 size and shape. Fragments are usually poorly sorted in a tuffaceous matrix, or appear in lithified volcanic dust or ash.

      Depending on the specific context, some geologists prefer to sort agglomerates into either bombs (bomb), blocks, or breccia. Bombs and blocks are generally larger than 32 mm (1.25 inches) in size; although bombs are ejected in a molten state (becoming rounded upon solidification), blocks are erupted as solid angular or subangular fragments. Upon accumulation, blocks form breccia, which are solid angular fragments larger than 64 mm.

* * *


Universalium. 2010.

Игры ⚽ Нужен реферат?
Synonyms:
, , , , , ,


Look at other dictionaries:

  • Agglomerate — Ag*glom er*ate, n. 1. A collection or mass. [1913 Webster] 2. (Geol.) A mass of angular volcanic fragments united by heat; distinguished from conglomerate. [1913 Webster] …   The Collaborative International Dictionary of English

  • Agglomerate — Ag*glom er*ate, v. t. [imp. & p. p. {Agglomerated}; p. pr. & vb. n. {Agglomerating}.] [L. agglomeratus, p. p. of agglomerare; ad + glomerare to form into a ball. See {Glomerate}.] To wind or collect into a ball; hence, to gather into a mass or… …   The Collaborative International Dictionary of English

  • Agglomerate — Ag*glom er*ate, v. i. To collect in a mass. [1913 Webster] …   The Collaborative International Dictionary of English

  • Agglomerate — Ag*glom er*ate, Agglomerated Ag*glom er*a ted, a. 1. Collected into a ball, heap, or mass. [1913 Webster] 2. (Bot.) Collected into a rounded head of flowers. [1913 Webster] …   The Collaborative International Dictionary of English

  • agglomerate — index accumulate (amass), agglomeration, aggregate (noun), aggregate (verb), cement, coadunate, cohere ( …   Law dictionary

  • agglomerate — (v.) 1680s, from L. agglomeratus, pp. of agglomerare to wind or add onto a ball, from ad to (see AD (Cf. ad )) + glomerare wind up in a ball, from glomus (gen. glomeris) ball of yarn, from PIE root *glem . Related: Agglomerated …   Etymology dictionary

  • agglomerate — agglomerate, agglomeration conglomerate, conglomeration, *aggregate, aggregation Analogous words: combination, association (see corresponding verbs at JOIN): accumulation (see corresponding verb ACCUMULATE): heap, pile, mass (see under HEAP vb) …   New Dictionary of Synonyms

  • agglomerate — ► VERB ▪ collect or form into a mass. ► NOUN ▪ a mass or collection of things. DERIVATIVES agglomeration noun. ORIGIN Latin agglomerare add to …   English terms dictionary

  • agglomerate — [ə gläm′ər āt΄; ] for adj. & n. [, ə gläm′ər it] vt., vi. agglomerated, agglomerating [< L agglomeratus, pp. of agglomerare < ad , to + glomerare, to form into a ball < IE base * glem , var. of * gel , form a ball, sphere, hence akin to… …   English World dictionary

  • Agglomerate — Agglomerates (from the Latin agglomerare meaning to form into a ball ) are coarse accumulations of large blocks of volcanic material that contain at least 75% bombs. Volcanic bombs differ from volcanic blocks in that their shape records fluidal… …   Wikipedia

  • agglomerate — I. transitive verb ( ated; ating) Etymology: Latin agglomeratus, past participle of agglomerare to heap up, join, from ad + glomer , glomus ball more at clam Date: 1684 to gather into a ball, mass, or cluster II. adjective Date: 1828 gathered… …   New Collegiate Dictionary

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”