Allochems
Definition
Organized structural components of carbonate origin that formed by chemical precipitation or biological activity within a sedimentary basin and underwent local transport before final deposition; they include ooids, bioclasts, intraclasts, and peloids, representing the major constituent elements of many limestone rocks according to Folk's classification.
Bilingual Equivalents
- Allochems
- Allochemical grains
Grammatical & Source Details
| Inflection Type | Feminine plural noun with standard morphological variations (singular: allochem, plural: allochems). |
| Formation | Scientific term coined from the Greek 'allos' (other) and 'chemical', functionally stabilized to contrast with orthochems. |
| Spelling / Pronunciation | [ˈæləʊkɛmz] |
| Source | Folk's Classification of Carbonate Rocks Handbook |
Contextual Usage Examples
RO: Analiza microscopică a arătat că această rocă conține numeroase alocheme, în special resturi de foraminifere.
EN: Microscopic analysis showed that this rock contains numerous allochems, especially foraminifera remains.
RO: Procentul de alocheme dintr-un calcar determină încadrarea sa structurală într-o anumită clasă sedimentologică.
EN: The percentage of allochems within a limestone determines its structural placement within a specific sedimentological class.
RO: Spre deosebire de ortocheme, aceste alocheme au fost rearanjate de curenții subacvatici înainte de cimentare.
EN: Unlike orthochems, these allochems were rearranged by underwater currents before cementation.
Idioms & Phrases
Calcar cu alocheme / Allochemical limestone
RO: Rocă sedimentară carbonatică a cărei matrice structurală este dominată de granule transportate și cimentate ulterior.
EN: A carbonate sedimentary rock whose structural matrix is dominated by grains that were transported and later cemented.
Tipuri de alocheme / Types of allochems
RO: Categorisire sedimentologică ce separă intraclastele, oolitele, peletele și bioclastele în funcție de originea lor structurală.
EN: Sedimentological categorization separating intraclasts, ooids, peloids, and bioclasts according to their structural origin.
Matrice fără alocheme / Allochem-free matrix
RO: Zonă din structura rocii formată exclusiv din micrit fin sau sparit, lipsită de granule organogene vizibile.
EN: An area within the rock structure formed exclusively of fine micrite or sparite, lacking visible organogenous grains.
Latest Contextual News
No recent news found for this topic.