Lopolith

Lopolith

A lopolith is a large igneous intrusion which is lenticular in shape with a depressed central region. Lopoliths are generally concordant with the intruded strata with dike or funnel-shaped feeder bodies below the body. The term was first defined and used by Frank Fitch Grout during the early 1900s in describing the Duluth gabbro complex in northern Minnesota and adjacent Ontario.

Lopoliths typically consist of large ultramafic to mafic layered intrusions that range in age from Archean to Eocene. Examples include the Duluth gabbro, the Sudbury Igneous Complex of Ontario, the Bushveld igneous complex of South Africa, the Skaergaard complex of Greenland and the Humboldt lopolith of Nevada. The Sudbury and Bushveld occurrences have been attributed to impact events and associated crustal melting.

References

*Blatt, Harvey and Robert J. Tracy, 1996, "Petrology: Igneous, Sedimentary and Metamorphic", 2nd ed., pp. 15-16, Freeman, ISBN 0-7167-2438-3
*Guilbert, John M., and Park, Charles F., Jr. (1986) "The Geology of Ore Deposits", Freeman, ISBN 0-7167-1456-6


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  • lopolith — /lop euh lith/, n. Geol. a mass of igneous rock similar to a laccolith but concave downward rather than upward. [1915 20; < Gk lop(ós) shell, husk + o O + LITH] * * * ▪ geology       igneous intrusion associated with a structural basin, with… …   Universalium

  • Lopolith — Ein Lopolith ist ein Pluton, der Gesteinskörper mit einer zentralen, schüsselförmigen Vertiefung ausbildet. Die Intrusion ist im Wesentlichen konkordant zu den umgebenden Schichten. Die Aufstiegswege des magmatischen Materials sind entweder… …   Deutsch Wikipedia

  • lopolith — noun a) a mass of volcanic or igneous rock found within strata which has spilled downward into underlaying strata and forms depressed regions. b) mass similar to laccolith but concave down …   Wiktionary

  • Lopolith — Lopolịth   [zu griechisch lopós »Rest«, »Rückstand« und líthos »Stein«] der, s oder en/ e(n), Geologie: schüssel bis trichterförmiger Tiefengesteinskörper (Plutone); z. B. der Buschveld Komplex …   Universal-Lexikon

  • Lopolith — Lo|po|lith [auch ... lit] der; Gen. s u. en, Plur. e[n] <zu gr. lopós »Rückstand, Hülse« u. ↑...lith> schüssel bis trichterförmiger Tiefengesteinskörper (Geol.) …   Das große Fremdwörterbuch

  • lopolith — complex laccolith with a centrally sunken base Stones and Rocks …   Phrontistery dictionary

  • lopolith — [ lɒpə(ʊ)lɪθ] noun Geology a large saucer shaped intrusion of igneous rock. Origin early 20th cent.: from Gk lopas basin + lith …   English new terms dictionary

  • lopolith — lop·o·lith …   English syllables

  • lopolith — n. Geol. a large saucer shaped intrusion of igneous rock. Etymology: Gk lopas basin + LITH …   Useful english dictionary

  • Beaver-Bay-Komplex — Das schattierte Reliefbild zeigt den Duluth Komplex, der sich bogenförmig von Duluth zum Pigeon Point zieht und dabei die Mesabi Range und die Gunflint Range unterbricht Der Duluth Komplex, der damit verbundene Beaver Bay Komplex (der oft als… …   Deutsch Wikipedia

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