Mangerite

Mangerite is a plutonic rock of intermediate composition belonging to the granitoids .

Etymology and first description

The rock Mangerite was named after its type locality , the Norwegian village Manger in Vestland (north of Bergen ). It was first scientifically described in 1903 by Carl Frederik Kolderup .

Petrography

In the route iron diagram, the mangerites are identical to the monzonites

Mangerites belong to the series of orthopyroxene- bearing Charnockites . Mangerites are orthopyroxen monzonites (mostly with hyperstheses ) that are located in the QAPF field 8 of the monzonites in the line iron diagram . They have an intermediate SiO ₂ content and approximately equal volume proportions of alkali feldspar and plagioclase . They are characterized by the relatively common mesoperthite .

mineralogy

The following minerals can occur in mangerites :

Alkali feldspar (mesoperthite)
Plagioclase
quartz
Hypersthene
Clinopyroxene
Biotite
Olivine (fayalite) - rare
Amphibole

Occurrence

Mangerites occur predominantly in the metamorphic belts of the Proterozoic , mostly in association with norites , anorthosites , charnockites and Rapakiwi granites. They are also part of the so-called AMCG plutons (acronym for anorthosite, mangerite, charnockite and granite).

In addition to the type locality near Bergen, the following examples are given:

Svekofennic orogeny

Lofoten in Northern Norway

Medecine Bow Orogeny in Wyoming - AMCG Plutons

Horse Creek Anorthosite - 1760 million years old BP

Laramie anorthosite - AMCG pluton - 1430 million years BP

Pinwarian Orogeny in Labrador - AMCG Plutons - 1520 to 1460 million years BP

Michikamau - 1460 million years BP
Harp Lake - 1448 to 1426 million years BP
Mistastin - around 1420 million years BP

Grenville Orogenes - AMCG Plutons - 1090 to 980 million years BP

Bloomingdale mangerite in the Adirondacks - 1164 million years old BP

Mangerite dike in anorthosite from Wabeek , Adirondacks - 1160 million years BP

Svekonorwegian orogeny (1100 to 930 million years BP):

Lopolith from Bjerkreim - Sokndal in southern Norway (mangerite and quartz mangerite) - around 930 to 920 million years BP

Fayalite - leading mangerite from Morkeheia near Gjerstad in southern Norway

Aïr , Niger - AMCG plutons (sub-volcanic ring complexes) - 420 to 410 million years BP ( Silurian-Devonian border )

Alpidian orogeny :

Predazzo massif in northern Italy (orthopyroxene-leading monzonites) - Triassic (Ladin), around 230 million years BP

Individual evidence

↑ Kolderup, CF: The Labrador Rock of Western Norway. II. The Labrador rock and the rocks related to it in the Bergens region . In: Bergens Museums Aarbog (Årbok), Afhandlinger og Årsberetning . Vol. 12, 1903, pp. 1-29 .
↑ Corfu, F. (2007): Multistage metamorphic evolution and nature of the amphibolite – granulite facies transition in Lofoten – Vesterålen, Norway, revealed by U – Pb in accessory minerals. Chemical Geology 241, 108-128
↑ Scoates, JS and Chamberlain, KR: Orogenic to postorogenic origin for the 1.76 Ga Horse Creek anorthosite complex, Wyoming, USA : In J. Geol. Band 105 , 1997, pp. 331-343 .
↑ Frost, CD ao: Single-crystal U-Pb zircon age determination of the Red Mountain pluton, Laramie anorthosite complex, Wyoming . In: Am. Mineral. tape 75 , 1990, pp. 21-26 .
↑ McLelland, JM et al .: Direct dating of Adirondack massif anorthosite by U-Pb SHRIMP analysis of igneous zircon: implications for AMCG complexes . In: Geol. Soc. At the. Bull. Band 116 , 2004, pp. 1299-1317 .
↑ Michot, J. and Michot, P .: The problem of anorthosites: The South Rogaland igneous complex, southwestern Norway . In: New York State Mus. Sci. Serv. Mem. Band 18 , 1968, p. 399-410 .
↑ Touret, J .: Sur la présence de mangérite à fayalite au NE de Gjerstad (Norvège méridionale) . In: CR Com. Soc. Géol. France . tape 6 , 1967, p. 252 .
↑ Moreau, C. et al: A tectonic model for the location of Paleozoic ring complexes in Aïr (Niger, West Africa) . In: Tectonophysics . tape 234 , 1994, pp. 129-146 .

[1] Kolderup, CF: The Labrador Rock of Western Norway. II. The Labrador rock and the rocks related to it in the Bergens region . In: Bergens Museums Aarbog (Årbok), Afhandlinger og Årsberetning . Vol. 12, 1903, pp. 1-29 .

[2] Corfu, F. (2007): Multistage metamorphic evolution and nature of the amphibolite – granulite facies transition in Lofoten – Vesterålen, Norway, revealed by U – Pb in accessory minerals. Chemical Geology 241, 108-128

[3] Scoates, JS and Chamberlain, KR: Orogenic to postorogenic origin for the 1.76 Ga Horse Creek anorthosite complex, Wyoming, USA : In J. Geol. Band 105 , 1997, pp. 331-343 .

[4] Frost, CD ao: Single-crystal U-Pb zircon age determination of the Red Mountain pluton, Laramie anorthosite complex, Wyoming . In: Am. Mineral. tape 75 , 1990, pp. 21-26 .

[5] McLelland, JM et al .: Direct dating of Adirondack massif anorthosite by U-Pb SHRIMP analysis of igneous zircon: implications for AMCG complexes . In: Geol. Soc. At the. Bull. Band 116 , 2004, pp. 1299-1317 .

[6] Michot, J. and Michot, P .: The problem of anorthosites: The South Rogaland igneous complex, southwestern Norway . In: New York State Mus. Sci. Serv. Mem. Band 18 , 1968, p. 399-410 .

[7] Touret, J .: Sur la présence de mangérite à fayalite au NE de Gjerstad (Norvège méridionale) . In: CR Com. Soc. Géol. France . tape 6 , 1967, p. 252 .

[8] Moreau, C. et al: A tectonic model for the location of Paleozoic ring complexes in Aïr (Niger, West Africa) . In: Tectonophysics . tape 234 , 1994, pp. 129-146 .