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Syenitoid

A rock classification type

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Photos of Syenitoid (51)Recorded Ages and Analyses Discuss Syenitoid

Syenitoid Gallery Search Photos of Syenitoid

Edit Syenitoid Add Synonym Add Sub-type (rock)Edit CIF structures Clear Cache

Pegmatitic peralkaline syenite, etc.

Sagåsen Quarry, Sagåsen, Auenlandet, Porsgrunn, Telemark, Norway

Larvikite

Almenningen Quarry, Tvedalen, Larvik Commune, Vestfold, Norway

Monzonite

Algajola, Calvi, Haute-Corse, Corsica, France

Pegmatitic peralkaline syenite, etc.

Sagåsen Quarry, Sagåsen, Auenlandet, Porsgrunn, Telemark, Norway

Larvikite

Almenningen Quarry, Tvedalen, Larvik Commune, Vestfold, Norway

Monzonite

Algajola, Calvi, Haute-Corse, Corsica, France

Pegmatitic peralkaline syenite, etc.

Sagåsen Quarry, Sagåsen, Auenlandet, Porsgrunn, Telemark, Norway

Larvikite

Almenningen Quarry, Tvedalen, Larvik Commune, Vestfold, Norway

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About SyenitoidHide

A coarse grained felsic igneous rock having an alkali-feldspar/plagioclase ratio from 0.9-0.35, 0-10% foids and 0-20% quartz.

Unique IdentifiersHide

Mindat ID:

48178

Long-form identifier:

mindat:1:1:48178:8

Classification of SyenitoidHide

Rock
- Igneous rock
  - Normal crystalline igneous rock
    - Coarse-grained ("plutonic") crystalline igneous rock
      - Syenitoid

QAPF_P_6,6star,6-,7,7star,7-,8,8star,8-.png

Rocks in sections 6,6*,6',7,7*,7',8,8* and 8' of the QAPF diagram.

Sub-divisions of SyenitoidHide

Syenitoid

Mineralogy of SyenitoidHide

Essential minerals - these are minerals that are required within the classification of this rock:

Feldspar > Alkali Feldspar

A subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium.

Non-essential minerals - these minerals are common, sometimes major components, but are not always present:

Amphibole > Hornblende	A_nCa₂(Z²⁺_5-mZ³⁺_m)(Si_8-(n+m)Al_(n+m))(OH,F,Cl)₂
Mica > Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂

Pronunciation of SyenitoidHide

Pronunciation:

Play	Recorded by	Country
	Jolyon Ralph	United Kingdom

View all 74 analyses with additional filters.

Age distributionHide

Recorded ages:

to Neogene : 2360 ± 96 Ma to 10.4 ± 0.3 Ma - based on 74 recorded ages.

Sample ages:

Sample ID	Recorded age	Geologic Time	Dating method
1	11.1 ± 0.5 Ma	Miocene
2	24.1 ± 1.2 Ma	Oligocene	Rb-Sr
3	45 ± 1 Ma	Eocene	K-Ar
4	87.1 to 78.7 Ma	Late/Upper Cretaceous	K-Ar
5	121 to 105 Ma	Early/Lower Cretaceous
6	127 ± 0.8 Ma	Early/Lower Cretaceous	U-Pb
7	129.9 ± 0.8 Ma	Early/Lower Cretaceous	LA-ICP-MS zircon U-Pb
8	130.1 ± 1.0 Ma	Early/Lower Cretaceous	LA-ICP-MS zircon U-Pb
9	134.8 Ma	Early/Lower Cretaceous	K-Ar whole rock
10	145 to 143 Ma	Early/Lower Cretaceous	K-Ar
11	173 ± 2 Ma	Middle Jurassic	Rb-Sr whole rock
12	223 ± 9 Ma	Late/Upper Triassic	Rb-Sr whole rock
13	256 ± 6 to 261 ± 6 Ma	Permian	Whole rock K/Ar
14	300 ± 6 Ma	Pennsylvanian
15	351 ± 7 Ma	Mississippian	K-Ar
16	409 ± 2 Ma	Early/Lower Devonian	LA-ICP-MS zircon U-Pb
17	526 ± 26 Ma	Terreneuvian	K-Ar
18	767 ± 8 Ma	Tonian	Rb-Sr isochron
19	1190 ± 25 Ma	Stenian	K-Ar
20	2360 ± 96 Ma	Siderian	Rb-Sr of 6 syenites

Sample references:

ID	Locality	Reference	Notes
1	Anjouan, Comoros	Nougier, J., Cantagrel, J.M., Karche, J.P. (1986) The Comores archipelago in the western Indian Ocean: volcanology, geochronology and geodynamic setting. Journal of African Earth Sciences (1983), 5 (2). 135-145 doi:10.1016/0899-5362(86)90003-5
2	Haast River, Westland District, West Coast Region, New Zealand	Cooper, A. F.; Barreiro, B. A.; Kimbrough, D.L.; Mattinson, J. M. (1987) Lamprophyre dike intrusion and the age of the Alpine fault, New Zealand. Geology, 15 (10). 941-944 doi:10.1130/0091-7613(1987)15<941:ldiata>2.0.co;2
3	Nlonako Intrusion, Littoral Region, Cameroon	Cantagrel, J. M., Jamond, C. & Lasserre, M. (1978). LE MAGMATISME ALCALIN DE LA LIGNE DU CAMEROUN AU TERTIAIRE INFERIEUR: DONNEES GEOCHRONOLOGIQUES K/AR. Bulletin de la Societe Geologique de France Compte Rendu Sommaire des Seances, 20, 300-303.
4	Catalão I carbonatite complex, Catalão, Goiás, Brazil	Orris, Greta J., Grauch, Richard I. (2002) Rare Earth Element Mines, Deposits, and Occurrences. Open-File Report 2002-189. US Geological Survey doi:10.3133/ofr02189
5	Sikkim, Namchi, South Sikkim district, Sikkim, India	Parthasarathy, T.N., Parihar, P.S. & Krishna, K.V.G. 1990. Potash feldspar-rich alkaline rocks of Rangit Tectonic Window, south Sikkim: their genesis and relation to uranium, thorium, and REE mineralizations in the area. Exploration and Research for Atomic Minerals, 3, 115-130.
6	Longbaoshan intrusion, Lanling County, Linyi, Shandong, China	Zhang, H. F., Sun, M., Zhou, X. H., & Ying, J. F. (2005). Geochemical constraints on the origin of Mesozoic alkaline intrusive complexes from the North China Craton and tectonic implications. Lithos, 81(1-4), 297-317.
7	" "	Lan, T. G., Fan, H. R., Hu, F. F., Tomkins, A. G., Yang, K. F., & Liu, Y. (2011). Multiple crust
8	" "	Lan, T. G., Fan, H. R., Hu, F. F., Tomkins, A. G., Yang, K. F., & Liu, Y. (2011). Multiple crust	Hornblende syenite
9	Zijinshan Complex, Xing County, Lüliang, Shanxi, China	Bai, G. (1985). Carbonatites and related mineral resources. Bull. Inst. Miner. Deposits Chin. Acad. Geol. Sci., 13, 1-193.
10	Bayan Khoshuu Complex, Mandal-Ovoo District, Ömnögovi Province, Mongolia	Gerel, O., Munkhtsengel, B., Enkhtuvshin, H. & Iizumi, S. 2005. Mushgai Khudag and Bayan Khoshuu volcanic-plutonic alkaline complexes with REE
11	Sistefjell, Queen Maud Land, East Antarctica, Antarctica	Harris, C., Johnstone, W. P., & Phillips, D. (2002). Petrogenesis of the Mesozoic Sistefjell syenite intrusion, Dronning Maud Land, Antarctica and surrounding low-?18O lavas. South African Journal of Geology, 105(3), 205-226.
12	Bir Um Hibal Complex, Aswan Governorate, Egypt	Hashad, A. H., AH, H., & EL REEDY, M. W. M. (1979). Geochronology of the anorogenic alkalic rocks South Eastern Desert, Egypt. Annals of the Geological Survey of Egypt, 9, 81-101.
13	Heilefjellet dikes, Dalsfjorden, Askvoll, Vestland, Norway
14	Huangyangshan, Changji Autonomous Prefecture, Xinjiang, China	Yang, G., Li, Y., Wu, H., Zhong, X., Yang, B., Yan, C., ... & Si, G. (2011). Geochronological and geochemical constrains on petrogenesis of the Huangyangshan A-type granite from the East Junggar, Xinjiang, NW China. Journal of Asian Earth Sciences, 40(3), 722-736.
15	Tarbtie North Intrusion, Red Sea Governorate, Egypt	Serencsits, C. M., CM, S., KA, F., & El Ramly, M. F. (1979). Alkaline ring complexes in Egypt: their ages and relationship to tectonic development of the Red Sea. Annals of the Geological Survey of Egypt, 9, 102-116.
16	Sandaogou, Chahar Right Back Banner, Ulanqab City, Inner Mongolia, China	Zhang, X., Zhang, H., Jiang, N., Zhai, M., & Zhang, Y. (2010). Early Devonian alkaline intrusive complex from the northern North China craton: a petrological monitor of post-collisional tectonics. Journal of the Geological Society, 167(4), 717-730.
17	Haute Ruvubu Complex, Kayanza Province, Burundi	Lubala, R. T., Kampunzu, A. B., & Makutu, M. N. (1985). Un inventaire des complexes anorogéniques du Burundi, du Ruanda et du Zaïre. Journal of African Earth Sciences (1983), 3(1-2), 169-174. doi.org/10.1016/0899-5362(85)90034-X
18	Sevattur carbonatite complex, Krishnagiri District, Tamil Nadu, India	Kumar, A., Charan, S. N., Gopalan, K., & Macdougall, J. D. (1998). A long-lived enriched mantle source for two Proterozoic carbonatite complexes from Tamil Nadu, southern India. Geochimica et Cosmochimica Acta, 62(3), 515-523.
19	Nemegos carbonatite, Nemegos area, Unorganized North Sudbury District, Sudbury District, Ontario, Canada	Orris, Greta J., Grauch, Richard I. (2002) Rare Earth Element Mines, Deposits, and Occurrences. Open-File Report 2002-189. US Geological Survey doi:10.3133/ofr02189
20	Fitzgerald Peaks Occurrence, Esperance Shire, Western Australia, Australia	De Laeter, J. R., & Lewis, J. D. (1978). The age of the syenitic rocks of the Fitzgerald Peaks, near Norseman. West. Aust. Geol. Surv. Annu. Rep., 1977, 56-60.

Chemical AnalysisHide

Oxide wt%:

	1	2	3
SiO₂	56.86 %	51.44 %	55.75 %
Al₂O₃	19.46 %	19.66 %	16.31 %
TiO₂	0.99 %	1.65 %	1.43 %
Fe₂O₃	2.00 %	2.00 %	3.09 %
FeO	2.34 %	4.5 %	6.23 %
MgO	0.63 %	1.5 %	1.32 %
MnO	0.16 %	0.27 %	0.21 %
Na₂O	7.57 %	7.10 %	5.91 %
CaO	3.72 %	7.26 %	3.54 %
K₂O	5.89 %	3.85 %	4.92 %
P₂O₅	0.12 %	0.28 %	0.5 %
H₂₀			0.57 %
Total:	99.74 %	99.51 %	99.78 %

Sample references:

ID	Locality	Reference	Notes
1	Mont Royal, Montréal, Québec, Canada	Woussen, Gerard (1970) La geologie du complexe igne du Mont Royal [The geology of the Mount Royal igneous complex]. The Canadian Mineralogist, 10 (3). p.432-451.	Wet chemical analysis by G. Woussen and B.M.Gunn. The Fe2O3 percentage is arbitrarily set to 2%.
2	" "	Woussen, Gerard (1970) La geologie du complexe igne du Mont Royal [The geology of the Mount Royal igneous complex]. The Canadian Mineralogist, 10 (3). p.432-451.	Wet chemical analysis by G. Woussen and B.M.Gunn. The Fe2O3 percentage is arbitrarily set to 2%.
3	Ilímaussaq complex, Kujalleq, Greenland	Ferguson, John (1970) The differentiation of agpaitic magmas; the Ilimaussaq intrusion, south Greenland. The Canadian Mineralogist, 10 (3). p.335-349.	Average of 8 analyses of a rock containing K-feldspar/perthites (72.4 vol%), pyroxene (6.9vol%), amphibole(3.7 vol%), olivine (6.3 vol%), mica (5.5 vol%), apatite (1 vol%), opaques (3.6 vol%), chlorite (0.6 vol%) & nepheline (tr). Analytical method is not given but presumably wet chemical.

Synonyms of SyenitoidHide

Syenitic-rock

Internet Links for SyenitoidHide

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References for SyenitoidHide

Reference List:

Le Maitre, R. W. - Ed. (2002) Igneous Rocks - A Classification and Glossary of Terms (2nd ed.) Cambridge University Press. doi:10.1017/cbo9780511535581

Verner, Kryštof, Jiří Žák, , Hrouda, František, Holub, František V. (2006) Magma emplacement during exhumation of the lower- to mid-crustal orogenic root: The Jihlava syenitoid pluton, Moldanubian Unit, Bohemian Massif. Journal of Structural Geology, 28 (8). 1553-1567 doi:10.1016/j.jsg.2006.03.037

Janoušek, Vojtěch, Holub, František V., Verner, Kryštof, Čopjaková, Renata, Gerdes, Axel, Hora, John M., Košler, Jan, Tyrrell, Shane (2019) Two-pyroxene syenitoids from the Moldanubian Zone of the Bohemian Massif: Peculiar magmas derived from a strongly enriched lithospheric mantle source. Lithos, 342. 239-262 doi:10.1016/j.lithos.2019.05.028

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