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Foid-syenite

A rock classification type

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Photos of Foid-syenite (41)Recorded Ages and Analyses Discuss Foid-syenite

Foid-syenite Gallery Search Photos of Foid-syenite

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Kakortokite

Ilímaussaq complex, Kujalleq, Greenland

Kakortokite

Ilímaussaq complex, Kujalleq, Greenland

Pegmatitic nepheline syenite

Papeno'o Valley, Papenoo, Hitiaa O Te Ra, Tahiti Island, Windward Islands, Society Islands, French Polynesia, France

Kakortokite

Ilímaussaq complex, Kujalleq, Greenland

Kakortokite

Ilímaussaq complex, Kujalleq, Greenland

Pegmatitic nepheline syenite

Papeno'o Valley, Papenoo, Hitiaa O Te Ra, Tahiti Island, Windward Islands, Society Islands, French Polynesia, France

Kakortokite

Ilímaussaq complex, Kujalleq, Greenland

Kakortokite

Ilímaussaq complex, Kujalleq, Greenland

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About Foid-syeniteHide

A foid-syenitic-rock where K-feldspar is >90% of feldspars.
A coarse-grained crystalline, usually plutonic, igneous rock rich in feldspathoids (foids) like nepheline and cancrinite, with <90% mafics, 10-60% of felsics being foids and alkali feldspar > 90% of feldspars.

Unique IdentifiersHide

Mindat ID:

48347

Long-form identifier:

mindat:1:1:48347:6

Classification of Foid-syeniteHide

Rock
- Igneous rock
  - Normal crystalline igneous rock
    - Coarse-grained ("plutonic") crystalline igneous rock
      - Foid-syenitoid
        Foid-syenite

Foid-syenite is in section 11 of the QAPF diagram.

Sub-divisions of Foid-syeniteHide

Mineralogy of Foid-syeniteHide

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.
Feldspathoid	A family of rock-forming minerals consisting of aluminosilicates of sodium, potassium, or calcium and having too ...

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

View all 43 analyses with additional filters.

Age distributionHide

Recorded ages:

to Neogene : 2376 ± 36 Ma to 2.64 Ma - based on 43 recorded ages.

Sample ages:

Sample ID	Recorded age	Geologic Time	Dating method
1	2.64 Ma	Pliocene	K-Ar
2	44 Ma	Eocene	K-Ar
3	81.9 ± 1.3 Ma	Late/Upper Cretaceous	Rb-Sr
4	86 ± 15 to 83 ± 3 Ma	Late/Upper Cretaceous	K-Ar
5	93 ± 6 to 88 ± 2 Ma	Late/Upper Cretaceous	Rb-Sr
6	126 ± 4 Ma	Early/Lower Cretaceous	Rb-Sr
7	140.2 ± 1.0 Ma	Early/Lower Cretaceous	Ar/Ar
8	146 to 145 Ma	Late Jurassic	K-Ar
9	226 ± 2 to 224 ± 2 Ma	Late/Upper Triassic	U-Pb on zircon
10	244.9 ± 22.4 Ma	Middle Triassic	whole-rock isochron
11	248.8 to 219.2 ± 5.5 Ma	Triassic	K-Ar whole rock
12	404 ± 9 to 402 ± 8 Ma	Early/Lower Devonian	K-Ar
13	462 Ma	Middle Ordovician	Sm-Nd isochron
14	519 ± 40 Ma	Cambrian Series 2	Sm-Nd
15	685 ± 62 Ma	Cryogenian	Rb-Sr whole rock
16	856 ± 18 Ma	Tonian	Rb-Sr whole rock isochron
17	1348 ± 41 Ma	Ectasian
18	1369 ± 28 Ma	Ectasian	whole rock
19	1740 Ma	Statherian	K-Ar
20	2376 ± 36 Ma	Siderian	Rb-Sr whole rock isochron

Sample references:

ID	Locality	Reference
1	Mount Kenya, Mount Kenya National Park, Meru County, Kenya	Baker, B.H., Williams, L.A.J., Miller, J.A., Fitch, F.J. (1971) Sequence and geochronology of the Kenya rift volcanics. Tectonophysics, 11 (3) 191-215 doi:10.1016/0040-1951(71)90030-8
2	Jebel Arkenu, Kufra District, Libya	Schürmann, H. M. E. (1974) The Pre-Cambrian in North Africa. E. J. Brill, Leiden.
3	Fitou nepheline syenite intrusion, Fitou, Narbonne, Aude, Occitanie, France	Vitrac-Michard, A., Albar
4		Meneisy, M. Y., & MY, M. (1974). POTASSIUM-ARGON AGES OF NEPHELINE SEYENITE RING COMPLEXES IN EGYPT. Geologisches Jahrbuch, Hannover, D9, 33-39.
5	" "	Lutz, T. M., Foland, K. A., Faul, H., & Srogi, L. (1988). The strontium and oxygen isotopic record of hydrothermal alteration of syenites from the Abu Khruq complex, Egypt. Contributions to Mineralogy and Petrology, 98(2), 212-223. doi.org/10.1007/BF00402113
6	Mount Tchivira, Quilengues, Huíla Province, Angola	Torquato, J. R. (1977). GEOTECTONIC OUTLINE OF ANGOLA. Cahiers de l'Office de la Recherche Scientifique et Technique Outre-Mer. Paris, Serie Geologie, 9, 15-34.
7	Cape Cross area, Arandis Constituency, Erongo Region, Namibia	MILNER, S. C., LE ROEX, A. P., O'CONNOR, J. M. (1995) Age of Mesozoic igneous rocks in northwestern Namibia, and their relationship to continental breakup. Journal of the Geological Society, 152 (1). 97-104 doi:10.1144/gsjgs.152.1.0097
8	El Naga Ridge, 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.
9	Hekanzi Mo deposit, Lingyuan City, Chaoyang, Liaoning, China	Yang, J. H., Sun, J. F., Zhang, M., Wu, F. Y., & Wilde, S. A. (2012). Petrogenesis of silica-saturated and silica-undersaturated syenites in the northern North China Craton related to post-collisional and intraplate extension. Chemical Geology, 328, 149-167. Data
10	Lugeengol REE deposit, Khatanbulag District, Dornogovi Province, Mongolia	Munkhtsengel, B., & IIZUMI, S. (2005). Petrology and geochemistry of the Lugiin Gol nepheline syenite complex, South Mongolia. Geodynamics and Metallogeny of Mongolia with a Special Emphasis on Copper and Gold Deposits. IAGOD Guidebook Series, 11, 203-214.
11	Yangyuan complex, Yangyuan County, Zhangjiakou, Hebei, China	Feng-Jun, N., & Wu Cheng-Yu, W. (1998). Gold deposits related to alkaline igneous rocks in North China craton, People's Republic of China. Global Tectonics and Metallogeny, 159-172.
12	Lillebukt Nepheline Mine, Lillebukt Alkaline Complex, Stjernøya Island, Alta, Troms og Finnmark, Norway	Sturt, Brian A.; Miller, J.A.; Fitch, Frank J. (1967) The age of alkaline rocks from West Finnmark, Northern Norway, and their bearing on the dating of the Caledonian Orogeny. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 47 (3). 255-273
13	Pinghe, Nanjiang Co., Bazhong, Sichuan, China	Zhou, L. D., Zhao, Z. H., & Zhou, G. F. (1996). Isotopic chronology of some alkaline rock bodies in China. Geochimica, 25(2), 164-171.
14	Pia Ma Intrusion, Chợ Đồn District, Bac Kan Province, Vietnam	Chi, N. T., & Flower, M. F. Geochemistry of Sodium Alkaline Igneous Formations in NE Vietnam: Evidence of Paleohotspot & Mesohotspot Traces. Poster presented at the Goldschmitt Conference.
15	Ilomba intrusion, Songwe Complex, Chitipa, Northern Region, Malawi	RAY, GERALD E. (1974) The structural and metamorphic geology of northern Malawi. Journal of the Geological Society, 130 (5) 427-440 doi:10.1144/gsjgs.130.5.0427
16	Koraput gabbro/nepheline syenite, Koraput District, Odisha, India	Sarkar, A., Paul, D. K., Bishui, P. K., Gupta, S. N., & Nanda, J. K. (1989). Late Proterozoic alkaline magmatism in the Eastern Ghats Belt: Rb-Sr isotopic study on the Koraput complex, Orissa. Indian Minerals, 43(3-4), 265-272.
17	Uppalapadu Pluton, Prakasam District, Andhra Pradesh, India	Ratnakar, J., Zaitsev, V., Srinivas, M., Vijaya, K.K. & Rathna, K. 2009. Mesoproterozoic nepheline syenite complexes of the Prakasam alkaline province, Andhra Pradesh, India. Paper presented at the XXVI International Conference, Geochemistry of Magmatic Rocks, Vernadsky Institute of Geochemistry, Russian Academy of Sciences, Moscow, Russia, 11-15 May 2009, 120-122.
18	Purimetla, Prakasam District, Andhra Pradesh, India	Ratnakar, J., Zaitsev, V., Srinivas, M., Vijaya, K.K. & Rathna, K. 2009. Mesoproterozoic nepheline syenite complexes of the Prakasam alkaline province, Andhra Pradesh, India. Paper presented at the XXVI International Conference, Geochemistry of Magmatic Rocks, Vernadsky Institute of Geochemistry, Russian Academy of Sciences, Moscow, Russia, 11-15 May 2009, 120-122.
19	Malotersyanskii, Synelnykove Raion, Dnipropetrovsk Oblast, Ukraine	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	Pikkili, Dharmapuri 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.

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References for Foid-syeniteHide

Reference List:

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