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Alkali-feldspar-granite

A rock classification type
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08864220017271953443428.jpg
Dalmatian Stone, etc.

Ahumada Municipality, Chihuahua, Mexico
06258150017271953462884.jpg
Dalmatian Stone, etc.

Ahumada Municipality, Chihuahua, Mexico
00887520017271953497039.jpg
Dalmatian Stone, etc.

Ahumada Municipality, Chihuahua, Mexico
08864220017271953443428.jpg
Dalmatian Stone, etc.

Ahumada Municipality, Chihuahua, Mexico
06258150017271953462884.jpg
Dalmatian Stone, etc.

Ahumada Municipality, Chihuahua, Mexico
00887520017271953497039.jpg
Dalmatian Stone, etc.

Ahumada Municipality, Chihuahua, Mexico
08864220017271953443428.jpg
Dalmatian Stone, etc.

Ahumada Municipality, Chihuahua, Mexico
06258150017271953462884.jpg
Dalmatian Stone, etc.

Ahumada Municipality, Chihuahua, Mexico
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About Alkali-feldspar-graniteHide

A light-coloured granitoid (a coarse grained igneous rock composed mostly of quartz, alkali-feldspar and sodic plagioclase), where plagioclase is less than 10% of the total feldspar on the QAPF diagram.


Unique IdentifiersHide

Mindat ID:
48131
Long-form identifier:
mindat:1:1:48131:7

Classification of Alkali-feldspar-graniteHide

QAPF_P_2.png

Rocks in section 2 of the QAPF diagram.

Sub-divisions of Alkali-feldspar-graniteHide

Mineralogy of Alkali-feldspar-graniteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Alkali FeldsparA subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium.
Silica > QuartzSiO2
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Feldspar > Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Mica > BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Mica > MuscoviteKAl2(AlSi3O10)(OH)2

Age distributionHide

Recorded ages:
Eoarchean to Neogene : 4000 Ma to 20.7 ± 1.4 Ma - based on 15 recorded ages.
Sample ages:
Sample IDRecorded ageGeologic TimeDating method
1At least 145 MaLate Jurassic
220.7 ± 1.4 MaMioceneK-Ar
325 ± 0.9 MaOligoceneK-Ar
4100.5 to 66.0 MaLate/Upper CretaceousMid to Late Cretaceous by comparison with other granites in the vicinity
5108 MaEarly/Lower CretaceousRb-Sr whole rock
6139.7 ± 9 MaEarly/Lower CretaceousRb-Sr
7229 ± 12 MaLate/Upper TriassicRb-Sr whole rock
8253 MaLopingian
9276 ± 7 MaCisuralianRb-Sr isochron
10277 ± 3 MaCisuralianRb-Sr isochron
11587 ± 8 MaEdiacaranPb isochron
12587 ± 8 MaEdiacaranPb isochron
13740 ± 30 MaTonian
144000 to 2500 MaArchean
Sample references:
IDLocalityReferenceNotes
1Socotra Island, Aden Governorate, Yemen
doi.org/10.1144/gsjgs.125.1.0413
2Jibisa Ring Complex, Marsabit County, Kenya
Key, R. M., & Watkins, R. T. (1988). Geology of the Sabarei area. Republic of Kenya Ministry of Environment and Natural Resources, Mines and Geological Department Report, 111.
3Affara Dara Peralkaline Granite, Kilbet Rasu, Afar Region, Ethiopia
Barberi, F., Borsi, S., Ferrara, G., Marinelli, G., Santacroce, R., Tazieff, H., & Varet, J. (1972). Evolution of the Danakil Depression (Afar, Ethiopia) in light of radiometric age determinations. The Journal of Geology, 80(6), 720-729. doi.org/10.1086/627797
4Fleming Glacier Granite, West Antarctica, Antarctica
Leat, P. T., Flowerdew, M. J., Riley, T. R., Whitehouse, M. J., Scarrow, J. H., & Millar, I. L. (2009). Zircon U-Pb dating of Mesozoic volcanic and tectonic events in north-west Palmer Land and south-west Graham Land, Antarctica. Antarctic Science, 21(6), 633-641.
5Kulongshan, Fengning County, Chengde, Hebei, China
Zhongxin, Y. U. A. N., & Ge, B. A. I. (1998). Spatial Distribution and Ages of Alkaline Intrusive Rocks in China and Related Tectonics. Acta Geologica Sinica?English Edition, 72(4), 363-381.
6Nigrub El Tahtani Intrusion, Red Sea 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.
7Dawangzhezi, Shangzhi City, Harbin, Heilongjiang, China
Wu, Fu-yuan, Sun, De-you, Li, Huimin, Jahn, Bor-ming, Wilde, S. (2002) A-type granites in northeastern China: age and geochemical constraints on their petrogenesis. Chemical Geology, 187 (1) 143-173 doi:10.1016/s0009-2541(02)00018-9
8Bulgen, Qinghe Co., Altay Prefecture, Ili Kazakh Autonomous Prefecture, Xinjiang, China
Hu, A. (1995). The isotopic chronological scale of major geological events in northern Xinjiang, China. Geochimica, 24, 20-31.
9Zuhengdeleng, Sonid Left Banner, Xilingol League, Inner Mongolia, China
Dawei, H., Weijui, C., Huaizeng, H., Yijun, X., Haiming, X., & Manyuan, J. (1994). The Permian alkaline granites in central Inner Mongolia and their geodynamic significance. Journal of Southeast Asian Earth Sciences, 10(3-4), 169-176.
Fine-grained porphyritic peralkaline granites
10Zhanawula, Abag Banner, Xilingol League, Inner Mongolia, China
Dawei, H., Weijui, C., Huaizeng, H., Yijun, X., Haiming, X., & Manyuan, J. (1994). The Permian alkaline granites in central Inner Mongolia and their geodynamic significance. Journal of Southeast Asian Earth Sciences, 10(3-4), 169-176.
11Silsilah Deposit, Ha'il Region, Saudi Arabia
Du Bray, E. A. (1988). Geology of the Silsilah ring complex and associated tin mineralization, Kingdom of Saudi Arabia. USGS, Professional Paper, 1459, 1-47.
12  "  "
Du Bray, E. A. (1988). Geology of the Silsilah ring complex and associated tin mineralization, Kingdom of Saudi Arabia. USGS, Professional Paper, 1459, 1-47.
13Munnar metacarbonate occurrences, Idukki district, Kerala, India
Santosh, M., Thampi, P. K., Iyer, S. S., Vasconcellos, Marina B. A. (1987) Rare Earth Element Geochemistry of the Munnar Carbonatite, Central Kerala. Journal of the Geological Society of India, 29 (3). 335-343
14Dancherla Complex, Anantapur District, Andhra Pradesh, India
Suresh, G., Ananthanarayana, R., Hanumanthu, R. C., Ghosh, S., Kumar, A. A., & Reddy, K. V. S. (2010). Geology of Pulikonda and Dancherla Alkaline Complexes, Andhra Pradesh. Journal of the Geological Society of India, 75(4), 576-595.

Synonyms of Alkali-feldspar-graniteHide

Internet Links for Alkali-feldspar-graniteHide

References for Alkali-feldspar-graniteHide

Reference List:
Quick NavTopAbout Alkali-feldspar-graniteUnique IdentifiersClassification Sub-divisions Mineralogy Age distributionSynonymsInternet Links References
 
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