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Gabbroid

A rock classification type
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03527530017367658701064.jpg
Troctolite, etc.

Gabbro Quarry, Radau valley, Bad Harzburg, Goslar District, Lower Saxony, Germany
04901580017523509985643.jpg
Troctolite

Tatern quarry, Radau valley, Bad Harzburg, Goslar District, Lower Saxony, Germany
02313520017362804582981.jpg
Gabbro

Sandvikhaugane, Flemsøya-Skuløya, Haram, Ålesund, Møre og Romsdal, Norway
04516770017364458476111.jpg
Troctolite, etc.

Gabbro Quarry, Radau valley, Bad Harzburg, Goslar District, Lower Saxony, Germany
09357310017522593017947.jpg
Troctolite

Tatern quarry, Radau valley, Bad Harzburg, Goslar District, Lower Saxony, Germany
02057480017272426474275.jpg
Gabbro

Sandvikhaugane, Flemsøya-Skuløya, Haram, Ålesund, Møre og Romsdal, Norway
03527530017367658701064.jpg
Troctolite, etc.

Gabbro Quarry, Radau valley, Bad Harzburg, Goslar District, Lower Saxony, Germany
04901580017523509985643.jpg
Troctolite

Tatern quarry, Radau valley, Bad Harzburg, Goslar District, Lower Saxony, Germany
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About GabbroidHide

A field term for coarse-grained crystalline rocks with <90% mafics, and calcic plagioclase dominant.


Unique IdentifiersHide

Mindat ID:
48265
Long-form identifier:
mindat:1:1:48265:3

Classification of GabbroidHide

QAPF_P_9,_9star,_9-,10,10star,10-.png


float='left'>Gabbroic rocks are in sections 9,9*,9',10,10* and 10' of the QAPF diagram.

Sub-divisions of GabbroidHide

Mineralogy of GabbroidHide

Essential minerals - these are minerals that are required within the classification of this rock:
Calcic plagioclaseA petrological term for plagioclase series feldspars dominant in calcium.
Mafic mineralsA petrological term for dark, rock-forming minerals rich in magnesium and/or iron.
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Amphibole > HornblendeAnCa2(Z2+5-mZ3+m)(Si8-(n+m)Al(n+m))(OH,F,Cl)2
Mica > BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2

Age distributionHide

Recorded ages:
Neochaotian to Quaternary : ~4600 Ma to 0 Ma - based on 19 recorded ages.
Sample ages:
Sample IDRecorded ageGeologic TimeDating method
112.8 ± 1.3 MaMioceneK-Ar
216 ± 1 MaMioceneK-Ar
343 ± 2 MaEoceneK-Ar
453.1 ± 4.2 to 44 ± 2 MaEoceneK-Ar for the gabbro
590 ± 2 MaLate/Upper CretaceousK-Ar
692.5 ± 3 to 83 ± 3 MaLate/Upper CretaceousK-Ar
7125 MaEarly/Lower CretaceousK-Ar
8130 to 124 MaEarly/Lower CretaceousK-Ar
9136 ± 4 to 110 ± 9 MaEarly/Lower CretaceousK-Ar
10140 ± 3 to 135 ± 3 MaEarly/Lower CretaceousK-Ar
11229 ± 5 MaLate/Upper TriassicK-Ar
12258.8 ± 2.3 MaLopingianU-Pb zircon from gabbro
13261 ± 2 MaGuadalupianU-Pb
14305.9 ± 3.5 MaPennsylvanianRe-Os
15419.2 ± 3.2 to 358.9 ± 0.4 MaDevonian
162701 ± 8 MaNeoarcheanSm-Nd
17~4600 to 541 ± 1.0 MaPrecambrian
Sample references:
IDLocalityReferenceNotes
1Inaccessible Island, Tristan da Cunha Archipelago, Saint Helena, Ascension and Tristan da Cunha
Chevallier, L., Rex, D. C., Verwoerd, W. J. (1992) Geology and geochronology of Inaccessible Island, South Atlantic. Geological Magazine, 129 (1) 1-16 doi:10.1017/s0016756800008098
2Campbell Island, Campbell Island group, New Zealand Outlying Islands, New Zealand
Adams, C.J., Morris, P.A., Beggs, J.M. (1979) Age and correlation of volcanic rocks of Campbell Island and Metamorphic basement of the Campbell Plateau, South-west Pacific. New Zealand Journal of Geology and Geophysics, 22(6), 679-691. doi.org/10.1080/00288306.1979.10424176
3Nlonako 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.
4Dorrel Rock, Marie Byrd Land, West Antarctica, Antarctica
LeMasurier, W. E., & Rex, D. C. (1982). Volcanic record of Cenozoic glacial history in Marie Byrd Land and western Ellsworth Land: Revised chronology and evaluation of tectonic factors. Antarctic Geoscience, 89, 725-734.
5
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.
6Zidarovo complex, Zidarovo, Sozopol Municipality, Burgas Province, Bulgaria
Kamenov, B., Tarassova, E., Nedialkov, R., Amov, B., Monchev, P., & Mavroudchiev, B. (2000). New radiometric data from Late Cretaceous plutons in Eastern Srednogorie area, Bulgaria. Bulletin of the Geological Institute, Series: Geochemistry, Mineralogy and Petrology, 37, 13-24.
7Doros Intrusion, Khorixas, Kunene Region, Namibia
Siedner, G., Miller, J.A. (1968) K-Ar age determinations on basaltic rocks from south-west Africa and their bearing on continental drift. Earth and Planetary Science Letters, 4 (6). 451-458 doi:10.1016/0012-821x(68)90023-x
8  "  "
Siedner, Gerard, Mitchell, John G. (1976) Episodic mesozoic volcanism in Namibia and Brazil: A K-Ar Isochron study bearing on the opening of the south atlantic. Earth and Planetary Science Letters, 30 (2). 292-302 doi:10.1016/0012-821x(76)90256-9
from the inner ring dike
9Qarnei Ramon, Makhtesh Ramon, Ramat Negev Regional Council, Beersheba Subdistrict, Southern District, Israel
Lang, B., Hebeda, E. H., Priem, H. N. A., Verdurmen, E. A., & Steinitz, G. (1988). K-Ar and Rb-Sr ages of early Cretaceous magmatic rocks from Makhtesh Ramon, southern Israel. Israel Journal of Earth-Sciences, 37(2-3), 65-72.
11 samples of gabbroic rocks from the main laccolith
10Nigrub El Fogani Complex, 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.
11El Gezira Complex, 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.
12Taihe intrusion, Xichang County, Liangshan Yi, Sichuan, China
Zhong, H., Campbell, I. H., Zhu, W. G., Allen, C. M., Hu, R. Z., Xie, L. W., & He, D. F. (2011). Timing and source constraints on the relationship between mafic and felsic intrusions in the Emeishan large igneous province. Geochimica et Cosmochimica Acta, 75(5), 1374-1395.
13Baima V-Ti-Fe deposit, Miyi County, Panzhihua, Sichuan, China
Shellnutt, J. G., Zhou, M. F., & Zellmer, G. F. (2009). The role of Fe
14Huangshandong Cu-Ni-PGE deposit, Huangshan-Jing'erquan ore belt, Yizhou District, Hami Prefecture, Xinjiang, China
Jingwen, M., Jianmin, Y., Wenjun, Q., Andao, D., Zhiliang, W., & Chunming, H. (2003). Re?Os Age of Cu?Ni Ores from the Huangshandong Cu?Ni Sulfide Deposit in the East Tianshan Mountains and Its Implication for Geodynamic Processes.
15Lizard Complex, Cornwall, England, UK
Styles, M.T.; Cook, C.A.; Holdsworth, R.E. (2000) The geology of the Lizard complex; 100 years of progress. Geoscience in South-West England, 10 (1). 92-98
16Stillwater Complex, Montana, USA
https://doi.org/10.1016/0016-7037(79)90089-9
17Purimetla, Prakasam District, Andhra Pradesh, India
Leelanandam, C. (1989) The Prakasam Alkaline Province in Andbra Pradesh, India. Journal Geological Society of India, 34 (1). 25-45 doi:10.17491/jgsi/1989/340102

Synonyms of GabbroidHide

Internet Links for GabbroidHide

References for GabbroidHide

Reference List:
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