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Gabbro

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A gabbroid composed of 10-90% Ca-dominant plagioclase and >5% clinopyroxene.
A group of basic intrusive igneous rocks composed principally of basic plagioclase (commonly labradorite or bytownite) and clinopyroxene (augite), with or without olivine and orthopyroxene; also, any member of that group. It is the approximate coarse grained/intrusive equivalent of basalt. Apatite, magnetite and ilmenite are common accessory minerals. Commonly dark-colored.


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Classification of GabbroHide

Sub-divisions of GabbroHide

Mineralogy of GabbroHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > PlagioclaseA petrological term for Albite-Anorthite Series.
MaficsA 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 > HornblendeAn informal name for dark green to black amphiboles, mostly ferro-hornblende or ...
Mica > BiotiteA series or subgroup of the Mica Group.

Age informationHide

Age range:
Paleozoic : 419.2 ± 3.2 Ma to 305.9 ± 3.5 Ma - based on data given below.
Sample ages:
Sample IDRecorded ageGeologic TimeDating method
1305.9 ± 3.5 MaPennsylvanianRe-Os
2419.2 ± 3.2 to 358.9 ± 0.4 MaDevonian
Sample references:
IDLocalityReference
1Huangshandong Cu-Ni-PGE deposit, Huangshan-Jing'erquan ore belt, Hami Co., Hami Prefecture, Xinjiang Autonomous Region, ChinaJingwen, 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. Acta Geologica Sinica?English Edition, 77(2), 220-226.
2Lizard Complex, Lizard Peninsula, Cornwall, England, UKStyles, 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), 092-098.

Synonyms of GabbroHide

Other Language Names for GabbroHide

Internet Links for GabbroHide

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