A-type granite

A rock subtype

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A general term for granitoids typically occurring in rift zones and the interiors of stable continental plates. The prefix A stands for anorogenic. Usually mildly alkaline and K-rich.

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Unique IdentifiersHide

Mindat ID:

48128

Long-form identifier:

mindat:1:1:48128:3

GUID
(UUID V4):

3196c5e1-ae00-4387-ace6-78b5b7eed29e

Classification of A-type graniteHide

Rock
- Igneous rock
  - Normal crystalline igneous rock
    - Coarse-grained ("plutonic") crystalline igneous rock
      - Granitoid
        A-type granite

Rocks in sections 2,3,4 and 5 of the QAPF diagram.

Mineralogy of A-type graniteHide

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

Silica > Quartz

SiO₂

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

Feldspar > Alkali Feldspar	A subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium.
Feldspar > Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈

Internet Links for A-type graniteHide

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References for A-type graniteHide

Reference List:

Johansson, Åke. (2023) "A Tentative Model for the Origin of A-Type Granitoids" Minerals 13, no. 2: 236. https://doi.org/10.3390/min13020236

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