Monzonite
A rock classification type
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About Monzonite
Name:
Monzonite was originally named after the Monzoni mountain range in Val di Fassa (Trento Province, Italy).
A coarse-grained igneous rock containing almost equal amounts of alkali feldspar and plagioclase, and thus intermediate between syenite and diorite. Quartz is minor or absent. Either hornblende or diopside, or both, are present and biotite is a common constituent. Accessories are apatite, zircon, sphene, and opaque oxides.
The intrusive equivalent of latite.
Synonym of: syenodiorite.
The intrusive equivalent of latite.
Synonym of: syenodiorite.
Unique Identifiers
Mindat ID:
48196
Long-form identifier:
mindat:1:1:48196:4
Classification of Monzonite
Monzonite is in section 8 of the QAPF diagram.
Sub-divisions of Monzonite
Mineralogy of Monzonite
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. |
| Feldspar > Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
| Amphibole | A petrological term for Amphibole Supergroup. |
| Pyroxene | A petrological term for Pyroxene Group. |
Age distribution
Recorded ages:
Phanerozoic : 300 ± 6 Ma to 84 Ma - based on 7 recorded ages.
Sample ages:
| Sample ID | Recorded age | Geologic Time | Dating method |
|---|---|---|---|
| 1 | 84 Ma | Late/Upper Cretaceous | K-Ar |
| 2 | 129.9 ± 0.8 Ma | Early/Lower Cretaceous | LA-ICP-MS zircon U-Pb |
| 3 | 132 Ma | Early/Lower Cretaceous | |
| 4 | 134.8 Ma | Early/Lower Cretaceous | K-Ar whole rock |
| 5 | 135 Ma | Early/Lower Cretaceous | Rb-Sr whole rock |
| 6 | 300 ± 6 Ma | Pennsylvanian |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Nemuro peninsula occurrence, Nemuro City, Nemuro Subprefecture, Hokkaidō Prefecture, Japan | Least altered differentiated dolerite-monzonite | |
| 2 | Longbaoshan intrusion, Lanling County, Linyi, Shandong, China | ||
| 3 | Zijinshan Complex, Xing County, Lüliang, Shanxi, China | ||
| 4 | " " | ||
| 5 | " " | ||
| 6 | Huangyangshan, Changji Autonomous Prefecture, Xinjiang, China |
Synonyms of Monzonite
Syenodiorite (in part)
Common Associates
Associations Based on Photo Data:
| 6 photos of Monzonite associated with Orthoclase | K(AlSi3O8) |
| 6 photos of Monzonite associated with 'Labradorite' | (Ca,Na)[Al(Al,Si)Si2O8] |
| 6 photos of Monzonite associated with Hornblende Root Name Group | ◻Ca2(C2+4C3+)(AlSi7O22)W2 |
| 4 photos of Monzonite associated with Quartz | SiO2 |
| 4 photos of Monzonite associated with Titanite | CaTiO(SiO4) |
| 4 photos of Monzonite associated with 'Apatite' | Ca5(PO4)3A |
| 1 photo of Monzonite associated with Microcline | K(AlSi3O8) |
| 1 photo of Monzonite associated with Azurite | Cu3(CO3)2(OH)2 |
Internet Links for Monzonite
mindat.org URL:
https://www.mindat.org/min-48196.html
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References for Monzonite
Reference List:
Almenningen Quarry, Tvedalen, Larvik Commune, Vestfold, Norway