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Coarse-grained-ultramafic-rock

A rock classification type
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03902680017271952819060.jpg
Lherzolite

Peridot Mesa, San Carlos, Gila County, Arizona, USA
04769240017272472737129.jpg
Dunite, etc.

Gusdal Olivine Pit, Almklovdalen, Vanylven, Møre og Romsdal, Norway
06114500017272022117372.jpg
Dunite, etc.

Dun Mountain, Nelson Region, New Zealand
03902680017271952819060.jpg
Lherzolite

Peridot Mesa, San Carlos, Gila County, Arizona, USA
04769240017272472737129.jpg
Dunite, etc.

Gusdal Olivine Pit, Almklovdalen, Vanylven, Møre og Romsdal, Norway
06114500017272022117372.jpg
Dunite, etc.

Dun Mountain, Nelson Region, New Zealand
00021350017271952866833.jpg
Lherzolite

Peridot Mesa, San Carlos, Gila County, Arizona, USA
04769240017272472737129.jpg
Dunite, etc.

Gusdal Olivine Pit, Almklovdalen, Vanylven, Møre og Romsdal, Norway
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About Coarse-grained-ultramafic-rockHide

A coarse-grained crystalline igneous rock composed mostly (>90%) of mafic minerals


Unique IdentifiersHide

Mindat ID:
50598
Long-form identifier:
mindat:1:1:50598:1

Classification of Coarse-grained-ultramafic-rockHide

TRI__45d62b89f1bfbd3bd8fb5e59c28ae239.png

Modal classification of ultramafic rocks (after Streckeisen, 1973)

TRI__a85a3952c86a41ec3c142287771f1356.png

Modal classification of ultramafic rocks (after Streckeisen, 1973)

Sub-divisions of Coarse-grained-ultramafic-rockHide

Mineralogy of Coarse-grained-ultramafic-rockHide

Essential minerals - these are minerals that are required within the classification of this rock:
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
OlivineCommonly used as a synonym for a member of the Fayalite-Forsterite Series, but more generally and properly ...
PyroxeneA petrological term for Pyroxene Group.

Age distributionHide

Recorded ages:
Neoproterozoic to Quaternary : 773 ± 18 Ma to 2.588 Ma - based on 16 recorded ages.
Sample ages:
Sample IDRecorded ageGeologic TimeDating method
15.332 to 2.588 MaCenozoic
273 to 66 MaLate/Upper CretaceousK-Ar
382.7 to 74.7 MaLate/Upper CretaceousK-Ar
486.9 to 78.5 MaLate/Upper CretaceousK-Ar
5107.2 ± 0.8 MaEarly/Lower CretaceousAr-Ar
6243 ± 10 MaMiddle TriassicSm-Nd isochron
7274.3 ± 2.2 MaCisuralianRe-Os
8334 MaMississippian
9402 to 380 MaDevonianK-Ar
10540 ± 39 to 521 ± 22 MaTerreneuvianSm-Nd and Rb-Sr internal isochron
11773 ± 18 MaTonianRb-Sr whole rock isochron
Sample references:
IDLocalityReferenceNotes
1Nepheline occurrence, Wuxi, Jiangsu, China
QI, Q. U., TAYLOR, L. A, ZHOU, X. (1995) Petrology and Geochemistry of Mantle Peridotite Xenoliths from SE China. Journal of Petrology, 36 (1) 55-79 doi:10.1093/petrology/36.1.55
2Tapira Complex, Tapira, Minas Gerais, Brazil
Orris, Greta J., Grauch, Richard I. (2002) Rare Earth Element Mines, Deposits, and Occurrences. Open-File Report 2002-189. US Geological Survey doi:10.3133/ofr02189
3Serra do Salitre carbonatite, Minas Gerais, Brazil
Orris, Greta J., Grauch, Richard I. (2002) Rare Earth Element Mines, Deposits, and Occurrences. Open-File Report 2002-189. US Geological Survey doi:10.3133/ofr02189
4  "  "
Orris, Greta J., Grauch, Richard I. (2002) Rare Earth Element Mines, Deposits, and Occurrences. Open-File Report 2002-189. US Geological Survey doi:10.3133/ofr02189
5Sung Valley complex, East Khasi Hills District, Meghalaya, India
Sarkar, A., Datta, A. K., Poddar, B. C., Bhattacharyya, B. K., Kollapuri, V. K., & Sanwal, R. (1996). Geochronological studies of Mesozoic igneous rocks from eastern India. Journal of Southeast Asian Earth Sciences, 13(2), 77-81.
pyroxenite and 2 phlogopite separates from carbonatite
6Fanshan Mine, Zhuolu County, Zhangjiakou, Hebei, China
Mu, B., Shao, J., Chu, Z., Yan, G., & Qiao, G. (2001). Sm
Whole rock samples and minerals
7Huangshandong 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.
8Luku Complex, Yanbian County, Panzhihua, Sichuan, China
Lin, C., LIu, Y., Wang, Z., & Hong, W. (1995). Rare element and rare-earth element deposits of China. Mineral deposits of China, 3, 226-279.
9Vuoriyarvi alkaline-ultrabasic massif, Northern Karelia, Murmansk Oblast, Russia
Orris, Greta J., Grauch, Richard I. (2002) Rare Earth Element Mines, Deposits, and Occurrences. Open-File Report 2002-189. US Geological Survey doi:10.3133/ofr02189
10Stjernøya Island, Alta, Troms og Finnmark, Norway
Cadow, Renate (1993) Sm-Nd and Rb-Sr ages of hornblende clinopyroxenite and metagabbro from the Lillebukt Alkaline Complex,Seiland Igneous Province. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 73 (4). 243-249
Hornblende clinopyroxenite
11Sevattur carbonatite complex, Krishnagiri District, Tamil Nadu, India
Kumar, A., & Gopalan, K. (1991). Precise Rb-Sr age and enriched mantle source of the Sevattur carbonatites, Tamil Nadu, South India. Current Science (Bangalore), 60(11), 653-655.

Chemical AnalysisHide

Oxide wt%:
 1
SiO241.4 %
Al2O38.06 %
TiO22.69 %
Fe2O32.00 %
FeO12.67 %
MgO15.32 %
MnO0.18 %
Na2O0.88 %
CaO14.98 %
K2O0.33 %
P2O50.08 %
Total:98.59 %
Sample references:
IDLocalityReferenceNotes
1Mont Royal, Montréal, Québec, Canada
Woussen, Gerard (1970) La geologie du complexe igne du Mont Royal [The geology of the Mount Royal igneous complex]. The Canadian Mineralogist, 10 (3). p.432-451.
Wet chemical analysis by G. Woussen and B.M.Gunn. The Fe2O3 percentage is arbitrarily set to 2%.

Synonyms of Coarse-grained-ultramafic-rockHide

Internet Links for Coarse-grained-ultramafic-rockHide

References for Coarse-grained-ultramafic-rockHide

Reference List:
Quick NavTopAbout Coarse-grained-ultramafic-rockUnique IdentifiersClassification Sub-divisions Mineralogy Age distributionChemical AnalysisSynonymsInternet Links References
 
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