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Lamprophyre

A rock classification type
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01441920017272412211531.jpg
Lamprophyre, etc.

Palafrugell, Girona, Catalonia, Spain
05067510017658013926809.jpg
Camptonite, etc.

Franklin Mine, Franklin, Sussex County, New Jersey, USA
03192310017361052377060.jpg
Lamprophyre

Ophir Hill Consolidated Mine, Ophir, Ophir Mining District, Tooele County, Utah, USA
01671470017271952559097.jpg
Lamprophyre, etc.

Palafrugell, Girona, Catalonia, Spain
07546410017657636734405.jpg
Camptonite, etc.

Franklin Mine, Franklin, Sussex County, New Jersey, USA
05465710017361052369260.jpg
Lamprophyre

Ophir Hill Consolidated Mine, Ophir, Ophir Mining District, Tooele County, Utah, USA
01671470017271952559097.jpg
Lamprophyre, etc.

Palafrugell, Girona, Catalonia, Spain
05067510017658013926809.jpg
Camptonite, etc.

Franklin Mine, Franklin, Sussex County, New Jersey, USA
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About LamprophyreHide

A group of hypabyssal igneous rocks characterised by abundant primary hydrous silicates (usually amphiboles or biotite) in phenocrysts and/ or groundmass, lacking felsic phenocrysts, and usually occurring in dykes. They have widely varying origin and compositions, commonly alkaline and basic to ultrabasic.

They are dark-colored and porphyritic, characterized by panidiomorphic texture, and a high percentage of mafic minerals (esp. biotite, hornblende, and pyroxene), which form the phenocrysts. The fine-grained groundmass contains the same mafic minerals in addition to feldspars and/or feldspathoids. Most lamprophyres are highly altered.

They are commonly associated with carbonatites.


Unique IdentifiersHide

Mindat ID:
48064
Long-form identifier:
mindat:1:1:48064:6

Classification of LamprophyreHide

Sub-divisions of LamprophyreHide

Mineralogy of LamprophyreHide

Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
AmphiboleA petrological term for Amphibole Supergroup.
Feldspar > Alkali Feldspar > K FeldsparPotassium-dominant feldspars with variable crystal symmetry and Al-Si ordering state; they are a subgroup of ...
Feldspar > Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
FeldspathoidA family of rock-forming minerals consisting of aluminosilicates of sodium, potassium, or calcium and having too ...
MicaA petrological term for Mica Group.

Age distributionHide

Recorded ages:
Phanerozoic : 296 ± 5 Ma to 22 Ma - based on 15 recorded ages.
Sample ages:
Sample IDRecorded ageGeologic TimeDating method
122 MaMioceneK-Ar
222.78 ± 0.88 MaMioceneK-Ar
395.2 ± 4.8 MaLate/Upper CretaceousK-Ar
4107 ± 4 MaEarly/Lower CretaceousK-Ar
5110 ± 3 to 108 ± 3 MaEarly/Lower Cretaceous
6183.2 ± 2.2 MaEarly JurassicAr-Ar
7229 MaLate/Upper TriassicRb-Sr whole rock
8235 MaLate/Upper TriassicK-Ar
9245 ± 12 MaMiddle TriassicK-Ar
10279 ± 6 MaCisuralianK-Ar
11291 ± 6 MaCisuralian
12296 ± 5 MaCisuralianK-Ar
Sample references:
IDLocalityReferenceNotes
1Shaksgam valley, Tashiku'ergan Co., Kashi Prefecture, Xinjiang, China
Rex, A. J., Searle, M. P., Tirrul, R., Crawford, M. B., Prior, D. J., Rex, D. C., & Barnicoat, A. (1988). The geochemical and tectonic evolution of the central Karakoram, north Pakistan. Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 326(1589), 229-255.
2Borač Volcanic Complex, Gornji Milanovac, Moravica District, Central Serbia, Serbia
Cvetković, V.; Prelević, D.; Downes, H.; Jovanović, M.; Vaselli, O.; Pécskay, Z. (2004) Origin and geodynamic significance of Tertiary postcollisional basaltic magmatism in Serbia (central Balkan Peninsula). Lithos, 73 (3-4). 161-186 doi:10.1016/j.lithos.2003.12.004
minette inclusion in quartz latite
3Tokati rhyolite dikes, Nakagawa District, Tokachi Subprefecture, Hokkaidō Prefecture, Japan
OWADA, M., NANAYAMA, F., SHIMURA, T., & Osanai, Y. (1992). Lamprophyre from the Nakanogawa group in the central zone of Hokkaido, northern Japan. Journal of Mineralogy, Petrology and Economic Geology, 87(2), 62-67.
4Swangkre, West 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.
5Prince Charles Mountains, Mac Robertson Land, East Antarctica, Antarctica
Sheraton, J. W. (1983). Geochemistry of mafic igneous rocks of the northern Prince Charles Mountains, Antarctica. Journal of the Geological Society of Australia, 30(3-4), 295-304.
6Mount Campleman, Pensacola Mountains, Queen Elizabeth Land, East Antarctica, Antarctica
Leat, P. T., Riley, T. R., Storey, B. C., Kelley, S. P., & Millar, I. L. (2000). Middle Jurassic ultramafic lamprophyre dyke within the Ferrar magmatic province, Pensacola Mountains, Antarctica. Mineralogical Magazine, 64(1), 95-111.
7Datong Occurrence, Pingcheng District, Datong, Shanxi, China
Shao, J. A., Zhang, Y. B., Zhang, L. Q., Mu, B. L., Wang, P. Y., & Guo, F. (2003). Early Mesozoic dike swarms of carbonatites and lamprophyres in Datong area. Acta Petrologica Sinica, 19(1), 93-104.
Based on 2 whole rock samples, biotite and feldspar.
8Orkney Islands Dike Swarm, Mainland Island, Orkney Islands, Scotland, UK
Halliday, A. N., McAlpine, A., & Mitchell, J. G. (1977). The age of the Hoy lavas, Orkney. Scottish Journal of Geology, 13(1), 43-52. doi.org/10.1144/sjg13010043
9  "  "
Brown, J. F. (1975). Potassium-Argon evidence of a Permian age for the camptonite dykes: Orkney. Scottish Journal of Geology, 11(3), 259-262. doi.org/10.1144/sjg11030259
10Exeter Volcanic Series, Exeter, Devon, England, UK
Miller, John A., Shibata, Ken, Munro, Mary (1962) The Potassium-Argon Age of the Lava of Killerton Park, Near Exeter. Geophysical Journal of the Royal Astronomical Society, 6 (3). 394-396 doi:10.1111/j.1365-246x.1962.tb00360.x
11  "  "
Thorpe, R. S., Cosgrove, M. E., van Calsteren, P. W. C. (1986) Rare earth element, Sr- and Nd-isotope evidence for petrogenesis of Permian basaltic and K-rich volcanic rocks from south-west England. Mineralogical Magazine, 50 (357) 481-489 doi:10.1180/minmag.1986.050.357.11
12  "  "
Thorpe, R. S., Cosgrove, M. E., van Calsteren, P. W. C. (1986) Rare earth element, Sr- and Nd-isotope evidence for petrogenesis of Permian basaltic and K-rich volcanic rocks from south-west England. Mineralogical Magazine, 50 (357) 481-489 doi:10.1180/minmag.1986.050.357.11

Chemical AnalysisHide

Oxide wt%:
 12
SiO243.14 %39.75 %
Al2O312.07 %15.11 %
TiO23.11 %3.97 %
Fe2O32.00 %2.00 %
FeO10.97 %11.42 %
MgO10.32 %6.45 %
MnO0.17 %0.22 %
Na2O2.93 %3.66 %
CaO12.72 %13.17 %
K2O0.95 %1.8 %
P2O50.40 %1.19 %
Total:98.78 %98.74 %
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%.
2  "  "
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%.

Other Language Names for LamprophyreHide

German:Lamprophyr

Common AssociatesHide

Associations Based on Photo Data:
2 photos of Lamprophyre associated with CalciteCaCO3
2 photos of Lamprophyre associated with 'Leucogranite'
1 photo of Lamprophyre associated with AndraditeCa3Fe3+2(SiO4)3
1 photo of Lamprophyre associated with 'Marble'
1 photo of Lamprophyre associated with 'Skarn'
1 photo of Lamprophyre associated with Silvialite(Ca,Na)4(Al6Si6O24)(SO4,CO3)

Internet Links for LamprophyreHide

References for LamprophyreHide

Quick NavTopAbout LamprophyreUnique IdentifiersClassification Sub-divisions Mineralogy Age distributionChemical AnalysisOther LanguagesCommon AssociatesInternet Links References
 
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