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La Aljorra Quarries, La Aljorra, Cartagena, Murcia, Spain
Canteras de la Aljorra, Cerro de la Cabezuela (Volcán de la Aljorra), La Aljorra, Cartagena, Murcia, España
Lamproites which outcrop a few hundred meters SW of the village of Los Nietos, in Diputación de La Aljorra, term City of Cartagena (Murcia). The intrusion is 600 m long and 350 m wide, and has intruded calcareous shists, deformed and fractured by the intrusion. By analogy with other lamproites in this area, the intrusion is of Neogene age (Pellicer, 1973).
The inner zone of the intrusion consists of a compact rock, with olivine phenocrysts that can reach a size of several millimeters, but usually are strongly altered to serpentine.
According to Pellicer (1973), olivine has a reduced content of forsterite, which indicates a fairly evolved intrusion. In the compact rock, there are also phenocrysts of diopside, sanidine and phlogopite. At the border of the intrusion, the lamproites becomes enriched in voids. The vesicles can reach ... metres in length, and contain various mineral species.
Mineral List
| 'Armalcolite-Pseudobrookite Series' Calcite Enstatite Fluorophlogopite | Hematite Ilmenite Magnetite Opal | Phlogopite Pseudobrookite Sanidine Tridymite | Warwickite |
13 entries listed. 12 valid minerals.
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References
- Anderson, A.T., Boyd, F.R., Bunch, T.E., Cameron, E.N., El Goresy, A., Finger, L.W. (1970): Armalcolite: A new mineral from the Apollo 11 samples. Geochimica et Cosmochimica Acta Supplement, Volume 1. Proceedings of the Apollo 11 Lunar Science Conference, 55-63.
- Bowles, J.F.W. (1988). Definition and range of composition of naturally occurring minerals with the pseudobrookite structure. Amer. Min., 73, 1377-1383.
- Brigatti, M.F., Contini, S., Capedri, S. & Poppi,
L. (1993): Crystal chemistry and cation ordering in pseudobrookite and armalcolite from Spanish lamproites. Eur. J. Mineral, 5, 73-84.
- Calvo, M. (2009): Minerales y Minas de España. Vol. IV, Óxidos e Hidróxidos. Escuela Técnica Superior de Ingenieros de Minas de Madrid - Fundación Gómez Pardo. 752 pp
- Calvo Sevillano, G., Viñals, J., Calvo Rebollar, M. (2009): Minerales de las Vesículas de las Rocas Lamproíticas del afloramiento de La Aljorra (Murcia). Macla (11), 43-44.
- Contini, S., Venturelli, G., Toscani, L., Capedri, S. & Barbieri, M. (1993): Cr-Zr-armalcolite-bearing lamproítes of Cancarix, SE Spain.
Min. Mag., 57, 203-216.
- Pellicer, M.J. (1973): Estudio petrológico y geoquímico de un Nuevo yacimiento de rocas lamproíticas situado en las proximidades de Aljorra (Murcia). Estud. Geol., 29, 99-106.
- Bowles, J.F.W. (1988). Definition and range of composition of naturally occurring minerals with the pseudobrookite structure. Amer. Min., 73, 1377-1383.
- Brigatti, M.F., Contini, S., Capedri, S. & Poppi,
L. (1993): Crystal chemistry and cation ordering in pseudobrookite and armalcolite from Spanish lamproites. Eur. J. Mineral, 5, 73-84.
- Calvo, M. (2009): Minerales y Minas de España. Vol. IV, Óxidos e Hidróxidos. Escuela Técnica Superior de Ingenieros de Minas de Madrid - Fundación Gómez Pardo. 752 pp
- Calvo Sevillano, G., Viñals, J., Calvo Rebollar, M. (2009): Minerales de las Vesículas de las Rocas Lamproíticas del afloramiento de La Aljorra (Murcia). Macla (11), 43-44.
- Contini, S., Venturelli, G., Toscani, L., Capedri, S. & Barbieri, M. (1993): Cr-Zr-armalcolite-bearing lamproítes of Cancarix, SE Spain.
Min. Mag., 57, 203-216.
- Pellicer, M.J. (1973): Estudio petrológico y geoquímico de un Nuevo yacimiento de rocas lamproíticas situado en las proximidades de Aljorra (Murcia). Estud. Geol., 29, 99-106.
External Links
- http://www.ehu.es/sem/macla_pdf/macla11/Macla11_43.pdf
- http://mineralespania-murcia.blogspot.com/search/label/Canteras%20de%20La%20Aljorra
- http://mineralespania-murcia.blogspot.com/search/label/Canteras%20de%20La%20Aljorra
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Locality Updated: Tamaiwa mine, Nantan City, Kyoto Prefecture, Kinki Region, Honshu Island, JapanFrom Hiroaki Tano, 22nd May 2013 03:20:42