Anortosit
Anortosit adalah batuan beku faneritik yang intrusif dan dicirikan dengan dominansi plagioklas felspar (90-100%) dan komponen mafik sedikit (0-10%). Piroksen, ilmenit, magnetit, dan olivin adalah mineral-mineral mafik yang paling sering hadir.
 Anortosit dari Distrik salem, Tamil Nadu | |
| Mineral utama: | Plagioklas |
|---|---|
| Mineral sekunder: | Mineral-mineral mafik |
| Jenis batuan: | Batuan beku |
Anortosit di muka bumi dapat dibagi menjadi dua: Anortosit proterozoikum (disebut juga tipe masif anortosit) dan juga Anortosit tipe arkean. Kedua tipe ini memiliki keterjadian yang berbeda, dan muncul di periode-periode yang berbeda di sejarah bumi, dan diperkirakan memiliki asal yang berbeda.
Anortosit bulan merupakan area berwarna terang di permukaan bulan dan telah banyak diteliti oleh para ahli.[1]
Lihat juga sunting
Referensi sunting
Bibliografi sunting
- Bédard, Jean H. (2001). "Parental magmas of the Nain Plutonic Suite anorthosites and mafic cumulates: a trace element modelling approach". Contributions to Mineralogy and Petrology. 141 (6): 747–771. Bibcode:2001CoMP..141..747B. doi:10.1007/s004100100268.
- Emslie, R. F. (1 May 1975). "Pyroxene megacrysts from anorthositic rocks: new clues to the sources and evolution of the parent magmas". Canadian Mineralogist. 13 (2): 138–145. ISSN 0008-4476.
- Emslie, R. F.; Stirling, J. A. R. (1 December 1993). "Rapakivi and related granitoids of the Nain Plutonic Suite: geochemistry, mineral assemblages and fluid equilibria". Canadian Mineralogist. 31 (4): 821–847. ISSN 0008-4476.
- Emslie, R. F.; Hamilton, M. A.; Theriault, R. J. (1994). "Petrogenesis of a Mid-Proterozoic Anorthosite-Mangerite-Charnockite-Granite (AMCG) Complex: Isotopic and Chemical Evidence from the Nain Plutonic Suite". Journal of Geology. 102 (5): 539–558. Bibcode:1994JG....102..539E. doi:10.1086/629697.
- Longhi, John; Fram, M. S.; Vander Auwera, J.; Montieth, J. N. (1 October 1993). "Pressure effects, kinetics, and rheology of anorthositic and related magmas". American Mineralogist. 78 (9–10): 1016–1030.
- Norman, M. D.; Borg, L. E.; Nyquist, L. E.; Bogard, D. D. (2003). "Chronology, geochemistry, and petrology of a ferroan noritic anorthosite clast from Descartes breccia 67215: Clues to the age, origin, structure, and impact history of the lunar crust". Meteoritics and Planetary Science. 38 (4): 645–661. Bibcode:2003M&PS...38..645N. doi:10.1111/j.1945-5100.2003.tb00031.x.
- Wood, J. A.; Dickey, J. S. Jr.; Marvin, U. B.; Powell, B. N. (1970). "Lunar Anorthosites". Science. 167 (3918): 602–604. Bibcode:1970Sci...167..602W. doi:10.1126/science.167.3918.602. PMID 17781512.
- Xue, S.; Morse, S. A. (1993). "Geochemistry of the Nain massif anorthosite, Labrador: Magma diversity in five intrusions". Geochimica et Cosmochimica Acta. 57 (16): 3925–3948. Bibcode:1993GeCoA..57.3925X. doi:10.1016/0016-7037(93)90344-V.
- Xue, S.; Morse, S. A. (1994). "Chemical characteristics of plagioclase and pyroxene megacrysts and their significance to the petrogenesis of the Nain Anorthosites". Geochimica et Cosmochimica Acta. 58 (20): 4317–4331. Bibcode:1994GeCoA..58.4317X. doi:10.1016/0016-7037(94)90336-0.
Pranaa luar sunting
- Anorthosite Complexes (web archive)
- How does anorthosite crystallize? Diarsipkan 2003-08-03 di Wayback Machine.
- History of the Emplacement and Deformation of Anorthosite Bodies in the Eastern Marcy Massif, Adirondacks Mountains, New York Diarsipkan 2011-05-14 di Wayback Machine.
- Anorthosite – Lunar Highland Rock Diarsipkan 2003-10-12 di Wayback Machine.
- Lunar Anorthosite Specimen 60025 Photomicrographs
- Mercury – Evidence for Anorthosite and Basalt from mid-Infrared Spectroscopy