橄长岩

橄长岩英語:) 是一種鎂鐵質侵入岩類型。 它主要由變量的橄欖石和鈣質斜長石以及少量輝石組成。 它是富含橄欖石的斜長岩,或貧輝石的輝長岩。 然而,與輝長岩不同的是,當橄欖岩進行部分熔融時,其成分上和和橄长岩不同。 因此,橄长岩必然是從熔體中分離出來的火成堆積岩 [1]

橄长岩
火成岩
阿波羅 17 著陸點的橄长岩76535
成分
橄欖石, 鈣質 斜長石, 及少量輝石

產狀

橄长岩通常產於層狀侵入岩中,例如西澳大利亞太古宙 Windimurra 侵入體、拉布拉多北部的 Voisey's Bay 鎳-銅-鈷岩漿硫化物礦床[2],蒙大拿州斯蒂爾沃特火成岩複合體、北美德盧斯複合體 Midcontinent Rift[3],和蘇格蘭 Rùm 島的第三紀朗姆層狀侵入岩 [4]。在南非 Bushveld 火成岩複合體的 Merensky 礁和康沃爾的Lizard複合體中也發現了橄长岩[5]

參考文獻

  1. Emeleus, C. H.; Troll, V. R. (2014-08-01). "The Rum Igneous Centre, Scotland". Mineralogical Magazine. 78 (4): 805–839. doi:10.1180/minmag.2014.078.4.04. ISSN 0026-461X.
  2. Sulphide segregation in the Mushuau Intrusion of northern Labrador as recorded by nickel-in-olivine magmatic stratigraphy abstract, BRADLEY, L.A. and SYLVESTER, P.J., Department of Earth Sciences, Memorial University of Newfoundland, St. John's, NF, A1B 3X5
  3. Paces, James B.; Miller, James D. (1993). "Precise U-Pb ages of Duluth Complex and related mafic intrusions, northeastern Minnesota: Geochronological insights to physical, petrogenetic, paleomagnetic, and tectonomagmatic processes associated with the 1.1 Ga Midcontinent Rift System". Journal of Geophysical Research: Solid Earth. 98 (B8): 13997–14013. doi:10.1029/93JB01159. ISSN 0148-0227.
  4. http://www.turnstone.ca/rhumal.htm 页面存档备份,存于 Troctolite (allivalite): Isle of Rhum, northwestern Scotland
  5. The Lizard
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