硅鋁層

硅鋁層是地球化學中所指地球的大陸地殼岩石圈，得名於其主要構成化學元素硅與鋁。^[1]^[2]

也稱硅鋁層岩石為長英質，因為其包含很高比例的硅鋁長石礦物。^[3]

硅鋁層最初由愛德華·修斯在19世紀提出。已經被岩相、重力測量、地震證據所證實。^[4]

性質

硅鋁層的密度低(2700–2800 kg/m³^[5])。與硅鎂層分界面並不對應於康拉德不連續面。^[6] 而是相當隨意地設定為平均密度2800 kg/m³的地方。^[3]

根據地殼均衡理論^[7] 山脈既向下也向上擴展其岩石圈^[7]，因此大陸地殼的硅鋁層厚度從5 km到70 km。^[8]

^ Continental crust has been defined as That type of the Earth’s crust which underlies the continents and the continental shelves: it is equivalent to the sial. Neuendorf, Klaus K. E.; Mehl, James P.; Jackson, Julia A. (編). Glossary of Geology 5th. Alexandria, Virginia: American Geological Institute. 2005: 139. ISBN 978-3-540-27951-8.
^ Smith, Frederick Gordon. Physical Geochemistry. Reading, Massachusetts: Addison-Wesley. 1963: 379. OCLC 253612701.
^ ^3.0 ^3.1 Ritter, Michael E. Chapter EM: Earth Materials and Structure: The Earth's Interior: The Crust. The Physical Environment: An Introduction to Physical Geography. 2006. （原始內容存檔於11 November 2007）.
^ Kuenen, Philip Henry. Marine Geology. New York: Wiley. 1950: 117. OCLC 489742.
^ Fairbridge, Rhodes W. (編). The Encyclopedia of Atmospheric Sciences and Astrogeology. New York: Reinhold Publishing. 1967: 323. OCLC 430153.
^ Monastersky, Richard. Inner Space. Science News. 1989, 136 (17): 266–268, page 266. JSTOR 3973827. doi:10.2307/3973827.
^ ^7.0 ^7.1 Bridges, Edwin Michael. World Geomorphology. Cambridge, England: Cambridge University Press. 1990: 13. ISBN 978-0-521-38343-1.
^ Lliboutry, Luis. Quantitative Geophysics and Geology. London: Springer-Praxis. 2000: 152. ISBN 978-1-85233-115-3.

Bates, R.L., and Jackson, J.A., (1987) Glossary of geology American Geological Institute, Alexandria, Virginia.
Dilek, Y. and Newcomb, S. (eds.) (2003) Ophiolite Concept and the Evolution of Geological Thought Geological Society of America Special Paper 373, Boulder, Colorado.