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角岩.
角岩(英语:Hornfels)是一组接触变质岩的组名,是和火成岩接触而造成的高温变质岩。具坚硬、易碎,坚韧和耐用特点。这些特性是由于片状或棱柱状细粒晶体呈无规则排列[1] [2] [3]。
角岩的原岩,有砂岩、页岩、板岩和石灰岩等。经过变质后。它们原有的层理或解理面会消失,当和火山活动带来的热液接触时,会造成交代作用(英语:metasomatism),原岩的成分会变化[4]。角岩最常见于上地壳或中地壳的花岗岩侵入体的周边。最常见的角岩是黑云母角岩,呈深褐色至黑色,含大量闪亮的黑色云母小晶体[5]。
参考文献
- ^ Yardley, Bruce W.D. (1989). An introduction to metamorphic petrology. Harlow, Essex, England: Longman Scientific & Technical. pp. 12, 26. ISBN 0582300967
- ^ Blatt, Harvey; Tracy, Robert J. (1996). Petrology : igneous, sedimentary, and metamorphic (2nd ed.). New York: W.H. Freeman. pp. 367, 512. ISBN 0716724383.
- ^ Philpotts, Anthony R.; Ague, Jay J. (2009). Principles of igneous and metamorphic petrology (2nd ed.). Cambridge, UK: Cambridge University Press. pp. 422
, 428. ISBN 9780521880060
- ^ Harry, W. T. (December 1952). "Basic hornfels at a gabbro contact near Carlingford, Eire". Geological Magazine. 89 (6): 411–416. Bibcode:1952GeoM...89..411H. doi:10.1017/S0016756800068114.
- ^ Flett, John Smith (1911). "Hornfels" . In Chisholm, Hugh (ed.). Encyclopædia Britannica. 13(11th ed.). Cambridge University Press. pp. 710–711
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