角岩

角岩（英語：Hornfels）是一組接觸變質岩的組名，是和火成岩接觸而造成的高溫變質岩。具堅硬、易碎，堅韌和耐用特點。這些特性是由於片狀或棱柱狀細粒晶體呈無規則排列^[1] ^[2] ^[3]。

角岩的原岩，有砂岩、頁岩、板岩和石灰岩等。經過變質后。它們原有的層理或解理面會消失，當和火山活動帶來的熱液接觸時，會造成交代作用（英語：metasomatism），原岩的成分會變化^[4]。角岩最常見於上地殼或中地殼的花崗岩侵入體的周邊。最常見的角岩是黑雲母角岩，呈深褐色至黑色，含大量閃亮的黑色雲母小晶體^[5]。

參考文獻

^ 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

[”Yardley”-1] Yardley, Bruce W.D. (1989). An introduction to metamorphic petrology. Harlow, Essex, England: Longman Scientific & Technical. pp. 12, 26. ISBN 0582300967

[”Blatt”-2] Blatt, Harvey; Tracy, Robert J. (1996). Petrology : igneous, sedimentary, and metamorphic (2nd ed.). New York: W.H. Freeman. pp. 367, 512. ISBN 0716724383.

[”Philpotts”-3] 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”-4] 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,”-5] Flett, John Smith (1911). "Hornfels" . In Chisholm, Hugh (ed.). Encyclopædia Britannica. 13(11th ed.). Cambridge University Press. pp. 710–711

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