岩鞍

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地质剖面展示褶皱构造中的岩鞍状火成岩（红色）

岩鞍（英语：phacolith）是一种侵入火成岩的岩体，大致平行于层理面。 是一个透镜状岩体形成于背斜的顶部或向斜的槽谷[1]。 偶尔它能从背斜的顶部延伸到相邻的向斜的槽中，因此其横截面呈 S 形。 在褶皱的地形中，褶皱的背斜顶和向斜槽是减压区，因此利于岩浆侵入[2].

实例[编辑]

在新泽西州苏塞克斯县的富兰克林和汉堡地区[3]。

爱尔兰的奥美冥王星[4].

印度拉贾斯坦邦阿杰梅尔区巴亚兰附近[5].

英格兰什罗普郡的康登山[6].

参考文献[编辑]

  1. ^ Tyrrell, G.W. (1978). Forms and Structures of Igneous Rocks. In: The Principles of PETROLOGY. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-6026-1_2
  2. ^ E. J ENGEL, CELESTE G ENGEL; METASOMATIC ORIGIN OF LARGE PARTS OF THE ADIRONDACK PHACOLITHS. GSA Bulletin 1963;; 74 (3): 349–352. doi: https://doi.org/10.1130/0016-7606(1963)74[349:MOOLPO]2.0.CO;2
  3. ^ Baker, D.R.; Buddington, A.F. (1970). Geology and Magnetite Deposits of the Franklin Quadrangle and Part of the Hamburg Quadrangle, New Jersey (USGS Professional Paper 638) (PDF). Washington D.C.: USGS. p. 30.
  4. ^ McCarthy, William; Reavy, R. John; Stevenson, Carl T.; Petronis, Michael S. (2015). "Late Caledonian transpression and the structural controls on pluton construction; new insights from the Omey Pluton, western Ireland". Earth and Environmental Science Transactions of the Royal Society of Edinburgh. 106 (1): 11–28. doi:10.1017/S1755691015000201. S2CID 132563143.
  5. ^ Dasgupta, N.; Paljoydeep, T.; Ghosh, S. (2011). "Characteristics of pegmatoidal granite exposed near Bayalan, Ajmer district, Rajasthan". Journal of Earth System Science. 120 (4): 617–626. Bibcode:2011JESS..120..617D. doi:10.1007/s12040-011-0100-7.
  6. ^ Leong, Goh Cheng (1995-10-27). Certificate Physics And Human Geography; Indian Edition. Oxford University Press. p. 21. ISBN 978-0-19-562816-6.
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