岩鞍

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地質剖面展示褶皺構造中的岩鞍狀火成岩（紅色）

岩鞍（英語：phacolith）是一種侵入火成岩的岩體，大致平行於層理面。 是一個透鏡狀岩體形成于背斜的頂部或向斜的槽谷[1]。 偶爾它能從背斜的頂部延伸到相鄰的向斜的槽中，因此其橫截面呈 S 形。 在褶皺的地形中，褶皺的背斜頂和向斜槽是減壓區，因此利於岩漿侵入[2].

實例[编辑]

在新澤西州蘇塞克斯縣的富蘭克林和漢堡地區[3]。

愛爾蘭的奧美冥王星[4].

印度拉賈斯坦邦阿杰梅爾區巴亞蘭附近[5].

英格蘭什羅普郡的康登山[6].

參考文獻[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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