Stock (geology) explained

In geology, a stock is an igneous intrusion that has a surface exposure of less than 100km2,^{[1] [2]} differing from batholiths only in being smaller. A stock has a discordant relationship with the rocks that it intrudes. Many stocks are cupolas of hidden batholiths.^{[3] [2]} Some circular or elliptical stocks may be volcanic plugs, which fill the vents of now extinct volcanoes.^{[4] [5]} A boss is a small stock.^[6]

Examples

• the Alta and Clayton Peak stocks (composed of granodiorite), near Park City, Utah^[7]
• the Hellroaring Creek and Salal Creek stocks (of granite-granodiorite and quartz monzonite, respectively) in British Columbia, Canada^{[8] [9]}
• the Céret stock (of gabbro and diorite) in Pyrénées-Orientales, France^[10]
• the Parashi stock (of tonalite) in La Guajira Department, Colombia^[11]
• stocks of syenite in the Caldera de Tejeda on Gran Canaria^[12]
• Ailsa Craig granitic boss, which forms a volcanic plug, in Scotland^[5]

Notes and References

1. Gabler, R.E. et al. (2009) Physical Geography (9th edition), Cengage Learning Inc., page 390.
2. Whittow, John (1984). Dictionary of Physical Geography. London: Penguin, 1984, p. 513. .
3. Book: Albert, Fay H.. A Glossary of the Mining and Mineral Industry. Government Printing Office. Washington, D.C.. 200. 1947.
4. Geological, Geochemical, and Diamond Drilling Report on the Salal 1-6 Claims, Pemberton, B.C.. Geo-Facts. Kikauka. Andris. 7. 1996. Sooke, British Columbia.
5. Book: Geology and Landscapes of Scotland (2nd edition) . Dunedin . Gillen, C. . 2003 . 978-1780460093.
6. Geology of the Mount Velma Quadrangle, Elko County, Nevada . Coash, John R. . Nevada Bureau of Mines Bulletin . 1967 . 68 . 16.
7. Contact metamorphism surrounding the Alta stock: Thermal constraints and evidence of advective heat transport from calcite + dolomite geothermometry . Cook . Stephen J. . Bowman . John R. . American Mineralogist . 1994 . 79 . 513–525.
8. Book: Compositional Features and Rare Metal Mineralization of the Hellroaring Creek Stock, Southeastern British Columbia (NTS 082F/09) – Geological Fieldwork 2011, Paper 2012-1 . British Columbia Ministry of Energy, Mines and Petroleum Resources . S.G. Soloviev . 2011 . 181–198.
9. Mustard. D. K.. Campbell. C. B.. Salal Creek Molybdenum Property. Government of British Columbia. 6, 7, 8, 9. 1971.
10. Fluid-fluxed melting and melt loss in a syntectonic contact metamorphic aureole from the Variscan eastern Pyrenees . C. . Aguilar . M. . Liesa . J. . Reche . R. . Powell . Journal of Metamorphic Geology . 2016 . 34 . 4 . 379–400 . 10.1111/jmg.12187. 2445/181649 . free .
11. Thermal modeling of pluton emplacement and associated contact metamorphism: Parashi stock emplacement in the Serranía de Jarara (Alta Guajira, Colombia) . Lina Fernanda . Martínez . Carlos A. . Zuluaga C. . Earth Sciences Research Journal . 2010 . 14 . 2.
12. Book: Pérez Torrado . F.J. . Carracedo . J.C. . Cenozoic volcanism II - the Canary Islands – Gran Canaria . Gibbons . W. . Moreno . T. . The Geology of Spain . 448 . The Geological Society . 2002 . 1-86239-110-6.