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! Variable || Control on ductility
! Variable || Control on ductility
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| Lithology || Grain mineralogy and cement type control ductility. Brittle seals include [[dolostone]], quartzite, anhydrite, and some shales. Ductile seals include halite, some shales, and some limestones.
| Lithology || Grain mineralogy and cement type control ductility. Brittle seals include [[dolostone]], quartzite, [[anhydrite]], and some shales. Ductile seals include halite, some shales, and some limestones.
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| Composition || Not all limestones or shales have the same ductility. Compositional variations such as total organic carbon<ref name=ch10r13>Chong, K., P., Hoyt, P., M., Smith, J., W., Paulsen, B., Y., 1980, Effects of strain rate on oil shale fracturing: International Journal of Rock Mechanics, vol. 17, no. 1, p. 35–43., 10., 1016/0148-9062(80)90004-2</ref> and clay mineralogy<ref name=ch10r14>Corbett, K., Friedman, M., Spang, J., 1987, [http://archives.datapages.com/data/bulletns/1986-87/data/pg/0071/0001/0000/0017.htm Fracture development and mechanical stratigraphy of Austin Chalk, Texas]: AAPG Bulletin, vol. 71, no. 1, p. 17–28.</ref> change ductility.
| Composition || Not all limestones or shales have the same ductility. Compositional variations such as total organic carbon<ref name=ch10r13>Chong, K., P., Hoyt, P., M., Smith, J., W., Paulsen, B., Y., 1980, Effects of strain rate on oil shale fracturing: International Journal of Rock Mechanics, vol. 17, no. 1, p. 35–43., 10., 1016/0148-9062(80)90004-2</ref> and clay mineralogy<ref name=ch10r14>Corbett, K., Friedman, M., Spang, J., 1987, [http://archives.datapages.com/data/bulletns/1986-87/data/pg/0071/0001/0000/0017.htm Fracture development and mechanical stratigraphy of Austin Chalk, Texas]: AAPG Bulletin, vol. 71, no. 1, p. 17–28.</ref> change ductility.