Reader in Petrology & Geochemistry
Department of Earth Sciences
Linking Deep Earth and Surface Processes
* Mantle Petrology & Geochemistry
To view my publications see below
ORCID (Open Researcher and Contributor ID)
*Note that in Summer 2016 we installed a new 193 ESI laser coupled to a Perkin Elmer Nexion ICP-MS*
To download my CV click here.
Upcoming invited talks
- 25th November 2016. Nebrija University, Madrid. 'Galapagos volcanoes: Linking Earth's deep interior with its surface evolution'
- 20th March 2017. Harold Wilson Memorial Lecture, Belfast. 'Flood Basalts'.
- 13th-26th March 2017. Science Festival, University of Cambridge. Darwin the Geologist
- May 2017. Dept of Earth Sciences Alumni event, University of Cambridge
Current Additional Posts Held
2001 – : ICP-MS Lab Manager, Department of Earth Sciences, University of Cambridge
2009 – : Trustee Cambridge Arctic Shelf Project (CASP)
2010 – 2013: Member of Council, Geological Society of London
2010 – : Honorary Curator in Petrology, Sedgwick Museum, University of Cambridge
2011 – : Teaching Accreditation Panel for UK Earth Sciences, Geological Society of London
2013 – 2015: Science & External Relations Committee, Geological Society of London
2013 – : Geoconservation Committee, Geological Society of London
Membership of Professional Organisations
American Geophysical Union (since 1991)
Geological Society of London (since 1985)
Mineralogical Society of Great Britain & Ireland (since 1998)
My research group is focused on both field and laboratory (petrological, experimental, geochemical and geophysical) investigations in order to understand melt generation in the Earth’s crust and mantle and how this relates to surface processes. Key questions that our current research seeks to address fall into 4 major fields:
1. Ocean Islands: How do they form and what controls volcanism?
Ocean islands are sites of some of the world’s most active volcanism.
- Research on basaltic lavas from the islands of Tristan da Cuhna and Trindade in the South Atlantic has provided constraints on the role of recycled delaminated subcontinental lithosphere in the genesis of ocean-island basalts.
- Mid ocean ridges are anchored to mantle plumes by deep seated melt channels. Galapagos is an archetypal example of this type of interaction: our findings suggest that twGibson et al., 2015). o-phase rather than solid-state flow is important (
- A recent detailed investigation of alkaline and tholeiitic lavas from Santiago in the Galápagos has revealed that their compositions are as diverse as for any other island in the archipelago or indeed any other ocean island.
- By combining new geochemical data with published geophysical data our research has led to an understanding of the causes of widespread active volcanism throughout Galápagos: significant lithospheric thinning in the NE of the archipelago explains the generation of volcanism away from the main axis of the Galápagos plume (Gibson & Geist, 2010)
Research in Galápagos was initiated in 2007 in collaboration with D. Geist, G. Estes, T. Grant, D. Norman and S. Herbert. The main focus of this research was to establish Darwin’s route on Santiago -- formerly known as James Island -- in 1835 (Herbert et al., 2008). This is the island where Darwin made some of his most significant observations on volcanic rocks and led to his theory of gravitational settling as a cause of magmatic diversity (Gibson, 2009).
These represent the most voluminous emplacements and outpourings of magma that have occurred on Earth’s during its 4.5 billion year evolution. They frequently coincide with the break-up of supercontinents (e.g. the Paraná-Etendeka and Deccan flood-basalt provinces) and are formed by the arrival of a large, up to 2000 km in diameter, thermal anomaly on the base of Earth’s lithosphere. These so-called mantle plumes are thought to be derived from thermal boundary layers deep within the Earth, such as the 2700 km core-mantle boundary.
- Our detailed and systematic geochemical studies, together with high pressure and temperature experiments, on high Fe-picrites (undertaken in collaboration with E. Takahashi, Tokyo; J. Tuff, Oxford) have shown that garnet pyroxenite, probably derived from subducted lithospheric mantle, is present within upwelling mantle plumes.
- Our research has also documented the longevity of volcanism associated with the initial impact of the Tristan mantle plume and it’s role in the opening of the South Atlantic.
- Studies of olivine-hosted melt inclusions reveal that primitive melts in flood basalt provinces are homogenised prior to cooling and crystallisation in deep-seated magma chambers in the Earth's crust (Jennings et al., in press).
3. How did Earth's sub-continental lithospheric mantle form and how has it evolved? How does this long-lived, rigid shell modulate the release of volatiles from our planet's deep interior ?
On-going studies of mantle xenoliths are providing important insights into the formation of the Earth’s lithosphere. In particular, we have used laser ablation (LA-ICP-MS) techniques to determine concentrations of low-abundance trace-elements in mantle phases (e.g. garnet and clinopyroxene). These small-scale determinations (< 100 microns) of mineral chemistry provide important clues of the large-scale geodynamic processes that have been involved in the creation and evolution of the Earth’s lithosphere.
4. Remote sensing of rare-earth element deposits
Past & Current PhD Students
• J.A. Brod (University of Durham): Petrogenesis of the Tapira and Salitre carbonatite complexes, SE Brazil. 1994 –1998
• N.V.C. Rao: Petrogenesis of the Proterozoic kimberlites and lamproites from the Cuddapah Basin and Dhawar Craton, South India. 1995 –1997
• M. Anand: Tectonomagmatic evolution of the Cuddapah Basin, India. 1997 –2001
• P. Smith: Magmatic insights into lithospheric behaviour during varying styles of continental extension. 1997 –2001
• J.C. Greenwood: Geochemical evolution of the Trindade mantle plume. 1996 –2001
• M. Roberts: Quaternary volcanism in the East African Rift. 1998 – 2002
• J. Garner: Mantle melting and lithospheric extension beneath the Baikal Rift, Siberia. 1999 –2002
• J. Tuff: Compositional heterogeneity of the Earth's mantle. 2002- 2005
• L. Gibson: Composition and evolution of the Antarctic mantle. 2008 – 2012
• E. Jennings: Compositional heterogeneity of the Earth's mantle: constraints from olivine-hosted melt inclusions. 2011 - 2015
• E. Rooks: Subcontinental lithospheric mantle evolution of the Gondwana margin. 2012 – 2016
• C. Jackson: Halogens in the Earth's lithospheric mantle. 2016 -
• M. Gleeson: Spatial Variations in magmatic plumbing systems and the controls on magmatic volatile contents across the Galapagos archipelago. 2016 -
Past MPhil Students
- T. Brod (University of Durham) - Petrogenesis of plume-related potassic mafic magmas in central Brazil. 1996 –1999.
Petrology ; Geochemistry
*Manuscripts accepted for publication (in press) April 2017*
- Gibson, S.A. (in press). On the nature and origin of garnet in highly-refractory Archean lithospheric mantle: constraints from garnet exsolved in Kaapvaal craton orthopyroxenes. 45th Halimond Lecture. Mineralogical Magazine
*Recently published manuscripts*
- Weit, A., Trumbull, R.B., Keiding, J.K., X Geissler, W.H., Gibson, S.A., Veksler, I.V., (2017). The magmatic system beneath the Tristan da Cunha hotspot: insights from thermobarometry, melting models and geophysics. Tectonophysics
- Jennings, E., Gibson, S.A., Maclennan, J. & Heinnonen, J. (2017). Deep mixing of mantle melts beneath continental flood basalt provinces: Constraints from olivine-hosted melt inclusions in primitive magmas. Geochim Cosmochim Acta
- Jennings, E., Shortlle. O., Holland, T.J.B.H., Maclennan, J. & Gibson, S.A., (2016). The composition of melts from a heterogeneous mantle and the origin of ferropicrite: Application of a thermodynamic model. J. Petrology
Triggering of the largest Deccan eruptions by the Chicxulub impact: Reply. GSA Bulletin, 128, 11-12.
- Gibson, S.A., Thompson, R.N., Day, J., Humphris, S.E., Dickin, A.P. 2005. Melt generation processes associated with the Tristan mantle plume: constraints on the origin of EM-1.Earth and Planetary Science Letters 237, 744-767
- Tuff, J., Takahashi, E. & Gibson, S.A., 2005. Experimental Constraints on the Role of garnet pyroxenite in the genesis of high-Fe mantle plume derived melts. Journal of Petrology 46, 2023-2058
- Thompson, R.N., Ottley, C.J., Smith, P.M., Pearson, D.J., Morrison, M.A., Leat, P.T. & Gibson, S.A., 2005. The puzzle of OIB-like continental alkalic magmatism: Quaternary alkalic basalts, picrites and basanites of the Potrillo Volcanic Field, New Mexico, USA. Journal of Petrology 46, 1603-1643.
- Johnson, J., Gibson, S.A., Thompson, R.N. & Nowell, G.M., 2005.Volcanism in the Vitim Field, Siberia: geochemical evidence for a mantle plume beneath the Baikal Rift Zone. Journal of Petrology 46, 1309-1344
- Chalpathi Rao, N. V., Gibson, S. A., Pyle, D. M., Dickin, A. P., 2004. Petrogenesis of Proterozoic lamproites and kimberlites from the Cuddapah Basin and Dharwar Craton, Southern India. Journal of Petrology 45, 907-948
- Anand, M. , Gibson, S. A., Subbarao, K. V., Kelley, S. P., Dickin, A. P. 2003. Early Proterozoic melt generation processes beneath the intra-cratonic Cuddapah Basin, Southern India. Journal of Petrology, 44, 2139-2171
- Thompson, R. N., Smith, P. M., Gibson, S. A., Mattey, D. P., Dickin, A. P., 2002. Ankerite carbonatite from Swartbooisdrif, Namibia: the first evidence for magmatic ferrocarbonatite. Contributions to Mineralogy and Petrology 143, 377-395
- Gibson, S.A., Major element heterogeneity in Archean to recent mantle plume starting-heads. Earth and Planetary Science Letters 195, 59-74.
- Thompson, R.N., Gibson, S.A., Dickin, A.P. & Smith, P., 2001. Early Cretaceous basalt and picrite dykes of the Southern Etendeka region, NW Namibia: windows into the role of the Tristan mantle plume in Paraná-Etendeka magmatism. Journal of Petrology 42, 2049-2081.
- Thompson, R.N. & Gibson, S.A., 2000. Transient high temperatures in mantle plume heads inferred from magnesian olivines in Phanerozoic picrites. Nature 407, 502-505.
- Mahotkin, I. L. Gibson, S.A., Thompson, R. N, Zhuravlev, D. Z. & P. U.Zherdev, 2000. Late Devonian Diamondiferous Kimberlite and Alkaline Picrite (Proto-kimberlite?) Magmatism in the Arkhangelsk Region, NW Russia. Journal of Petrology 41, 201-227.
- Gibson, S.A., Thompson, R.N. & Dickin, A.P., 2000. Ferropicrites: geochemical evidence for Fe-rich streaks in upwelling mantle plumes. Earth and Planetary Science Letters 174, 355-374.
- Rao, J. V. C., Miller, J. A., Gibson, S. A., Pyle, D. M., Madhavan, V., 1999. Precise 40Ar/39Ar age determination of the Kotakonda kimberlite and Chelima lamproite, India: implication to the timing of mafic dyke swarm emplacement in the Eastern Dharwar craton. Reply. J. Geological Society of India, 54, 205-209
- Rao, N.V.C., Miller, J.A., Gibson, S.A., Pyle, D.M. & Madhavan, 1999. Precise 40Ar/39Ar age determinations of kimberlites and lamproites from southern India. J. Geological Society of India, 53, 25-432
- Greenwood, J. C., Gibson, S. A., Thompson, R. N., Weska, R. K., Dickin, A. P., 1999. Cretaceous kimberlites from the Paranatinga-Batovi region, Central Brazil: Geochemical evidence for subcratonic lithosphere mantle heterogeneity. Proceedings of the Seventh International Kimberlite Conference 1, 291-298
- Gibson, S.A., Thompson, R.N., Leonardos, O.H., Dickin, A.P. & Mitchell, J.G. 1999. Localised plume-lithosphere interactions during CFB genesis: geochemical evidence from Cretaceous magmatism in southern Brazil. Contrib. Mineral. Petrol. 137, 147-169.
- Rao, N. V. C., Gibson, S. A., Pyle, D. M., Dickin, A. P., 1998. Contrasting isotopic mantle sources for Proterozoic lamproites and kimberlites from the Cuddapah Basin and Eastern Dharwar craton:implication for Proterozoic mantle heterogeneity beneath Southern India. J. Geological Society of India 52, 683-694.
- Thompson, R.N., Gibson, S.A., Mitchell, J.G., Dickin, A.P., Leonardos, O.H., Brod, J.A. & Greenwood, J.C., 1998. Migrating Cretaceous-Eocene magmatism in the Serra do Mar alkaline province, SE Brazil: melts from the deflected Trindade mantle plume? Journal of Petrology 39, 1493-1526.
- Thompson, R.N., Velde, D., Leat, P.T., Morrison, M.A., Mitchell, J.G., Dickin, A.P. & Gibson, S.A., 1997. Oligocene lamproite containing an Al-poor Ti-rich biotite, Middle Park, north west Colorado, USA. Min. Mag. 61, 557-572.
- Gibson, S.A., Thompson, R.N., Weska, R., Dickin, A.P., Leonardos, O.H. 1997. Late Cretaceous rift-related upwelling and melting of the Trindade starting mantle plume head beneath western Brazil. Contrib. Mineral. Petrol. 126, 303-314.
- Leonardos, O.H., Fleischer, R., Thompson, R.N., Gibson, S.A., Svisero, D.P. & Weska, R.K., 1996. Comments on the paper of G.M. Gonzaga et al.,’The origin of diamonds in western Minas Gerais, Brazil’ Mineral Deposita 31, 343-344
- Gibson, S.A., Thompson, R.N., Leonardos, O.H. & Dickin, A.P. 1995. High-Ti and Low-Ti mafic potassic magmas: Key to plume-lithosphere interactions and continental flood-basalt genesis. Earth Planet. Sci. Letts. 136, 149-165.
- Gibson, S.A., Thompson, R.N., Leonardos, O.H., Dickin, A.P. & Mitchell, J.G., 1995. The Late Cretaceous impact of the Trindade mantle plume: evidence from large-volume, mafic, potassic magmatism in SE Brazil. Journal of Petrology, 36, 189-229.
- Leonardos, O.H., Gibson, S.A., Thompson, R.N., 1997. First evidence of thick sub-cratonic lithospheric mantle forming a Cretaceous diamond source beneath SE Brazil. In ‘The Dynamic Geosphere, ed. A.K. Gupta & R. Kerrich. Proc. Acad. Sci. India (volume in honour of W.S. Fyfe), 56-67.
- Thompson, R.N. & Gibson, S.A., 1994. Magmatic expression of lithospheric thinning across continental rifts. Tectonophys., 233, 41-68.
- Gibson, S.A., Thompson, R.N., Leonardos, O.H., Turner, S., Mitchell, J.G. & Dickin, A.P., 1994. The Serra do Bueno potassic diatreme: a possible hypabyssal equivalent of the ultramafic potassic volcanics in the Late Cretaceous Alto Paranaíba Igneous Province, SE Brazil. Mineral. Mag. 58, 357-372.
- Gibson, S.A., 1994. Review of 'Magmatism in Extensional Structural Settings' by A.B. Kampunzu & R.T. Lubala (eds). J. Petrology, 35, 289.
- Thompson, R.N., Gibson, S.A., Leat, P.T., Morrison, M.A., Hendry, G.L, Dickin, A.P. & Mitchell, J.G., 1993. Early-Miocene continental extension-related mafic magmatism at Walton Peak, Northwest Colorado: further evidence on continental basalts genesis. J. Geol. Soc. Lond.150, 277-292.
- Gibson, S.A., Thompson, R.N., Leat, P.T., Morrison, M.A., Hendry, G.L., Dickin, A.P. & Mitchell, J.G., 1993. Ultrapotassic magmas along the flanks of the Oligo-Miocene Rio Grande rift, USA: monitors of the zone of lithospheric extension and thinning beneath a continental rift. J. Petrology 34, 187-228.
- Gibson, S.A., Thompson, R.N., Leat, P.T., Dickin, A.P., Morrison, M.A., Hendry, G.L. & Mitchell, J.G., 1992. Asthenosphere-derived magmatism in the Rio Grande rift, western USA: implications for continental break-up. In Storey, B.C., Alabaster, T. & Pankhurst, R.J. (eds.) Magmatism and the Causes of Continental Breakup. Geol. Soc. Lond. Spec. Publ. 68, 61-89.
- Thompson, R.N. & Gibson, S.A., 1991. Subcontinental mantle plumes, hot spots and pre-existing thinspots. J. Geol. Soc. Lond. 148, 973-977.
- Gibson, S.A., Thompson, R.N., Leat, P.T., Morrison, M.A., Hendry, G.L. & Dickin, A.P., 1991. The Flat Tops volcanic field NW Colorado 1: Lower Miocene open-system multi-source magmatism at Flander, Trappers Lake. J. Geophys. Res. 96, 13609-13627.
- Gibson, S.A. & Jones, A.P., 1991. Igneous stratigraphy and internal structure of the Little Minch Sill Complex on the Trotternish Peninsula, N. Skye, Scotland. Geol. Mag. 128, 51-66.
- Thompson, R.N., Leat, P.T., Morrison, M.A., Hendry, G.L. & Gibson, S.A., 1990. Strongly potassic mafic magmas from lithospheric mantle sources during continental extension and heating: evidence from Miocene minettes of northwest Colorado, U.S.A. Earth Planet. Sci. Lett. 98, 139-53.
- Gibson, S.A., 1990. The geochemistry of the Trotternish Sills, Isle of Skye: crustal contamination in the British Tertiary Volcanic Province. J. Geol. Soc. Lond. 147, 1071-1081.
- Gibb, F.G.F. & Gibson, S.A., 1989. The Little Minch Sill Complex. Scott. J. Geol. 25, 367-370.