Stable isotope geochemistry and biogeochemistry, interactions among the different spheres of the earth system, and relationships among tectonic, topographic, and climatic processes and conditions. Source and transport of fluids in active orogens and volcanic centers. Geochemical and biogeochemical proxies for climate change in the southern hemisphere on a variety of spatial and temporal scales. Geochemical tracing and quality assessment of water resources. Biogeochemical evaluation of foodweb structure including nutrient and trace element transport paths in exotic ecosystems. Paleotopographic investigation of mountain belts and plateaus.
- Appleby JR., Brook MS., Horton TW., Fuller IC., Holt KA. and Quincey DJ. (2017) Stable isotope (δD–δ18O) relationships of ice facies and glaciological structures within the mid-latitude maritime Fox Glacier, New Zealand. Annals of Glaciology : 1-11. http://dx.doi.org/10.1017/aog.2017.11.
- Cox TL., Oze C. and Horton TW. (2017) Iron concretions within a highly altered unit of the Berlins Porphyry, New Zealand: an abiotic or biotic story? Mineralogy and Petrology 111(2): 173-181. http://dx.doi.org/10.1007/s00710-016-0469-8.
- Hawke DJ., Cranney OR., Horton TW., Bury SJ., Brown JCS. and Holdaway RN. (2017) Foliar and soil N and δ15N as restoration metrics at Pūtaringamotu Riccarton Bush, Christchurch city. Journal of the Royal Society of New Zealand : 1-17. http://dx.doi.org/10.1080/03036758.2017.1281319.
- Andrews MG., Jacobson AD., Lehn GO., Horton TW. and Craw D. (2016) Radiogenic and stable Sr isotope ratios (87Sr/86Sr, δ88/86Sr) as tracers of riverine cation sources and biogeochemical cycling in the Milford Sound region of Fiordland, New Zealand. Geochimica et Cosmochimica Acta 173: 284-303. http://dx.doi.org/10.1016/j.gca.2015.10.005.
- Horton TW., Defliese WF., Tripati AK. and Oze C. (2016) Evaporation induced 18O and 13C enrichment in lake systems: A global perspective on hydrologic balance effects. Quaternary Science Reviews 131: 365-379. http://dx.doi.org/10.1016/j.quascirev.2015.06.030.