|Stable isotope geochemistry, metamorphism and volatile transport in subduction zones, fluid-rock interaction and metasomatism, geochemical cycling, stable chlorine isotopes|
|Volcanology, volcanic eruption processes, magmatic processes, experimental petrology, volatiles in magmas, degassing of volatiles from magmas, control of degassing behavior on volcanic eruptions and formation of ore bodies|
|– Marine and planetary geophysical imaging at nested resolutions and ground truth through drilling, coring, logging, and sampling.|
– Tectonic processes, tectonic-climate interactions, and geohazards of convergent margins and transitional tectonic environments.
– Role of catastrophism in the geologic record including impact cratering, hurricanes, and tectonic events.
– Planetary habitability, impact ...
|Dr. Helper is a field geologist, a generalist whose interests span igneous and metamorphic petrology, structural geology, tectonics, mineralogy and planetary field geology. His current research explores geochemical and isotopic similarities of Proterozoic and Archean crust in East Antarctica and the southwestern U.S., the Precambrian geology of Texas, and ...|
|Multiphase flow in porous media, geomechanics, numerical simulation, mathematical, modeling, reactive transport, magma dynamics.|
|Earth's origin and evolution, isotope and trace element geochemistry, the role of crust and lithospheric mantle recycling in the generation of mantle chemical heterogeneity, the origin and distribution of water and other volatile elements in the Earth's interior, and the thermal and chemical evolution of the Earth's core and core/...|
|Mineral physics, physics and chemistry of planetary materials, solid-Earth geophysics and geochemistry, high-pressure diamond anvil cell, X-ray and laser spectroscopy|
|Deep volatile cycling; magmatic and metamorphic processes; planetary differentiation and habitability|