Rhiannon Mayne
Oscar and Juanita Monnig Endowed Chair of Meteoritics and Planetary Science Texas Christian University
- Fort Worth TX
Museum curator and researcher specializing in the study of meteorites and planetary science, as well as education and public outreach.
Media
Social
Biography
My research explores the processes that occurred during the early history of our Solar System, with a primary focus on understanding the formation of differentiated bodies (those with a core, mantle, crust structure). My students and I primarily study the mineralogy, geochemistry, and spectra of asteroidal meteorites to gather information about planetary formation and Solar System evolution
Areas of Expertise
Education
University of Tennessee, Knoxville
PhD
Geology
2008
Edinburgh University
BSc
Geology
2002
Languages
- English
Media Appearances
Ready to launch: Students create app to make meteorite gallery more inclusive
TCU 360 online
2022-04-29
“All of that came to a head for me about three years ago and I thought, we are not offering an accessible gallery,” said Rhiannon Mayne, the collection curator and associate professor of environmental sciences at TCU. “If you think about if you are visually impaired […] coming into a gallery that’s all text and objects to look at, what can you take away from it?”
Asteroid Named After Rhiannon Mayne, Associate Professor and Curator of The Monnig Meteorite Gallery
TCU College of Science & Engineering online
2021-07-23
Responsible for the designation of small bodies in the solar system, the International Astronomical Union (IAU) Small Body Nomenclature Working Group names minor planets and comets, dwarf planets, and satellites of minor planets. It recently released its latest bulletin of asteroid names, and Associate Professor Rhiannon Mayne, Ph.D., was notified that she made the list. Asteroid 27529 (Rhiannonmayne = 2000 HJ64) is roughly 2.8 km in diameter and is located in the main asteroid belt between Mars and Jupiter. Discovered on April 26, 2000, Rhiannonmayne was first observed from Anderson Mesa Station, one of two sites of Lowell Observatory in Arizona.
Rhiannon Mayne Collects Meteorites
TCU Magazine online
2018-12-21
The native of Northamptonshire in the United Kingdom traded childhood astronaut ambitions for a career in geology. Now TCU’s Oscar and Juanita Monnig Endowed Chair of Meteoritics and Planetary Science, the associate professor of geology is a pre-eminent expert on meteorites. Mayne specializes in researching differentiation, or looking for clues about how extraterrestrial rocks formed over time. After a postdoctoral fellowship at the Smithsonian Institution, Mayne became curator of the Oscar E. Monnig Meteorite Gallery in 2009.
2nd Largest Meteorite Belongs To TCU
CBS News online
2016-11-14
'“This is the building blocks,” Mayne said. “This is before all that happened. This is what the earth would have looked like before it melted...”'
Articles
Qarabawi’s Camel Charm: Tracing the meteoritic origins of a cultural artifact
Meteoritics & Planetary Science2020
Qarabawi’s Camel Charm was acquired from Abdullah Qarabawi of the Ababda tribe of eastern Egypt. The charm consists of a chain with four links and an ~6.5 cm diameter flattened disk with the Arabic inscription “Allahu Akbar,” which translates as “God is Greatest.” Belief in the evil eye is prevalent among the Ababda, even to the modern day, and as men identify camels and the cultural objects and activities related to them as one of their most important possessions, charms and amulets are often used to ward off its influence.
Experimental insights into Stannern‐trend eucrite petrogenesis
Meteoritics & planetary science2017
The incompatible trace element‐enriched Stannern‐trend eucrites have long been recognized as requiring a distinct petrogenesis from the Main Group‐Nuevo Laredo (MGNL) eucrites. Barrat et al. (2007) proposed that Stannern‐trend eucrites formed via assimilation of crustal partial melts by a MGNL‐trend magma. Previous experimental studies of low‐degree partial melting of eucrites did not produce sufficiently large melt pools for both major and trace element analyses. Low‐degree partial melts produced near the solidus are potentially the best analog to the assimilated crustal melts. We partially melted the unbrecciated, unequilibrated MGNL‐trend eucrite NWA 8562 in a 1 atm gas‐mixing furnace, at IW‐0.5, and at temperatures between 1050 and 1200 °C. We found that low‐degree partial melts formed at 1050 °C are incompatible trace element enriched, although the experimental melts did not reach equilibrium at all temperatures. Using our experimental melt compositions and binary mixing modeling, the FeO/MgO trend of the resultant magmas coincides with the range of known Stannern‐trend eucrites when a primary magma is contaminated by crustal partial melts. When experimental major element compositions for eucritic crustal partial melts are combined with trace element concentrations determined by previous modeling (Barrat et al. 2007), the Stannern‐trend can be replicated with respect to both major, minor, and trace element concentrations.
Hiding in the howardites: Unequilibrated eucrite clasts as a guide to the formation of Vesta's crust
Meteoritics & planetary science2016
National Meteorite Collection at the Smithsonian were examined for the presence of fine-grained eucrite clasts, with the goal of better understanding the formation of the uppermost crust of asteroid 4Vesta. Eight clasts were identified and characterized in terms of their textures and mineral chemistry, and their degree of thermal metamorphism was assessed. The paucity of fine-grained eucrites, both within the unbrecciated eucrites and as clasts within the howardites, suggests that they originate from small-scale units on the surface of Vesta, most likely derived from partial melting. Six of the eight clasts described were found to be unequilibrated, meaning that they preserve their original crystallization trends. The vast majority of eucrites are at least partially equilibrated, making these samples quite rare and important for deciphering the petrogenesis of the vestan crust. Biomodal grain populations suggest that eucrite melts often began crystallizing pyroxene and plagioclase during their ascent to the surface, where they were subject to more rapid cooling, crystallization, and later metasomatism. Pyroxene compositions from this study and prior work indicate that the products of both primitive and evolved melts were present at the vestan surface after its formation. Two howardite thin sections contained multiple eucrite composition clasts with different crystallization and thermal histories; this mm-scale diversity reflects the complexity of the current day vestan surface that has been observed by Dawn.
The origin of Vesta’s crust: Insights from spectroscopy of the Vestoids
Icarus2011
High quality VNIR spectra of 15 Vestoids, small asteroids that are believed to originate from Vesta, were collected and compared to laboratory spectra and compositional data for selected HED meteorites. A combination of spectral parameters such as band centers, and factors derived from Modified Gaussian Model fits (band centers, band strengths, calculation of the low to high-Ca pyroxene ratio) were used to establish if each Vestoid appeared most like eucrite or diogenite material, or a mixture of the two (howardite). This resulted in the identification of the first asteroid with a ferroan diogenite composition, 2511 Patterson. This asteroid can be used to constrain the size of diogenite magma chambers within the crust of Vesta. The Vestoids indicate that both large-scale homogeneous units (>5km) and smaller-scale heterogeneity.
Petrologic insights from the spectra of the unbrecciated eucrites: Implications for Vesta and basaltic asteroids
Meteoritics & Planetary Science2010
We investigate the relationship between the petrology and visible–near infrared spectra of the unbrecciated eucrites and synthetic pyroxene–plagioclase mixtures to determine how spectra obtained by the Dawn mission could distinguish between several models that have been suggested for the petrogenesis of Vesta’s crust (e.g., partial melting and magma ocean). Here, we study the spectra of petrologically characterized unbrecciated eucrites to establish spectral observables, which can be used to yield mineral abundances and compositions consistent with petrologic observations. No information about plagioclase could be extracted from the eucrite spectra. In contrast, pyroxene dominates the spectra of the eucrites and absorption band modeling provides a good estimate of the relative proportions of low- and high-Ca pyroxene present. Cr is a compatible element in eucrite pyroxene and is enriched in samples from primitive melts. An absorption at 0.6 μm resulting from Cr3+ in the pyroxene structure can be used to distinguish these primitive eucrites. The spectral differences present among the eucrites may allow Dawn to distinguish between the two main competing models proposed for the petrogenesis of Vesta (magma ocean and partial melting). These models predict different crustal structures and scales of heterogeneity, which can be observed spectrally. The formation of eucrite Allan Hills (ALH) A81001, which is primitive (Cr-rich) and relatively unmetamorphosed, is hard to explain in the magma ocean model. It could only have been formed as a quench crust. If the magma ocean model is correct, then ALHA81001-like material should be abundant on the surface of Vesta and the Vestoids.
