Gary Michelfelder- PhD
- Professor (Associate) at Missouri State University
Gary Michelfelder
- PhD
- Professor (Associate) at Missouri State University
About
118
Publications
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Citations
Introduction
I am an igneous petrologist/ trace element and isotope geochemist with an interest in how magma accumulates and is stored in thick continental crust particularly at continental arcs. I am currently working with M.S. students and collaborators on projects in New Mexico, USA, Brazil and the Central Andes.
Current institution
Additional affiliations
August 2009 - May 2013
August 2014 - present
August 2014 - present
Education
August 2009 - December 2014
August 2007 - August 2009
August 2003 - May 2007
Publications
Publications (118)
The four guides in this volume are associated with the GSA 2024 Joint North-Central and South-Central Section Meeting in Springfield, Missouri, USA, near the heart of the Ozarks physiographic province. They explore urbanization in a karst terrane as well as the geology and genesis of the Viburnum Trend Mississippi Valley–type ore district. One chap...
Láscar Volcano (Volcán Láscar; 5592 m; 23°22’S, 67°44’W), located in northern Chile, is considered the most active volcano in the Central Andes Volcanic Zone (CVZ). Historic activity dates to 1848 and has involved mostly dome growth and vulcanian eruptions with one large plinian eruption in April 1993. In the pursuit of assessing explosive volcanic...
Advances in knowledge about the compositional behavior of magmatic apatite make it a relevant tool for modeling volcanic plumbing systems. Provided a temporal framework, apatite records variations in budget and behavior of volatiles throughout eruptive stages and records the changes in isotopic signatures of pre-eruptive magma. We present the first...
Lascar Volcano (Volcán Láscar) (5592 m, 23°22’S, 67°44’W) is located in the Central Andes Volcanic Zone (CVZ) of northern Chile and is considered the most active volcano in the CVZ. Historic activity dates to 1848 and has involved mostly dome growth and vulcanian eruptions with one large plinian eruption in April 1993. Here, we ascertain the evolut...
Apatite crystals provide a record of the pre-eruptive characteristics in igneous systems. Their trace element signatures record processes occurring in volcanic underpinnings, and their volatile element compositions record temporal variations in the volatile budget of magma. Recent advances have enhanced our understanding of the partitioning behavio...
ELEMENTAL ANALYSIS OF THE NORTHVIEW FORMATION CONSTRAINS DEPOSITIONAL CONDITIONS
SCHUETTE, Jaren, BASSETT, Damon, ROVEY, Charles, MICHELFELDER, Gary, 901 S National Ave, Springfield, MO 65897; Department of Geography, Geology, and Planning, Missouri State University, 901 S. National Ave., Springfield, MO 65897
Paleoenvironments can be reconstruct...
The 2021 GSA Northeastern, Southeastern, joint North-Central/South-Central, and Cordilleran Section Meet-ings were held virtually in spring 2021 during continued restrictions on travel and large gatherings due to COVID-19. Eleven groups put together field guides, taking participants on treks to states from Connecticut to Nevada in the United States...
Monogenetic small-volume basaltic volcanoes are the most abundant subaerial volcanic landforms on Earth but are some of the most poorly understood systems. Their short durations, small volumes, and lack of recurrence make monitoring and hazard assessment difficult. The Zuni-Bandera volcanic field in western New Mexico contains small-volume basaltic...
The Mogollon-Datil volcanic field is a 40–24 Ma cluster of calderas that formed during ignimbrite flare-up eruptions in southern New Mexico associated with subduction, and possible delamination, of the Farallon plate beneath the North American plate. This study uses magmatic zircon sampled from four ignimbrites from a nested caldera system and an a...
This study reports oxygen isotope values determined by laser fluorination of mineral separates from basalt through rhyolite
composition volcanic rocks erupted from the Rubio Peak and Bell Top formations and the Uvas Volcanic Field. Plagioclase phenocrysts
from the Uvas Basalts are altered and have δ18O values of 12.87‰. Pyroxene phenocrysts from th...
The Argyle mine in Australia is well known for the number of pink diamonds produced, but production is expected to shut down in a few years. The authors present a review of the history of pink and red diamonds around the world and find that India and Brazil have produced more than half the pink diamonds of greater than 12 carats. Additionally, Braz...
The Central Andes is a key global location to study the enigmatic relation between volcanism and plutonism because it has been the site of large ignimbrite- forming eruptions during the past several million years and currently hosts the world's largest zone of silicic partial melt in the form of the Altiplano- Puna Magma (or Mush) Body (APMB) and t...
The Mogollon-Datil volcanic field (MDVF), located in southern New Mexico, is the remnant of extreme and punctuated volcanism over ~12 m.y. of activity. The Bursum caldera is the youngest of three nested calderas in the Mogollon Mountains in the western MDVF. Here we present data from a high-silica, large volume ignimbrite sheet associated with the...
The authors, in a paper in this journal in 2009, note a puzzle, that in spite of extensive exploration for diamonds by major producers in the Alto Paranaiba region of West Minas Gerais State, Brazil, no primary source, such as kimberlites, for the many diamonds produced since their discovery over 250 years has been found. To answer this puzzle we p...
The Bloodgood Canyon tuff is a rhyolitic ignimbrite erupted at 28 Ma in southwestern New Mexico, USA. Three samples representing the stratigraphic section were studied in an effort to better understand the pre- and syn-eruptive history of the magma storage system and place constraints on the timescales of its existence. The samples contain phenocry...
The “PLUTONS: Investigating the Relationship between Pluton Growth and Volcanism in the Central Andes” themed issue of Geosphere is dedicated to the memory of Todd Christian Feeley, our friend, colleague, and mentor. He distinguished his career with a long string of insightful papers that integrated the geology and petrology of volcanic rocks. His...
Continental arc volcanoes represent a dramatic expression of a significant and fundamental phenomena in global tectonics: the subduction of an oceanic plate beneath a more buoyant continental plate. The subduction of an oceanic plate results in recycling of crustal material into the convecting mantle, partial melting, and primary basalt production....
The central Andes is a key global location to quantify storage, transport, and volumes of magma in the Earth’s crust as it is home to the world’s largest zone of partial melt (the Altiplano-Puna Magma or Mush Body, APMB) as well as the more recently documented Southern Puna Magma Body (SPMB). We describe results from the recently completed internat...
The Mogollon-Datil volcanic field in southern New Mexico represents the last volcanism associated with continental arc magmatism in the southwest United States. In the 13 m.y. history of the volcanic field as few as 15 calderas erupted homogeneous andesite to rhyolite ignimbrites and lava flows between 38 Ma and 25 Ma. Here we present bulk-rock maj...
The origin of diamonds in the Coromandel area has been an enigma for many years, in spite of high investment in conventional and high tech prospecting methods by major mining companies for over half a century. The authors review the history, and then discuss the two principal hypotheses
to explain the source of these alluvial diamonds. After mappin...
Mineral inclusions are a key tool to understanding the complex history of geologic environments. Investigating the composition of inclusion and tying that information to growth zone compositions can provide detailed insight into changing thermal and chemical conditions in both igneous and metamorphic systems. Here we present an examination of micro...
The Mogollon-Datil volcanic eld in southern New Mexico represents the last volcanism associated with continental arc magmatism in the southwest United States. In the 13 m.y. history of the volcanic eld as few as 15 calderas erupted homogeneous andesite to rhyolite ignimbrites and lava ows between 38 Ma and
25 Ma. Here we present bulk-rock major- an...
Cerro Uturuncu, southwest Bolivia, is a high-K, calc-alkaline, composite volcano constructed upon extremely thick continental crust approximately 125 km behind the arc-front of the Andean Central Volcanic Zone (CVZ). Eruptive activity occurred between 890 - 271 ka in a single phase of volcanism lasting ~620,000 years. The edifice consists of a cent...
Continental arc volcanoes represent a dramatic surface expression of one of the most significant and fundamental phenomena in global tectonics: subduction of an oceanic plate beneath a more buoyant continental plate. The subduction of an oceanic plate results in recycling of crustal material into the convecting mantle, partial melting, and primary...
Questions
Question (1)
I have a student working on natural garnets that show a unique crystal habit and cleavage. We analyzed two of these garnets by single crystal XRD thinking that we may have a structural defect that may be affecting the cleavage planes. We selected two crystals that when imaged by BSE the garnets showed no signs of compositional zoning or twinning, but when we analyzed them by XRD the data can not be resolved without the addition of zones and twins. Is there a program or statistical method that we can use to resolve whether we have zoning or twinning in the samples? Or it there a different method that could be used to resolve this information?
