A5068293138- Geochemistry and Geologic Mapping
- Geological and Geochemical Analysis
- Paleontology and Stratigraphy of Fossils
- Radioactive element chemistry and processing
- Geochemistry and Elemental Analysis
- Astro and Planetary Science
- Isotope Analysis in Ecology
- Mineral Processing and Grinding
- Metal Extraction and Bioleaching
- Hydrocarbon exploration and reservoir analysis
- High-pressure geophysics and materials
- Research Data Management Practices
- Crystal Structures and Properties
- Census and Population Estimation
- Atmospheric and Environmental Gas Dynamics
- Theoretical and Computational Physics
- Advanced Clustering Algorithms Research
- Soil Geostatistics and Mapping
- Cultural Heritage Materials Analysis
- Mercury impact and mitigation studies
- Advanced Graph Neural Networks
- Mining and Gasification Technologies
- Mining and Resource Management
- Pleistocene-Era Hominins and Archaeology
- Silicon Effects in Agriculture
Purdue University Northwest
2016-2024
University of Arizona
2010-2015
Carnegie Institution for Science
2015
Four factors contribute to the roles played by chance and necessity in determining mineral distribution diversity at or near surfaces of terrestrial planets: (1) crystal chemical characteristics; (2) stability ranges; (3) probability occurrence for rare minerals; (4) stellar planetary stoichiometries extrasolar systems. The most abundant elements generally have largest numbers species, as modeled relationships Earth9s upper continental crust (E) Moon (M), respectively: Log ( N E ) = 0.22 C +...
Analyses of the temporal and geographic distribution earliest recorded appearances 88 IMA-approved mercury minerals plus two potentially valid species exemplify principles mineral evolution. Metacinnabar (HgS) native Hg are only reported from meteorites, specifically, primitive H3 Tieschitz chondrite with an age 4550 Ma. Since first terrestrial appearance cinnabar more than 3 billion years ago, have been present continuously at or near Earth’s surface. Mercury evolution is characterized by...
Large and growing data resources on the diversity, distribution, properties of minerals are ushering in a new era data-driven discovery mineralogy. The most comprehensive international mineral database is IMA database, which includes information more than 5400 approved species their properties, mindat.org source, contains 1 million species/locality found at 300 000 localities. Analysis visualization these with diverse techniques—including chord diagrams, cluster Klee skyline varied methods...
Analysis of manganese mineral occurrences and valence states demonstrate oxidation Earth's crust through time. Changes in crustal redox state are critical to evolution, but few methods exist for evaluating spatially averaged Manganese (Mn) is a redox-sensitive metal whose variable abundance minerals make it useful tracer oxidation. We find that the average Mn has risen last 1 billion years response atmospheric oxygenation following 66 ± million-year time lag. interpret this lag as necessary...
The current rate of discovery new boron minerals (65 species or potential described from 2008 to 2017) is higher than at any prior 10 year period, implying that rates B mineral could increase further with no obvious limit diversity in Earth's crust. In contrast, large number rare events (LNRE) models calculated the 295 discovered through 2017 give a total predicted endowment crust 459 ±65.5 and 523 species, using finite Zipf-Mandelbrot (fZM) model Sichel's generalized inverse Gauss-Poisson...
Abstract Boron minerals are among the most structurally and chemically complex naturally occurring inorganic compounds. Of 291 B recognized as valid or potentially valid, structures known for 256 species (plus three polytypes); 245 of these age earliest reported occurrence in geologic record has also been reported. The four tourmaline formed during metamorphism at 3550 Ma Isua supracrustal belt (Greenland), but many ephemeral restricted to Late Cenozoic Holocene deposits. We analyzed...
Recent studies of mineral diversity and distribution lead to the prediction >1563 species on Earth today that have yet be described-approximately one fourth 6394 estimated total mineralogical diversity. The these “missing” minerals is not uniform with respect their essential chemical elements. Of 15 geochemically diverse elements (Al, B, C, Cr, Cu, Mg, Na, Ni, P, S, Si, Ta, Te, U, V), we predict approximately 25% Al, Ta remain described-a percentage similar predicted for all minerals. Almost...
Minerals containing cobalt as an essential element display systematic trends in their diversity and distribution. We employ data for 66 approved Co mineral species (as tabulated by the official list of International Mineralogical Association, http://rruff.info/ima, 1 March 2016), representing 3554 species-locality pairs (www.mindat.org other sources, 2016). find that cobalt-containing species, which 20% are known at only one locality more than half from five or fewer localities, conform to a...
Studies in mineral ecology exploit mineralogical databases to document diversity-distribution relationships of minerals—relationships that are integral characterizing "Earth-like" planets. As carbon is the most crucial element life on Earth, as well one defining constituents a planet's near-surface mineralogy, we focus here diversity and distribution carbon-bearing minerals. We applied Large Number Rare Events (LNRE) model 403 known minerals carbon, using 82 922 species/locality data...
Large and growing data resources on the spatial temporal diversity distribution of more than 400 carbon-bearing mineral species reveal patterns evolution ecology. Recent advances in analytical visualization techniques leverage these are propelling mineralogy from a largely descriptive field into one prediction within complex, integrated, multidimensional systems. These discoveries include: (1) systematic changes character carbon minerals their networks coexisting through deep time; (2)...
The search for definitive biosignatures—unambiguous markers of past or present life—is a central goal paleobiology and astrobiology. We used pyrolysis–gas chromatography coupled to mass spectrometry analyze chemically disparate samples, including living cells, geologically processed fossil organic material, carbon-rich meteorites, laboratory-synthesized compounds mixtures. Data from each sample were employed as training test subsets machine-learning methods, which resulted in model that can...
Cluster analysis of presolar silicon carbide grains based on literature data for 12C/13C, 14N/15N, δ 30Si/28Si, and 29Si/28Si including or not inferred initial 26Al/27Al data, reveals nine clusters agreeing with previously defined grain types but also highlighting new divisions. Mainstream reside in three probably representing different parent star metallicities. One these has a compact core, narrow range composition, pointing to an enhanced production SiC asymptotic giant branch (AGB) stars...
Minerals containing chromium (Cr) as an essential element display systematic trends in their diversity and distribution. We employ data for 72 approved terrestrial Cr mineral species (http://rruff.info/ima, of 15 April 2016), representing 4089 species-locality pairs (http://mindat.org other sources, 2016). find that Cr-containing species, which 30% are known at only one locality more than half from three or fewer localities, conform to a Large Number Rare Events (LNRE) Our model predicts...
We employ large mineralogical data resources to investigate the diversity and spatial distribution of vanadium minerals. Data for 219 approved species (http://http://rruff.info/ima, as April 15, 2016), representing 5437 mineral species-locality pairs (http://http://mindat.org other sources, facilitate statistical evaluation network analysis these V minerals form a sparse, moderately centralized transitive network, they cluster into at least seven groups, each which indicates distinct...
Mineral evolution, the study of diversity and temporal distribution Earth's crystalline phases, posits that mineral species have diversified over past 4.5 billion years as a result varied physical, chemical, biological processes. The complementary field ecology is spatial on Earth other terrestrial planets. Research in evolution contributes to questions related life's origins with premise emergence life required sequence chemical reactions. Is origin deterministic or rather an improbable...
ABSTRACT We report the use of several cluster analysis techniques to evaluate classification pre-solar silicon carbide (SiC) grains. The stability clusters and confidence individual assignments grains are assessed using consensus clustering with resampling methods. Our shows that SiC can be divided into seven groups found highly stable most being assigned same for at least 90 per cent time over multiple aggregated clustering. Among groups, two dominated by AB grains, three MS one group Z X...
In this paper, we first rework B. Kaufman's 1949 paper [Phys. Rev. 76, 1232 (1949)] by using representation theory. Our approach leads to a simpler and more direct way of deriving the spectrum transfer matrix for finite periodic Ising model. We then determine formulas spin correlation functions that depend on elements induced rotation associated with operator in basis eigenvectors matrix. The is obtained considering as an intertwining map. exhibit “new”...