David Peate

David Peate
University of Iowa | UI

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146
Publications
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Publications

Publications (146)
Preprint
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This study provides evidence of the value of using isotopic data from faunal remains to understand human diet and mobility patterns when human remains are not available for examination. In this research, bone apatite, bone collagen, and enamel apatite from fauna recovered from recent excavations of the Dixon site (13WD8), an Oneota complex site (AD...
Article
The Snæfellsnes Peninsula of western Iceland is a region of transitional to alkaline Quaternary (<1.5 Ma) intraplate magmatism. Vatnafell, a sub-glacial tuya (~410 ka), is centrally located within the peninsula, between the Helgrindur/Lýsuskarð and Ljósufjöll volcanic systems, ~120 km from the divergent Western Volcanic Zone plate boundary. The Vat...
Article
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The 2014–2015 Holuhraun fissure eruption provided a rare opportunity to study in detail the magmatic processes and magma plumbing system dynamics during a 6-month-long, moderate- to large-volume basaltic fissure eruption. In this contribution, we present a comprehensive dataset, including major and trace elements of whole-rock and glassy tephra sam...
Article
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This study examines strontium, oxygen, and carbon isotope ratios (⁸⁷Sr/⁸⁶Sr, δ¹⁸O, δ¹³C) in dental enamel and bone apatite from 82 individuals interred at Late Neolithic, Chalcolithic, and Bronze Age burial sites near Madrid, Spain, to discern variations in dietary patterns and identify possible migrants. Questions about mobility patterns and subsi...
Article
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El Rebollosillo es una pequeña cueva kárstica situada en el centro de la Península Ibérica utilizada para la disposición de enterramientos secundarios en la mitad del III milenio AC. Presentamos resultados bioantropológicos, isotópicos (87Sr/86Sr, δ13C y δ18O) y 16 dataciones radiocarbónicas de los restos humanos, una descripción cuantificada de lo...
Article
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We present new 238U-230Th-226Ra-210Pb and supporting data for young lavas from southwest Pacific island arcs, Eyjafjallajökull, Iceland, and Terceira, Azores. The arc lavas have significant 238U and 226Ra excesses, whereas those from the ocean islands have moderate 230Th and 226Ra excesses, reflecting mantle melting in the presence of a water-rich...
Article
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We have identified a new crustally derived granite pluton that is related to the Emeishan Large Igneous Province (ELIP). This pluton (the Wase pluton, near Dali) shows two distinct SHRIMP zircon U–Pb age groups (~768 and ~253 Ma). As it has an intrusive relationship with Devonian limestone, the younger age is interpreted as its formation, which is...
Article
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Deep confined water from the Cambrian–Ordovician (C–O) aquifer is being increasingly used for ethanol production in Iowa. In this study, we used isotopic age dating to estimate the age of groundwater in the aquifer and assess how groundwater use for all purposes, including ethanol production, may be affecting the long-term sustainability of the aqu...
Article
According to the national survey of science education, science educators in the USA currently face many challenges such as lack of qualified secondary Earth and Space Science (ESS) teachers. Less qualified teachers may have difficulty teaching ESS because of a lack of conceptual understanding, which leads to diminished confidence in content knowled...
Article
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The Kangerlussuaq Intrusion in East Greenland is concentrically zoned from quartz nordmarkite (quartz syenite) at the margin, through pulaskite, to foyaite (nepheline syenite) in the centre, with no apparent intrusive contacts. The δ18O values of coexisting minerals are consistent with oxygen isotope equilibrium at magmatic temperatures. Most of th...
Article
The City of Manson, Iowa (USA), lies near the center of the Manson Impact Structure (MIS), a 37-km diameter impact crater that formed about 74 million years ago. The MIS is present at the bedrock surface, but it is completely buried by 20-90 m (70-300 ft) of glacial till and displays no surface expression. Groundwater samples were collected from Ma...
Article
Poplar plants (Populus deltoides × nigra, DN-34) were used as a model to explore vegetative uptake of commercially available gold nanoparticles (AuNPs) and their subsequent translocation and transport into plant cells. AuNPs were directly taken up and translocated from hydroponic solution to poplar roots, stems, and leaves. Total gold concentration...
Article
The Mariana fore-arc southeast of Guam consists of ophiolitic lithologies related to subduction initiation and early-arc development. Ages of zircons extracted from gabbroic rocks within this sequence are 51.5±0.7 Ma, synchronous with similar rocks from the Bonin fore-arc 1700 km to the north. Basalts collected from the Izu fore-arc are similar to...
Article
Only Ulleung and Baegdusan volcanoes have produced alkaline tephras in the japan Sea/East Sea during the Quaternary. Little is known about their detailed tephrostratigraphy, except for the U-Old and B-Tm tephras. Trace element analysis of bulk sediments can be used to identify alkaline cryptotephra because of the large compositional contrast Five s...
Article
New compositional data are presented for a suite of basaltic andesite to rhyolite flows from the flanks of the Pliocene–Quaternary Mt. Erciyes stratovolcano in Central Anatolia, Turkey. The samples are all part of the most recent (< 0.9 Ma) New Erciyes eruptive phase. Temperatures estimated from FeTi-oxides vary from ~ 1000 °C in the andesites to ~...
Article
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Background: On 20 March 2010, the Icelandic volcano Eyjafjallajökull erupted for the first time in 190 years. Despite many epidemiological reports showing effects of volcanic ash on the respiratory system, there are limited data evaluating cellular mechanisms involved in the response to ash. Epidemiological studies have observed an increase in resp...
Article
Vanadium exists in multiple valence states under terrestrial conditions (2 þ , 3 þ , 4 þ , 5 þ) and its isotopic composition in magmas potentially reflects the oxidation state of their mantle source. We present the first stable vanadium isotope measurements of 64 samples of well-characterized mantle-derived mafic and ultramafic rocks from diverse l...
Article
We present new compositional data on samples of the high-Ti/Y Paranapanema and Pitanga basaltic magma types from the northern and western parts of the Early Cretaceous Paraná flood basalt province in South America. A comparison of whole rock compositions with ol-plag-cpx cotectics allows crystallization pressures to be estimated for both magma type...
Article
We present new compositional data on a suite of dacite units that form the summit area of the Pliocene-Quaternary Mt. Erciyes stratovolcano in Central Anatolia, Turkey. Whole rock major and trace element analyses demonstrate the remarkable compositional homogeneity of these dacites (67.3±0.3wt.% SiO2), with only a few elements (Mg, Fe, Ca, Ni, Cu,...
Article
Paricutin volcano, located within the Michoacan-Guanajuato volcanic field (MGVF), Mexico, erupted over a 9 year period (1943-1952). Often cited as the classic example of assimilation-fractional crystallization (AFC) processes, bulk compositions of the erupted lavas at Paricutin range from basaltic andesite to andesite and previous studies have corr...
Article
Climate change is increasing the thermal stress on modern coral reefs, and has heightened interest in obtaining high-resolution temperature records associated with past reef building episodes to investigate the ability of corals to adapt to changing temperature regimes. Laser ablation ICPMS allows multi-element sampling across coral skeletons, and...
Article
The temporal evolution of erupted magma compositions at Paricutin Volcano (Mexico) is often cited as a classic example of assimilation-fractional crystallization processes with significant progressive changes in major element, trace element, and isotopic compositions occurring over the relatively short 9 year lifespan of the volcano. In this study,...
Article
New compositional data were obtained from glass shards from cryptotephra layers in five marine sediment cores from the Ulleung Basin in the East (Japan) Sea. The shards were extracted from cryptotephra layers that were distinguished in a previous study by INAA core scanning, and analysed by EDS-SEM for major elements and INAA for trace elements. Mo...
Article
Olivine-hosted melt inclusions have been analyzed from the young (4,150±300ybp) Dotsero basaltic (48.2wt% SiO2) lava flow in Northwest Colorado, USA. Silicate melt-inclusion compositions have a bimodal distribution (41–46wt% SiO2 and 47–50wt% SiO2). Low-Si melt inclusions record high pre-eruptive sulfur concentrations (>1,000ppm S) and variations i...
Article
Quaternary volcanism in Central America is concentrated in a well-defined volcanic front (VF). There are also scattered areas of Quaternary volcanism behind the volcanic front (BVF), the largest of which occurs in southeastern Guatemala. Hafnium isotopic compositions of mafic lavas systematically vary along the volcanic front, being highest in Nica...
Article
Whole rock data on the Mull Plateau Group lavas (Scotland) show that the most primitive lavas (MgO >8 wt%) are the most crustally contaminated. One model is that hot, high-MgO magmas flow turbulently during ascent allowing more assimilation to occur than in the laminar flow regime expected for cooler, more viscous, lower-MgO magmas. We present data...
Article
Large igneous provinces (LIPs) are sites of the most frequently recurring, largest volume basaltic and silicic eruptions in Earth history. These large-volume (> 1000 km3 dense rock equivalent) and large-magnitude (> M8) eruptions produce areally extensive (104–105 km2) basaltic lava flow fields and silicic ignimbrites that are the main building blo...
Article
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We present compositional data on a suite of 18 primitive neovolcanic alkali basalts from three flank-zone regions in Iceland (Vestmannaeyjar in the south, Snæfell in the east, and Snæfellsnes in the west) that are peripheral to the main rift zones that are dominated by tholeiitic basalts. This study integrates He isotope data with radiogenic isotop...
Article
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Global sea level and Earth's climate are closely linked. Using speleothem encrustations from coastal caves on the island of Mallorca, we determined that western Mediterranean relative sea level was approximately 1 meter above modern sea level approximately 81,000 years ago during marine isotope stage (MIS) 5a. Although our findings seemingly confli...
Conference Paper
Monturaqui (Chile) is a small young impact with five melt rock compositions: (1) bulk melt of plag. + quartz, (2) bulk melt of ignimbrite target rock, and (3) multi-component melts with iron-rich impactor, non-modal biotite melt, and target rock.
Article
Volcanism from large igneous provinces is often inferred to have had a significant global environmental impact, but demonstrating synchronicity between the volcanism and sedimentary records of environmental change is not straightforward. Several studies use sediment Pb isotopes to fingerprint the timing of input of volcanic Pb from a particular lar...
Article
The Central American volcanic front is noted for its systematic along-arc geochemical variations. New data show that the hafnium isotopic compositions of mafic lavas also vary regularly along the front. In detail, 176Hf/177Hf ratios are generally highest in Nicaragua and fall off toward Costa Rica and Guatemala, displaying the same along-arc chevro...
Article
High-precision Pb isotope data and Sr–Nd–Hf isotope data are presented together with major and trace element data for samples spanning the 4.6Ma history of volcanism at Santiago, in the southern Cape Verde islands. Pb isotope data confirm the positive Δ8/4 signature of the southern islands indicating that the north–south compositional heterogeneity...
Article
The Oligocene (˜26-30 Ma) Afro-Arabian Flood Volcanic Province in Yemen and Ethiopia contains significant silicic material primarily deposited as large volume (>1,000 km 3 ) ignimbrites. These deposits have been correlated to tephra layers in ODP cores ˜2700 km SE of Yemen in the Indian Ocean. We are using melt inclusions (MI) in 4 ignimbrite units...
Article
Fe–Mn crusts were recovered from the western escarpment of the Bonin Ridge in the Izu–Bonin fore-arc region (dive site #824: 28.612°N, 141.803°E) at water depths of c. 2900 m using the Shinkai 6500 submersible during cruise YK 04–05. Major and trace element data and XRD mineralogy indicate that the crusts are hydrogenetic in origin. We present prof...
Article
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New high-precision Pb-Sr-Nd isotope, major and trace element and mineral chemistry data are presented for the submarine stage of ocean island volcanism on Santiago, one of the southern islands of the Cape Verde archipelago. Pillow basalts and hyaloclastites in the Flamengos Valley are divided into three petrographic and compositional groups; the Fl...
Article
This study aims to better understand crustal assimilation processes by focusing on relatively simple monogenetic flows and by looking at trace element variations in whole rock and mineral hosted-melt inclusions. The 660 year B.P. Ice Springs flow in central Utah is a small (20 km2) primitive basalt with less than 1% phenocrysts of olivine, plagiocl...
Article
Melt inclusion compositional variability in conjunction with inclusion host and whole rock geochemistry can provide insight into both magma source variability and the timing of contamination and (or) melt aggregation relative to crystallization. Paricutin Volcano (Mexico) is often cited as a classic example of assimilation and fractional crystalliz...
Article
We review published radiogenic isotope data (>350 samples in total) on various suites of magmatic rocks within the Palaeogene central East Greenland flood basalt province to evaluate the types of crustal assimilants and the extent of crustal assimilation involved in each suite. We use these observations to build a regional picture of how magmatic p...
Article
We present new compositional data on a suite of historic lava flows from the Reykjanes Peninsula, Iceland. They were erupted over a short time period between c. 940 and c. 1340ad and provide a snap-shot view of melt generation and evolution processes beneath this onshore, 65km long, ridge segment. The lavas are tholeiitic basalts (MgO 6.5–9.2wt%) a...
Article
Full-text available
The Palaeogene Kangerlussuaq Intrusion (∼50 Ma) of East Greenland displays concentric zonation from quartz-rich nordmarkite (quartz syenite) at the margin, through pulaskite, to foyaite (nepheline syenite) in the centre; modal layering and igneous lamination are locally developed but there are no internal intrusive contacts. This is an apparent vio...
Article
Full-text available
Mantle xenoliths in Neogene alkali basalts of the Bakony–Balaton Highland Volcanic Field (Western Hungary) frequently have melt pockets that contain silicate minerals, glass, and often carbonate globules. Textural, geochemical and thermobarometric data indicate that the melt pockets formed at relatively high pressure through breakdown of mainly amp...
Article
We present high precision Ir, Ru, Pt, Pd, Re and rare earth element (REE) determinations by isotope dilution multiple collector-ICP-MS on the Cretaceous-Tertiary boundary sedimentary reference material FC-1. Samples for platinum-group element measurements were digested in Carius tubes followed by acid digestion. The platinum-group elements were sub...
Article
Full-text available
We present a detailed textural and compositional study of two orthopyroxene-rich olivine websterites. One occurs as a vein in a harzburgite xenolith and the other is an individual xenolith, both found at Szentbékkálla in the Bakony–Balaton Highland Volcanic Field (central Pannonian Basin, western Hungary). The textural features of these orthopyroxe...
Article
Secondary carbonate deposits in caves, known as speleothems, preserve a variety of palaeoenvironmental signals. The coastal caves of Mallorca display an unusual type of carbonate encrustation that enables a test of the Milankovitch theory of Earth's orbital forcing on global ice-volume fluctuations ~80 thousands years (kyr) ago. Here we reconstruct...
Article
We present new mineral and whole-rock compositions and Sr–Nd–Hf–Pb–O–H isotope data on samples from the Kangerlussuaq Alkaline Complex (∼ 1000 km2) in central East Greenland, part of the North Atlantic Igneous Province. This complex mainly consists of the Kangerlussuaq Intrusion but includes at least 13 separate satellite intrusions emplaced in the...
Article
Neodymium and high-precision lead isotopic data are presented for Paleogene East Greenland flood basalts that erupted during an early phase of magmatic activity associated with the Iceland hotspot. The 6-km-thick volcanic sequence shows marked chemostratigraphic variations: lavas in the lower half of the sequence (Milne Land and Geikie Plateau Form...
Article
Evaluating the potential role of crustal assimilation in modifying the compositions of flood basalt magmas is critical if we are to better understand the ultimate mantle origins and tectonic driving forces behind these immense episodes of melting. This question is particularly important for flood basalts such as the Early Cretaceous Paraná-Etendeka...