Travis J. TennerLos Alamos National Laboratory | LANL
Travis J. Tenner
PhD
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71
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Introduction
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August 2010 - September 2015
Publications
Publications (71)
We present detailed electron microprobe analyses and oxygen three-isotope measurements by high precision secondary ion mass spectrometry on 45 type I (FeO-poor) chondrules/fragments and 3 type II (FeO-rich) chondrule fragments from Meteorite Hills 00426 and Queen Alexandra Range 99177, two of the most primitive CR3 chondrites. Type I chondrules/fra...
The presence of excess Si in An-rich chondrule plagioclase indicates retention of primary crystallization features, meaning Al-Mg isotope systematics are sound.
We present experimental determinations of the influence of
H2O on partial melting of garnet peridotite (+1.5, 2.5, and 5
wt. % added H2O) at 3.5 GPa and 1200-1450°C. Experiments
produced complex polyphase regions of quenched melt and equilibrium
partial melt compositions were reconstructed by combined EMP and
LA-ICP-MS analyses. Mass balance-derive...
High-precision oxygen three-isotope measurements of olivine and pyroxene were performed on 33 chondrules in the Yamato 81020 CO3.0 chondrite by secondary ion mass spectrometry. In chondrules where oxygen isotopes were measured in both olivine and pyroxene, the majority of grains have similar values, indicating co-magmatic crystallization. However,...
To investigate the influence of chemical composition on the behavior of H2O in Fe-rich nominally anhydrous minerals, and to determine the difference between H2O behavior in the martian and terrestrial mantles, we conducted high-pressure H2O storage capacity experiments employing a wide range of olivine compositions. Experiments were conducted with...
Deciphering the spatial and temporal evolution of chondrules allows for a better understanding of how asteroidal seeds formed, migrated, and eventually accreted into parent asteroids. Here we report high precision Al-Mg ages and oxygen three-isotope ratios of fifteen FeO-poor chondrules from the least metamorphosed Mighei-like (CM) and Ornans-like...
Magnesium stable isotope ratios and minor element abundances of five olivine particles from comet 81P/Wild 2 were examined by secondary ion mass spectrometry (SIMS). Wild 2 olivine particles exhibit only small variations in δ25Mg values from –1.0 +0.4/–0.5‰ to 0.6 +0.5/–0.6‰ (2σ). This variation can be simply explained by mass-dependent fractionati...
Al-Mg isotope systematics of twelve FeO-poor (type I) chondrules from CR chondrites Queen Alexandra Range 99177 and Meteorite Hills 00426 were investigated by secondary ion mass spectrometry (SIMS). Five chondrules with Mg#'s of 99.0 to 99.2 and Δ17O of -4.2‰ to -5.3‰ have resolvable excess 26Mg. Their inferred (26Al/27Al)0 values range from (3.5 ±...
We review recent chondrule oxygen isotope studies by secondary ion mass spectrometry (SIMS). We discuss primary O-isotope fractionation characteristics of chondrule phases, and how they are used to garner information related to the physicochemical environment from which they formed. This includes high temperature gas-melt interactions, sampling of...
Cambridge Core - Planetary Science and Astrobiology - Chondrules - edited by Sara S. Russell
In order to explore the link between comet 81P/Wild 2 and materials in primitive meteorites, seven particles 5 to 15 μm in diameter from comet 81P/Wild 2 have been analyzed for their oxygen isotope ratios using a secondary ion mass spectrometer. Most particles are single minerals consisting of olivine or pyroxene with Mg# higher than 85, which are...
Calcium-aluminum-rich inclusions (CAIs) are the oldest dated objects that formed inside the Solar System. Among these are rare, enigmatic objects with large mass-dependent fractionation effects (F CAIs), which sometimes also have large nucleosynthetic anomalies and a low initial abundance of the short-lived radionuclide ²⁶Al (FUN CAIs). We have stu...
High-precision secondary ion mass spectrometry (SIMS) was employed to investigate oxygen three isotopes of phenocrysts in 35 chondrules from the Yamato (Y) 82094 ungrouped 3.2 carbonaceous chondrite. Twenty-one of 21 chondrules have multiple homogeneous pyroxene data (∆17O 3SD analytical uncertainty: 0.7‰); 17 of 17 chondrules have multiple homogen...
In order to further elucidate possible temporal relationships between different varieties of calcium-, aluminum-rich inclusions (CAIs), we measured the aluminum-magnesium isotopic systematics of seven examples of the rare type known as forsterite-bearing Type B (FoB) inclusions from four different CV3 carbonaceous chondrites: Allende, Efremovka, NW...
Oxygen isotope ratios and corresponding ²⁶Al-²⁶Mg isotope systematics of refractory inclusions from the least metamorphosed carbonaceous chondrites, Acfer 094 (C-ungrouped 3.00) and Yamato 81020 (CO3.05), were measured with an ion microprobe. Most of the samples are fine-grained refractory inclusions which are considered as condensates from high te...
High precision electron microprobe analyses were obtained on olivine grains from Klyuchevskoy, Shiveluch and Gorely volcanoes in the Kamchatka Arc; Irazú, Platanar, Barva volcanoes of the Central American Arc; and mid-ocean ridge basalt (MORB) from the Siqueiros Transform. Calcium contents of these subduction zone olivines are lower than those for...
Volatile-rich and typically oxidized carbonaceous chondrites, such as CV and CM chondrites, potentially respond to impacts differently than do other chondritic materials. Understanding impact melting of carbonaceous chondrites has been hampered by the dearth of recognized impact melt samples. In this study we identify five carbonaceous chondrite im...
PLACs (platy hibonite crystals) and related hibonite-rich calcium-, aluminum-rich inclusions (CAIs; hereafter collectively referred to as PLAC-like CAIs) have the largest nucleosynthetic isotope anomalies of all materials believed to have formed in the solar system. Most PLAC-like CAIs have low inferred initial ²⁶Al/²⁷Al ratios and could have forme...
We report oxygen, calcium, titanium and 26Al-26Mg isotope systematics for spinel-hibonite inclusions (SHIBs), a class of calcium-aluminum-rich inclusions (CAI) common in CM chondrites. In contrast to previous studies, our analyses of 33 SHIBs and four SHIB-related objects obtained with high spatial resolution demonstrate that these CAIs have a unif...
A large abundance of L-chondritic material, mainly in the form of fossil meteorites and chromite grains from micrometeorites, has been found in mid-Ordovician 470 Ma old sediments globally. The material has been determined to be ejecta from the L chondrite parent body breakup event, a major collision in the asteroid belt 470 Ma ago. In this study w...
High-precision oxygen three-isotope ratios were measured for four mineral phases (olivine, low-Ca and high-Ca pyroxene, and plagioclase) in equilibrated ordinary chondrites (EOCs) using a secondary ion mass spectrometer. Eleven EOCs were studied that cover all groups (H, L, LL) and petrologic types (4, 5, 6), including S1–S4 shock stages, as well a...
Oxygen isotope analyses of chondrules in type 3 clasts in R chondrite breccias suggest similar isotope reservoirs for chondrules in O and R chondrites.
Development of an FIB-marking protocol coupled with a modified deflector board to improve aiming of small particules with 100 nm precision.
With our identification of the first vestan mantle samples, we can directly examine the evolution of Vesta in ways that were previously not possible.
Chondrules in R3 clast from NWA 753 (R3-5) breccia show oxygen isotope
ratios similar to those in LL3 chondrites. Δ^17O values of most
chondrules distribute between 0‰ and +1.5‰, significantly
lower than that of bulk R chondrites (~2.7‰).
We investigated the 26Al–26Mg systematics of type I (FeO-poor) chondrules from one of the most primitive carbonaceous chondrites, Acfer 094. The inferred initial 26Al/27Al ratios of chondrules from Acfer 094 ranged from (4.2 ± 2.0) × 10−6 to (9.0 ± 1.5) × 10−6. These chondrules have distinct oxygen isotope ratios (Δ17O: −5‰, −2‰, and 0‰), though no...
The Mifflin meteorite fell on the night of April 14, 2010, in
southwestern Wisconsin. A bright fireball was observed throughout a wide
area of the midwestern United States. The petrography, mineral
compositions, and oxygen isotope ratios indicate that the meteorite is a
L5 chondrite fragmental breccia with light/dark structure. The meteorite
shows...
A highly unequilibrated R3 clast from NWA 753 (R3-6) chondrite contains
a variety of chondrules with Mg# of 100-67. It may correspond to subtype
3.15--3.2.
The H2O storage capacities of peridotitic minerals place crucial constraints on the onset of hydrous partial melting in the mantle. The storage capacities of minerals in equilibrium with a peridotite mineral assemblage ("peridotite-saturated" minerals) are lower than when the minerals coexist only with fluid because hydrous partial melt is stabiliz...
QUE 99177 chondrules steadily rise in Δ^1^7O (-5 to -1
‰) as Mg# decreases (99 to 97). Addition of +Δ1^7O H_2O ice
to dry precursors could reduce chondrule Mg# (by oxidation during
formation) while increasing Δ^1^7O. Estimated H_2O ice
Δ^1^7O is 0.5 to 6‰.
The onset of hydrous partial melting in the mantle above the transition zone is dictated by the H2O storage capacity of peridotite, which is defined as the maximum concentration that the solid assemblage can store at P and T without stabilizing a hydrous fluid or melt. H2O storage capacities of minerals in simple systems do not adequately constrain...
Mineral compositions and oxygen isotope ratios of chondrules from Y-81020 (CO3.0) were investigated. Bimodal distribution of O isotopic ratios may suggest two distinct reservoirs within the carbonaceous chondrule-forming region.
The Mifflin meteorite fell as a shower at night on April 14, 2010, in Wisconsin, USA. Petrology, mineral chemistry, and oxygen-isotope data indicate Mifflin is a L5 chondrite showing a brecciated texture of light clasts and a dark matrix.
Low shear-wave velocity regions atop the 410 km discontinuity are widespread regional features that remain poorly understood. Numerous seismic studies, principally using receiver functions and ScS reverberations, have detected anomalously slow regions in the 20-50 km thick interval above the 410 km discontinuity. Because these regions are commonly...
The onset of dehydration melting of nominally anhydrous peridotite can be calculated by combination of appropriate mineral/melt partition coefficients for H2O D-H(min/liq), and a parameterization of the influence of the H2O content of melt on the solidus of peridotite. Thermodynamic models predict that olivine/melt partitioning, D-H(ol/liq), should...
To extend our knowledge of partitioning of hydrogen between nominally anhydrous mantle minerals and basaltic melts to higher pressures, we conducted 8 experiments at 3–5 GPa and 1350–1440 °C on a modified mid-ocean ridge basalt (MORB) + 2 wt.% H2O. H contents in olivine, orthopyroxene, clinopyroxene, and garnet were measured by counting 16O1H ions...
Experimental determinations of the effect of Mg# on H2O storage capacity in olivine + opx suggests that extraction of H2O from the martian mantle is similar to that of a LREE. By analogy to K we infer that ~50% of martian H2O remains in its mantle.
Electron microprobe analyses of major- and minor-element oxide components for two glassed samples of natural KLB-1 peridotite
are presented. One glass was made with the aid of a phosphate flux, and the second glass was made by laser melting of aerodynamically
levitated spheroids resulting in homogeneous silicate glass beads. For unknown reasons, th...
We have investigated the influence of water on partial melting of fertile garnet peridotite by performing experiments with a hydrated synthetic peridotite at 3 GPa. The starting material consists of a synthetic KLB-1 peridotite analog mixed in varying ratios with a synthetic hydrous olivine composition (Mg# of 83 + 10% H2O) to produce starting mate...
Experimental brackets on the melting temperature of high albite (NaAlSi3O8) were determined at 2.33 ± 0.03 GPa (1360-1370 °C) and 2.79 ± 0.03 GPa (1370-1389 °C) in a piston-cylinder apparatus. All run products that quenched to a glass were analyzed by Fourier-transform infrared spectroscopy and found to contain ≤500 ppm H2O. In addition, new X-ray...
Brackets on the melting temperature of K2CO3 were experimentally determined at 1.86 ± 0.02 GPa (1,163–1,167°C), 2.79 ± 0.03 GPa (1,187–1,195°C), and 3.16 ± 0.04 GPa (1,183–1,189°C) in a piston-cylinder apparatus. These new data, in combination with published experiments at low pressure (2CO3 fusion curve to 3.2 GPa. On the basis of these experiment...
An equation of state (P-V-T relation) for carbonate liquids is of considerable geological interest despite the fact that carbonate magmas are volumetrically sparse compared to other igneous rocks. They are efficient agents of mantle metasomatism because of their high mobility and high concentrations of incompatible trace elements. They are also fre...