1,721,232 research outputs found
Oxygen isotope data and mass scans
No full textTriple oxygen isotope data of terrestrial and lunar samples along with mass scans of the respective O2 gase
Data of triple iron and oxygen isotopes of cosmic spherules
No full textThese are iron and triple oxygen isotope data of cosmic spherules and terrestrial mineral samples analyzed in the same run
Silicon isotope data
No full textTable with silicon isotope data of standards and sponge spicules for G-cubed manuscript
CHONDRULES IN LL3 CLUSTER CHONDRITES: EVIDENCE FOR INTERACTION OF CHONDRULE MELTS WITH NEBULAR GAS.
No full textThe triple oxygen isotope composition of the Earth mantle and understanding Delta O-17 variations in terrestrial rocks and minerals
No full textIt has been shown in numerous studies that terrestrial rocks and minerals fall on a line with slope similar to 0.52 in a delta O-17 vs. delta O-18 diagram. In this study, we present new data on the triple isotope composition of the Earth mantle, crustal materials and low-T aqueous precipitates. Crustal materials show distinct variations in Delta O-17 suggesting that the concept of a single terrestrial mass fractionation is invalid on small-scale. Observable variations in individual fractionation slopes theta are interpreted as temperature effects. We show that the Earth mantle is isotopically homogeneous and confirm the recent finding that the Earth mantle has a negative Delta O-17. The difference in delta O-18 and Delta O-17 between seawater and oceanic crust is discussed with respect to the effects of low- and high-temperature water-rock interaction. (C) 2014 Elsevier B.V. All rights reserved
INFLUENCE OF FEO ON THE PARTITIONING OF NA BETWEEN OLIVINE AND SILICATE MELT-IMPLICATIONS FOR THE BEHAVIOR OF ALKALIS DURING CHONDRULE FORMATION
No full textTriple oxygen isotope mass balance for the Earth's oceans with application to Archean cherts
No full textThe oxygen isotope composition of the Earth's oceans is buffered by high- and low-T exchange with the lithosphere. We present a triple oxygen isotope mass balance model for the Earth's oceans. The model is based on triple oxygen isotope measurements of rocks from various reservoirs including high- and low-T alteration products. The modern ocean water composition can be well-matched if the ratio between continental weathering and high-T seafloor alteration is ~25% higher than previously assumed. The mass balance suggests that putative Precambrian low-δ18O ocean water would fall on a trend with slope λ = 0.51 passing through “modern” ice-free-world seawater. Exemplified application to a published Phanerozoic and Archean chert data suggest precipitation in cool oceans with modern-like δ18O followed by diagenetic alteration with involvement of meteoric water
INFLUENCE OF FEO ON THE PARTITIONING OF NA BETWEEN OLIVINE AND SILICATE MELT-IMPLICATIONS FOR THE BEHAVIOR OF ALKALIS DURING CHONDRULE FORMATION
No full textPartitioning of Ca and Al between forsterite and silicate melt in dynamic systems with implications for the origin of Ca, Al-rich forsterites in primitive meteorites
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