منابع مشابه
Triple oxygen isotopic composition of the high-He/He mantle
Measurements of Xe isotope ratios in ocean island basalts (OIB) suggest that Earth’s mantle accreted heterogeneously, and that compositional remnants of accretion are sampled by modern, high-He/He OIB associated with the Icelandic and Samoan plumes. If so, the high-He/He source may also have a distinct oxygen isotopic composition from the rest of the mantle. Here, we test if the major elements ...
متن کاملThe Absolute Isotopic Composition and Atomic Weight of Terrestrial Nickel
Twenty-nine samples of high-purity nickel metals, reagent salts and minerals, collected from worldwide sources, have been examined by high-precision isotope ratio mass spectrometry for their nickel isotopic composition. These materials were compared directly with SRM 986, certified isotopie standard for nickel, using identical measurement techniques and the same instrumentation. This survey sho...
متن کاملTracking the lithium isotopic evolution of the mantle using carbonatites
Carbonatites are mantle-derived, intraplate magmas that provide a means of documenting isotopic variations of the Earth's mantle through time. To investigate the secular Li isotopic evolution of the mantle and to test whether Li isotopes document systematic recycling of material processed at or near the Earth's surface into the mantle, we analyzed the Li isotopic compositions of carbonatites an...
متن کاملControls on the solubility of rhenium in silicate melt: Implications for the osmium isotopic composition of Earth’s mantle
The solubility of Re and Au in haplobasaltic melt has been investigated at 1673–2573 K, 0.1 MPa–2 GPa and IW 1 to þ2.5, in both carbon-saturated and carbon-free systems. Results extend the existing, low pressure and temperature, dataset to more accurately predict the results of metal-silicate equilibrium at the base of a terrestrial magma ocean. Solubilities in run-product glasses were measured...
متن کاملThe chlorine isotope composition of Earth's mantle.
Chlorine stable isotope compositions (delta37Cl) of 22 mid-ocean ridge basalts (MORBs) correlate with Cl content. The high-delta37Cl, Cl-rich basalts are highly contaminated by Cl-rich materials (seawater, brines, or altered rocks). The low-delta37Cl, Cl-poor basalts approach the composition of uncontaminated, mantle-derived magmas. Thus, most or all oceanic lavas are contaminated to some exten...
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ژورنال
عنوان ژورنال: Geochimica et Cosmochimica Acta
سال: 2017
ISSN: 0016-7037
DOI: 10.1016/j.gca.2016.11.016