Abstract Tracing and identifying recycled carbonates is a key issue to reconstruct the deep carbon cycle. To better understand carbonate subduction recycling beneath southeastern Tibetan Plateau, high‐K cal‐alkaline volcanic rocks including trachy‐basalts trachy‐andesites from Tengchong were studied using Mg Ca isotopes. The low δ 26 (−0.31 ± 0.03‰ −0.38 0.03‰) 44/40 (0.67 0.07‰ 0.80 0.04‰) values of these compared those mantle (−0.25 0.94 0.05‰, respectively) indicate incorporation...

Abstract Mantle peridotites show that Ca is isotopically heterogeneous in Earth's mantle, but the mechanism for such heterogeneity remains obscure. To investigate effect of partial melting on isotopic fractionation and we report high‐precision compositions normal Mid‐Ocean Ridge Basalts (N‐MORB) from southern Juan de Fuca Ridge. δ 44/40 these N‐MORB samples display a small variation ranging 0.75 ± 0.05 to 0.86 0.03‰ (relative NIST SRM 915a, standard reference material produced by National...

High‐precision calcium isotopic compositions of a set geological reference materials from the IAG ( OU ‐6), ANRT UB ‐N), MPI ‐ DING , USGS and GSJ relative to NIST SRM 915a, are reported here. Measurements were performed by thermal ionisation mass spectrometry (Triton instrument) using 42 Ca– 43 Ca double spike. δ 44/40 values selected materials, mainly felsic rocks, for first time. Felsic rock ranged 0.13‰ 1.17‰, probably implying fractionation could occur during magma evolution. ultramafic...

Significant isotopic fractionation can occur during column chemistry and determination by mass spectrometry. Improper correction may produce uncertainties in the composition of geological samples. We investigated calcium these two processes set up a model to check data quality. The δ 44/40 Ca 915a value IAPSO seawater different cuts (e.g., 0–20, 20–40, 40–60, 60–80 80–100%) on ranged from ~ 4‰ 0‰. more was eluted, lower elution found. appeared follow exponential law. However, TIMS...

Calcium (Ca), strontium (Sr), barium (Ba), cerium (Ce), and neodymium (Nd) isotopes have broad applications in the Earth planetary sciences. Usually, only one specific element is separated using an...

We propose a “peak cut” procedure of column separation for calcium isotope measurement using the double spike technique and thermal ionization mass spectrometry (TIMS).

Measurement of Ba isotope ratios widely available reference materials is required for interlaboratory comparison data. Here, we present new data thirty‐four geological materials, including silicates, carbonates, river/marine sediments and soils. These (RMs) cover a wide range compositions, with mass fractions ranging from 6.4 to 1900 µg g −1 , SiO 2 0.62% 90.36% m / MgO 0.08% 41.03% . Accuracy precision our were assessed by the analyses duplicate samples USGS rock RMs. Barium isotopic...

In this study, to evaluate whether bias free Ca isotope ratios can be properly achieved by thermal ionisation mass spectrometry ( TIMS ) using the 42 Ca– 43 double‐spike technique without chemical purification, a series of comparable experiments (with or column chemistry) were made on Ca‐dominated minerals and rocks. Minerals, including fluorite, calcite, titanite apatite, displayed similar with Δ 44/40 with‐without ranging from −0.02 +0.07‰. For Ca‐rich rocks, we mainly focused carbonates...

High‐precision calcium isotopic ratios of thirty‐four Chinese geological reference materials, including igneous, metamorphic and sedimentary rocks, river/marine sediments soils, are reported. Measurements were conducted by thermal ionisation mass spectrometry (Triton TIMS) using a 42 Ca– 43 Ca double spike. These materials cover wide range chemical compositions with CaO ranging from 0.10 to 51.1% m / . The δ 44/40 variation igneous rocks was up 0.75‰, 0.61 ± 0.06‰ 1.35 0.04‰. Two yielded...

Abstract Changbaishan volcano (CBV), located on the border between China and North Korea, has undergone violent eruptions since Oligocene, making it one of most captivating explosive volcanoes Earth. However, lack precise characterization regarding magmatic system makes difficult to decipher its eruption risk mechanism, despite significant size past devastating effects. In this study, we employed newly developed teleseismic receiver function techniques, including Ps Sp waves, construct a...

Magnesium isotope ratios in carbonate rocks and minerals play an important role tracing geological biological processes. We report δ 26 Mg DSM3 values for the first time ten reference materials (GBW07865, GBW07114, GBW(E)070159, GBW07136, GBW07108, GBW03109a, GBW07120, GBW07214a, IAEA‐B‐7 IAEA‐CO‐8) with calcium to magnesium mass around 1300 g −1 ultra‐low fractions of 295 μg . A combination AG MP‐50 (100–200 mesh) 50W‐X12 (200–400 resins matrix extraction multi‐collector inductively coupled...

Diatomite (DE) is a widely used adsorption material in wastewater treatment due to its cost-effectiveness, high porosity, and stability. To improve properties, we synthesized biopolymeric ferric sulfate (BPFS) through biocatalytic oxidation, known for efficient removal of organic compounds. In this study, prepared novel adsorbent, sulfate-modified diatomite (BPFS-DE), by modifying DE with BPFS. We characterized BPFS-DE using various techniques, including scanning electron microscopy (SEM), N...

Abstract Light stable isotopes ( δ 13 C, 15 N, 2 H, and 18 O) of Ectropis grisescens (a leaf-eating pest) were measured at different developmental stages. Isotope values larval instars, pupae, adult tissues determined to understand fractionation patterns life stages evaluate the tropic shift from food insect excrement. The insect’s C tissue significantly enriched relative its diet, whereas feces depleted compared dietary input. Similarly, N pest diet this enrichment was most likely due...

We report the δ 142/140 Ce values for thirty‐three widely available geological reference materials (RMs), including igneous rocks, metamorphic sediments and soils. The isotope ratios of twenty‐two Chinese RMs are reported first time. After chemical purification using TODGA resin (50–100 μm, Eichrom, USA), measurements these were conducted by multi‐collector inductively coupled plasma‐mass spectrometry (MC‐ICP‐MS) with a combined standard‐sample bracketing (SSB) Sm‐doping technique. data...

Chinese glass has a history of thousands years, and ancient is valuable material evidence early cultural exchanges trade between China the West. With continuous development economy technology, scholars have made deeper research on composition, but at present, most works in focus chemical point view detection technology exchanges, less statistical law identification classification. In this paper, relationship weathering, ornamentation, colour type surface analyzed by correspondence analysis....