Geochemical behaviours of chemical elements during subduction-zone metamorphism and geodynamic significance (original) (raw)

Crocket et al Chem Geol 2014 - Appendix

O/ 16 O ratios vs. pyrometer reading (°C). The grey data points are individual cycles from each of 12 filaments, the open circles are averages per filament, and the black squares are the average of all 12 filaments. The horizontal error bars reflect the range in temperature per filament. The errors indicated on the average oxygen isotope ratios are 2SD (generally smaller than the data point).

GeoReM: A New Geochemical Database for Reference Materials and Isotopic Standards

Geostandards and Geoanalytical Research, 2005

Li and Si isotopic measurements and related reference materials GeoReM 84 Jochum K.P., Rehkämper M., Seufert H.M.| Geostandards Newsletter 18 (1) [1994] 43-51 Trace element analysis of basalt BIR-1 by ID-SSMS, HPLC and LIMS GeoReM 279 Rehkämper M., Frank M., Hein J.R., Porcelli D., Halliday A.N., Ingri J., Liebetrau V.| Earth Planet. Sci. Lett. 197 [2002] 65-81 Thallium isotope variations in seawater and hydrogenetic, diagenetic, and hydrothermal ferromanganese deposits GeoReM 61 Weyer S., Münker C., Rehkämper M., Mezger K.| Chem. Geol. 187 [2002] 295-313 Determination of ultra-low Nb, Ta, Zr and Hf concentr. and the chondritic Zr/Hf and Nb/Ta ratios by isot. dil. anal. with multiple collector ICP-MS GeoReM 116 Wombacher F., Rehkämper M.| Geostandards and Geoanalytical Research 28 (1) [2004] 173-178

Penman et al 2013 Chemical Geology

Boron, carbon, and oxygen isotopic composition of brachiopod shells: Intra-shell variability, controls, and potential as a paleo-pH recorder The boron isotopic composition of biogenic carbonates has been used to reconstruct seawater pH and atmospheric pCO 2 on Pleistocene and Cenozoic timescales. Because of their excellent preservation and extensive fossil record throughout the Phanerozoic, brachiopods are a promising candidate for extending the boron isotope record as far back as the Cambrian. Here we present stable carbon, oxygen, and boron isotopic measurements of modern Terebratulid brachiopod calcite in comparison with environmental pH estimates calculated from oceanographic data. Geochemical transects along the length and depth of single shells confirm previously published trends in carbon and oxygen isotopic composition. In the outer surface (primary and outermost secondary layers), δ 11 B covaries with δ 13 C and δ 18 O, with more negative values in the outer and more positive values in the middle of the shell. However, δ 11 B deviates from δ 13 C and δ 18 O in the inner part of the secondary layer, where the δ 13 C and δ 18 O values are more positive and near equilibrium, whereas δ 11 B returns to more negative values. A comparison of different specimens of the species Terebratalia transversa (Sowerby, 1846) and Laqueus californianus (Küster, 1844) microsampled from the middle part of the fibrous secondary layer demonstrates a clear correlation to ambient pH with a sensitivity similar to other empirical calibration curves for cultured planktic foraminifers, corals, and inorganic calcite. The relationship in other species is less clear and significantly offset, necessitating the use of a single species or a cross-calibration method with other species in paleo-pH reconstructions.

DOI 10.1515/pac-2013-1023 Pure Appl. Chem. 2014; 86(3): 425–467

2016

Assessment of international reference materials for isotope-ratio analysis (IUPAC Technical Report)1 Abstract: Since the early 1950s, the number of international measurement standards for anchoring stable isotope delta scales has mushroomed from 3 to more than 30, expanding to more than 25 chemical elements. With the development of new instrumentation, along with new and improved measurement procedures for studying naturally occurring isotopic abundance variations in natural and technical samples, the number of internationally distributed, secondary isotopic reference materials with a specified delta value has blossomed in the last six decades to more than 150 materials. More than half of these isotopic reference materials were

Pourmand et al 2014 Geology SI

1 1. Analytical methodology 2 1.1 Aerosol collection: The sample collector was positioned at the top of a 17-meter scaffold 3 tower whose base is 30 meters above sea level. To minimize the impact of local sources, the 4 sampler was controlled by a computer so that the pump was activated only when winds blow 5 from the sea. Daily aerosol samples were collected between 2003 and 2011 (Fig. DR1) using 20 6 x 25 cm Whatman 41 ashless filters (W-41, Sigma-Aldrich part # Z241377-1PAK) with 7