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Zamponi Joaquin Giannetti Andrea Bovino Stefano Sabatini Giovanni Schleicher Dominik R. G. Krtgen Bastian Reissl Stefan Wolf Sebastian 《Astrophysics and Space Science》2022,367(6):1-9
Astrophysics and Space Science - Dynamical evolution of galaxies is a complex process, especially the centers. Gravitationally coupled gas and stellar discs have been observed to coexist in the... 相似文献
203.
Trace Element Determination of Single Fluid Inclusions in Quartz by Laser Ablation ICP-MS 总被引:4,自引:0,他引:4
Tom E. McCandless David J. Lajack Joaquin Ruiz A. Mohammad Ghazi 《Geostandards and Geoanalytical Research》1997,21(2):279-287
Single fluid inclusions in quartz from a Pb-Zn-Ag carbonate replacement deposit were selected for trace element determination by laser ablation ICP-MS. Spikes in element intensities were noted between first breached fluids versus subsequent analyses, suggesting that accurate element concentrations may not be determined in smaller fluid inclusions when only one analysis is obtained before the fluid is exhausted. Elemental concentrations in the fluid inclusions were determined by external standardisation using solutions sealed in microcapillary tubes. Standards and single natural inclusion analyses give repeatabilities (%RSD) of ˜ 20% for Rb and Sr. Rubidium and strontium concentrations range from 0.56-5.07 μg ml-1 and 1.12-27.4 μg ml-1 , respectively, whereas Zn and Ag are below detection limits (< 10 ng ml-1 ). The results suggest that nearly all Zn and Ag are removed by the time hydrothermal fluids precipitate gangue minerals. 相似文献
204.
The isotopic evolution of δ13C and δ18O is reported for the Jurassic and early Cretaceous in two pelagic sections of the External Zones in the Betic Cordilleras (SE Spain). Stable isotope curves from pelagic trough and swell sections display similar patterns. Variations in δ18O and δ13C values from strata at equivalent age probably reflect both early diagenetic cementation and later temperature‐related burial diagenesis. Comparison of global isotope curves with those presented in this work allows the differentiation of global from local events. Thus, the anoxic event during the early Toarcian (falciferum Zone) is characterized by elevated δ13C and depressed δ18O values. The isotopic record also allows the detection of the middle Oxfordian transgression. There are other peaks for the late Toarcian, early Bajocian, Callovian and early Berriasian that can also be used as tools for correlation purposes. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献