共查询到20条相似文献，搜索用时 468 毫秒
1.
NanoSIMS: Technical Aspects and Applications in Cosmochemistry and Biological Geochemistry 总被引：2，自引：0，他引：2
Peter Hoppe Stephanie Cohen Anders Meibom 《Geostandards and Geoanalytical Research》2013,37(2):111-154
The NanoSIMS ion probe is a new‐generation SIMS instrument, characterised by superior spatial resolution, high sensitivity and multi‐collection capability. Isotope studies of certain elements can be conducted with 50–100 nm resolution, making the NanoSIMS an indispensable tool in many research fields. We review technical aspects of the NanoSIMS ion probe and present examples of applications in cosmochemistry and biological geochemistry. This includes isotope studies of presolar (stardust) grains from primitive meteorites and of extraterrestrial organics, the search for extinct radioactive nuclides in meteoritic materials, the study of lunar samples, as well as applications in environmental microbiology, cell biology, plant and soil science, and biomineralisation. 相似文献
2.
AN ION PROBE CONTRIBUTION TO RARE EARTH ELEMENT INVESTIGATION OF GABBRO GOG-1 USING SECONDARY ION MASS SPECTROMETRY 总被引：1，自引：0，他引：1
Luisa OTTOLINI Piero BOTTAZZI Riccardo VANNUCCI Massimo ODDONE 《Geostandards and Geoanalytical Research》1992,16(1):13-19
An updated REE measurement of Gabbro GOG-1 was carried out by means of secondary ion mass spectrometry (SIMS). The availability of high amount of rock powder allowed the sample to be well ground and homogenized before analysis. Fused glass pellets were employed for SIMS investigations. REE data were compared with new ICP-AES and NAA analyses. REE results from all employed analytical techniques show good agreement and are consistent with in-situ SIMS measurements of REE in major mineral phases forming GOG-1. Extensive homogeneity tests seem to confirm the possibility to using this rock as a reference material for earth sciences. 相似文献
3.
高精度第四纪年代学是第四纪研究的基础,对了解地球演化和发展非常关键。大型二次离子质谱(SIMS)锆石U-Th-Pb定年方法,集高空间分辨率、高精度、高效率和近无损分析等优势于一体,可以提取矿物微区中记录的丰富地质信息,在第四纪年代学研究中具有很大的应用潜力。文中对SIMS第四纪锆石原位微区年龄测定的基本原理、分析校正方法进行介绍,并报道我们测定台湾第四纪金瓜石英安岩锆石U-Pb年龄的结果((1.166±0.020)Ma)。 相似文献
4.
Allen K. Kennedy Jörn-Frederik Wotzlaw James L. Crowley Mark Schmitz Urs Schaltegger Benjamin Wade Laure Martin Cristina Talavera Bryant Ware Thi Hao Bui 《Geostandards and Geoanalytical Research》2023,47(2):373-402
Twelve apatite samples have been tested as secondary ion mass spectrometry (SIMS) reference materials. Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) analysis shows that the SLAP, NUAN and GR40 apatite gems are internally homogeneous, with most trace element mass fractions having 2 standard deviations (2s) ≤ 2.0%. BR2, BR5, OL2, AFG2 and AFB1, which have U > 63 μg g-1, 206Pb/204Pb > 283, and homogeneous SIMS U-Pb data, have respective isotope dilution thermal ionisation mass spectrometry (ID-TIMS) ages of 2053.83 ± 0.21 Ma, 2040.34 ± 0.09 Ma, 868.87 ± 0.25 Ma, 478.71 ± 0.22 Ma and 473.25 ± 0.09 Ma. Minor U-Pb heterogeneity exists and accurate SIMS results require correction with the 3D Concordia-constrained common Pb composition. Among the studied samples, AFG2 and BR5 are the most homogeneous U-Pb reference materials. The SIMS sulfur isotopic compositions of eight of the apatites shows they are homogeneous, with 2s for both 103δ34S and 103δ33S < 0.55‰. One apatite, BR96, has Δ33S = -0.36 ± 0.2‰. The apatite samples have ID-TIMS 87Sr/86Sr between 0.704214 ± 0.000030 and 0.723134 ± 0.000035. 相似文献
5.
Katharina Marger Matthieu Harlaux Andrea Rielli Lukas P. Baumgartner Andrea Dini Barbara L. Dutrow Anne‐Sophie Bouvier 《Geostandards and Geoanalytical Research》2020,44(3):593-615
Six tourmaline samples were investigated as potential reference materials (RMs) for boron isotope measurement by secondary ion mass spectrometry (SIMS). The tourmaline samples are chemically homogeneous and cover a compositional range of tourmaline supergroup minerals (primarily Fe, Mg and Li end‐members). Additionally, they have homogeneous boron delta values with intermediate precision values during SIMS analyses of less than 0.6‰ (2s). These samples were compared with four established tourmaline RMs, that is, schorl IAEA‐B‐4 and three Harvard tourmalines (schorl HS#112566, dravite HS#108796 and elbaite HS#98144). They were re‐evaluated for their major element and boron delta values using the same measurement procedure as the new tourmaline samples investigated. A discrepancy of about 1.5‰ in δ11B was found between the previously published reference values for established RMs and the values determined in this study. Significant instrumental mass fractionation (IMF) of up to 8‰ in δ11B was observed for schorl–dravite–elbaite solid solutions during SIMS analysis. Using the new reference values determined in this study, the IMF of the ten tourmaline samples can be modelled by a linear combination of the chemical parameters FeO + MnO, SiO2 and F. The new tourmaline RMs, together with the four established RMs, extend the boron isotope analysis of tourmaline towards the Mg‐ and Al‐rich compositional range. Consequently, the in situ boron isotope ratio of many natural tourmalines can now be determined with an uncertainty of less than 0.8‰ (2s). 相似文献
6.
Rare earth elements were determined by secondary ion mass spectrometry (SIMS) for 12 igneous rocks and one feldspar separate from the new rock reference samples of the Geological Survey of Japan. The study presents an expanded application of the SIMS facility. 相似文献
7.
Etienne Deloule 《Geostandards and Geoanalytical Research》2006,30(3):175-182
This review of the literature from 2004 and 2005 concerning secondary ion mass spectrometry (SIMS) highlights the contribution the technique has made in the fields of petrology, geochronology, cosmochemistry and material sciences. In petrology, much research was devoted to the measurement of stable isotopes and trace elements by developments in multicollection acquisition, with emphasis on low atomic mass number elements. Elements studied in particular were S (in sulfides), O (in garnets), C (in sedimentary organic matter), Cl (in glasses) and Si. Novel applications of SIMS to geochronology have included the measurement of young zircon grains by the U-Pb and U-Th decay methods. An increasing number of studies have combined U-Pb geochronology with the measurement of trace elements or stable isotopes in zircon. 相似文献
8.
LA-(MC)-ICPMS和(Nano)SIMS硫化物微量元素和硫同位素原位分析与矿床形成的精细过程 总被引：8，自引：3，他引：5
硫化物微区原位分析技术包括LA-ICPMS定点微量元素分析、LA-ICPMS和(Nano) SIMS微量元素面扫描分析,以及SIMS、Nano SIMS和LA-MC-ICPMS原位硫同位素点分析和面扫描。这些分析方法可以有效地获取不同期次硫化物微量元素含量、丰度分布图像、硫同位素比值和分布特征,结合微区时间分辨信号谱图、微量元素相关性分析等,在矿床学的成矿元素行为与赋存状态、成矿元素置换反应、成矿流体与硫的来源、矿石矿物的化学分带性、矿床成因模型等研究中有着重要的应用前景,以探讨矿床的精细成矿过程。硫化物原位微量元素和同位素LA-(MC)-ICPMS和(Nano) SIMS分析,需要降低仪器和分析方法的系统误差,克服严重的基体效应和同位素分馏效应。 相似文献
9.
Guillaume Siron Lukas Baumgartner Anne‐Sophie Bouvier Benita Putlitz Torsten Vennemann 《Geostandards and Geoanalytical Research》2017,41(2):243-253
Five new biotite reference materials were calibrated at the SwissSIMS laboratory (University of Lausanne) for oxygen isotope determination by secondary ion mass spectrometry (SIMS) and are available to the scientific community. The oxygen isotope composition of the biotites, UNIL_B1 to B5, was determined by laser‐heating fluorination to be 11.4 ± 0.11‰, 8.6 ± 0.15‰, 6.1 ± 0.04‰, 7.1 ± 0.05‰ and 7.6 ± 0.04‰, respectively. SIMS analyses on spots smaller than 20 μm gave a measurement repeatability of 0.3‰ (2 standard deviation, 2s). The matrix effect due to solid solution in natural biotite could be expressed as a linear function of XMg and XF for biotite. No effect was found for different crystallographic orientations. SIMS analysis allows the oxygen isotope composition of biotite to be measured with a measurement uncertainty of 0.3–0.4‰ (2s) for biotites with similar major element compositions. A measurement uncertainty of 0.5‰ (2s) is realistic when F poor biotites (lower than 0.2% m/m oxides) within the compositional range of XMg of 0.3–0.9 were compared from different sessions. The linear correlation with F content offers a reasonable working curve for F‐rich biotites, but additional reference materials are needed to confirm the model. 相似文献
10.
Hisayoshi YURIMOTO Isao SAKAGUCHI Norimasa NISHIDA Shigeho SUENO 《Geostandards and Geoanalytical Research》1991,15(1):155-159
Trace level determination of nickel in silicate rock samples has been achieved using secondary ion mass spectrometry (SIMS) with kinetic energy filtering. Standard rock references, issued by the Geological Survey of Japan, were fused into glass and used as standards for the SIMS analysis. Due to interferences from the glass matrix, the secondary ion of mass 60 was only useful for Ni, although the secondary ion was interfered mainly by CaO+. The contributions of these molecular ions were deconvolved by a least squares regression. Good linear correlation between results after the deconvolution and the Ni concentration in the glass standards was obtained. The uncertainties of the SIMS analysis depend strongly on the degree of contribution of CaO+ molecular ion. Such a method of SIMS analysis is especially useful to study the detailed behavior of Ni on a micro-scale in Ca-poor materials. 相似文献
11.
应用SHRIMP铀-铅定年法研究腾冲地区中更新世英安岩的形成时代 总被引：1，自引：0，他引：1
腾冲火山岩群是我国著名的年轻火山岩群,前人主要采用K-Ar法、不平衡铀系等同位素定年方法研究该区火山岩的年龄并划分其喷发期次,采用K-Ar法获得腾冲火山岩0.013~17.84 Ma的年龄以及0.13~2.9 Ma的等时线年龄,不平衡铀系法主要用于该地区0.23 Ma以来的样品年龄研究。传统的同位素定年体系的精确度和定年范围对于研究该区火山岩的年龄存有很大局限性。近年来,微区原位离子探针U-Pb定年在年轻地质体年代学研究中表现出巨大潜力,在国际上已经应用于中更新世晚期地质体的年龄测定。本文报道了应用锆石SHRIMP U-Pb定年方法对腾冲曲石地区中更新世英安岩的3次测定结果,3次实验的年龄值在误差范围内一致。在对一次离子流选择及其强度、二次离子积分时间等实验条件探讨的基础上,综合分析3次实验中的二次离子计数表明第3次实验结果具有更高的精确度,年龄值为0.41±0.01 Ma,属中更新世,代表该英安岩的形成时代,该年龄结果是目前我国获得的最年轻的高精度锆石SHRIMP U-Pb年龄。本研究获得的中更新世锆石U-Pb年龄为年轻地质体的年代学研究提供了新的思路。 相似文献
12.
Potential Orthopyroxene,Clinopyroxene and Olivine Reference Materials for In Situ Lithium Isotope Determination 总被引：1，自引：0，他引：1 
下载免费PDF全文
下载免费PDF全文 Ben‐Xun Su Xiao‐Yan Gu Etienne Deloule Hong‐Fu Zhang Qiu‐Li Li Xian‐Hua Li Nathalie Vigier Yan‐Jie Tang Guo‐Qiang Tang Yu Liu Kwan‐Nang Pang Aaron Brewer Qian Mao Yu‐Guang Ma 《Geostandards and Geoanalytical Research》2015,39(3):357-369
Over 1400 electron probe and 700 ion probe microanalyses were performed on eleven mineral separates to evaluate their potential as reference materials for in situ Li isotopic determination. Our results suggest the homogenous distributions of major elements, Li and its isotopes for each sample. Hence, these samples are suitable to be used as reference materials for in situ measurements of Li abundance and Li isotopes by secondary ion mass spectrometry (SIMS) or laser ablation‐inductively coupled plasma‐mass spectrometry (LA‐ICP‐MS). These samples have the advantage of mitigating probable matrix effects during calibration owing to the wide range of compositions. The effect of composition on the δ7Li of olivine measured by SIMS is a linear function of composition, with δ7Li increasing by 1.0‰ for each mole per cent decrease in forsterite component. 相似文献
13.
Reference Minerals for the Microanalysis of Light Elements 总被引：2，自引：0，他引：2
M. Darby Dyar Michael Wiedenbeck David Robertson Laura R. Cross Jeremy S. Delaney Kurt Ferguson Carl A. Francis Edward S. Grew Charles V. Guidotti Richard L. Hervig John M. Hughes John Husler William Leeman Anne V. McGuire Dieter Rhede Heike Rothe Rick L. Paul Ian Richards Martin Yates 《Geostandards and Geoanalytical Research》2001,25(2-3):441-463
The quantitative determination of light element concentrations in geological specimens represents a major analytical challenge as the electron probe is generally not suited to this task. With the development of new in situ analytical techniques, and in particular the increasing use of secondary ion mass spectrometry, the routine determination of Li, Be and B contents has become a realistic goal. However, a major obstacle to the development of this research field is the critical dependence of SIMS on the availability of well characterized, homogeneous reference materials that are closely matched in matrix (composition and structure) to the sample being studied. Here we report the first results from a suite of large, gem crystals which cover a broad spectrum of minerals in which light elements are major constituents. We have characterized these materials using both in situ and wet chemical techniques. The samples described here are intended for distribution to geochemical laboratories active in the study of light elements. Further work is needed before reference values for these materials can be finalized, but the availability of this suite of materials represents a major step toward the routine analysis of the light element contents of geological specimens. 相似文献
14.
测点相对位置对离子探针锆石U-Pb定年的影响 总被引：2，自引：1，他引：1
离子探针得益于高空间分辨率的特点,在复杂变质锆石的微区原位年代学研究中,其常被作为首选技术手段。对具有复杂环带结构的锆石进行原位分析,通常可以得到岩石多期次地质演化信息,因此在一颗有核(幔)边结构的锆石上进行多点分析是常见现象。为了定量地评估多点分析时测点的相对位置对离子探针测量结果的影响,本研究采用目前报道最为均一的锆石标样M257为测试对象,分为四种情况,即同一测点重复测试年龄、同一测点先氧同位素分析后年龄测试、在首个测点的上/下/左/右方且预剥蚀区域有部分重叠的范围内测试、距首个测点有显著距离测试等,进行了系统性U-Pb定年对比实验。结果显示,相对一个颗粒上的首个测点,第二个测点的测试深度和预剥蚀区域的变化会给测试结果带来-5%到+11%的系统偏差,尤以与首个测点的预剥蚀区域有重叠且位于一次离子入射方向后侧的分析点会产生最为显著的系统偏差。因此,在采用离子探针进行副矿物U-Pb测试的时候,当需要原位重复分析或在临近区域多点分析时,需要特别注意多个测点的相对位置和分析顺序。本实验结果指示,以往通过离子探针方法对变质锆石进行过核边多点分析,通过变质锆石边部所获得的年龄结果值得重新审视,有将变质时代持续时间扩大化的隐忧。 相似文献
15.
矿物包裹体的化学成分研究在地质学、矿床学和油气勘探等方面具有重要意义。目前对包裹体化学成分分析的主要分析方法有激光烧蚀电感耦合等离子体质谱(LA-ICP-MS)、电子探针(EPMA)、显微激光拉曼光谱(LRS)、傅里叶变换红外光谱(FTIR)、质子诱发X射线光谱分析(PIXE)、同步辐射X射线荧光光谱(SXRF)和(传统的)二次离子质谱分析(SIMS)等。本文在对上述方法的分析特点进行简单介绍的基础上,重点阐述了对于矿床学样品表征具有广泛应用潜力的飞行时间二次离子质谱(TOF-SIMS)的原理、特点和技术优势,总结了国内外学者应用TOF-SIMS对矿物包裹体化学成分分析的研究进展与存在问题,并做了相关领域的展望。 相似文献
16.
Thomas Pettke Werner E. Halter James D. Webster Mario Aigner-Torres Christoph A. Heinrich 《Lithos》2004,78(4):333-361
Laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) has recently emerged as a powerful in situ microanalytical technique for major to trace elements in heterogeneous samples such as fluid and melt inclusions. Here, a rigorous comparison of melt inclusion (MI) data acquired by electron microprobe (EMP), ion microprobe (the secondary ion mass spectrometry, SIMS) and LA-ICPMS is used to evaluate the applicability and advantages/drawbacks of these approaches. We are specifically interested in determining if LA-ICPMS data on entire, unexposed, crystallized MI that cannot be homogenized in the lab are accurate and of a useful precision.
Quantification of LA-ICPMS MI signals requires the use of an internal standard, i.e., the concentration of one element, or an element ratio, at the time of MI entrapment must be known independently, in order to derive the pure MI composition from the MI plus host mixed signal. Analysis of plagioclase-hosted glassy MI of a mid-ocean ridge basalt (MORB) sample from the East Pacific Rise illustrates that melt inclusion chemistry can be accurately quantified by LA-ICPMS, including the correction for postentrapment sidewall crystallisation of the host mineral without prior reheating in the lab.
The LA-ICPMS data obtained on crystallized MI demonstrate agreement with the EMP and SIMS data on exposed glassy MI at the 1 standard deviation uncertainty level except for a few elements close to their limits of detection. LA-ICPMS data reduction schemes include the quantification of analytical uncertainty on each element of single MI. Therefore, weighted average element concentrations can be obtained for MI assemblages, at precisions that compare well with those of average element concentrations obtained by EMP and SIMS.
Simple sample preparation minimizing inclusion loss through polishing combined with the analytical efficiency of 50 inclusions plus neighbouring host mineral at up to 40 elements per day enable the collection of statistically relevant datasets by LA-ICPMS. These allow to recognize nonrepresentative MI (e.g., heterogeneous entrapment). Application to individual clinopyroxene crystals from the AD79 pumice horizon of Mt. Somma-Vesuvius reveals chemical variability that exceeds the analytical precision on single melt inclusions. This variability was not obvious from the limited data set obtained by SIMS and EMP.
The largest source of nonquantifiable error for EMP and SIMS data stems from the requirement of reheating the melt inclusions in the lab in order to reverse postentrapment crystallisation onto inclusion walls or growth of crystallites. For LA-ICPMS analysis of unexposed MI, the reliability with which the internal standard (IS) element concentration is known determines the quality of the data. LA-ICPMS, however, cannot analyse H2O, F, S and Cl reliably, has higher limits of detection (LODs) than SIMS for some elements for MI below 25 μm, has lower spatial resolution than both EMP and SIMS and consumes much more sample per analysis. Therefore, EMP, SIMS and LA-ICPMS are complementary in MI research, and the type of application will determine the analytical method or methods of choice. 相似文献
17.
Haosheng Wu Roman Bttger Frdric Couffignal Jens Gutzmer Joachim Krause Frans Munnik Axel D. Renno Ren Hübner Michael Wiedenbeck Ren Ziegenrücker 《Geostandards and Geoanalytical Research》2019,43(4):531-541
Although electron probe microanalysis and secondary ion mass spectrometry are widely used analytical techniques for geochemical and mineralogical applications, metrologically rigorous quantification remains a major challenge for these methods. Secondary ion mass spectrometry (SIMS) in particular is a matrix‐sensitive method, and the use of matrix‐matched reference materials (RMs) is essential to avoid significant analytical bias. A major problem is that the number of available RMs for SIMS is extremely small compared with the needs of analysts. One approach for the production of matrix‐specific RMs is the use of high‐energy ion implantation that introduces a known amount of a selected isotope into a material. We chose the more elaborate way of implanting a so‐called ‘box‐profile’ to generate a quasi‐homogeneous concentration of the implanted isotope in three dimensions, which allows RMs not only to be used for ion beam analysis but also makes them suitable for EPMA. For proof of concept, we used the thoroughly studied mineralogically and chemically ‘simple’ SiO2 system. We implanted either 47Ti or 48Ti into synthetic, ultra‐high‐purity silica glass. Several ‘box‐profiles’ with mass fractions between 10 and 1000 μg g?1 Ti and maximum depths of homogeneous Ti distribution between 200 nm and 3 μm were produced at the Institute of Ion Beam Physics and Materials Research of Helmholtz‐Zentrum Dresden‐Rossendorf. Multiple implantation steps using varying ion energies and ion doses were simulated with Stopping and Range of Ions in Matter (SRIM) software, optimising for the target concentrations, implantation depths and technical limits of the implanter. We characterised several implant test samples having different concentrations and maximum implantation depths by means of SIMS and other analytical techniques. The results show that the implant samples are suitable for use as reference materials for SIMS measurements. The multi‐energy ion implantation technique also appears to be a promising procedure for the production of EPMA‐suitable reference materials. 相似文献
18.
U-Pb zircon geochronology is increasingly called upon to achieve the resolution of absolute time at the 0.1% to 1% level for rocks of Phanerozoic to Hadean age. Doing so requires accurate calibration of the several methods (conventional isotope dilution thermal ionization mass spectrometry [ID-TIMS], Pb evaporation, high-resolution ion microprobe [e.g. SHRIMP], and laser ablation inductively coupled plasma mass spectrometry [LA-ICPMS]) currently in use, in numerous laboratories, for the analysis of U and Pb isotopes in accessory minerals. Toward this end, the geochronological community would benefit from the establishment, distribution and widespread analysis of one or more standard reference materials. Among the candidates is natural zircon from the Duluth Complex anorthositic series of the Midcontinent Rift system of North America. These zircons, first dated by conventional ID-TIMS at 1099.1 ± 0.5 Ma, have been subsequently adopted as a geochronological standard by a number of high resolution ion microprobe facilities. A new and independent analysis of the systematics of a large set of single zircons (n = 27) from the same mineral separate yields indistinguishable 207Pb/206Pb, upper intercept, and U-Pb concordia dates for the AS3 zircons. The concordia date, based on a subset of 12 concordant and equivalent zircons, of 1099.1 ± 0.2 Ma (±1.2 Ma considering systematic uncertainties in Pb/U tracer calibration and U decay constants) is indistinguishable from previously published results. We further document the absence of inherited Pb in the AS3 zircons, and discuss strategies for avoiding certain domains within the AS3 zircons exhibiting small amounts of radiation-induced, surface and fracture-correlated, recent Pb loss. Although the AS3 zircons do not represent the ideal (and elusive) homogeneous closed U-Pb system, we conclude that these and similar zircons from the Duluth Complex anorthositic series can provide a suitable geochronological reference standard for numerous U-Pb zircon analytical methods, given appropriate preparation guided by the results of this study. Our high-precision data set also serves as a useful confirmatory test of the currently accepted U decay constants. 相似文献
19.
华南陆块早古生代的构造属性是华南地质研究争论的焦点,主要有洋-陆俯冲/碰撞和陆内构造两种观点之争.而华南陆块早古生代岩浆岩的报道以花岗质岩石为主,对构造指示意义更为明确的同期镁铁质岩浆岩则研究较少,且对已发现的少量早古生代镁铁质岩浆岩的岩石成因也颇具争议.为了更好地限定华南早古生代的构造属性,对云开地区新近识别出的池垌辉长岩体开展了详细的野外地质、年代学和地球化学研究.其SIMS锆石U-Pb年代学测试得到其206Pb/238U加权平均年龄为433.9±1.5 Ma,代表其结晶年龄.样品具较低的SiO2含量（47.81%~48.83%）,高的MgO含量（13.02%~14.65%）、Cr含量（278×10-6~356×10-6）和Ni含量（120×10-6~184×10-6）,富集大离子亲石元素、亏损高场强元素.（87Sr/86Sr）i=0.708 5~0.710 7,εNd（t）=-6.0~-8.2,显示EMⅡ型富集地幔的Sr-Nd同位素特征.结合区域Lu-Hf同位素、古生物、古水流等地质资料,云开地区志留纪时期发育一个受古老俯冲交代作用影响的地幔楔,该地幔楔源区在华南广西运动期间才受到热扰动而部分熔融.认为池垌辉长岩是在早古生代华南陆内造山后的伸展背景下由古老俯冲交代地幔楔熔融而成的产物. 相似文献
20.
Martin J. Whitehouse 《Geostandards and Geoanalytical Research》2013,37(1):19-33
High spatial resolution multiple sulfur isotope studies undertaken by multi‐collector secondary ion mass spectrometry (SIMS) commonly use well‐characterised sulfide reference materials that do not (or are assumed not to) exhibit mass‐independent fractionation in 33S and 36S, taking advantage of the three‐isotope plot to evaluate the extent of such fractionation in unknown targets. As a result, few studies to date have used a mass independently fractionated reference sulfide to demonstrate accuracy of measurement and/or data reduction procedures. This article evaluates two mass independently fractionated sulfides, a pyrite from the 3.7 Ga Isua greenstone belt and a pyrrhotite from a 2.7 Ga gold deposit in Minas Gerais, Brazil, which may be used to provide additional confidence in the obtained multiple sulfur isotope data. Additionally, the article presents a method for measuring quadruple sulfur isotopes by SIMS at a comparable spatial and volume resolution to that typically employed for triple sulfur isotopes. This method has been applied to the Isua pyrite as well as to a sample of 2.5 Ga pyrite from the Campbellrand, Transvaal, South Africa, previously investigated using SIMS for triple sulfur isotopes, illustrating its potential for quadruple sulfur investigations. 相似文献