First in situ Re-Os dating of molybdenite by LA-ICP-MS/MS

Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: Conventional dating of molybdenite ReOs provides one of few options for direct dating of sulfide mineralization. Unfortunately, in situ dating of molybdenite is considered unreliable due to intra-granular decoupling of ReOs. In this study, we developed a new analytical protocol for studies of micron- to grain scale ReOs systematics in molybdenite. View on Springer.

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DOI: ; |; Published online: In this paper, U-Pb LA-ICP-MS dating of apatite was applied to seven different.

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide. Zircon Pb—U dating has become a key technique for answering many important questions in geosciences. Samples younger than 1 Ma were corrected for initial thorium disequilibrium using a new formula that also accounts for disequilibrium in Th decay. This article is licensed under a Creative Commons Attribution 3. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material.


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The data used to support the findings of this study are available from the corresponding author upon request. Furthermore, the effects of spot size and plasma condition on the precision, accuracy, and uncertainty strongly depended on the sensitivity of analytes. Fine elemental and isotopic composition information of minerals at microscale are beneficial to decode the crystallization environment, the experienced geochemical process, and the history of geological body evolution.

Due to the advantages of minimal sample preparation, high throughput, high spatial resolution, and small sample requirements, LA-ICP-MS has become the preferred technology for the microscale analysis in solid samples, such as mineral zonation dating and elemental and isotopic mapping [ 1 — 4 ].

Online chemical separation using ICP-MS/MS technology enables in situ dating by β-decay systems (e.g., Rb-Sr and K-Ca in micas) using laser.

Conventional dating of molybdenite Re- Os provides one of few options for direct dating of sulfide mineralization. Unfortunately, in situ dating of molybdenite is considered unreliable due to intra-granular decoupling of Re- Os. In this study, we developed a new analytical protocol for studies of micron- to grain scale Re- Os systematics in molybdenite. Several reaction gases were evaluated, and production of OsCH 2 by reaction with CH 4 was found to produce strong separation of Os from Re.

However, in contrast to the e. A mathematical correction of this remaining interference is possible, and Re- Os mass-shifted can be measured accurately even for fairly extreme ratios. For laser ablation, standards were developed by pressing particulate pellets of conventionally dated molybdenite Moly Hill and Merlin , because there are no appropriate reference materials available. Two important implications of this result are that decoupling Re-Os is not universal, and that our new analytical protocol is useful both for dating and for studies of decoupling.

However, dating of molybdenite is hindered by several analytical complications and is only performed in highly specialized labs. The main problem is that the mass difference between Re and Os cannot be resolved by mass spectrometry, and chemical separation of these isotopes is comparatively difficult. Additionally, decoupling of Re and Os within molybdenite crystals has been reported, especially in older and coarser grains, which means that extra care has been urged in sample preparation Selby and Creaser ; Stein et al.

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CHEMALE JR, Farid et al. U-Pb zircon in situ dating with LA-MC-ICP-MS using a mixed detector configuration. An. Acad. Bras. Ciênc. [online]. , vol, n

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