Monazite geochronology (EPMA)

Farley, Kenneth A. Reviews in Mineralogy and Geochemistry. ISBN Full text is not posted in this repository. Consult Related URLs below. For example, apatite usually has a few tens of ppm of both U and Th, while monazite and xenotime usually have hundreds of ppm to weight percent levels of these elements.

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Keywords: Monazite; Garnet; (U,Th)/Pb dating; Himalaya; Microcrack; Retrograde metamorphism. 1. Introduction. Over the past ten years, Th/Pb dating of.

Dating xenotime. May also offer opportunities for life? U-Pb dates are enriched in studying the xenotime—garnet relationships provide. Apr 25, andhra pradesh. Precambrian research — Nov 8, in carbonatite dykes at least when you. Age for u-th-pb method for precipitation. U-Pb geochronology of 16 ma 2s for lofdal and th—pb dating techniques could be applied to date consistent with published dates.

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Finally, the Amherst team investigated in detail the technical issues of electron microprobe monazite dating. They showed that the best analytical.

The sample, an osumilite-bearing ultra-high-temperature granulite from Rogaland, Norway, is characterized by complexly patchy zoned monazite crystals. Three chemical domains are distinguished as 1 a sulphate-rich core 0. This study illustrates that it is possible to discriminate different generations of monazite based on their S contents. From the petrological context, we propose that sulphate-rich monazite reflects high-temperature Fe—sulphide breakdown under oxidizing conditions, coeval with biotite dehydration melting.

Monazite may therefore reveal the presence of S in anatectic melts from high-grade terrains at a specific point in time and date S mobilization from a reduced to an oxidized state. This property can be used to investigate the mineralization potential of a given geological event within a larger orogenic framework. This is a preview of subscription content, log in to check access. Rent this article via DeepDyve.

Electron Microprobe Dating of Monazite

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Ghats Belt, India): Part 2. LA-ICP-MS zircon dating and texturally controlled in-​situ monazite dating. Precambrian Research, –

Milton, J. Include files Advanced Search Browse. View item. Genre : Journal Article. Files show Files. Locators show. Content show hide Free keywords : -. Abstract : The km-long Redstone copper belt in the Mackenzie Mountains, Northwest Territories, Canada, is composed of a series of sediment-hosted stratiform copper SSC deposits hosted in Neoproterozoic fault-bounded intracontinental rift basins.

Sulphate incorporation in monazite lattice and dating the cycle of sulphur in metamorphic belts

Hacker, M. Racek, R. Holder, A. Kylander-Clark, K. Schulmann, P.

In contrast, our ± Ma monazite date for Rushan suggests a discrete gold event occurred about 5 m.y. later than the deposits to the.

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Coupling of in-situ Sm-Nd systematics and U-Pb dating of monazite and allanite

Petrology and Geodynamics. Neoproterozoic reworking of the Ubendian Belt crust: Implication for an orogenic cycle between the Tanzania Craton and Bangweulu Block during the assembly of Gondwana. Precambrian Research. Available online 6 December Journal of African Earth Sciences,

Coupling of in-situ Sm-Nd systematics and U-Pb dating of monazite and allanite. Chris McFarlane, Malcolm McCulloch, & Courtney Gregory.

Polygenetic monazite grains in diverse Precambrian crystalline rocks from the Black Hills, South Dakota, have been analyzed in situ by ion and electron microprobe methods SHRIMP and EMP , to evaluate the accuracy and precision of EMP ages determined using a new analytical protocol that incorporates improved background acquisition and interference corrections. The monazite data set includes EMP chemical analyses from 26 grains in six metamorphic rocks, which resolve into 54 age-composition domains, and 31 SHRIMP isotopic ages from 13 grains in one of the rocks, with six grains microanalyzed in common by the two methods.

The data set also includes monazite-bearing garnets in two of the rocks, whose isotopic compositions were analyzed using Pb stepwise-leaching PbSL methods. The EMP data set is interpreted geologically as reflecting multiple episodes of monazite growth that are provisionally related to known metamorphic events in the Black Hills.

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Monazite geochronology

The Granulite Terrane of southern India GTSI is believed to be a microcontinental block which was bounded to the west by Madagascar and East African and to the east by Sri Lanka and Antarctica before it collided with the Indian subcontinent during the amalgamation of Gondwana. The Terrane is divided into different crustal units based on the difference in their evolution history: 1 Salem Block 2 Madurai Block 3 Trivandrum Block 4 Nagercoil Block Santosh et al.

However interpretations from different studies are very controversial based on PCSS being the suture zone.

In geochronological applications, it can be used to date the crystallization of igneous rocks, determine the age of metamorphism in metamorphic rocks of variable.

Symposium on Geol. Resources of Madagascar – A good example of the usefulness of the in-situ dating method. Madagascar displays a huge portion of the lower crust and its study is fundamental for the understanding of the evolution of this part of the crust. Unfortunately, our knowledge of this domain is limited. At this time, numerous works structural, geochemical, petrological are in progress in Madagascar, but there are only a few geochronological data. In this context, the fast, non-expensive, reliable electron microprobe monazite dating method, using the Th-U-Pb system, is particularly efficient to obtain many ages see Montel et al.

We applied this method in Madagascar. In the granulitic basement Southern Madagascar, three large areas can be distinguished, from East to West : the Androyan, the Bekily and the Vohibory blocks, separated by transcurrent shear zones : the Bongolava-Ranotsara, the Beraketa and the Ampanihy shear zones. This geometry is interpreted as the result of crustal extrusion towards the S-SE of the South of the island during the Mozambican collision.

grinding sand density data


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