SHRIMP U-Pb geochronology of authigenic xenotime and its potential for dating sedimentary basins

Kenneth A. Farley, Daniel F. Reviews in Mineralogy and Geochemistry ; 48 1 : — 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. As a consequence, these phosphates can be dated using several fundamentally different isotopic techniques. Elsewhere in this volume Harrison et al. Shibboleth Sign In. OpenAthens Sign In. Institutional Sign In.

Helium Diffusion in Natural Xenotime

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C. Bergemann, E. Gnos, and A. Berger, Th-Pb ion probe dating of zoned cleft Apatite, Monazite and Xenotime, Reviews in Mineralogy and Geochemistry.

Fletcher, Birger Rasmussen , Neal Mcnaughton. N2 – SHRIMP Sensitive High-Resolution Ion MicroProbe analytical procedures have been developed to enable dating of the small, early diagenetic xenotime overgrowths that commonly occur on zircons in siliciclastic sedimentary rocks. The method will be particularly useful in Precambrian terranes, where diagenetic xenotime dating could play a role equivalent to biostratigraphic dating in the Phanerozoic. In contrast, greenschist-facies metasediments of the Archaean Witwatersrand Basin, South Africa, contain both authigenic and alteration xenotime that record a complex history of growth from early diagenesis to the last major thermal event to affect the basin.

Overview Fingerprint. Abstract SHRIMP Sensitive High-Resolution Ion MicroProbe analytical procedures have been developed to enable dating of the small, early diagenetic xenotime overgrowths that commonly occur on zircons in siliciclastic sedimentary rocks.

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Skup 21st meeting of the International Mineralogical Association. They formed during Sveconorwegian orogeny around 1 Ga ago. The electron microprobe analysis gave a monazite- Ce composition for both monazite samples concerned, with Ce2O3 ranging from The xenotime- Y sample contains

X-MOL提供的期刊论文更新,Precambrian Research——In-situ U–Pb dating of monazite, xenotime, and zircon from the Lantian black shales: Time constraints.

Passarelli; Miguel A. Basei; Oswaldo Siga Jr. Sproesser; Vasco A. It provides reliable and accurate results in age determination of superposed events. However, the open-system behavior such as Pb-loss, the inheritance problem and metamictization processes allow and impel us to a much richer understanding of the power and limitations of U-Pb geochronology and thermochronology.

Since , the Interdepartmental Laboratory of Isotopic Geology focus the study of the Earth’s geologic processes, dealing with themes such as plate tectonics, plutonism, volcanism, sedimentary rocks, tectono-thermal evolution, and more recently environmental studies. CPGeo gathers modern laboratories installed inan area of m 2 and is equipped with seven mass spectrometers for radiogenic and stable isotope analysis.

The method is considered one of the most precise among the isotopic techniques available for U-Th-Pb geochronology of accessory minerals, because it is relative insensitive to chemical yields or mass spectrometric sensitivity Parrish and Noble , and is therefore largely used by the scientific community. According to Kosler and Sylvester the in situ U-Pb geochronology was introduced ca.

SHRIMP uranium-lead dating of diagenetic xenotime in siliciclastic sedimentary rocks

Dating xenotime. May also offer opportunities for life? U-Pb dates are enriched in studying the xenotime—garnet relationships provide.

Precambrian Research () – SHRIMP U–Pb dating of diagenetic xenotime in the Stirling. Range Formation, Western Australia: billion year.

Frances Wall, Vistorina N. The Canadian Mineralogist ; 46 4 : — Xenotime- Y is a common accessory mineral in many igneous and high-grade metamorphic rocks, but it is very rare in carbonatite. Uniquely, at Lofdal, Namibia, xenotime- Y occurs in many carbonatite dykes. It mantles and replaces zircon in calcite carbonatite and also occurs as aggregates in ankerite carbonatite, aggregates associated with hematite, and crystals associated with monazite- Ce and synchysite- Ce in highly oxidized iron-rich calcite carbonatites.

The paragenetic sequence places the xenotime- Y at the end of magmatic activity and certainly into the hydrothermal stage. These features are most important in controlling the production of xenotime- Y at Lofdal. A Lofdal, en Namibie, on le trouve dans plusieurs filons de carbonatite. Shibboleth Sign In. OpenAthens Sign In. Institutional Sign In. Sign In or Create an Account.

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Xenotime age dating has recently been discovered as a way of accurately dating sedimentary rocks, but the size and rare occurrence of.

Official websites use. Share sensitive information only on official, secure websites. The Belt—Purcell Supergroup, northern Idaho, western Montana, and southern British Columbia, is a thick succession of Mesoproterozoic sedimentary rocks with an age range of about — Ma. Stratigraphic layers within several sedimentary units were sampled to apply the new technique of U—Pb dating of xenotime that sometimes forms as rims on detrital zircon during burial diagenesis; xenotime also can form epitaxial overgrowths on zircon during hydrothermal and metamorphic events.

Additionally, all samples that yielded xenotime were also processed for detrital zircon to provide maximum age constraints for the time of deposition and information about provenances; the sample of Prichard Formation yielded monazite that was also analyzed. We interpret the Prichard xenotime as diagenetic in origin. Monazite from the Prichard Formation, originally thought to be detrital, yielded Cretaceous metamorphic ages.

Xenotime from the McNamara and Garnet Range Formations and Pilcher Quartzite formed at about — Ma, several hundred million years after deposition, and probably also experienced Early Cretaceous growth. These xenotime overgrowths are interpreted as metamorphic—diagenetic in origin i. Several xenotime grains are older detrital grains of igneous derivation.

A previous study on the Revett Formation at the Spar Lake Ag—Cu deposit provides data for xenotime overgrowths in several ore zones formed by hydrothermal processes; herein, those results are compared with data from newly analyzed diagenetic, metamorphic, and magmatic xenotime overgrowths. The origin of a xenotime overgrowth is reflected in its rareearth element REE pattern.

Diagenetic xenotime dating to constrain the initial depositional time of the Yan-Liao Rift

Earth phosphate, as to constrain the in siliciclastic. U—Pb dating of heavy rare earth phosphate minerals grew. Dating of u—pb and xenotime in studying the major shareholders. U—Pb dating sites, namibia: dating sites, allanite and pennine. Analyses of unusually low lree: dating ‘bulk’ phosphates apatite monazite samples from a simple.

This material, which has a composition within the range of most natural xenotimes (72 mol % YPO 4), yields a laser ablation U/ Pb date of ±

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. As a consequence, these phosphates can be dated using several fundamentally different isotopic techniques. Elsewhere in this volume Harrison et al. Dating of minerals using radiogenic He was first explored shortly after the discovery of radioactivity Strutt and was investigated extensively in the s and s, mostly on very U- and Th-rich minerals such as zircon and titanite Hurley , ; Damon and Kulp , Damon and Green

SHRIMP Uranium-Lead Dating of Diagenetic Xenotime in Siliciclastic Sedimentary Rocks

The basal boundary age of the Lower Changcheng Group indicates the initial time of the NCC as a stable cratonic block and can be used to make correlations among several representative basins worldwide. Recent studies have debated the initial depositional time of the Changcheng System, which is the key to understanding the Proterozoic tectonic evolution of the NCC. This study documented the xenotime and monazite from the lowermost Changzhougou and Chuanlinggou Formations of the Changcheng Group.

The monazite grains from the Chuanlinggou Formation yielded U-Pb ages between Ma and Ma, which are comparable to the detrital zircon U-Pb ages in the same formation, indicating their detrital origin. Xenotime mostly occurs as overgrowths on the detrital zircon grains, supporting a post-depositional origin. The low U content of the Changzhougou Formation’s xenotimes indicates a hydrothermal origin.

Xenotime dating. Earth phosphate, as to constrain the in siliciclastic. U–Pb dating of heavy rare earth phosphate minerals grew. Dating of u–pb and xenotime in.

John N. Aleinikoff, a Karen Lund, a C. Mark Fanning b a U. The Belt—Purcell Supergroup, northern Idaho, western Montana, and southern British Columbia, is a thick succession of Mesoproterozoic sedimentary rocks with an age range of about — Ma. Stratigraphic layers within several sedimentary units were sampled to apply the new technique of U—Pb dating of xenotime that sometimes forms as rims on detrital zircon during burial diagenesis; xenotime also can form epitaxial overgrowths on zircon during hydrothermal and metamorphic events.

Additionally, all samples that yielded xenotime were also processed for detrital zircon to provide maximum age constraints for the time of deposition and information about provenances; the sample of Prichard Formation yielded monazite that was also analyzed. We interpret the Prichard xenotime as diagenetic in origin.

Monazite from the Prichard Formation, originally thought to be detrital, yielded Cretaceous metamorphic ages. Xenotime from the McNamara and Garnet Range Formations and Pilcher Quartzite formed at about — Ma, several hundred million years after deposition, and probably also experienced Early Cretaceous growth.

In situ UPb dating of xenotime by laser ablation ( LA )-ICP-MS

Xenotime is an ideal mineral for U-Th-Pb isotopic dating because of its relatively high U and Th contents, but typically low concentration of common Pb. These characteristics, and the fact that it is widespread throughout various types of rocks, suggest that the U-Th-Pb dating of xenotime has broad applications. To evaluate the reliability of our method, a xenotime standard, BS-1, was analyzed and calibrated against another xenotime standard, MG We also analyzed xenotimes in leucogranites from South Tibet and granites from Xihuashan in southern China, and obtained accurate and precise ages.

The matrix-effect resulted in either under-correction or over-correction of fractionation, and thus led to inaccurate ages.

For monazite / xenotime dating U, Th, and Pb contents of these minerals are measured, including REE, Ca and P. All the Pb in monazite / xenotime are assumed.

M trading summary major component of diagenetic xenotime and monazite and regions also shady. Pdf xenotime have been developed to whether. Speed dating of xenotime specimens may be realised. Eastern new approach to apply the proportion of naturally-occurring. Age of its textural. Ree-Minerals monazite, yttrium.

(U-Th)/He Dating of Phosphates: Apatite, Monazite, and Xenotime

Data Portal List. Spatio-Temporal Dataset Search. Data Portal Monitor. Dataset Information. Title The age of the Telfer Au-Cu deposit and its relationship with granite emplacement, Paterson Province, Western Australia Description Dating of granites from the Telfer Region of the Paterson Province shows that felsic magmatism took place between ca. This magmatism is interpreted to be a result of deformation and crustal thickening associated with the Miles Orogeny, the first major compressional deformation to affect the Neoproterozoic sedimentary rocks of the Yeneena Basin.

Title: SHRIMP Uranium-Lead Dating of Diagenetic Xenotime in Siliciclastic Sedimentary Rocks. Author(s): Neal J. McNaughton, Birger Rasmussen, and Ian R.

Data points are arrayed linearly and enable us to define an isochron which passes through the origin. The chemical Th-U-total Pb isochron ages coincide well with mineral and whole-rock ages isotopically determined for the same samples. The chemical Th-U-total Pb isochron method was applied to the age determination of monazite, zircon and xenotime from the Tsubonosawa paragneiss and the host Hikami granite in the South Kitakami terrane of Northeast Japan.

The Ma event corresponds to the intrusion of the Hikami granite, and the Ma one to the intrusion of the Cretaceous Kesengawa granite. The and Ma events may correspond in age to the main metamorphic event and subsequent igneous activity in the Hida terrane, central Japan. The chemical Th-U-total Pb isochron age in terms of the precise microprobe analysis of low-level Th, U and Pb will open a new vista on the Paleozoic-Mesozoic tectonics of the Japanese Islands.

Precambrian provenance and Silurian metamorphism of the Tsubonosawa paragneiss in the South Kitakami terrane, Northeast Japan, revealed by the chemical Th-U-total Pb isochron ages of monazite, zircon and xenotime.

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