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16.Atlas of Zircon Textures | Igneous Rock | Rock (Geology)

John de Laeter Centre for Mass Spectrometry, Curtin University of Technology, Perth, Australia a number of accessory minerals have also been utilized for age-dating purposes including xenotime,

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Minerals Sands | Geoscience Australia

New xenotime ages are obtained from the Paleoproterozoic King Leopold Sandstone of the Kimberley Group, NW Australia. The concordant age of 1679 ± 13 Ma can be equated with the ca 1.7 Ga xenotime age within errors obtained from the Warton and Pentecost Sandstones of the same group.

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Zirconolite and xenotime U–Pb age constraints on the

A biography of the Australian continent. . The Australian Environment. The Australian continent 6 . Australia is an extensive, low continent with an area of about 7.66 million km 2, and a mean height above the present sea level of 330 m, and 200 km 2 less than 200 m above sea level. The highest point on the continent is Mt Kosciuszko that rises to 2,227 m, not an impressive height on a world

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Metamorphic Processes and Seismicity: the Bergen Arcs as a

In Situ U–Pb Monazite and Xenotime Geochronology of the Abra Polymetallic Deposit and Associated Sedimentary and Volcanic Rocks, Bangemall Supergroup, Western Australia SHRIMP dating of hydrothermal monazite from the Abra deposit suggests that a mineralization event occurred at c. 1385 Ma. Perth: Geological Survey of Western Australia

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Imogen O.H. Fielding | Geological Survey of Western

首页 > 期刊首页 >地质学报(英文版) >2015年1期 > In-Situ SHRIMP U-Pb Dating of Xenotime Outgrowth on Detrital Zircon Grains from the Changzhougou Formation of the Ming Tomb District, Beijing

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In-Situ SHRIMP U-Pb Dating of Xenotime

Abstract. In situ U-Pb dating of monazite and xenotime in gold reefs and unmineralized greenschist facies sedimentary rocks from the Witwatersrand basin, South Africa, reveals two episodes of tectonothermal activity.

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Zircons from Syros, Cyclades, Greece—Recrystallization and

Conclusions Improved calibration procedures and new standards for U–Pb and Th–Pb dating of Phanerozoic xenotime by ion microprobe. Chem. Geol. 209, The 1.15 Ga position of the Amazon craton indicated by the 295–314.

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Uranium-Lead, Chemical Isochron U-Pb Method (CHIME)

12/18/2012 · The company reported that the deposit is an alluvial outwash which comprises an Indicated Resource of 387 Mt containing 27 000 tonnes of xenotime, 161 000 tonnes of monazite and 196 000 tonnes of zircon. The xenotime and monazite were stated to contain about 14 000 tonnes of total REOs.

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Australian Geology - austhrutime.com

XENOTIME GEOCHRONOLOGY OF THE ABRA POLYMETALLIC DEPOSIT AND Perth WA 6845 2 Centre for Microscopy, Characterisation and Analysis, SHRIMP dating of hydrothermal monazite from the Abra deposit suggests that a mineralization event occurred at c. 1385 Ma. The presence

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Silcrete | David Nash - Academia.edu

Rasmussen (2005) has suggested xenotime dating of diagenetic overgrowths within sediments. If the diagenesis begins soon after deposition, the resulting dates can closely approximate the age the sedimentary unit was formed, but it is difficult to test this assumption, and to date the method has been most useful in Archean and Proterozoic

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New xenotime ages obtained from the Paleoproterozoic

Australian Journal of Earth Sciences - tandfonline.com

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Palaeomagnetism of red beds from the Kimberley Group

relevant for the monazite data. For the data in Table 1 and for xenotime A-1 (and to a lesser extent xenotime A-2) a greater problem is likely to be mineral inclusions within the analysis area. These samples have few, if any, areas of sufficient area which are completely free of visible inclusions.

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Birger Rasmussen | University of Western Australia, Perth

Electron microprobe dating of thorite inclusions in zircon II yielded a Th–U-total Pb model age of 122 ± 5(2r) Ma, supporting the age relationship between Technology, GPO Box U1987, Perth, WA 6845, Australia 123 Contrib Mineral Petrol (2010) 160:909–930 DOI 10.1007/s00410-010-0514-2. xenotime-(Y), as well as zircon

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Steve Sheppard - Senior Project Geologist - Calidus

xenotime, which can incorporate U and Th on the order of several weight percent, typically retain *Email: [email protected] Encyclopedia of Scientific Dating Methods DOI 10.1007/978-94-007-6326-5_200-1 # Springer Science+Business Media Dordrecht 2014 Page 1 of 9

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SHRIMP U–Pb dating of diagenetic xenotime in the Stirling

U-(Th)-Pb dating of monazite and xenotime by EPMA, LA-ICPMS, and IDTIMS: examples from Yilgarn Craton and Himalayas. 15th Annual Goldschmidt Conference Abstracts, p. A19. First citation in article

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Geochemical reconstruction of the provenance, weathering

Sapphirine granulites of the Gruf Complex (Central Alps, N-Italy): in-situ monazite dating by SHRIMP and confocal synchrotron-XRF. Journal Article Goldschmidt Conference Abstracts 2008., 2008 .

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Oncolliga | Employees dating customers

Perth WA 6845, Australia INTRODUCTION (2000) SHRIMP U-Pb geochronology of authigenic xenotime and its potential for dating sedimentary basins. Austral J Earth Sci 47:845-859 Fowler A, Prokoph A, Stern R, Dupuis C (2002) Organization of oscillatory zoning in zircon: Analysis, scaling,

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Exhumation and relief development in the Pelvoux and Dora

[17] Selected samples from the Pelvoux transect were prepared for AHe analysis at the John de Laeter Center for Isotope Research, Perth, Australia. Apatite grains were handpicked and evaluated under a binocular microscope, with any grains displaying fluid or crystalline inclusions rejected from analysis.

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A history of mass spectrometry in Australia - Downard

The in situ secondary ion mass spectrometry dating of monazite and xenotime employed here will lead to better targeting of orogenic gold deposits in the northern Capricorn Orogen, and these

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GSA News Releases - Contact

Birger Rasmussen of University of Western Australia, Perth (UWA) with expertise in: Geology, Geomicrobiology and Geochemistry. Uranium–lead dating of xenotime from the ores using the

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Publications – Geochron Research Group

Multiple grains of monazite were identified in thin section, but only grains that could be texturally and compositionally linked to synkinematic and/or synmetamorphic growth during S 1 or S 2 strain were selected for dating (e.g., Figures 14 15–16 and Table 2).

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2001106 Rasmussen 1 - Geological Society of America

McNally, G.H. & Wilson, I.RE. (1995) Silcretes of the Mirackina Palaeochannel, Arckaringa, South Australia. Australian Geological Survey Organisation Journal of Australian Geology and Geophysics 16, 295–301. McNaughton, N.J., Rasmussen B. & Fletcher I.R. (1999) SHRIMP uranium-lead dating of diagenetic xenotime in siliciclastic sedimentary rocks.

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A Permian Layered Intrusive Complex in the Western Tarim

SHRIMP U–Pb dating of diagenetic xenotime in the Stirling Range Formation, Western Australia: 1.8 billion year minimum age for the Stirling biota Perth.Porter and Knoll, 2000. S Porter, A.H KnollTestate amoebae in the Neoproterozoic Era: evidence from vase-shaped microfossils in the Chuar Group, Grand Canyon. Paleobiology, 26 (2000), pp

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Mineral Sands | Geoscience Australia

Geoscience Australia's history, dating from 1946. Visiting Geoscience Australia. Also present are minor amounts of xenotime (Y(PO 4)) Astron Ltd, 2012. Donald mineral sands project – review of uranium/thorium wash process and proved ore reserve update. Australian Securities Exchange release 18 June 2012. 4pp.

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Bushveld-aged fluid flow, peak metamorphism, and gold

View Galvin Dawson’s profile on LinkedIn, the world's largest professional community. 234 Lord St Perth WA 6000. SHRIMP U Pb dating of early diagenetic xenotime establishes a Late Palaeoproterozoic (1696±7 Ma) depositional age for the Mount Barren Group, thereby negating a Mesoproterozoic synorogenic origin. SHRIMP U Pb detrital

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AES MDSG Abstracts | Geology | Rock (Geology)

The younger age of xenotime growth at ca. 1655 Ma, obtained from multiple grains, is attributed to a second, discrete hydrothermal event, probably dating emplacement of the ankerite-quartz veins, and is within uncertainty of xenotime rims in the auriferous quartz-sulfide vein (GSWA 209907).

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Galvin Dawson - Director/Finance Broker - Finance Edge

The Paleoproterozoic megascopic Stirling biota. CLOSE Stefan Bengtson SHRIMP U-Pb dating of diagenetic xenotime in the Stirling Range Formation, Western Australia: 1.8 billion year minimum age for the Stirling biota. Taphonomy and paleobiology. More. Most Cited Articles .

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Direct dating of paleomagnetic results from Precambrian

The Institute for Geoscience Research (TIGeR), Curtin University, Perth, WA 6845, AustraliaInstitut für Mineralogie, University of Münster, Münster, 48149, Germany Corresponding author. Telephone: +61 0466 339 443. Fax: +61 8 9266 3153. Dating by isotope dilution thermal ionization mass spectrometry (ID-TIMS) defined a discordia with an

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Tectonic evolution of the Tasman Fold Belt System in NE

Ion microprobe analyses for U, Th and Pb isotopes were obtained using the SHRIMP II at Curtin University of Technology, Perth. Spot sizes ranged between 20 and 30 µm, and the target areas were rastered before analysis. xenotime, and Y–heavy REE (HREE)–Th silicate phases. Type 2 zircon crystals are observed in all lithologies.

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Direct dating of paleomagnetic results from Precambrian

Whales in the Desert Plus more Geology articles published online ahead of print in August. Boulder, Colo., USA - In Cerro Colorado, located in the Ica Desert of Peru, sedimentary sequences dating back nine million years have been found to host the fossil skeletons of hundreds of marine vertebrates. Nanoscale deformation twinning in xenotime

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Radiometric dating of sedimentary rocks: the application

AES MDSG Abstracts. For Later. save. Related. Info. Department of Mineralogy. 0?35 g t–1 Au). Previous K–Ar dating of the ore-related porphyry intrusive and the mineralisation has returned ages in the range of 310 to 290 Ma.. Ghent. with REE-rich carbonates and phosphates. West Perth. F. Two types of uranium mineralisation are

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Australian Journal of Earth Sciences - tandfonline.com

The oldest rock in the world is the Acasta Gneiss in northern Canada dating from approximately 4 Gya (Bowring & Housh 1995). Chemical Weathering, Atmospheric CO2, and Climate Lee R. Kump 1 Susan L. Brantley 1 and Michael A. Arthur 1

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The Paleoproterozoic megascopic Stirling biota | Paleobiology

sedimentary rocks, and our U-Pb zircon dating gives a crystallization age of Ma. Rock types of the BLIC274 2 include pyroxenite, diorite, syenite, and quartz syenite, with a wide range of SiO

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In Situ U–Pb Monazite and Xenotime Geochronology of the

Abstract We apply a new diagenetic dating technique to determine the age of magnetization for Precambrian sedimentary rocks in the SW Amazon craton. Two new paleomagnetic poles are reported from the rocks of the Aguapeí Gp.: red beds of the Fortuna Fm.

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Neoarchean Greenstone Metamorphism in the Eastern Dharwar

Radiometric dating of sedimentary rocks: the application of diagenetic xenotime geochronology. Author links open overlay panel Birger Rasmussen. Show more. Ion microprobe dating indicates that the xenotime precipitated during at least three temporally distinct periods. Palaeoproterozoic Mount Barren Group, Western Australia.

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Alteration of crystalline zircon solid solutions: a case

Keywords Zirconolite Xenotime U–Pb dating SHRIMP Gold mineralization Yilgarn craton Introduction Perth, WA 6845, Australia e-mail: [email protected] A. G. Mueller 12a Belgrave Street, Maylands, WA 6051, Australia 123 Contrib Mineral Petrol …

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DATES AND RATES: Temporal Resolution in the Deep Time

Perth, Australia. Planning, directing and coordinating all regional exploration activities on Calidus and JV partners' exploration tenements on the Warrawoona project, Marble Bar region. The in situ secondary ion mass spectrometry dating of monazite and xenotime employed here will lead to better targeting of orogenic gold deposits in the