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Featured researches published by Patrick J. Sack.


Geochemistry Geophysics Geosystems | 2011

In situ location and U‐Pb dating of small zircon grains in igneous rocks using laser ablation–inductively coupled plasma–quadrupole mass spectrometry

Patrick J. Sack; Rf Berry; S Meffre; Trevor J. Falloon; J. Bruce Gemmell; Richard M. Friedman

A new U‐Pb zircon dating protocol for small (10–50 mm) zircons has been developed using an automated searching method to locate zircon grains in a polished rock mount. The scanning electron microscopeenergy‐ dispersive X ray spectrum‐based automated searching method can routinely find in situ zircon grains larger than 5 mm across. A selection of these grains was ablated using a 10 mm laser spot and analyzed in an inductively coupled plasma‐quadrupole mass spectrometer (ICP‐QMS). The technique has lower precision (∼6% uncertainty at 95% confidence on individual spot analyses) than typical laser ablation ICP‐MS (∼2%), secondary ion mass spectrometry (<1%), and isotope dilution‐thermal ionization mass spectrometry (∼0.4%) methods. However, it is accurate and has been used successfully on fine‐grained lithologies, including mafic rocks from island arcs, ocean basins, and ophiolites, which have traditionally been considered devoid of dateable zircons. This technique is particularly well suited for medium‐ to fine‐grained mafic volcanic rocks where zircon separation is challenging and can also be used to date rocks where only small amounts of sample are available (clasts, xenoliths, dredge rocks). The most significant problem with dating small in situ zircon grains is Pb loss. In our study, many of the small zircons analyzed have high U contents, and the isotopic compositions of these grains are consistent with Pb loss resulting from internal a radiation damage. This problem is not significant in very young rocks and can be minimized in older rocks by avoiding high‐ U zircon grains.


Earth and Planetary Science Letters | 2014

Trace element content of sedimentary pyrite as a new proxy for deep-time ocean-atmosphere evolution

Rr Large; Ja Halpin; Leonid V. Danyushevsky; Valeriy V. Maslennikov; Sw Bull; John A. Long; D Gregory; E Lounejeva; Timothy W. Lyons; Patrick J. Sack; Pj McGoldrick; Clive R. Calver


Economic Geology | 2015

Trace Element Content of Sedimentary Pyrite in Black Shales

D Gregory; Rr Large; Ja Halpin; Elena Lounejeva Baturina; Timothy W. Lyons; Selina Wu; Leonid V. Danyushevsky; Patrick J. Sack; Anthony Chappaz; Valeriy V. Maslennikov; Sw Bull


Gondwana Research | 2015

Cycles of nutrient trace elements in the Phanerozoic ocean

Rr Large; Ja Halpin; E Lounejeva; Leonid V. Danyushevsky; Valeriy V. Maslennikov; D Gregory; Patrick J. Sack; Peter W. Haines; John A. Long; Charles Makoundi; Aleksandr S. Stepanov


Earth and Planetary Science Letters | 2015

Gold in the oceans through time

Rr Large; D Gregory; Ja Steadman; Andrew George Tomkins; E Lounejeva; Leonid V. Danyushevsky; Ja Halpin; Valeriy V. Maslennikov; Patrick J. Sack; Indrani Mukherjee; Rf Berry; Arthur H. Hickman


Mineralium Deposita | 2017

Secular distribution of highly metalliferous black shales corresponds with peaks in past atmosphere oxygenation

Sc Johnson; Rr Large; Raymond M. Coveney; Karen D. Kelley; John F. Slack; Ja Steadman; Daniel D. Gregory; Patrick J. Sack; S Meffre


Yukon Exploration and Geology | 2014

Sedimentary pyrite as a gold-source in sediment-hosted gold occurrences in the Selwyn basin area, eastern Yukon

Patrick J. Sack; Leonid V. Danyushevsky; Rr Large; Se Gilbert; D Gregory


Geochemistry Geophysics Geosystems | 2011

In situ location and U-Pb dating of small zircon grains in igneous rocks using laser ablation-inductively coupled plasma-quadrupole mass spectrometry: U-PB DATING OF SMALL ZIRCON GRAINS

Patrick J. Sack; Rf Berry; S Meffre; Trevor J. Falloon; J. Bruce Gemmell; Richard M. Friedman


Mineralium Deposita | 2018

Geochemistry of shale and sedimentary pyrite as a proxy for gold fertility in the Selwyn basin area, Yukon

Patrick J. Sack; Rr Large; Daniel D. Gregory


Archive | 2016

Volcanogenic massive sulphide and orogenic gold deposits of northern southeast Alaska

Patrick J. Sack; Susan M. Karl; Nathan Steeves; J. Bruce Gemmell

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Rr Large

University of Tasmania

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D Gregory

University of Tasmania

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Ja Halpin

University of Tasmania

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E Lounejeva

National Autonomous University of Mexico

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Rf Berry

University of Tasmania

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S Meffre

University of Tasmania

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Sw Bull

University of Tasmania

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