Patrick J. Sack
University of Tasmania
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Featured researches published by Patrick J. Sack.
Geochemistry Geophysics Geosystems | 2011
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
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
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
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
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
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
Patrick J. Sack; Leonid V. Danyushevsky; Rr Large; Se Gilbert; D Gregory
Geochemistry Geophysics Geosystems | 2011
Patrick J. Sack; Rf Berry; S Meffre; Trevor J. Falloon; J. Bruce Gemmell; Richard M. Friedman
Mineralium Deposita | 2018
Patrick J. Sack; Rr Large; Daniel D. Gregory
Archive | 2016
Patrick J. Sack; Susan M. Karl; Nathan Steeves; J. Bruce Gemmell