Výsledky vyhledávání - "Gregory J. Walsh"

Akademický článek

Photoluminescence Imaging of Whole Zircon Grains on a Petrographic Microscope—An Underused Aide for Geochronologic Studies

Autor: Ryan J. McAleer, Aaron M. Jubb, Paul C. Hackley, Gregory J. Walsh, Arthur J. Merschat, Sean P. Regan, William C. Burton, Jorge A. Vazquez

Publikováno v: Minerals, Vol 10, Iss 10, p 876 (2020)

The refractory nature of zircon to temperature and pressure allows even a single zircon grain to preserve a rich history of magmatic, metamorphic, and hydrothermal processes. Isotopic dating of micro-domains exposed in cross-sections of zircon grains

Externí odkaz: https://doaj.org/article/f85dcfd33eb64068bf2a5cf8f4e64446

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Age and tectonic setting of the Quinebaug-Marlboro belt and implications for the history of Ganderian crustal fragments in southeastern New England, USA

Autor: Robert A. Ayuso, Gregory J. Walsh, R.P. Wintsch, John N. Aleinikoff

Publikováno v: Geosphere. 17:1038-1100

Crustal fragments underlain by high-grade rocks represent a challenge to plate reconstructions, and integrated mapping, geochronology, and geochemistry enable the unravelling of the temporal and spatial history of exotic crustal blocks. The Quinebaug

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a2dbf74a40120e4e1b5775631338e0b4
https://doi.org/10.1130/ges02295.1

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Unmixing multiple metamorphic muscovite age populations with powder X-ray diffraction and 40Ar/39Ar analysis

Autor: Peter M. Valley, Michael J. Kunk, R.P. Wintsch, Gregory J. Walsh, David L. Bish, Ryan J. McAleer

Publikováno v: American Journal of Science. 321:332-364

A combination of modal estimates from powder X-ray diffraction (XRD) experiments and argon isotopic data shows that muscovite 40Ar/39Ar total gas age correlates with muscovite composition near the retrograde Bald Mountain shear zone (BMSZ) in Claremo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ba09a3c1b59fecae17953f4b7347706d
https://doi.org/10.2475/03.2021.02

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Integrated geophysical imaging of rare earth element-bearing iron oxide-apatite deposits in the Eastern Adirondack Highlands, New York

Autor: Gregory J. Walsh, Jeffrey D. Phillips, Ryan D. Taylor, Anjana K. Shah

Publikováno v: GEOPHYSICS. 86:B37-B54

The eastern Adirondack Highlands of northern New York host dozens of iron oxide-apatite (IOA) deposits containing magnetite and rare earth element (REE)-bearing apatite. We use new aeromagnetic, aeroradiometric, ground gravity, and sample petrophysic

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e7566bfc55392e3a000d20e7fb053dc9
https://doi.org/10.1190/geo2019-0783.1

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Geochronology of the Oliverian Plutonic Suite and the Ammonoosuc Volcanics in the Bronson Hill arc: Western New Hampshire, USA

Autor: Ryan J. McAleer, Peter M. Valley, Gregory J. Walsh, Arthur J. Merschat

Publikováno v: Geosphere. 16:229-257

U-Pb zircon geochronology by sensitive high-resolution ion microprobe–reverse geometry (SHRIMP-RG) on 11 plutonic rocks and two volcanic rocks from the Bronson Hill arc in western New Hampshire yielded Early to Late Ordovician ages ranging from 475

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c710a523733223a358ccacaa2066f46e
https://doi.org/10.1130/ges02170.1

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