Výsledky vyhledávání - "N. R. Stephen"

Deformation Mechanisms in Orogenic Gold Systems During Aseismic Periods: Microstructural Evidence from the Central Victorian Gold Deposits, Southeast Australia

Autor: Andrew G. Tomkins, Christopher R. Voisey, Vladimir Luzin, N. R. Stephen, Nicholas J.R. Hunter, Christopher J.L. Wilson

Publikováno v: Economic Geology. 116:1849-1864

In many orogenic gold deposits, gold is located in quartz veins. Understanding vein development at the microstructural scale may therefore provide insights into processes influencing the distribution of gold, its morphology, and its relationship to f

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7504bbbeaf956bf3464d82331b238225
https://doi.org/10.5382/econgeo.4885

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Dating martian mafic crust; microstructurally constrained baddeleyite geochronology of enriched shergottites Northwest Africa (NWA) 7257, NWA 8679 and Zagami

Autor: James Darling, N. R. Stephen, Winfried H. Schwarz, L. G. Staddon, Kimberly T. Tait, Sheila Schuindt, J. Dunlop

Publikováno v: Geochimica et Cosmochimica Acta. 315:73-88

This work was supported by Science and Technology Facilities Council grant [ST/S000291/1] to JRD. Baddeleyite (monoclinic; m-ZrO2) is a widespread accessory phase within shergottites. However, the effects of shock loading on baddeleyite U-Pb isotopic

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b858c191a41a736348cfe7fd6b2413b6
https://doi.org/10.1016/j.gca.2021.09.034

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Constraints on the petrologic history of gabbroic shergottite Northwest Africa 6963 from pyroxene zoning profiles and electron backscattered diffraction

Autor: N. R. Stephen, Justin Filiberto, Samantha J. Hammond, Susanne P. Schwenzer, Andrea Wenzel

Publikováno v: Meteoritics & Planetary Science. 56:1744-1757

Northwest Africa 6963 (NWA 6963) is a coarse-grained, gabbroic Martian meteorite that further extends our Martian sample collection, both compositionally and texturally. Gabbroic shergottite NWA 6963 provides direct petrologic evidence of intrusive i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bf3b8426fdfc7f848dd5e0cc4de841c3
https://doi.org/10.1111/maps.13737

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A small S-MIF signal in Martian regolith pyrite: Implications for the atmosphere

Autor: Sophie E. Nutku, Andrew G. Tomkins, Heejin Jeon, Sarah L. Alkemade, N. R. Stephen, Melanie Finch

Publikováno v: Geochimica et Cosmochimica Acta. 290:59-75

The past Martian atmosphere is often compared to the Archean Earth’s as both were dominated by CO2-rich and O2-poor chemistries. Archean Earth rocks preserve mass-independently fractionated sulfur isotopes (S-MIF; non-zero Δ33S and Δ36S), origina

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ed10e8d28a300a707491e944480cfb73
https://doi.org/10.1016/j.gca.2020.07.022

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Combined microstructural analysis and in-situ U-Pb chronology of baddeleyite within shergottites Northwest Africa (NWA) 7257, NWA 8679 and Zagami

Autor: Sheila Schuindt, Winfried H. Schwarz, J. Dunlop, L. G. Staddon, K. T. Tait, N. R. Stephen, James Darling

Baddeleyite (monoclinic; m-ZrO2) is an important U-Pb chronometer within mafic lithologies from many planetary bodies. Recent in-situ U-Pb dating of micro-baddeleyite within shergottites has been key in confirming recent magmatic activity on Mars. Ho

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9eea6a11cfb12afc2cd27cd7f13eba85
https://doi.org/10.5194/egusphere-egu21-10792

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