Výsledky vyhledávání - "Courtney J. Gregory"

SHRIMP U–Pb phosphate dating shows metamorphism was synchronous with magmatism during the Paleoproterozoic Capricorn Orogeny

Autor: Birger Rasmussen, Stephen Sheppard, Courtney J. Gregory, Agnieszka M. Piechocka, Jian-Wei Zi

Publikováno v: Australian Journal of Earth Sciences. 66:973-990

Unlike many Phanerozoic orogens, where the primary effects of orogenic events can be easily determined, Precambrian orogens are commonly characterised by repeated tectonothermal events maki...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::397322dae88d23385d039c3062e6eb1f
https://doi.org/10.1080/08120099.2019.1587644

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Using monazite geochronology to test the plume model for carbonatites: The example of Gifford Creek Carbonatite Complex, Australia

Autor: Jian-Wei Zi, Stephen Sheppard, Courtney J. Gregory, Birger Rasmussen, Janet R. Muhling

Publikováno v: Chemical Geology. 463:50-60

Carbonatites are carbonate-dominated igneous rocks derived by low-degree partial melting of metasomatized mantle, although the geodynamic processes responsible for their emplacement into the crust are disputed. Current models favor either reactivatio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::928977c06a6740f8af45f69fad0acf01
https://doi.org/10.1016/j.chemgeo.2017.05.007

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Monazite trumps zircon: applying SHRIMP U–Pb geochronology to systematically evaluate emplacement ages of leucocratic, low-temperature granites in a complex Precambrian orogen

Autor: Michael T.D. Wingate, Courtney J. Gregory, Jian-Wei Zi, Agnieszka M. Piechocka, Stephen Sheppard, Birger Rasmussen

Publikováno v: Contributions to Mineralogy and Petrology. 172

Although zircon is the most widely used geochronometer to determine the crystallisation ages of granites, it can be unreliable for low-temperature melts because they may not crystallise new zircon. For leucocratic granites U–Pb zircon dates, theref

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7d866e45ef9825c20e381b0172b7de67
https://doi.org/10.1007/s00410-017-1386-5

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SHRIMP zircon and titanite U-Pb ages, Lu-Hf isotope signatures and geochemical constraints for ∼2.56Ga granitic magmatism in Western Dharwar Craton, Southern India: Evidence for short-lived Neoarchean episodic crustal growth?

Autor: Simon A. Wilde, Neal J. McNaughton, Md. Alam Siddiqui, Bryan Krapez, M. Ram Mohan, Sandra L. Kamo, Courtney J. Gregory, Birger Rasmussen, Ian R. Fletcher, D. Srinivasa Sarma

Publikováno v: Precambrian Research. 243:197-220

SHRIMP U-Pb zircon and titanite age data for granites adjacent to the Gadag greenstone belt (GGB) in the Western Dharwar Craton (WDC), India, establish the occurrence of voluminous ∼2.56 Ga granitic magmatism and indicate the development and evolut

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::da54c40f8ee9959ee4a8d6165d475538
https://doi.org/10.1016/j.precamres.2013.12.017

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The Mangaroon Orogeny: Synchronous c. 1.7 Ga magmatism and low-P, high-T metamorphism in the West Australian Craton

Autor: Agnieszka M. Piechocka, Birger Rasmussen, Jian-Wei Zi, Courtney J. Gregory, Stephen Sheppard, Fawna J. Korhonen, Tim E. Johnson, Ian C.W. Fitzsimons

Publikováno v: Precambrian Research. 333:105425

The Capricorn Orogen records nearly one billion years of intraplate orogenesis within the West Australian Craton, although the processes responsible for this protracted, punctuated reworking remain unclear. Of the major tectonic events that affected

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8f8a1b9cf1a265c076be62c377d42acf
https://doi.org/10.1016/j.precamres.2019.105425

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Re-Os DATING OF MOLYBDENITE WITHIN HEMATITE BRECCIAS FROM THE VULCAN Cu-Au PROSPECT, OLYMPIC Cu-Au PROVINCE, SOUTH AUSTRALIA

Autor: Robert N. Smith, Timothy R. Baker, Roger G. Skirrow, David Selby, E. A. Jagodzinski, Anthony Reid, Courtney J. Gregory

Publikováno v: Economic Geology. 108:883-894

The Vulcan prospect is a newly discovered Cu-Au prospect located within the eastern Gawler craton, South Australia. The prospect is entirely subsurface and defined by a geophysical anomaly intersected by diamond drilling. Eight drill holes have all i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::df451f0e3ae68edf19909a30b7e16003
https://doi.org/10.2113/econgeo.108.4.883

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Tranquillityite: The last lunar mineral comes down to Earth

Autor: Alexandra Suvorova, Birger Rasmussen, Courtney J. Gregory, Ian R. Fletcher, Janet R. Muhling

Publikováno v: Geology. 40:83-86

Tranquillityite [Fe 2+ 8 (ZrY) 2 Ti 3 Si 3 O 24 ] was first discovered in mare basalts collected during the Apollo 11 lunar mission to the Sea of Tranquillity. The mineral has since been found exclusively in returned lunar samples and lunar meteorite

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3a08d84d2c82de4e36d7ab7665c5455e
https://doi.org/10.1130/g32525.1

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Metamorphic replacement of mineral inclusions in detrital zircon from Jack Hills, Australia: Implications for the Hadean Earth

Autor: Janet R. Muhling, Simon A. Wilde, Courtney J. Gregory, Birger Rasmussen, Ian R. Fletcher

Publikováno v: Geology. 39:1143-1146

The Hadean (before 4.0 Ga) crust has long been considered to comprise mainly primitive mafic and ultramafic rocks. However, mineral inclusions in detrital zircons as old as 4.4 Ga from Jack Hills, Australia, have been interpreted to be magmatic and t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::526c56d4ed312dfba9183ff7ec53c70f
https://doi.org/10.1130/g32554.1

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