11 Result(s)

Article

Post-Archean Nb-REE-U enrichment in the Superior craton recorded in metasomatised mantle rocks erupted in the 1.1 Ga Midcontinental Rift event

Mantle xenoliths in a Mesoproterozoic lamprophyre dyke at Elliot Lake, Ontario, located on the east margin of the Midcontinent Rift (MCR), erupted at ~ 1.1 Ga. These xenoliths enable a study of critical metal ...

Hélène Legros, Janina Czas, Yan Luo, Sarah Woodland… in Mineralium Deposita (2024)

Article

Magmatic origin for the massive sulfide ores in the sedimentary country rocks of mafic–ultramafic intrusions in the Midcontinent Rift System

Some mafic–ultramafic intrusions in the North American Midcontinent Rift System host disseminated to massive sulfides of magmatic origin. Massive sulfides are also present in the immediate sedimentary country ...

Joshua M. Smith, Edward M. Ripley, Chusi Li, Steven B. Shirey… in Mineralium Deposita (2022)

Article

Reply to: Evidence for two blue (type IIb) diamond populations

Evan M. Smith, Steven B. Shirey, Stephen H. Richardson, Fabrizio Nestola… in Nature (2019)

Article

Blue boron-bearing diamonds from Earth’s lower mantle

Geological pathways for the recycling of Earth’s surface materials into the mantle are both driven and obscured by plate tectonics^1–3. Gauging the extent of this recycling is difficult because subducted crustal c...

Evan M. Smith, Steven B. Shirey, Stephen H. Richardson, Fabrizio Nestola… in Nature (2018)

Article

Formation of cratonic subcontinental lithospheric mantle and complementary komatiite from hybrid plume sources

Peridotitic sulphide inclusions in diamonds from the central Slave craton constrain the age and origin of their subcontinental lithospheric mantle (SCLM) sources. These sulphides align with either a ca. 3.5 Ga...

Sonja Aulbach, Thomas Stachel, Larry M. Heaman… in Contributions to Mineralogy and Petrology (2011)

Article

Diamond formation episodes at the southern margin of the Kaapvaal Craton: Re–Os systematics of sulfide inclusions from the Jagersfontein Mine

Sulfide inclusions in diamonds from the 90-Ma Jagersfontein kimberlite, intruded into the southern margin of the Kaapvaal Craton, were analyzed for their Re–Os isotope systematics to constrain the ages and pet...

Sonja Aulbach, Steven B. Shirey… in Contributions to Mineralogy and Petrology (2009)

Article

Isotopic and trace element constraints on the petrogenesis of lavas from the Mount Adams volcanic field, Washington

Strontium, Nd, Pb, Hf, Os, and O isotope compositions for 30 Quaternary lava flows from the Mount Adams stratovolcano and its basaltic periphery in the Cascade arc, southern Washington, USA indicate a major co...

Brian R. Jicha, Garret L. Hart… in Contributions to Mineralogy and Petrology (2009)

Article

Continental mantle signature of Bushveld magmas and coeval diamonds

Over two billion years ago, the Bushveld Complex, the world's largest layered intrusion and platinum group element repository, was emplaced within the Kaapvaal craton of southern Africa, one of Earth's earlies...

Stephen H. Richardson, Steven B. Shirey in Nature (2008)

Article

Three-component isotopic heterogeneity near the Oceanographer transform, Mid-Atlantic Ridge

Tholeiitic basalts collected over an area of less than 100 km² near the Oceanographer transform fault have isotopic compositions interpreted as mixing between three chemically distinct mantle sources. Of the two ...

Steven B. Shirey, John F. Bender, Charles H. Langmuir in Nature (1987)

Article

Mantle-derived Archaean monozodiorites and trachyandesites

The 2,680–2,750-Myr old^1–5 intrusive granite–greenstone terranes^6–8 in the Rainy Lake region, Ontario, and in, and adjacent to, the Vermilion District, Minnesota, of the Superior Province in North America, includ...

Steven B. Shirey, Gilbert N. Hanson in Nature (1984)