Výsledky vyhledávání - "D A, Pearson"

Akademický článek

Exploring emerald global geochemical provenance through fingerprinting and machine learning methods

Autor: Raquel Alonso-Perez, James M.D. Day, D. Graham Pearson, Yan Luo, Manuel A. Palacios, Raju Sudhakar, Aaron Palke

Publikováno v: Artificial Intelligence in Geosciences, Vol 5, Iss , Pp 100085- (2024)

Emeralds – the green colored variety of beryl – occur as gem-quality specimens in over fifty deposits globally. While digital traceability methods for emerald have limitations, sample-based approaches offer robust alternatives, particularly for d

Externí odkaz: https://doaj.org/article/024b17f7846d46cdada392bc2030ed6f

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Akademický článek

Recently Identified Mesoproterozoic Strata in South‐Central Idaho Document Late‐Stage Rifting of the Nuna Supercontinent in Western Laurentia

Autor: J. P. Lever, K. E. Sundell, D. M. Pearson, D.T. Brennan

Publikováno v: Geochemistry, Geophysics, Geosystems, Vol 25, Iss 6, Pp n/a-n/a (2024)

Abstract Sedimentary basins are valuable archives of tectonic processes involved in continental rifting. The northern Rocky Mountains preserve the Belt Supergroup, one of the most complete records of Mesoproterozoic strata on Earth; however, debate r

Externí odkaz: https://doaj.org/article/98c7cbc9127a42eb8bd258fe96eda5ac

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Akademický článek

Widespread PREMA in the upper mantle indicated by low-degree basaltic melts

Autor: Ronghua Cai, Jingao Liu, D. Graham Pearson, Andrea Giuliani, Peter E. van Keken, Senan Oesch

Publikováno v: Nature Communications, Vol 14, Iss 1, Pp 1-10 (2023)

Abstract Studies of ocean island basalts have identified a Prevalent Mantle (PREMA) component as a fundamental feature of mantle geochemical arrays; however, its origin and distribution are highly controversial, including its potential link to plumes

Externí odkaz: https://doaj.org/article/ebb8c2bae22d43a39121d316df89496f

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Akademický článek

Diamond preservation in the lithospheric mantle recorded by olivine in kimberlites

Autor: Andrea Giuliani, David Phillips, D. Graham Pearson, Soumendu Sarkar, Alex A. Müller, Yaakov Weiss, Robin Preston, Michael Seller, Zdislav Spetsius

Publikováno v: Nature Communications, Vol 14, Iss 1, Pp 1-9 (2023)

Abstract The diamond potential of kimberlites is difficult to assess due to several mantle and magmatic processes affecting diamond content. Traditionally, initial evaluations are based on the compositions of mantle-derived minerals (garnet, chromite

Externí odkaz: https://doaj.org/article/bfc246b103e34ec5aede8a978c3259fa

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Akademický článek

Fingerprinting the Cretaceous-Paleogene boundary impact with Zn isotopes

Autor: Ryan Mathur, Brandon Mahan, Marissa Spencer, Linda Godfrey, Neil Landman, Matthew Garb, D. Graham Pearson, Sheng-Ao Liu, Francisca E. Oboh-Ikuenobe

Publikováno v: Nature Communications, Vol 12, Iss 1, Pp 1-8 (2021)

Elevated Zn isotope compositions occur in K-Pg sedimentary layers of three different depositional environments across North America and the Caribbean. The data indicate a volatilization event, and act as a robust mechanistic indicator of the meteorit

Externí odkaz: https://doaj.org/article/2e27242bfcc946d7a4e77849a224aa54

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Akademický článek

Oxidation state and metasomatism of the lithospheric mantle beneath the Rae Craton, Canada: strong gradients reflect craton formation and evolution

Autor: Alan B. Woodland, Carolin Gräf, Theresa Sandner, Heidi E. Höfer, Hans-Michael Seitz, D. Graham Pearson, Bruce A. Kjarsgaard

Publikováno v: Scientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)

Abstract We present the first oxidation state measurements for the subcontinental lithospheric mantle (SCLM) beneath the Rae craton, northern Canada, one of the largest components of the Canadian shield. In combination with major and trace element co

Externí odkaz: https://doaj.org/article/d960856c06f44c0d882b3b0cebd60d69

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Akademický článek

Heat Generation in Cratonic Mantle Roots—New Trace Element Constraints From Mantle Xenoliths and Implications for Cratonic Geotherms

Autor: T. McIntyre, K. Kublik, C. Currie, D. G. Pearson

Publikováno v: Geochemistry, Geophysics, Geosystems, Vol 22, Iss 9, Pp n/a-n/a (2021)

Abstract Heat generation within the cratonic lithospheric mantle (CLM) is an important but poorly determined parameter for constructing cratonic geotherms. Direct measurement of heat producing element (HPE: K, U, and Th) concentrations in bulk‐rock

Externí odkaz: https://doaj.org/article/87b3bc26320b4e5eb6a4afea827b3280

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Akademický článek

Slab Transport of Fluids to Deep Focus Earthquake Depths—Thermal Modeling Constraints and Evidence From Diamonds

Autor: Steven B. Shirey, Lara S. Wagner, Michael J. Walter, D. Graham Pearson, Peter E. van Keken

Publikováno v: AGU Advances, Vol 2, Iss 2, Pp n/a-n/a (2021)

Abstract The nature and cause of deep earthquakes remain enduring unknowns in the field of seismology. We present new models of thermal structures of subducted slabs traced to mantle transition zone depths that permit a detailed comparison between sl

Externí odkaz: https://doaj.org/article/7aa8c27a00a54916856eb6fad0945097

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