Quantifying the formation and evolution of the Archaean lithospheric mantle
The formation of the Archean lithosphere was a key event in Earth history, resulting in the construction of the first continents, or cratons. The lithosphere formed by extensive mantle melting, however, there are conflicting model...
ver más
¿Tienes un proyecto y buscas un partner? Gracias a nuestro motor inteligente podemos recomendarte los mejores socios y ponerte en contacto con ellos. Te lo explicamos en este video
Proyectos interesantes
CGL2011-26700
EVOLUCION DEL MANTO SUBCONTINENTAL LITOSFERICO EN EL NE DE E...
63K€
Cerrado
CGL2016-78796-C2-1-P
EVOLUCION GEOQUIMICA DEL MANTO DE ESPAÑA PENINSULAR DESDE EP...
77K€
Cerrado
ChroMCrust
The Chromite Record of Mafic Crustal Growth
1M€
Cerrado
CGL2012-31872
ROCAS CORTICALES DE ULTRA ALTA PRESION EN LA CORDILLERA BETI...
99K€
Cerrado
CGL2013-42349-P
PROCEDENCIA, FORMACION, MODIFICACION Y OCEANIZACION DEL MANT...
115K€
Cerrado
CGL2016-76439-P
GEOQUIMICA ISOTOPICA (SR, ND, O, H, PB, HE) Y GEOCRONOLOGIA...
97K€
Cerrado
Información proyecto LITHO3
Duración del proyecto: 62 meses
Fecha Inicio: 2022-06-16
Fecha Fin: 2027-08-31
Descripción del proyecto
The formation of the Archean lithosphere was a key event in Earth history, resulting in the construction of the first continents, or cratons. The lithosphere formed by extensive mantle melting, however, there are conflicting models for the environment in which melting took place. Efforts to understand the formation of the cratonic lithosphere are hampered by a lack of quantitative information on the depth of mantle melting and the original thickness of the Archean lithosphere. Exsolved orthopyroxenes within peridotite xenoliths and silicate inclusions in diamond hold the key to constraining these critical parameters. We will reconstruct the original compositions of an extensive collection of exsolved orthopyroxenes and use our recently published thermodynamic model to calculate their formation pressures and temperatures. This innovative approach will reveal the depth extent of Archean melting. We will provide the first constraints on the vertical extent of the lithosphere in the Archean using geothermal gradients calculated from dated diamond inclusions. To achieve this, we will perform cutting edge laser ablation U-Pb dating of garnet inclusions, this challenging application has yielded promising results for xenolithic garnet. Observations will be complemented by new experiments using fertile, depleted and silica-enriched compositions, coupled with with thermodynamic modelling, which will lead to a better understanding of phase relations during peridotite melting. The origin and significance of silica enrichment is poorly understood. We will conduct melt-rock reaction experiments to test the hypothesis that silica addition occurred via interaction with ascending komatiite melt. We will thus address several fundamental issues: the depth of Archean mantle melting; the origin of silica enrichment; and the link between cratonic peridotite and komatiite magma. LITHO3 will provide unprecedented insight into the formation and evolution of the cratonic lithosphere.