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all geography including DSDP/ODP Sites and Legs
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Africa
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Central Africa
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Central African Republic (1)
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East Africa
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Eritrea (1)
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Kenya
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East Turkana Basin (1)
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Uganda (1)
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East African Rift (1)
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North Africa
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Atlas Mountains
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Egypt
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Fayum Egypt (1)
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Morocco
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Southern Africa
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South Africa
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Limpopo South Africa (1)
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Merensky Reef (1)
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Western Cape Province South Africa (1)
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West Africa
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Antarctica
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Iberian Peninsula
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Spain
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Italy
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Great Sumatran Fault (2)
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Indian Ocean
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Oceania
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Ocean Drilling Program
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
computed tomography data
The use of X-ray micro-computed tomography to visualize and quantify lithium-bearing silicate minerals in pegmatites: Examples from the Tanco Pegmatite, Manitoba, Canada Available to Purchase
Nanoscale Insights into Weathering of Ti-Bearing Minerals and Heterogeneous Crystal Growth Mechanisms of Ti nano minerals in Altered Volcanic Ash Available to Purchase
Shape and Size Distribution of Sulfide Globules in the Raglan Magmatic Sulfide Deposit: Implications for Deposition and Exploration of Massive Sulfide Orebodies Available to Purchase
ADVANCING INDIVIDUAL FORAMINIFERA ANALYSIS BY COMBINING MOLECULAR, MORPHOMETRIC, AND TRACE ELEMENT GEOCHEMISTRY Open Access
First application of scintillator-based photon-counting computed tomography to rock samples: Preliminary results and prospects Available to Purchase
Development of fluid pathways and associated diagenetic variations in a natural CO 2 leaking fault zone. Open Access
A new biomechanical approach to cranial suture function: the role of contact elements in linear and nonlinear models Open Access
Endocranial morphology of three early-diverging ceratopsians and implications for the behavior and the evolution of the endocast in ceratopsians Available to Purchase
Turbidite correlation for paleoseismology Open Access
Propagating image-based rock classes from cored to non-cored depth intervals using supervised machine learning Available to Purchase
Investigating the causes of permeability anisotropy in heterogeneous conglomeratic sandstone using multiscale digital rock Available to Purchase
Multi-scale and multi-modal imaging study of mantle xenoliths and petrological implications Available to Purchase
Experimental and theoretical analysis of finely bedded porous rock models with internal cracks Available to Purchase
Understanding the effects of permafrost degradation through a multiphysics approach Available to Purchase
Reassessing the diversity, affinity, and construction of terminal Ediacaran tubiform fossils from the La Ciénega Formation, Sonora, Mexico Free
Analysis of physical and mechanical properties of granite under different cooling methods under high-temperatures thermal cycles Available to Purchase
Discovery of modern living intertidal stromatolites on Sheybarah Island, Red Sea, Saudi Arabia Open Access
HYBRID NATURE OF A NEW JURASSIC–CRETACEOUS WORM BURROW INDICATED BY MICROBIAL MEDIATION OF ITS WALL FORMATION Available to Purchase
Stochastic Reconstruction of 3D Heterogeneous Microstructure Using a Column-Oriented Multiple-Point Statistics Program Open Access
The spectrum of geochemical compositions of Oceanic Island Basalts (OIBs) and their systematic differences from Mid-Ocean Ridge Basalts (MORBs) reveal that the Earth’s mantle is chemically and isotopically heterogeneous. Two main processes, both related to plate tectonics, contribute to the creation of mantle heterogeneities: (1) partial melting generates melts enriched in incompatible elements and leaves a depleted residual rock; and (2) subduction of the oceanic lithosphere injects heterogeneous material at depth, in particular, altered oceanic crust and continental/oceanic sediments. Moreover, delamination and foundering of metasomatized subcontinental lithospheric mantle might have been important in the early Earth history, when plate tectonics did not operate as today. The fate of the subducted plate is still a matter of debate; presumably some of it is stirred by convection and some may segregate at the base of the mantle, in particular the oceanic crust, which is compositionally denser than the pyrolitic mantle. The view of the lower mantle as a “graveyard” of subducted crust prevailed for decades and was supported by the Hofmann and White ( 1982 ) observation that the geochemical fingerprint of most OIB reveals the presence of ancient recycled crust. However, recent geochemical data on short-lived systems ( e.g. 182 Hf→ 182 W has a half-life of 8.9 My) showed that some hotspots, namely Hawaii, Samoa, Iceland and Galápagos, have a negative µ 182 W anomaly. This discovery prompted a change in our view of the deep mantle because anomalies in short-lived systems require additional processes, which include, but are not limited to, the preservation of ‘pockets’ of melt from a primordial magma ocean, and/or chemical reactions between the metallic core and the silicate mantle. Exchanges at the core-mantle boundary would cause a negative µ 182 W anomaly, and might also add 3 He to mantle material later entrained by plumes. It is now clear that some plumes probe the deepest mantle and are highly heterogeneous, as revealed by isotope ratios from long-lived radiogenic systems, noble gases and short-lived isotope systems. Here I will focus on the dynamics of plumes carrying compositional and rheological heterogeneities. This contribution attempts to be pedagogic and multi-disciplinary, spanning from seismology to geochemistry and geodynamics.