Saturday, July 4, 2020
Continents

Continents

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Isobath map of the eastern Alborán basin with the volcanic edifice location. Orange lines show the main flood paths. (Image: García-Castellanos et al, 2020, Earth-Sciences Reviews)
Continents

New pieces of evidence found in the Alborán Sea possibly related...

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Credit: University of St Andrews
Continents

Hidden past of Earth’s oldest continents unearthed

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Satellite image of the Gibraltar Arc. Credit: NASA
Continents

Lithospheric thickening beneath the Betics and Rif mountains pulls down the...

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A schematic summary of the effect of the convergence rate. Upper image shows a slow convergence rate allows thermal difussion and a derived reduction of slab's density (positive buoyancy). Lower image shows how a faster convergence rate increases the slab's density promoting the negative buoyancy. Credit: Kittiphon Boonma, Scientific Reports
Continents

Study explores the density of the tectonic plates and why they...

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The deep structure of the continent Antarctica. Credit: Planetary Visions (credit: ESA/Planetary Visions)
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The Antarctic: Data about the structure of the icy continent

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Reconstructed paleo-elevation in southwestern North America at the Late Eocene (36 million years ago). Credit: Bahadori and Holt
Continents

New geologic modeling method explains collapse of ancient mountains in American...

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Earth
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Telescopes and satellites combine to map entire planet’s ground movement

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Images of the numerical solution at the moment when a supercontinent (left, in purplish grey) begins to break up. In the image on the left, the modelled fictional planet looks much like the Earth: its surface and mantle move spontaneously, at speeds close to those observed on Earth. The distribution of the plates (some of which are large, while many are small) is also similar, as is the topography: red hues represent shallow regions of the ocean (ridges), while blue indicates the deep seafloor. The deepest blue areas correspond to subduction trenches (where a plate is sinking into the mantle). The continents are shown in translucent white (and therefore appear purplish grey).The image on the right shows warm currents (plumes) rising from the bottom of the mantle. Credit: Nicolas Coltice
Continents

What makes the Earth’s surface move?

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A detail of the southern wall of the Las Cañadas caldera de . It is the best exposed sector of this volcanic structure. (Imagen: Joan Martí)
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Study provides new insight into the origin of Las Cañadas caldera...

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Fig. 1 Map of the 2016 Kaikōura earthquake and surrounding area. (A) Transpressional tectonic setting of the northeastern South Island of New Zealand. (B) Map of surface ruptures from the 2016 Mw 7.8 Kaikōura earthquake, shown in bold black lines with the Papatea fault in red (8, 28). Dots represent scaled relative energy release from back-projection results (15) and are colored by time since rupture onset. Mapped active faults that did not rupture during the Kaikōura event are indicated by thin black lines (28). Credit: Science Advances 02 Oct 2019: Vol. 5, no. 10, eaax5703, DOI: 10.1126/sciadv.aax5703
Continents

Unusual fault rupture during Kaikōura quake

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Photographs of alkaline magmatic intrusions in Greenland. The region was volcanically and tectonically active around 1.2 billion years ago. Although no longer active, it is of major interest to geologists because the subsequent uplift and glacial erosion have cut deep into the rift and exposed the magma chambers that once lay well below the surface. Greenland’s magmas were sourced from a mantle that was enriched and contaminated by ancient crustal materials. Credit: University of St Andrews
Continents

Ancient volcanoes reveal Earth’s recycled crust

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Continents breaking up and getting back together. Image credit: Naeblys / Getty Images
Continents

Researchers uncover 2.5 billion years of Earth’s continents breaking up and...

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India , Asia
Continents

When India Slammed Into Asia

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Explosive volcanic crater (maar) with small lake at the bottom close to Dilo
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New light into the recent evolution of the African rift valley

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The central Andes Mountains and surrounding landscape, as seen in this true-color image from NASA’s Terra spacecraft, formed over the past 170 million years as the Nazca Plate lying under the Pacific Ocean has forced its way under the South American Plate. Credit: NASA
Continents

Earth’s continental nurseries discovered beneath mountains

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Earth
Continents

Scientists propose solution to ‘Gaia puzzle’

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Nuvvuagittuq, Canada
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Earth could have supported continental crust, life earlier than thought

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Cifelliodon wahkarmoosuch
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Utah fossil reveals global exodus of mammals’ near relatives to major...

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continents
Continents

Formation of supercontinents and strength of ocean tides

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Cratonic lithosphere with a high-density root undergoes delamination when perturbed by mantle plumes from beneath. The removed cratonic root then thermally grows back, with its rock fabrics preserving recent mantle deformation.
Continents

Continental interiors may not be as tectonically stable as geologists think

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