一层厚厚的地壳可能盖住了萨摩亚火山柱,抑制了火山活动3000万年,这就解释了萨摩亚火山链上一个奇怪的裂缝。
plate tectonics
Compositional Anomalies Complicate Our Model of Mantle Convection
A new study expands on recent research which suggests that oceanic crust accumulates in the mid-mantle. The new seismological constraints advance our understanding of thermo-chemical planetary evolution.
Elementary, My Dear: Al & Be Give Evidence of Past Climate Change
10Be and 26Al concentrations in river sand reveal an increase in erosion rate in the Brazilian Highlands consistent with the Mid-Pleistocene Transition, a major climatic shift that occurred about 1 million years ago.
A New View of Deep Earth’s Carbon Emissions
Advances in plate tectonics research allow a deeper understanding of how greenhouse gases escape from within the planet.
How Does Subsurface Lithology Speak to Hillslope Morphology?
Subsurface flow hydrology connects soils and bedrock lithology to long-term catchment evolution in humid landscapes.
Structural Inversion of an Intracratonic Rift System in Deep Time
A new study reconstructs how an ancient North American rift system was uplifted in space and time due to subsequent continent-continent collision.
Nevada Has Loads of Lithium. Here’s Why.
Nevada is becoming a major producer of lithium, thanks to topography, climate, and geologic serendipity.
Tracking a Disappearing Mantle Plume in Ancient Samoa
A thick portion of Earth’s crust may have capped the Samoan plume and suppressed volcanism for 30 million years, explaining a curious gap along the Samoan chain.
A Close Asteroid Encounter May Have Once Given Earth a Ring
An unusual concentration of impact craters suggests that they may have been caused by the breakup of an asteroid that created a temporary debris ring around Earth.
Seismotectonic Update of the Philippines-Taiwan Region
Using more than two decades of data, scientists find that the Philippine and Taiwan subduction region is controlled mainly by shallow seismicity and low magnitude earthquakes.