Category archives for: Geology

Submerged continent found in the Indian ocean

lostcontinent

Scientists have discovered a submerged continent in the Indian ocean, between Madagascar and India. According to sediments found on the coast of Mauritius, at some point during the last 2 billion and 600 million years ago, there was an archipelago that separated from Madagascar and the Indian sub-continent. They then got submerged during the tectonic [...]

Partly molten, Florida-sized blob forms atop Earth’s core

This map shows Earth’s surface superimposed on a depiction of what a new University of Utah study indicates is happening 1,800 miles deep at the boundary between Earth’s warm, rocky mantle and its liquid outer core. Using seismic waves the probe Earth’s deep interior, seismologist Michael Thorne found evidence that two continent-sized piles of rock are colliding as they move atop the core. The merger process isn’t yet complete, so there is a depression or hole between the merging piles. But in that hole, a Florida-sized blob of partly molten rock -- called a “mega ultra low velocity zone” -- is forming from the collision of smaller blobs on the edges of the continent-sized piles. Thorne believe this process is the beginning stage of massive volcanic eruptions that won’t occur for another 100 million to 2100 million years - Credit: Michael S. Thorne, University of Utah

A University of Utah seismologist analyzed seismic waves that bombarded Earth’s core, and believes he got a look at the earliest roots of Earth’s most cataclysmic kind of volcanic eruption. But don’t worry. He says it won’t happen for perhaps 200 million years. “What we may be detecting is the start of one of these [...]

New evidence argues against prehistoric extraterrestrial impact event

Sediments spanning the Younger Dryas boundary in Arizons. The 'black mat" is the dark horizon at mid-height - Credit: Web

Evidence used to support a possible extraterrestrial impact event is likely the result of natural processes, according to a new collaborative study led by U.S. Geological Survey scientists. Elevated levels of iridium, magnetic spherules, and titanomagnetite grains, collectively called “impact markers,” form the bulk of the evidence for the Younger Dryas impact hypothesis, a hotly [...]

Iceland ‘Gateway to Hell’ Volcano to Erupt Again, Experts Say

One of Iceland’s most feared volcanoes, Hekla, looks ready to erupt, with measurement instruments showing likely magma movement, an Icelandic geophysicist said Wednesday. The volcano is close to the ash-spewing Eyjafjoell, which last year caused the world’s biggest airspace shut down since World War II, affecting more than 100,000 flights and eight million passengers. The [...]

Creationism creeps into mainstream geology

It was easy to miss the part where the field trip leader said the outcrop formed during Noah’s Flood. After all, “During these catastrophic flood flows, turbulent, hyperconcentrated suspensions were observed to transform laminar mudflows” sounds like a reasonable description of alluvial fan processes. And “massive marine transgression” sounds scientific enough. But when creationist geologists [...]

Water in Earth’s mantle key to survival of oldest continents

Earth today is one of the most active planets in the Solar System, and was probably even more so during the early stages of its life. Thanks to the plate tectonics that continue to shape our planet’s surface, remnants of crust from Earth’s formative years are rare, but not impossible to find. A paper published [...]

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