Earth's mysterious D' layer: A relic of ancient oceans and planetary collisions

Deep within Earth, there lies a mysterious layer called the D" layer. Located roughly 3,000 kilometers down, this zone sits just above the boundary between the planet's molten outer core and its solid mantle.

A new study led by Dr. Qingyang Hu and Dr. Jie Deng suggests the D" layer might have originated from Earth's earliest days. Their theory hinges on the Giant Impact hypothesis, which proposes a Mars-sized object slammed into the proto-Earth, creating a planet-wide magma ocean in the aftermath. They believe the D" layer may be a unique composition leftover from this colossal impact, potentially holding clues to Earth's formation.Dr.

The presence of this iron-rich peroxide phase would alter the mineral composition of the D" layer, deviating from our current understanding. According to the new model, minerals in D" would be dominated by a new assemblage: the iron-poor silicate, iron-rich peroxide, and iron-poor oxide., making it a potential candidate to explain the D" layer's unique geophysical features.

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