The Eoarchean (IPA: / ˌiːoʊ.ɑːrˈkiːən / EE-oh-ar-KEE-ən; also spelled Eoarchaean) is the first era of the Archean Eon of the geologic record. It spans 431 million years, from the end of the …

The Archean Eon (IPA: / ɑːrˈkiːən / ar-KEE-ən, also spelled Archaean or Archæan), in older sources sometimes called the Archaeozoic, is the second of the four geologic eons of Earth 's …

Eoarchean geology is the study of the oldest preserved crustal fragments of Earth during the Eoarchean era from 4.031 to 3.6 billion years ago.

Jan 16, 2014 · In the geologic record the Eoarchean (/ˌiːoʊ.ɑrˈkiːən/; also spelled Eoarchaean) Era or erathem is the earliest time following the solidification of Earth’s crust. It follows the …

Dec 1, 2021 · Greenland’s Eoarchean mafic rocks formed by fluid-fluxing of depleted upper mantle. Formation of Greenland’s Eoarchean crust matches convergent plate boundary …

Eoarchean [3.6 to 4.0 billion years ago (Ga)] tonalite-trondhjemite-granodiorite (TTG) is the major component of Earth’s oldest remnant continental crust, thereby holding the key to …

Apr 1, 2012 · We compare water-absent partial melting of two hydrated starting compositions, a modern mid-oceanic-ridge basalt (MORB) and a typical Eoarchean arc tholeiite from the Isua …

Although there is current evidence that rocks and minerals existed during the Hadean Eon, the Archean has a much more robust rock and fossil record. Figure 8.4.1 8.4. 1: Artist’s …

The Eoarchaean (Eoarchean) is the first geological era in the Archaean eon that began 4 billion years ago, and ended 3.6 billion years ago. [1] . Before it was the Hadean It is followed by the …

Jan 20, 2025 · Archean Eon, the earlier of the two formal divisions of Precambrian time (about 4.6 billion to 541 million years ago) and the period when life first formed on Earth.