- 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...
-
Hadean eon was
succeeded by the
Archean eon, with the Late
Heavy Bombardment hypothesized to have
occurred at the Hadean-
Archean boundary.
Hadean rocks are...
-
Archean subduction is a
contentious topic involving the
possible existence and
nature of
subduction in the
Archean, a
geologic eon
extending from 4.0-2...
- 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...
- an
informal unit of
geologic time,
subdivided into
three eons (Hadean,
Archean, Proterozoic) of the
geologic time scale. It
spans from the
formation of...
- A
shield is a
large area of
exposed Precambrian crystalline igneous and high-grade
metamorphic rocks that form
tectonically stable areas.
These rocks are...
- MEE-zoh-ar-KEE-ən, MEZ-oh-, also
spelled Mesoarchaean) is a
geologic era in the
Archean Eon,
spanning 3,200 to 2,800
million years ago,
which contains the first...
- the Wi****ersrand basin,
which is a 5–7 km (3.1–4.3 mi)
thick layer of
archean rocks located, in most places, deep
under the Free State,
Gauteng and surrounding...
- Post
Archean (after 2.5 Ga) TTG
rocks are
present in arc-related batholiths, as well as in
ophiolites (although of a
small proportion),
while Archean TTG...
- the
longest eon of Earth's
geologic time scale. It is
preceded by the
Archean and
followed by the Phanerozoic, and is the most
recent part of the Precambrian...
