A online science mall at sciencemall-usa.com is a geek gift store for the adult science enthusiast, science educator, and science researcher. Our mission is to provide science gifts, science educational products, meteorites, necklace, pendant, earrings, and fulgurite lightning sand jewelry. We also sell school geology rock and mineral specimens, rare mineral matrix specimens, pallasites, tektites, Libyan Desert Glass, fulgurite lightning sand, Lichtenberg figures, Titanic coal, school rock collections, manganese nodules, elements of the periodic table, fossils and legal historical artifacts. Rare earth rock specimens such as ancient life stromatolites (earth's earliest life), shatter cones, banded iron formation, Greenstone belt BIF banded iron formation, KT/boundary, K-Pg boundary, radioactive minerals, science art posters, prints, curio desk displays, science jewelry pendant necklace earrings, hand crafted artisan jewelry for KennedyCoJewelry, are also our specialty.

Acasta Gneiss Slave Lake Northwest Territories Canada

Acasta Gneiss Slave Lake NW Territories Canada
Acasta Gneiss Slave Lake NW Territories Canada
Item# JPT-17091
Regular price: $165.00
Sale price: $139.95
Availability: Usually ships the next business day

Product Description

Acasta Gneiss comes from the remote Northwest Territories of northern Canada. In the Slave Lake province, is one of the oldest and most unique known zircon-bearing evolved crustal outcrops on Earth. The Acasta gneiss rock outcrop complex was formed during the earliest time of our planet's history, the Hadean Eon. The name is taken from the nearest location, the Acasta River, which is east of Great Slave Lake - some good distance north of Yellowknife. The rock exposed at this outcrop formed some 3.58 - 4.2 billion years ago. It is an age based on radiometric dating of zircon crystals.

During the earliest part of the Hadean Eon the Earth’s surface was incredibly unstable. Deep convection currents in the Earth's mantle brought fiery, molten rocks to the surface and caused cooling rocks to descend into the magmatic seas. The heavier elements, like iron, descended to become the core and the lighter elements, such as silicon, became a part of the growing crust. Its unknown when the first outer crust of the planet formed, but it is thought that the existence of grains of zircon dated to about 4.4 billion years ago (Jack Hills Zircon) indicated the presence of liquid water and stable continents. The surface temperatures then were probably less than 212 °F.

Few rocks and minerals remain from the Hadean Eon because nearly all of this original crust has been subducted, either due to tectonic plate movements and other geological processes.

The oldest rocks known are the faux amphibolite volcanic deposits of the Nuvvuagittuq greenstone belt in Quebec, Canada which are estimated to be about 4.28 billion years old. The Jack Hills zircons, in Australia, are the oldest mineral grains so far found on Earth. They provide compelling evidence that have led scientists to believe that the atmosphere and oceans most likely formed before 4.4 billion years ago.

Size of Acasta Gneiss: 47mm H X 30mm W X 17mm D

Ships Certificate of Authenticity, tag, information and perky display box. Stands and cube not included.

FREE PRIORITY SHIPPING (2-3 days) IN THE USA!