Archean


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Related to Archean: archaean, Proterozoic

Archean

[är′kē·ən]
(geology)
A term, meaning ancient, which has been applied to the oldest rocks of the Precambrian; as more physical measurements of geologic time are made, the usage is changing; the term Early Precambrian is preferred.
References in periodicals archive ?
Archean seeks to partner with managers across a broad range of strategies including buyout, turnaround/restructuring, growth, credit opportunities, and real estate.
Burgess said that if the greenhouse gas composition of the atmosphere was comparable to current levels then the Earth should have been permanently glaciated but geological evidence suggests there were no global glaciations before the end of the Archean and that liquid water was widespread.
Given the Hadean's sparse geologic record, climate scientists tend to focus on ways to explain the paradox during the better understood Archean.
As per this deal, the shareholders of the company received one share of Archean Star for every four shares of Kent Exploration owned on January 28, 2011.
Aluminium fluoride when produced in Bahrain will give much needed support to the aluminium smelting industry which is flourishing in the GCC countries, said Archean chief financial officer S M Sundaram.
Komatiites were first identified by Viljoen and Viljoen (1969) in the Archean greenstone belt in the Barberton Mountainland of South Africa as a distinctive and "new" class of magnesium-rich (20-30 wt% MgO) volcanic rocks.
Current results from the Hattu belt and analogous, geochemical anomaly zones and gold discoveries, recently identified through out the 150-km-long Kuhmo-Suomussalmi belt, demonstrate that Archean greenstone belts in the Fennoscandian Shield are not devoid of gold, as previously thought, but, actually appear to have good potential for mineable deposits.
Archean outcrops in western Australia and in Zimbabwe show altered rocks interleaved with more pristine rocks.
BANKING AND CREDIT NEWS-July 5, 2011--Bank facilities of Archean Granites get lower rating from CARE(C)2011 M2 COMMUNICATIONS http://www.
This northeastern part of the Superior Province, with good exploration potential for gold, base metals and diamond deposits, represents the largest under-explored frontier region of exposed Archean crust in the Canadian Shield.
The Trans-Hudson orogen is a major Early Proterozoic suture between the Archean Rae-Hearne and Superior cratons of the western Churchill Province.