The Isua Greenstone Belt is an Archean greenstone belt in southwestern Greenland, aged between 3.7 and 3.8 billion years. [2] The belt contains variably metamorphosed mafic volcanic and sedimentary rocks, and is the largest exposure …

2024年9月24日 · The Isua Greenstone Belt is an Archean greenstone belt in southwestern Greenland. The belt is aged between 3.7 and 3.8 billion years. The belt contains variably metamorphosed mafic volcanic and sedimentary rocks.

An Archean greenstone belt in southwestern Greenland, aged between 3.7 and 3.8 billion years. The belt contains variably metamorphosed mafic volcanic and sedimentary rocks, and is the largest exposure of Eoarchaean supracrustal rocks on Earth. The belt is 35 km (22 mi) long.

2024年4月15日 · The Isua Supercrustal Belt in Greenland hosts sedimentary rocks that were deposited 3.7 billion years ago in the forearc environment of an active convergent plate boundary, suggesting...

2022年9月1日 · In the early 1970s, Vic McGregor and Stephen Moorbath demonstrated that the Isua supracrustal belt (Greenland) and its surrounding orthogneisses formed in the Eoarchean (Moorbath et al., 1972, 1973). Fifty years later, these rocks are a key resource globally for understanding the Eoarchean Earth.

The Isua Greenstone Belt is one of the oldest rock formations on Earth, aged between 3.7 – 3.8 billion years. Since its discovery, the Greenstone Belt has been thoroughly studied since it houses one of the oldest and best preserved ancient plate tectonic sequences.

2002年1月1日 · New geological investigations in the c. 3.7–3.8 Ga Isua Greenstone Belt in West Greenland have revealed that the belt comprises a number of separate structural domains. Five such domains have been identified on the basis of lithological and structural differences.

2001年1月31日 · The Isua greenstone belt (Fig. 1) contains the oldest known, relatively well preserved, metavolcanic and metasedimentary rocks on Earth. The rocks are all deformed and many were substantially altered by metasomatism, but both the deformation and metasomatism were heterogeneous.

2025年1月3日 · The Isua greenstone belt in West Greenland is about 3.85 billion years old. In the Zimbabwean craton, they formed over three successive periods: the Selukwe belt about 3.8 to 3.75 billion years ago, the Belingwean belts about 2.9 billion years ago, and the Bulawayan-Shamvaian belts about 2.7 to 2.6 billion years ago.

2002年4月1日 · The 3.7–3.8 Ga Isua greenstone belt of southwest Greenland is characterized by variably metamorphosed, metasomatised and deformed lithotectonic successions of volcanic and sedimentary rocks. The voluminous mafic volcanic rocks are composed primarily of pillow basalts intercalated with ultramafic units.