Angaran platform
Quick Summary
The Angaran platform is a geological region in Asia containing Archean-age rocks, dating back over 2.5 billion years. This ancient basement rock, primarily composed of gneiss and granulite, shows a development from oceanic crust remnants and volcanic island arcs to more silicon-rich rocks.1
The platform's structure was largely formed between 2.1 and 1.8 billion years ago through repeated collisions. Around 1.45 billion years ago, a rifting event occurred, potentially separating Angara from the North American platform. Later, mountain-building activity began along its margin about 850 million years ago, creating the Baikal mountain belt.1
Evaporite rock formations, such as halite, gypsum, and anhydrite from the late Proterozoic to early Cambrian period, are found on the Angaran platform. These, along with orogenic history, suggest that the Angaran platform may have coalesced with other continental nuclei at the end of the Pan-African episode.1
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AsiaTectonic framework…in that designation are the Angaran (or East Siberian), Indian, and Arabian platforms. There are also several smaller platforms that were deformed to a greater extent than the larger units and are called paraplatforms; those include the North China (or Sino-Korean) and Yangtze paraplatforms, the Kontum block (in
Read More…in that designation are the Angaran (or East Siberian), Indian, and Arabian platforms. There are also several smaller platforms that were deformed to a greater extent than the larger units and are called paraplatforms; those include the North China (or Sino-Korean) and Yangtze paraplatforms, the Kontum block (in
Read More- AsiaThe Precambrian
The basement structure of the Angaran platform was formed for the most part between 2.1 and 1.8 billion years ago by repeated collisions along what have been dubbed the “second-generation greenstone belts.” That interval also corresponds with the most intense granitic intrusive activity in the history of the platform. Some…
Read MoreThe basement structure of the Angaran platform was formed for the most part between 2.1 and 1.8 billion years ago by repeated collisions along what have been dubbed the “second-generation greenstone belts.” That interval also corresponds with the most intense granitic intrusive activity in the history of the platform. Some…
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