Isua greenstone belt | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-03

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Isua_Greenstone_Belt


00:01:15 1 Overview
00:03:39 1.1 Scientific methods
00:04:56 2 Lithologies
00:09:56 3 Tectonics
00:11:16 4 Metamorphism
00:12:22 5 Results of several studies
00:13:00 6 Proposed origin of continental crust
00:14:03 6.1 Formation of the Isua Greenstone Belt
00:17:15 7 Controversies
00:18:35 8 Alternative hypothesis
00:18:46 8.1 Vertical plate tectonics
00:19:27 8.2 Similar evidence
00:20:44 8.3 Evidence for both situations
00:20:54 9 Discovery of early life
00:24:41 10 See also



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SUMMARY
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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. The occurrence of boninitic geochemical signatures, characterized by extreme depletion in trace elements that are not fluid mobile, offers evidence that plate tectonic processes in which lithic crust is melted may have been responsible for the creation of the belt.  Another theory posits that the belt formed via a process known as vertical plate tectonics.In 2016 melting snow revealed putative 3.7-billion-year-old stromatolite fossils, which would be the oldest by several hundred million years thus far discovered on Earth. If confirmed, the discovery of complex stromatolite structures at Isua so early in the history of the Earth would suggest that life first evolved on Earth over 4 billion years ago. There is currently debate over whether the specimens are indeed biogenic, which has been disputed by another research team that visited the site.