{"id":10058,"date":"2021-11-12T00:00:00","date_gmt":"2021-11-12T00:00:00","guid":{"rendered":"https:\/\/www.nextias.com\/current_affairs\/uncategorized\/12-11-2021\/earths-first-landmass-emerged-in-singhbhum\/"},"modified":"2021-11-12T00:00:00","modified_gmt":"2021-11-12T00:00:00","slug":"earths-first-landmass-emerged-in-singhbhum","status":"publish","type":"post","link":"https:\/\/www.nextias.com\/ca\/current-affairs\/12-11-2021\/earths-first-landmass-emerged-in-singhbhum","title":{"rendered":"Earth\u2019s First Landmass Emerged in Singhbhum"},"content":{"rendered":"<p><span style=\"font-size:13pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong><u>In News<\/u><\/strong><\/span><\/span><\/span><\/span><\/p>\n<ul>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">Scientists have found <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>sandstones in Singhbhum<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"> with geological signatures of ancient river channels, tidal plains and beaches over 3.2 billion years old, representing the earliest crust exposed to air.<\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<p><span style=\"font-size:13pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong><u>Major Findings<\/u><\/strong><\/span><\/span><\/span><\/span><\/p>\n<ul>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>Jharkhand\u2019s Singhbhum region<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">: The Singhbhum district of Jharkhand, famous for its <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>mica mines all over the world<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">, can change the perspective of understanding the whole world.<\/span><\/span><\/span><\/span>\n<ul>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">A new study has challenged the widely accepted view that the continents <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>rose from the oceans about 2.5 billion years ago<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">It suggests this happened 700 million years earlier about 3.2 billion years ago and that the earliest continental landmass to emerge may have been Jharkhand\u2019s Singhbhum region.<\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>Sandstones of Singhbhum<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">: Scientists have found sandstones in Singhbhum with geological signatures of ancient river channels, tidal plains and beaches over 3.2 billion years old, representing the earliest crust exposed to air.<\/span><\/span><\/span><\/span>\n<ul>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">The age was found by analysing the uranium and lead contents of tiny minerals.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">These rocks are 3.1 billion years old and were formed in ancient rivers, beaches, and shallow seas.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">All these water bodies could have only existed if there was continental land.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">Thus, it is been inferred that the Singhbhum region was above the ocean before 3.1 billion years ago<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">Patches of the earliest continental land, however, exist in Australia and South Africa.<\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>Formation theory<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">: The researchers studied the granites that form the continental crust of the Singhbhum region and found that these granites are 3.5 to 3.1 billion years old and formed through extensive volcanism that happened about 35-45 km deep inside the Earth.<\/span><\/span><\/span><\/span>\n<ul>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">They continued on and off for hundreds of millions of years until all the magma solidified to form a thick continental crust in the area.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">Due to the thickness and less density, the continental crust emerged above the surrounding oceanic crust owing to buoyancy.<\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>Other findings<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">: The researchers believe the earliest emergence of continents would have contributed to a proliferation of photosynthetic organisms, which would have increased oxygen levels in the atmosphere.<\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<p><span style=\"font-size:13pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong><u>Significance of the study<\/u><\/strong><\/span><\/span><\/span><\/span><\/p>\n<ul>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>Understanding the existence<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">: At a time when the entire world was debating about changes in climate, it is very important to understand how our atmosphere, oceans and climate came into existence and how they interacted with geological processes operating deep inside Earth to make our planet habitable.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>Link<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">: It allows us to link the interior of Earth to its exterior in deep time.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>Making future studies easy<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">: India has three other ancient continental fragments known as Dharwar, Bastar and Bundelkhand regions.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>The research also tends to break another well-accepted notion<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">: continents rose above the ocean due to plate tectonics, which is the major driver today for increases in the elevation of landmasses.<\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<p><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong><u>Formation of the Earth\u2019s Continents<\/u><\/strong><\/span><\/span><\/span><\/span><\/p>\n<ul>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">Initially, more than <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>4.6-billion years ago<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">, the world was a ball of burning gas, spinning through space.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">At first, <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>superheated gases <\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">were able to escape into outer space, but as the Earth cooled, they were held by gravity to form the early atmosphere.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>Clouds began to develop as water vapour collected<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"> in the air and then it began to pour with rain, causing the early oceans to rise up.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">It took hundreds of millions of years for the<\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong> first landmasses to emerge<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">About 250-million years ago, long, long after the Earth had formed, all the continents of the time had joined together to form a <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>supercontinent called Pangaea.<\/strong><\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">This supercontinent broke up about 200-million years ago to form <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>two giant continents, Gondwana and Laurasia.<\/strong><\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>Gondwana comprised what is now Africa, South America, Australia, Antarctica and India.<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"> The Indian sub-continent lay off the east coast of Africa before it broke off and moved north rapidly.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">It collided with Asia, creating one of the world\u2019s greatest mountain ranges, which extends for more than 2,500 kilometres \u2013 the Himalayas.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">The amazing process of plate tectonics, in which the Earth\u2019s landmasses move slowly across the Earth\u2019s crust, is still continuing.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">Far in the future, some scientists have predicted that the present continents will converge again, to form a new supercontinent.<\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<p style=\"text-align:center\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><img decoding=\"async\" src=\"https:\/\/lh6.googleusercontent.com\/VQvnbY1QTwjtwunn3FFan285HtxJzZPvfIvAZ8zKPJXlboLRkE1TpkZyynHr9o07UGQNBuUDnZNZPJLLBU5I90ubm2x9e79NsMkE1wQMD5342fkxHHXbzjgjCaffI-y_Qvchib5f\" style=\"height:230px; width:458px\" \/><\/span><\/span><\/span><\/span><\/p>\n<p><span style=\"font-size:13pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>Source: <\/strong><\/span><\/span><\/span><\/span><a href=\"https:\/\/indianexpress.com\/article\/explained\/singhbhum-earth-first-landmass-study-7618871\/\" style=\"text-decoration:none\" target=\"_blank\" rel=\"noopener\"><span style=\"font-size:13pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#1155cc\"><span style=\"background-color:#ffffff\"><strong>IE<\/strong><\/span><\/span><\/span><\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In News Scientists have found sandstones in Singhbhum with geological signatures of ancient river channels, tidal plains and beaches over 3.2 billion years old, representing the earliest crust exposed to air. Major Findings Jharkhand\u2019s Singhbhum region: The Singhbhum district of Jharkhand, famous for its mica mines all over the world, can change the perspective of [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":10059,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[21],"tags":[127,25],"class_list":["post-10058","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-current-affairs","tag-geographical-features-their-location","tag-gs1"],"acf":[],"jetpack_featured_media_url":"https:\/\/wp-images.nextias.com\/cdn-cgi\/image\/format=auto\/ca\/uploads\/2023\/07\/5749145Screenshot.png","_links":{"self":[{"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/posts\/10058","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/comments?post=10058"}],"version-history":[{"count":0,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/posts\/10058\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/media\/10059"}],"wp:attachment":[{"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/media?parent=10058"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/categories?post=10058"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/tags?post=10058"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}