Danakil Depression

The Danakil Depression is the northern part of the Afar Triangle or Afar Depression in Ethiopia, a geological depression that has resulted from the divergence of three tectonic plates in the Horn of Africa.

GEOLOGY

The Danakil Depression lies at the triple junction of three tectonic plates and has a complex geological history. It has developed as a result of Africa and Asia moving apart, causing rifting and volcanic activity. Erosion, inundation by the sea, the rising and falling of the ground have all played their part in the formation of this depression. Sandstone and limestone are overlain by basalt which resulted from extensive lava flows.

LOCATION

The Danakil Depression is a vast plain, some 200 by 50 km (124 by 31 mi), lying in the north of the Afar Region of Ethiopia, near the border with Eritrea. It is about 125 m (410 ft) below sea level and is bordered to the west by the Ethiopian Plateau and to the east by the Danakil Alps, beyond which is the Red Sea.

Comments

CIPW NORMS CALCULATIONS

CIPW NORMS CALCULATIONS The CIPW norm is named after the four petrologists, Cross, Iddings, Pirsson and Washington, who devised it in 1931. What is a Norm and why it is needed? A norm is a means of converting the chemical composition of an igneous rock to an ideal mineral composition. It often reveals similarities in rocks that have quite different modes, or observed mineral assemblages. Some of the factors that can cause such variations are: • Disequilibrium (for example, zoned minerals or reaction rims isolating the interiors of grains) • Temperature • Pressure • Alteration • Water content (otherwise identical rocks might contain biotite, amphibole, or pyroxene, depending on water content) • Other minor constituents. For example, excess sulfur or chlorine might cause scapolite to form instead of feldspar. Boron typically causes tourmaline to form. The CIPW norm calculates mineral composition as if the magma were anhydrous (water is simply treated as a separate phase) and at low press...

FOSSILISED LEAVES FROM JURASSIC PERIOD IN JHARKHAND

Geologists Discover Fossilised Leaves From Jurassic Period in Jharkhand Geologists have found fossilised leaves, estimated to be around 150-200million years old, in Jharkhand's Sahibganj district. A couple of 20 cm by 5 cm fossilised leaves of genus Ptilophyllum have been found in Dudhkol mountain in Taljhari area on 26/09/2020 and further excavation is underway, lead geologist assistant professor Ranjit Kumar Singh of Sahibganj PG College said. The excavation is being conducted in association with National Botanical Research Institute, Lucknow under a project of the Department of Science and Technology of the Union government. "Such leaves were consumed by herbivorous dinosaurs. Smaller fossils from Upper Jurassic to Cretaceous period were earlier found in the region. We might even find fossilised dinosaur eggs during further excavation," Singh told .

THE TOP 10 HIGHEST MOUNTAINS IN THE W0RLD

The snow-capped mountains Himalayan range is the tallest and the youngest in the world. It is also known as the "Abode of God" and people worships the mountain range as a form of divinity. Not only are the mountains a perennial source of water, but also support plant, animal and human life. Adventure seekers and the nature lovers find home in the mountains. 1. Mount Everest, Himalayas, Nepal/Tibet Autonomous Region, China- 8,848 m (29,029 feet) Mount Everest, Sanskrit and Nepali Sagarmatha, Tibetan Chomolungma , Chinese (Pinyin) Zhumulangma Feng or (Wade-Giles romanisation) Chu-mu-lang-ma-Feng , also speller Qomolangma Feng , mountain on the crest of the Great Himalayas of southern Asia that lies on the border between Nepal and Tibet Autonomous Region of China, at 27°59'N 86°56'E. Reaching an elevation of 29,029 feet (8,848 metres), Mount Everest is the highest mountain in the world. Copyright: Arsgera/iStock.com Like other high peaks in the...

Geology_Learn

Search This Blog