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Τι (ποιος) είναι volcanism$90759$ - ορισμός

TWO LARGE IGNEOUS PROVINCES IN SOUTHERN AFRICA AND ANTARCTICA RESPECTIVELY
Karoo volcanism; Karoo Volcanism

Volcanism on the Moon         
  • Orange [[Taurus–Littrow]] soil discovered on the [[Apollo 17]] mission. The orange color is due to microscopic glass beads created by volcanic processes earlier in the Moon's history.
  • hardened]] lava flows of [[Mare Imbrium]] forming [[wrinkle ridge]]s
  • [[Mare Moscoviense]]
  • [[Mare Smythii]]
  • A [[Mare Tranquillitatis]] [[pit crater]] that may represent the partial collapse of a lunar lava tube
  • Overhead view of the [[Marius Hills]]
  • [[Mons Rümker]], a volcanic complex in Oceanus Procellarum
  • Serenitatis]], that sit within its ring. Left of the centerline is Procellarum proper.
WIKIMEDIA LIST ARTICLE
Lunar volcanism; Volcanoes on the Moon; Lunar volcanoes; Volcanism of the Moon
Volcanism on the Moon is represented by the presence of volcanoes, pyroclastic deposits and vast lava plains on the lunar surface. The volcanoes are typically in the form of small domes and cones that form large volcanic complexes and isolated edifices.
Intraplate volcanism         
  • citeseerx= 10.1.1.693.6042 }}</ref> Figure from Foulger (2010).<ref name="Foulger"/>
  • Earth cross-section showing location of upper (3) and lower (5) mantle, ''D″''-layer (6), and outer (7) and inner (9) core
  • publisher=[[Butterworth-Heinemann]]}}</ref>
  • bibcode=2002GSAB..114.1245C }}</ref>
  • url-status=dead }}</ref> In the third and fourth frame in the sequence, the plume forms a "mushroom cap". Note that the core is at the top of the diagram and the crust is at the bottom.
  • mantle]] (in red). The crust may move relative to the plume, creating a ''track''.
  • citeseerx=10.1.1.487.8049 }}</ref>
  • An illustration of competing models of [[crustal recycling]] and the fate of subducted slabs. The plume hypothesis invokes deep subduction (right), while the plate hypothesis focuses on shallow subduction (left).
  • access-date=10 December 2020}}</ref>
  • Regional map of the North East Atlantic. Bathymetry shown in colour; land topography in grey. RR: Reykjanes Ridge; KR: Kolbeinsey Ridge; JMMC: Jan Mayen Microcontinent; AR: Aegir Ridge; FI: Faroe Islands. Red lines: boundaries of the Caledonian orogen and associated thrusts, dashed where extrapolated into younger Atlantic Ocean.<ref name="Foulgeretal2020"/>
VOLCANISM THAT TAKES PLACE AWAY FROM THE MARGINS OF TECTONIC PLATES
Intraplate volcanism is volcanism that takes place away from the margins of tectonic plates. Most volcanic activity takes place on plate margins, and there is broad consensus among geologists that this activity is explained well by the theory of plate tectonics.
Karoo-Ferrar         
The Karoo and Ferrar Large Igneous Provinces (LIPs) are two large igneous provinces in Southern Africa and Antarctica respectively, collectively known as the Karoo-Ferrar, Gondwana,E.g.

Βικιπαίδεια

Karoo-Ferrar

The Karoo and Ferrar Large Igneous Provinces (LIPs) are two large igneous provinces in Southern Africa and Antarctica respectively, collectively known as the Karoo-Ferrar, Gondwana, or Southeast African LIP, associated with the initial break-up of the Gondwana supercontinent at c. 183 Ma. Its flood basalt mostly covers South Africa and Antarctica but portions extend further into southern Africa and into South America, India, Australia and New Zealand.

Karoo-Ferrar formed just prior to the breakup of Gondwana in the Lower Jurassic epoch, about 183 million years ago; this timing corresponds to the early Toarcian anoxic event and the Pliensbachian-Toarcian extinction. It covered about 3 x 106 km2. The total original volume of the flow, which extends over a distance in excess of 6000 km (4000 km in Antarctica alone), was in excess of 2.5 x 106 km³ (2.5 million cubic kilometres).

The Ferrar LIP is notable for long-distance transport and the Karoo LIP for its large volume and chemical diversity.

The igneous activity of the Karoo LIP began c. 204 Ma at the northern margin of the province. The long-lasting Chon-Aike Province in Patagonia, the Antarctic Peninsula, and Ellsworth Land was activated c. 190 Ma in an unstable tectonic environment in which both extension and subduction occurred. Chon-Aike had a peak between 183 to 173 Ma but produced continued magmatism between 168 to 141 Ma. By 184 to 175 Ma the Karoo magmatism had spread to Namibia, Lesotho, Lebombo, and the Ferrar province in Antarctica. The Karoo LIP ended 145 Ma with peripheral eruptions in Patagonia, the Antarctica Peninsula, northern South Africa, Kerala in India, and southeast Australia. The Karoo Province uplifted southern Africa c. 1.5 km (0.93 mi) and broke East Gondwana (India, Antarctica, and Australia) away from West Gondwana (South America and Africa) beginning in the opening of the Weddell Sea.

In the Cretaceous, some 15 million years after the last Karoo eruption, renewed magmatism was initiated between Mary Byrd Land in Antarctica and New Zealand from where it spread along Gondwana's southern margin, from eastern Australia to the Antarctic Peninsula. Isotopic dating suggests a series of igneous events at 133–131, 124–119, and 113–107 Ma in Australia; 110–99 Ma in Mary Byrd Land; 114-109 and 82 Ma in New Zealand; and 141 and 127 Ma in the Antarctic Peninsula. This phase of magmatism resulted in extension and rift between Australia and Antarctica, Australia and Lord Howe Rise, and Mary Byrd Land and New Zealand.