New England hotspot

The New England hotspot, also referred to as the Great Meteor hotspot, is a long-lived volcanic hotspot in the Atlantic Ocean. The hotspot's most recent eruptive center is the Great Meteor Seamount, and it probably created a short line of mid to late-Cenozoic age seamounts on the African Plate but appears to be currently inactive.[1]

The New England hotspot track is used to estimate the movement of the North American Plate away from the African Plate from early Cretaceous period to the present.[1]

The New England hotspot has been overridden by the Mid-Atlantic Ridge.

Hotspots
The New England hotspot is marked 28 on map.
Portion of the New England hotspot
A portion of the track of the New England hotspot. The westernmost white dot is Mont Royal in Montreal. The white dot just off the continental shelf is the Bear seamount.

Geologic history

About 200 million years ago, just as the Atlantic Ocean was starting to form, the area northwest of Hudson Bay was over the New England hotspot. About 50 million years later, as the Atlantic Ocean opened slightly, the plume was under present-day Ontario, creating numerous kimberlite fields. About 125 million years ago, the hotspot created the magma intrusions of the Monteregian Hills in southern Quebec, Canada. The lack of an obvious track west of the Monteregian Hills may be due either to failure of the plume to penetrate the Canadian Shield, to the lack of recognizable intrusions, or to strengthening of the plume when it approached the Monteregian Hills. About 25 million years later, the hotspot created the magma intrusions of the White Mountains in New Hampshire. As the North American Plate moved westward, it created the New England Seamounts between 80 and 100 million years ago. When the hotspot created the New England Seamount chain, it might have been the seventh or eighth most active hotspot of the period. The hotspot declined in activity after it made Nashville Seamount about 83 million years ago. The hotspot created the Corner Rise Seamounts about 75 million years ago. Renewed volcanic activity formed the Seewarte Seamounts 10–20 million years ago.[2]

See also

References

  1. ^ a b Age Progressive Volcanism in the New England Seamounts and the opening of the Central Atlantic Ocean Retrieved on 2007-10-05
  2. ^ A Hundred-Million Year History of the Corner Rise and New England Seamounts Retrieved on 2007-08-05
Attawapiskat kimberlite field

The Attawapiskat kimberlite field is a field of kimberlite pipes located astride the Attawapiskat River in the Hudson Bay Lowlands, in Northern Ontario, Canada. It is thought to have formed about 180 million years ago in the Jurassic period when the North American Plate moved westward over a centre of upwelling magma called the New England hotspot, also referred to as the Great Meteor hotspot.Since June 26, 2008, the De Beers open pit Victor Diamond Mine has been in operation mining two pipes in the field at 52°49′14″N 83°53′00″W, about 90 kilometres (56 mi) west of the community of Attawapiskat. The mine was expected to produce 600,000 carats (120 kg) of diamonds a year.

Bear Seamount

The Bear Seamount is a guyot or flat-topped underwater volcano in the Atlantic Ocean. It is the oldest of the New England Seamounts, which was active more than 100 million years ago. It was formed when the North American Plate moved over the New England hotspot. It is located inside the Northeast Canyons and Seamounts Marine National Monument, which was proclaimed by President of the United States Barack Obama to protect the seamount's biodiversity.

Buell Seamount

The Buell Seamount is a seamount in the Atlantic Ocean. It is part of the New England Seamounts, which was active more than 100 million years ago. It was formed when the North American Plate moved over the New England hotspot.

Caloosahatchee Seamount

The Caloosahatchee Seamount is a seamount in the northern Atlantic Ocean. It is part of the Corner Rise Seamounts, which was active about 75 million years ago. It was formed when the North American Plate moved over the New England hotspot, also known as the Great Meteor Hotspot. The Great Meteor Hotspot also formed various kimberlite fields in Canada, the Monteregian Hills, the White Mountains, the New England Seamounts, and the Seewarte Seamounts, which are the newest volcanoes produced by the New England Hotspot.

Gilliss Seamount

The Gilliss Seamount is a seamount in the Atlantic Ocean. It is part of the New England Seamounts, which was active more than 100 million years ago. It was formed when the North American Plate moved over the New England hotspot.

Gosnold Seamount

The Gosnold Seamount is a guyot in the Atlantic Ocean. It is part of the New England Seamounts, which was active more than 100 million years ago. It was formed when the North American Plate moved over the New England hotspot.

Great Meteor hotspot track

The Great Meteor hotspot track, also referred to as the New England hotspot track, is a vast trail of hotspot magmatism in the Northern Hemisphere. It extends over 5,800 km (3,604 mi) from Nunavut in Northern Canada to the northern Atlantic Ocean. Volcanism in the hotspot track was produced by the New England or Great Meteor hotspot, with the oldest magmatic activity dating back at least 214 million years ago during the Late Triassic period. This makes the Great Meteor track one of the oldest hotspot tracks on Earth. It contains over 80 volcanoes, with the most recognizable ones located in the Atlantic Ocean where they form seamounts.

Gregg Seamount

The Gregg Seamount is a guyot in the Atlantic Ocean. It is a part of the New England Seamounts, which was active more than 100 million years ago. It was formed when the North American Plate moved over the New England hotspot.

Kelvin Seamount

The Kelvin Seamount is a guyot in the Atlantic Ocean. It is part of the New England Seamounts, which was active more than 100 million years ago. It was formed when the North American Plate moved over the New England hotspot. Kelvin Seamount is also known as Kelvin Bank.

Lake Timiskaming kimberlite field

The Lake Timiskaming kimberlite field is Canada's southernmost kimberlite field, located in Northeastern Ontario and western Quebec, Canada. It is within the Lake Timiskaming Structural Zone which contains over 50 kimberlite pipes, several of which are diamondiferous. The Lake Timiskaming kimberlite field formed about 147 million years ago when the North American Plate moved westward over the long-lived New England hotspot, also referred to as the Great Meteor hotspot.

Michael Seamount

The Michael Seamount is a seamount in the Atlantic Ocean. It is part of the New England Seamounts, which was active more than 100 million years ago. It was formed when the North American Plate moved over the New England hotspot.

Mont Mégantic

Mont Mégantic (Abenaki: Namesokanjik) is a monadnock located in Québec, Canada, about 15 km north of the border between Québec and the U.S. states of Maine and New Hampshire.

Mégantic is on the border of the regional county municipalities of Le Granit and Le Haut-Saint-François.

Its summit is the highest point of the latter.

Many geologists believe that Mont Mégantic is a member of the Monteregian Hills formed by the New England hotspot, as it has the same mechanism and depth of intrusion.

Mont Mégantic stands within the watershed of the Saint Lawrence River, which drains into the Gulf of Saint Lawrence.

The east side of Mégantic drains into Rivière Victoria, thence into Lac Mégantic, the Chaudière River, and the St. Lawrence.

The rest of Mégantic drains into Rivière Au Saumon (Salmon River), thence into the Saint-François River, and the St. Lawrence.

Observatoire du Mont Mégantic (OMM) is located on the mountain's summit, which is the highest point in Québec accessible by road.

The mountain is in the middle of the 55 km² Parc national du Mont-Mégantic.

The annual Tour de Beauce bicycle race is routed over Mont Mégantic.

Mytilus Seamount

The Mytilus Seamount is a seamount in the Atlantic Ocean. It is part of the New England Seamounts, which was active more than 100 million years ago. It was formed when the North American Plate moved over the New England hotspot. It is located inside the Northeast Canyons and Seamounts Marine National Monument, which was proclaimed by President of the United States Barack Obama to protect the seamount's biodiversity.

Nashville Seamount

The Nashville Seamount is a seamount in the Atlantic Ocean. It is part of the New England Seamounts, which was active more than 100 million years ago. It was formed when the North American Plate moved over the New England hotspot.

New England Seamounts

The New England Seamounts are an underwater chain of seamounts in the Atlantic Ocean stretching over 1,000 km from the edge of the Georges Bank off the coast of Massachusetts. The chain consists of over twenty extinct volcanic peaks, many rising over 4,000 m from the seabed. It is the longest seamount chain in the North Atlantic and harbours a diverse range of deep sea fauna. Scientists have visited the chain on various occasions to survey the geologic makeup and biota of the region. The chain forms part of the Great Meteor hotspot track, having formed by the movement of the North American Plate over the New England hotspot. The oldest volcanoes that were formed by the same hotspot are northwest of Hudson Bay, Canada. Part of the seamount chain is protected by Northeast Canyons and Seamounts Marine National Monument.

This seamount range has been known under a variety of different gazetted names, including the Kelvin Seamounts, Kelvin Seamount Group, Kelvin Banks, New England Seamount Chain and the Bermuda-New England Seamount Arc.

Physalia Seamount

The Physalia Seamount is a seamount in the Atlantic Ocean. It is part of the New England Seamounts, which was active more than 100 million years ago. It was formed when the North American Plate moved over the New England hotspot. It is located inside the Northeast Canyons and Seamounts Marine National Monument, which was proclaimed by President of the United States Barack Obama to protect the seamount's biodiversity.

Picket Seamount

The Picket Seamount is a seamount in the Atlantic Ocean. It is part of the New England Seamounts, which was active more than 100 million years ago. It was formed when the North American Plate moved over the New England hotspot.

Retriever Seamount

The Retriever Seamount is a seamount in the Atlantic Ocean. It is part of the New England Seamounts, which was active more than 100 million years ago. It was formed when the North American Plate moved over the New England hotspot. It is located inside the Northeast Canyons and Seamounts Marine National Monument, which was proclaimed by President of the United States Barack Obama to protect the seamount's biodiversity.

Volcanology of Eastern Canada

The volcanology of Eastern Canada includes the hundreds of volcanic areas and extensive lava formations in Eastern Canada. The region's different volcano and lava types originate from different tectonic settings and types of volcanic eruptions, ranging from passive lava eruptions to violent explosive eruptions. Eastern Canada has very large volumes of magmatic rock called large igneous provinces. They are represented by deep-level plumbing systems consisting of giant dike swarms, sill provinces and layered intrusions. The most capable large igneous provinces in Eastern Canada are Archean (3,800-2,500 million years ago) age greenstone belts containing a rare volcanic rock called komatiite.

Languages

This page is based on a Wikipedia article written by authors (here).
Text is available under the CC BY-SA 3.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.