Basaltic andesite in the context of Andesite

The tholeiitic magma series (/ˌθoʊleɪˈɪtɪk/) is one of two main magma series in subalkaline igneous rocks, the other being the calc-alkaline series. A magma series is a chemically distinct range of magma compositions that describes the evolution of a mafic magma into a more evolved, silica rich end member. Rock types of the tholeiitic magma series include tholeiitic basalt, ferro-basalt, tholeiitic basaltic andesite, tholeiitic andesite, dacite and rhyolite. The variety of basalt in the series was originally called tholeiite but the International Union of Geological Sciences recommends that tholeiitic basalt be used in preference to that term.

Tholeiitic rock types tend to be more enriched in iron and less enriched in magnesium and aluminium than calc-alkaline rock types. They are thought to form in a less oxidized environment than calc-alkaline rocks. Tholeiitic basalt is formed at mid-ocean ridges and makes up much of the oceanic crust. Almost all the basalt found on the Moon is tholeiitic basalt.

Atlasov Island, known in Russian as Ostrov Atlasova (Остров Атласова), or in Japanese as Araido (阿頼度島), is the northernmost island and volcano and also the highest volcano of the Kuril Islands, part of the Sakhalin Oblast in Russia. The Russian name is sometimes rendered in English as Atlasova Island. Other names for the island include Uyakhuzhach, Oyakoba (Ainu) and Alaid, the name of the volcano on the island.

The island is named after Vladimir Atlasov, a 17th-century Russian explorer who incorporated the nearby Kamchatka Peninsula into Russia. It is essentially the cone of the submarine volcano Vulkan Alaid protruding above the Sea of Okhotsk to a height of 2,285 metres (7,497 feet). The island has an area of 119 square kilometres (46 square miles), and is currently uninhabited. Numerous pyroclastic cones dot the lower flanks of basaltic to basaltic andesite volcano, particularly on the NW and SE sides, including an offshore cone formed during the 1933–34 eruption.

Medicine Lake Volcano is a large shield volcano in northeastern California about 30 mi (50 km) northeast of Mount Shasta. The volcano is located in a zone of east–west crustal extension east of the main axis of the Cascade Volcanic Arc and the Cascade Range. The 0.6 mi (1 km) thick shield is 30 mi (50 km) from east to west and 50 mi (80 km) from north to south, and covers more than 800 sq mi (2,200 km). The underlying rock has downwarped by 0.3 mi (0.5 km) under the center of the volcano. The volcano is primarily composed of basalt and basaltic andesite lava flows, and has a 4 by 7 mi (7 by 12 km) caldera at the center.

The Medicine Lake shield rises about 3,900 ft (1,200 m) above the Modoc Plateau to an elevation of 7,795 ft (2,376 m). Lavas from Medicine Lake Volcano are estimated to be at least 140 cu mi (600 km) in volume, making Medicine Lake the largest volcano by volume in the Cascade Range (Newberry Volcano in Oregon has the second largest volume). Lava Beds National Monument lies on the northeast flank of the volcano.

Chagulak Island (also spelled Chugul, Chugula, Chegoula, or Tchougoulok; Russian: Чагулак) is a small, uninhabited volcanic island in the Islands of Four Mountains group in the Aleutian Islands of southwestern Alaska, United States. The 1.9 mi (3.1 km)-wide island consists of a single cone that reaches an elevation of 3,747 ft (1,142 m). Chagulak is a stratovolcano and is separated from the nearby Amukta Island by a channel about 4.3 miles (6.9 km) wide; though the two islands are joined underwater. No eruptions have been recorded and very little is known about the volcano, as the only study done on Chagulak so far is a single chemical analysis of a "low-potassium, high-alumina basaltic andesite" from the north shore.

Licancabur (Spanish pronunciation: [likaŋkaˈβuɾ]) is a prominent, 5,916-metre-high (19,409 ft) stratovolcano on the Bolivia–Chile border in the Central Volcanic Zone of the Andes. It is capped by a 400–500-metre-wide (1,300–1,600 ft) summit crater which contains Licancabur Lake, a crater lake that is among the highest lakes in the world. There are no glaciers owing to the arid climate. Numerous plants and animal species live on the mountain. The volcanoes Sairecabur and Juriques are north and east of Licancabur, respectively.

Licancabur formed on top of ignimbrites produced by other volcanoes, and has been active during the Holocene. Three stages of lava flows emanated from the edifice and have a young appearance. Although no historical eruptions of the volcano are known, lava flows extending into Laguna Verde have been dated to 13,240±100 years before present, and there may be residual heat in the mountain. The volcano has primarily erupted andesite, with small amounts of dacite and basaltic andesite.