Significance of K-Ar age of bimodal volcanic rocks at Wangtian’e volcano, Changbaishan area

Powers outlines the general features of the geology of Hawaii and the life history of Hawaiian volcanoes. The lava flow forming Laupahoehoe peninsula issued from fissures near the mouth of Laupahoehoe Valley. Two major and three minor flows comprise lava from the 1801 eruption of Hualalai. Puu o Keokeo on Mauna Loa is not an independent volcanic center. Pillow lavas are absent on the island of Hawaii, unless in a flow between Waipio and Waimanu valleys. Cinder cones along the southwest coast were formed by lava entering the sea. No trachyte was found in the Kohala Mountains. The trachyte of Puu Anahulu is a flow more than 100 ft thick, and origin of the trachyte by assimilation of limestone in basalt is improbable, owing to the lack of available limestone. The Uwekahuna laccolith at Kilauea is a filled lava tube. Powers quotes unpublished information from L.A. Thurston regarding eruption around 1750 on the southwest side of Haleakala and describes the 1750 flow as olivine-rich aa. He lists localities of nepheline basalt and briefly describes xenoliths as cognate inclusions produced at depth. He repeats stories of earthquake and submarine volcanic activity elsewhere in the island chain, associated in time with events at Kilauea or Mauna Loa.

Trachyte

Xenolith

Lava field

Mudflow

Cinder cone

Shield volcano

10.2475/ajs.s4-50.298.256

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Structural variation and the development of thick rhyolite lava: A case study of the Sanukayama rhyolite lava on Kozushima Island, Japan

Journal of Volcanology and Geothermal Research (2018)

Kuniyuki Furukawa Koji Uno Tatsuo Kanamaru Kotaro Nakai

Lava field

Lava dome

Effusive eruption

Breccia

10.1016/j.jvolgeores.2018.11.001

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Citations (9)

The Geochemistry Research on Eocene Volcanic Rocks in Sanshui Basin

Applied Mechanics and Materials (2013)

Wei Zhang Nian Qiao Fang

Guangdong Sanshui Basin evoluted with extreme volcanic activities. Eruptions between Paleocene to Eocene were concentrated on Xinzhuang, Buxin, Baoyue and Huayong formations. For realized the relationship between various kind of rocks, Geochemistry analysis such as multi-element and rare-earth element determination were launched on Basalt, Trachyte and Rhyolite samples from the research area. Geochemistry diagram suggest that: REE distribution of Basalt followed as mid-plate alkali Basalt mode, while their trace element spider diagrams act as continental alkali Basalt with Nb, Ti rich and Sr loss. REE distribution of Trachyte and Rhyolite are similar, which indicate the same crystalization separation process. S-B diagram and Pearce diagram show that: Granite were partial melted from source region, while Trachyte in ZMY and Rhyolite in LBS originated from the same source region, and occur with the process of crystallization separation with plagioclase adventage.

Trachyte

Fractional crystallization (geology)

Incompatible element

Trace element

Petrogenesis

10.4028/www.scientific.net/amm.275-277.322

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Citations (1)

Petrologic study of volcanic rocks from the Mafujiyama Formation in Ryuso Group

Genjyu YAMAMOTOSeishi Yong Ui Kim

The middle Miocene Mafujiyama Formation is distributed in the southwest part of the South Fossa Magna. The Mafujiyama Formation consists of subaqueous volcanic rockssuch as hyaloclastite.This Formation is divided into the Jizoutouge rhyolite and the Monjyudake trachyte members.The Jizoutouge rhyolite member consists of volcanic rocks and mudstone.These volcanic rocks consist of rhyolite and trachyte.The Monjyudake trachyte member consists of volcanic rocks and mudstone.The volcanic rocks consist of the trachytetrachyandesite and alkaline basalt.SiO contents ranges from 50.51 to 74.94%. As FeO/MgO versus some oxide and minor element contents shows linear relation.There are three type fractional crystallization.From the above datait is suggested that the Mafujiyama formation forming volcanic rocks consist of alkali rocks and subalkli rocks series. Volcanic rocks of the Mafujiyama formation can be assumed to erupt in the tensional place based upon petrologic character.

Trachyte

Volcanic plateau

Source

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Rotational deformation of a rhyolite lava flow below the Curie temperature of magnetite: Sanukayama rhyolite lava in Kozushima Island, Japan

Japan Geoscience Union (2017)

Kotaro Nakai Kuniyuki Furukawa Tatsuo Kanamaru Koji Uno

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Post-eruptive degassing pathway of a flow-banded rhyolite lava: A case study of the Takanoobane rhyolite lava of Aso Volcano, Japan

AGUFM (2011)

Kuniyuki Furukawa Koji Uno Isoji Miyagi

Lava dome

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Eruptive History of the Rhyolitic Kane Springs Wash Volcanic Center, Nevada

Collected reprint series (1984)

Steven W. Novak

This chapter contains sections titled: Introduction Geologic Setting Older Kane Wash Tuff Units Precaldera Trachyte Lavas Member V1 Trachyte Air Fall Tuff Member V2 Member V3 Caldera Collapse Postcaldera Trachyte Lavas Central Syenite Complex Intracaldera Ferrodednite-Rhyolite Lavas and Pyroclastics Trachyandesite Lavas Topaz-Bearing Biotite-Rhyolite Domes Late Basalts Discussion

Trachyte

Caldera

10.1002/9781118782095.ch27

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