Abstract
The Taga Volcano Group of the Izu Peninsula is divided into four volcanoes: Older Taga, Atami, Shimo-Taga and Himenosawa. Each volcano consists of basalt-andesite lavas and volcaniclastic sediments, mainly of low alkali tholeiite composition.
The activity of the Shimo-Taga Volcano is divided into three stages (early, middle and later). Rocks of the first two stages consist of lavas and volcaniclastic sediments of olivine basalt, phyric and aphyric basaltic andesite. The later stage rocks consist of volcaniclastic sediments which were erupted as mudflow deposits.
Basalts and andesites of the first two stages are considered to have been derived from a zoned magma chamber. They were produced by fractional crystallization, which involved the gravitational separation of plagioclase, olivine and/or pyroxene crystals. Eruption of aphyric and phyric basaltic andesite from the upper part of the chamber occurred first, followed by olivine basalt from lower parts of the chamber.
Zusammenfassung
Die Taga-Vulkan Gruppe besteht aus dem älteren Taga, dem Atami, dem Shimo-Taga und dem Himenosawa Vulkan. Jeder dieser Vulkane wird aus basaltisch-andesitischen Laven und vulkano-klastischen Sedimenten, hauptsächlich subalkalisch tholeiitischer Zusammensetzung, aufgebaut.
Die Eruptionstätigkeit des Shimo-Taga Vulkans läßt sich in drei Phasen, eine Früh-, Mittel- und Spätphase untergliedern. Laven und vulkanoklastische Sedimente der ersten beiden Phasen bestehen aus Olivinbasalten, sowie aus basaltischen Andesiten mit porphyrischem und nichtporphyrischem Gefüge. Während des letzten Stadiums wurden vulkanoklastische Sedimente in Form von vulkanoklastischen Schlammströmen eruptiert.
Die Basalte und Andesite der ersten beiden Stadien werden als Produkte einer zonierten Magmenkammer gedeutet. Sie entstanden durch fraktionierte Kristallisation und durch die gravitative Abtrennung von Plagioklas, Olivin und/oder Pyroxenkristallen. Der Eruption der porphyrischen und nichtporphyrischen basaltischen Andesite aus dem obersten Teil der Magmakammer folgte die Eruption von Olivinbasalten aus dem tieferen Teil der Magmakammer.
Similar content being viewed by others
References
Ando A, Mita N, Terashima S (1987) 1986 values for fifteen GSJ rock reference samples, “Igneous rock series”. Geostandards Newsletter 11: 159–166
Arai F, Machida H, Sugihara S (1972) Characteristics of the late Pleistocene marker-tephas of South Kanto, central Japan. Quarternary Research 16: 19–40 (in Japanese with English abstract)
Fujimaki H, Kurasawa H (1979) Geochemistry of major and rare earth elements in a differentiated alkaline dolerite sheet in Atumi district, northern Japan. Jour Japan Assoc Min Pet Econ Geol 74: 311–319
Haskin LA, Haskin MA (1968) Rare earth elements in the Skaergaard intrusion. Geochim Cosmochim Acta 32: 433–447
Hildreth W. (1979) The Bishop Tuff: Evidence for the origin of compositional zonation in silicic magma chambers. In:Chapin CE, Elston WE (eds) Ash flow tuffs Spec Pap Geol Soc Am 180: 43–75
Isshiki N (1960) Explanatory text of the geological map of Japan, 1 :50,000, Miyakejima. Geological Survey of Japan, 1–85 (in Japanese with English abstract)
Kaneoka I, Ozima M, Kuno H (1970) Paleomagnetism and K-Ar ages of successive lava flows (4) K-Ar ages of the Usami Volcano, Izu Peninsula, Japan. Jour Geomag Geoelectr 22: 559–562
Kuno H (1950) Petrology of Hakone volcano and adjacent areas, Japan. Bull Geol Soc Am 61: 957–1020
—(1952) Explanatory text of the geological map of Japan, 1 :75,000, Atami. Geolo Surv of Japan, 1–145 (in Japanese with English abstract)
—— (1953) Formation of calderas and magmatic evolution. Transact Amer Geophsy Union 34: 267–280
—— (1966) Lateral variation of basalt magma type across continental margin and island arcs. Bull volcanol 29: 195–222
Masuda Y, Nishimura S, Ikeda T, Katsui Y (1975) Rare-earth and trace elements in the Quaternary volcanic rocks of Hokkaido, Japan. Chem Geol 15: 251–271
Miyashiro A (1974) Volcanic rock series in island arcs and active continental margins. Am Jour Sci 274: 321–355
Nagasawa H (1973) Rare-earth distribution in alkali rocks from Oki-dogo Island, Japan. Contr Mineral Petrol 39: 301–308
Smith RL, Baily RA (1965) The Bandelier Tuff: a study of ash flow eruption cycles from zoned magma chambers. Bull Volcano 29: 83–103
Suzuki M (1970) Fission track dating and uranium contents of obsidian(II). Quarternary Research 9: 1–6 (in Japanese with English abstract)
Worner G, Schmincke HU (1984a) Mineralogical and chemical zonation of the Laacher See tephra sequence (East Eifel, West Germany). J Petrol 25: 805–835
—— (1984b) Petrogenesis of the zoned Laacher See tephra. J Petrol 25: 836–851
Wright TL, Doherty PC (1970) A linear programming and least square computer method for solving petrologic mixing problems. Bull Geol Soc Am 81: 1955–2008
Yajima T, Higuchi H, Nagasawa H (1972) Variation of rare earth concentrations in pigeonitic and hypersthenic rock series from Izu-Hakone region, Japan. Contr Mineral Petrol 35: 235–244
Zielinski RA, Frey FA (1970) Gough Island: Evaluation of a fractional crystallization model. Contr Mineral Petrol 29: 242–254
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Shimazu, M., Kurihara, K. Petroloy of the Taga Volcano Group, Izu Peninsula, Central Japan. Mineralogy and Petrology 41, 11–24 (1989). https://doi.org/10.1007/BF01164807
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF01164807