A Guide to the Chemical Classification of the Common Volcanic Rocks

A system is presented whereby volcanic rocks may be classified chemically as follows:I. Subalkaline Rocks:A. Tholeiitic basalt series:Tholeiitic picrite-basalt; tholeiite; tholeiitic andesite.B. Calc-alkali series:High-alumina basalt; andesite; dacite; rhyolite.II. Alkaline Rocks:A. Alkali olivine basalt series:(1) Alkalic picrite–basalt; ankaramite; alkali basalt; hawaiite; mugearite; benmorite; trachyte.(2) Alkalic picrite–basalt; ankaramite; alkali basalt; trachybasalt; tristanite; trachyte.B. Nephelinic, leucitic, and analcitic rocks.III. Peralkaline Rocks:pantellerite, commendite, etc.

[1]  S. Simons,et al.  Geology of Great Sitkin Island , 1955 .

[2]  J. Eaton,et al.  The 1961 eruption of Kilauea Volcano, Hawaii , 1964 .

[3]  H. Drewes,et al.  Geology of Unalaska Island and adjacent insular shelf, Aleutian Islands, Alaska , 1961 .

[4]  G. D. Fraser,et al.  Geology of the Delarof and westernmost Andreanof Islands, Aleutian Islands, Alaska , 1959 .

[5]  R. Maitre.  Petrology of Volcanic Rocks, Gough Island, South Atlantic , 1962 .

[6]  G. A. Macdonald,et al.  Variations in the Lava of the 1959 Eruption in Kilauea Iki , 1961 .

[7]  P. E. Baker,et al.  The volcanological report of the Royal Society expedition to Tristan da Cunha, 1962 , 1964, Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences.

[8]  C. E. Tilley,et al.  Origin of Basalt Magmas: An Experimental Study of Natural and Synthetic Rock Systems , 1962 .

[9]  W. Wise.  Geology and Petrology of the Mt. Hood Area: A Study of High Cascade Volcanism , 1969 .

[10]  G. A. Macdonald,et al.  CONTRIBUTION TO THE PETROGRAPHY OF HALEAKALA VOLCANO, HAWAII , 1946 .

[11]  H. A. Coombs.  MT. Baker, a Cascade Volcano , 1939 .

[12]  H. Kuno.  Lateral variation of basalt magma type across continental margins and Island Arcs , 1966 .

[13]  R. Coats,et al.  Geologic Reconnaissance of Kiska Island Aleutian Islands, Alaska , 1961 .

[14]  W. Q. Kennedy.  Trends of differentiation in basaltic magmas , 1933 .

[15]  C. G. Engel,et al.  Chemical Characteristics of Oceanic Basalts and the Upper Mantle , 1965 .

[16]  D. Coombs,et al.  Lineages and Fractionation Trends in Undersaturated Volcanic Rocks from the East Otago Volcanic Province (New Zealand) and Related Rocks , 1969 .

[17]  H. Winchell.  HONOLULU SERIES, OAHU, HAWAII , 1947 .

[18]  H. Kuno.  Origin of cenozoic petrographic provinces of Japan and surrounding areas , 1959 .

[19]  A. McBirney,et al.  Petrology of the Island of Tahiti , 1968 .

[20]  S. J. Shand.  The Nomenclature Of Petrology , 1921, Geological Magazine.

[21]  G. A. Macdonald.  Petrography of the island of Hawaii , 1949 .

[22]  R. Coats.  MAGMATIC DIFFERENTIATION IN TERTIARY AND QUATERNARY VOLCANIC ROCKS FROM ADAK AND KANAGA ISLANDS, ALEUTIAN ISLANDS, ALASKA , 1952 .