Trace element abundances in the “Andesite” Formation of Northern Chile

Geochimica et Cosmochimica Acta (1969)

A. Siegers Hans Pichler Werner Zeil

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Trace element

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Geochemistry and Elemental Analysis

Geochemistry and Geologic Mapping

Geological and Geochemical Analysis

10.1016/0016-7037(69)90034-9

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IV.—The Pahang Volcanic Series

Geological Magazine (1917)

E. S. Willbourn

By far the greater part of the volcanic rocks of Malaya consists of fragmental deposits, which at first sight seem to be andesite-tuffs and andesite-breccias, for most of them contain abundant fragments of andesitic lava. However, the majority also contain numerous fragments of quartz, some of which occur as isolated angular grains in the cement, others embedded in a very fine-grained siliceous rock, and sometimes showing rounded outlines and even bays, invaded by the siliceous aggregate. Tuffs which occur in certain localities, e.g. at Kuala Tekal, Tembeling, and Sibah near Kuala Lipis on the Pahang railway, contain the usual fragments of andesite-lava, with numerous fragments of quartz like those just described, and in addition fragments of rhyolite-lava or quartz-porphyry. It is probable that the great majority of the Pahang Volcanic Series of tuffs are formed of an admixture of andesitic, rhyolitic, and sedimentary material.

Breccia

10.1017/s0016756800136568

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Geomorphic and Structural Relations of Tertiary Volcanics in the Northern Teton Range and Jackson Hole, Wyoming

The Journal of Geology (1955)

Leland Horberg R. W. Edmund Fritiof Fryxell

The relations of Yellowstone Tertiary volcanics to Tertiary faults in the Teton Range indicate that major movements probably occurred in early Pliocene time, following deposition of Miocene basic volcanics and associated sediments and prior to outpourings of plateau rhyolite, and that minor movements continued into Recent time. Erosion surfaces representing the late-mature stage Black Rock cycle are covered by the rhyolite. This relationship and the youthful geomorphic aspect of the rhyolite plateau indicate that the rhyolite and younger valley basalt are probably of early, or early middle, Pleistocene age. More precise dating of the rhyolite depends upon the age assigned to the Buffalo drift, which rests on these volcanics.

Volcanic plateau

10.1086/626292

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Citations (3)

SR isotope geochemistry of voluminous rhyolite of the Tamagawa Welded Tuffs, related rocks and andesite of the young volcanics, in Hachimantai geothermal area, Northeast Japan

Journal of Volcanology and Geothermal Research (1985)

S. Togashi Teruo Shirahase Shirô Tamanyu

Isotope Geochemistry

Trachyte

10.1016/0377-0273(85)90076-9

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