Tephrite

Tephrite

The effect of stress level on the compressive strength of the rock samples subjected to cyclic loading

Published in Vladimir Litvinenko, EUROCK2018: Geomechanics and Geodynamics of Rock Masses, 2018

Thin sections were prepared to analyze the mineralogical and petrographic properties of the rock. According to the results of analyses, this rock generally shows porphyritic, microlitic porphyritic and hyalo-microlitic porphyritic texture. It is observed that main components of most of these rocks are leucite, calcitic plagioclase, pyroxene (%20), amphibole (3–5%), biotite (3–5%) and opaque (2%) minerals. The secondary minerals are chlorite, calcite, zeolite and clay minerals. As a result of microscopic examination, this rock is located tephrite/basanite groups. Also, this rock is named as tephrite due to the olivine absence.

Petrogenetic links between the Dunedin Volcano and peripheral volcanics of the Karitane Suite

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Journal Information

Published in New Zealand Journal of Geology and Geophysics, 2018

Oliver E. McLeod, James D. L. White

Eruptive products from Dunedin Volcano span a wide range of compositions (Benson 1968; Coombs and Wilkinson 1969) that reflect high degrees of magmatic differentiation within the large and long-lived magma system of the volcano (Coombs and Wilkinson 1969; Price and Taylor 1973; Price and Chappell 1975). By contrast, most magmas erupted within the smaller-scale monogenetic volcanoes of Waipiata volcanic field underwent only low degrees of differentiation (Coombs et al. 1986), and were of predominantly basanitic compositions. There is evidence at some Waipiata volcanic field centres that magma which fed volcano-forming eruptions intersected more-evolved magma stored in the crust (Nemeth et al. 2003) to produce tephrite-basanite successions.

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The effect of stress level on the compressive strength of the rock samples subjected to cyclic loading

Petrogenetic links between the Dunedin Volcano and peripheral volcanics of the Karitane Suite