Results 51 to 60 of about 10,376 (220)
New Zealand Journal of Geology and Geophysics, Volume 69, Issue 2, June 2026.Clasts of albite‐porphyroblastic quartzofeldspathic schist, derived from the Otago Schist basement, occur within the Port Chalmers Breccia, a diatreme at the centre of the Dunedin stratovolcano, New Zealand. Schists have undergone varying degrees of replacement reactions (at temperatures of 300° to >500°C) producing hornfelses, with Ca‐ and K‐enriched ...
Alan F. Cooper
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Mineralogy of garnets from the Jubileinaya kimberlite pipe and Ottorzhenets kimberlite body
Руды и металлыThe article presents results of a study of the chemical composition of garnet xenocrystals from a concentrate of the heavy fraction of kimberlites from the Yubileinaya pipe and Ottorzhenets kimberlite body.
Milaushkin M. V. +4 more
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, 2015 It is suggested that the Tunguska event in June 1908 cm-large was due to a cm-large ball of a condensate of bound states of 6 top and 6 anti-top quarks containing highly compressed ordinary matter. Such balls are supposed to make up the dark matter as we
Froggatt, C. D., Nielsen, H. B.
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Internal vs. external forcing in shallow marine diatreme formation: a case study from the Iblean Mountains (SE-Siciliy, Central Mediterranean) [PDF]
, 2009 A model of diatreme evolution in a shallow marine setting is based on a multi-disciplinary analysis of diatremes in the Iblean Mountains (Sicily). The approach includes stratigraphic, volcanological, structural, petrologic and compositional data.
Schmincke, Hans-Ulrich, Suiting, Ines
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Restoring the past glory of Diamond Mining in south India- A plausible case of diamondiferous Wajrakarur kimberlite pipe clusters with geochemical evidences [PDF]
International Journal of Mining and Geo-Engineering, 2019 A plausible case of collective and economical mining of diamondiferous kimberlite deposits of Wajrakarur and adjoining places in Andhra Pradesh, southern India along with the whole-rock geochemical evidences in support of their diamond potentiality are ...
Rameshchandra Phani Pothuri
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Geochemistry, Geophysics, Geosystems, Volume 27, Issue 4, April 2026.Abstract The voluminous active volcanoes of the Revillagigedo Islands of Socorro and San Benedicto in the east Pacific Ocean exhibit hotspot geochemistry. However, the presence of a deep mantle plume has not been seismologically confirmed. Instead, a fossil subducted slab is identified in the lower mantle underneath the volcanoes. Moreover, the islands
Janne M. Koornneef +7 more
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Plume genesis of non-kimberlite diamonds
Литосфера, 2015 Calculations shown that a relatively low-temperature kimberlite magmas consolidated with decompression exploded on significant depth and formed pipes.
V. S. Shkodzinskiy
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Spectroscopy of Moses Rock Kimberlite Diatreme [PDF]
, 1985 Three types of remote sensing data (Airborne Imaging Spectroscopy (AIS), NS001, Zeiss IR-photographs) were obtained for the Moses Rock kimberlite dike in southern Utah.
Mustard, J. F., Pieters, C. M.
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Petrography and mineral chemistry of Northeast Africa 053—A remnant of Martian crystal mush
Meteoritics &Planetary Science, Volume 61, Issue 4, Page 621-643, April 2026.Abstract In Earth's igneous systems, crystal mushes, crystal‐rich frameworks permeated by silicate melt, represent a common and fundamental stage in the evolution of magma bodies. However, whether crystal mushes occur within Martian igneous systems and play a comparable role is unknown. Here, we present a comprehensive petrography and mineral chemistry
Xhonatan Shehaj +2 more
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A crustal-upper-mantle model for the Colorado Plateau based on observations of crystalline rock fragments in the Moses Rock Dike [PDF]
, 1972 On the basis of the size, the abundance, and the petrographic character of xenoliths in the Moses Rock dike, a model for the vertical stratigraphy of crystalline rocks beneath the dike is proposed extending from near the surface to a depth of about 200 ...
McGetchin, Thomas R., Silver, Leon T.
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