Results 121 to 130 of about 2,061 (160)
Physical modeling of diatreme emplacement
International Kimberlite Conference Extended Abstracts: 1973, 2019 openaire +2 more sources
Volcanology of the Ellendale diatremes
International Kimberlite Conference Extended Abstracts: 1986, 2019 openaire +2 more sources
Some of the next articles are maybe not open access.
Related searches:
Related searches:
Modeling of diatreme emplacement by fluidization
Physics and Chemistry of the Earth, 1975Abstract A series of experiments utilizing fluidization techniques was conducted in an effort to evaluate this mechanism for diatreme emplacement. Various sized containers were constructed in various cylindrical, parallel plate, and box-like configurations, and all were attached at their base to a large volume compressed air source.
T.S. WOOLSEY, M.E. MCCALLUM, S.A. SCHUMM
openaire +1 more source
Economic Geology, 1964
Radiometric ages of Siberian kimberlite breccias are consistently in the range 610-695 million years, yet on the basis of sound geologic evidence, the breccias were intruded sometime between the Ordovician and early Cretaceous. These data, together with the absence of contact metamorphic effects, indicate that the breccias were intruded as a slurry of ...
openaire +1 more source
Radiometric ages of Siberian kimberlite breccias are consistently in the range 610-695 million years, yet on the basis of sound geologic evidence, the breccias were intruded sometime between the Ordovician and early Cretaceous. These data, together with the absence of contact metamorphic effects, indicate that the breccias were intruded as a slurry of ...
openaire +1 more source
New Zealand Journal of Geology and Geophysics, 1980
Abstract Cutting the Tertiary sedimentary rocks of Ngatatura Bay is a well-exposed example of a diatreme. The exposure probably lies within 50 m of the Pleistocene land surface through which the explosion crater was punched. The initial explosions were followed by weak strombolian eruptions of basalt lava forming a rewelded spatter deposit, and finally
openaire +1 more source
Abstract Cutting the Tertiary sedimentary rocks of Ngatatura Bay is a well-exposed example of a diatreme. The exposure probably lies within 50 m of the Pleistocene land surface through which the explosion crater was punched. The initial explosions were followed by weak strombolian eruptions of basalt lava forming a rewelded spatter deposit, and finally
openaire +1 more source
Diamantiferous diatremes; reply
Economic Geology, 1965In the discussion by A. P. Lebedev and A. S. Trofimov (p. 784-786), it is pointed out that Czechoslovakian diatremes are basaltic or basalt cementing detrital kimberlite and therefore not comparable to those of the Siberian platform. Discrepancies between geologic age and K-Ar ages of kimberlites are not real but are due to introduced argon.
openaire +1 more source
Formation of phreatomagmatic maar-diatreme volcanoes and its relevance to kimberlite diatremes
Physics and Chemistry of the Earth, 1975Abstract Studies of maars and diatremes suggest a specific process in their formation. Magma rises along a fissure and contacts ground- or surface derived water. The resulting phreatomagmatic eruptions give rise to base surge and air-fall deposits consisting of juvenile and wall-rock material.
openaire +1 more source