scholarly journals Volcanic activity and the K-Ar ages of Kurofuji Volcano and the adjacent volcanic rocks north of the Kofu Basin, central Japan.

1994 ◽  
Vol 89 (1) ◽  
pp. 15-20 ◽  
Author(s):  
Koji MIMURA ◽  
Ken SHIBATA ◽  
Shigeru UCHIUMI
Keyword(s):  
Volcanic Activity ◽  
Volcanic Rocks ◽  
Central Japan

scholarly journals The main pulse of the Siberian Traps expanded in size and composition

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
L. E. Augland ◽  
V. V. Ryabov ◽  
V. A. Vernikovsky ◽  
S. Planke ◽  
A. G. Polozov ◽  
...  
Keyword(s):  
Volcanic Activity ◽  
Volcanic Rocks ◽  
West Siberia ◽  
Main Pulse ◽  
Environmental Consequences ◽  
Siberian Traps ◽  
Minimum Age ◽  
Area North ◽  
Permian Mass Extinction ◽  
Compositional Diversity

AbstractEmplacement of large volumes of (sub)volcanic rocks during the main pulse of the Siberian Traps occurred within <1 m.y., coinciding with the end-Permian mass extinction. Volcanics from outside the main Siberian Traps, e.g. Taimyr and West Siberia, have since long been correlated, but existing geochronological data cannot resolve at a precision better than ~5 m.y. whether (sub)volcanic activity in these areas actually occurred during the main pulse or later. We report the first high precision U-Pb zircon geochronology from two alkaline ultramafic-felsic layered intrusive complexes from Taimyr, showing synchronicity between these and the main Siberian Traps (sub)volcanic pulse, and the presence of a second Dinerian-Smithian pulse. This is the first documentation of felsic intrusive magmatism occurring during the main pulse, testifying to the Siberian Trap’s compositional diversity. Furthermore, the intrusions cut basal basalts of the Taimyr lava stratigraphy hence providing a minimum age of these basalts of 251.64 ± 0.11 Ma. Synchronicity of (sub)volcanic activity between Taimyr and the Siberian Traps imply that the total area of the Siberian Traps main pulse should include a ~300 000 km2 area north of Norilsk. The vast aerial extent of the (sub)volcanic activity during the Siberian Traps main pulse may explain the severe environmental consequences.

II.—Contributions to the Study of Volcanos

1876 ◽  
Vol 3 (1) ◽  
pp. 5-15 ◽  
Author(s):  
John W. Judd
Keyword(s):  
Volcanic Activity ◽  
Volcanic Rocks ◽  
Southern Europe ◽  
Considerable Distance ◽  
The Alps ◽  
Great Portion ◽  
Tertiary Period ◽  
Lake Basins

In our last chapter we referred to the frequency of the occurrence of lakes in districts which contain volcanos that are still active or have only recently become extinct. In connexion with this subject, we must also call attention to the interesting circumstance that, wherever the geologist finds evidence of the former action of subaerial volcanos, there he almost invariably detects proofs also, that numerous lakes have been formed and successively filled up with sediments. Very strikingly is this fact illustrated among the great series of volcanic rocks, which, during a great portion of the Tertiary period, were being erupted in Central and Southern Europe; and which form an almost complete girdle surrounding, but lying at a considerable distance from, the great central masses of the Alps. We have in these districts the most unmistakable palæontological evidence that the periods of violent volcanic activity were also characterized by the repeated formation and filling up of lake-basins.

scholarly journals Middle Miocene to Recent volcanic rocks and their alteration in the Agatsuma area, Gunma Prefecture, central Japan

2016 ◽  
Vol 122 (8) ◽  
pp. 397-412
Author(s):  
Shohachi Nakamura ◽  
Koichiro Fujimoto ◽  
Toshio Nakayama ◽  
Shigeharu Houchigai
Keyword(s):  
Middle Miocene ◽  
Volcanic Rocks ◽  
Central Japan

Major eruption-induced changes to the McDonald Islands, southern Indian Ocean

2005 ◽  
Vol 17 (2) ◽  
pp. 259-266 ◽  
Author(s):  
JON STEPHENSON ◽  
G.M. BUDD ◽  
J. MANNING ◽  
P. HANSBRO
Keyword(s):  
Volcanic Activity ◽  
Satellite Image ◽  
Volcanic Rocks ◽  
Volcanic Complex ◽  
Cruise Ship ◽  
Heard Island ◽  
Eudyptes Chrysolophus ◽  
Induced Changes ◽  
Major Eruption ◽  
Eruptive Behaviour

The McDonald Islands (53°S, 73°E) originally comprised three small islands that lie on the Kerguelen Plateau, 44 km west of Heard Island. No volcanic activity was observed since their discovery in 1874 until 1997, when two passing ships recorded major changes and eruptive behaviour. A 2001 satellite image showed that the main island had doubled its area. This paper reports observations made from a cruise ship in November 2002, supplemented by a high-resolution satellite image acquired in March 2003. A new volcanic complex comprises lava domes, spines and flows, all assumed to be phonolitic, similar to the older volcanic rocks. The complex shows dormant volcanic activity, with numerous fumaroles, recent spine evolution and lava flows. Changes in relative sea level have connected Flat and McDonald Islands. A spit about 1km long with extensive shoals beyond, now extends eastward from McDonald Island and presents new hazards to shipping. Biological changes include colonization by king penguins (Aptenodytes patagonica), previously absent, and a large reduction in numbers of formerly widespread macaroni penguins (Eudyptes chrysolophus chrysolophus).

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