Ages of calderas, large explosive craters and active volcanoes in the Kuril-Kamchatka region, Russia

被引:58
|
作者
Braitseva, OA [1 ]
Melekestsev, IV [1 ]
Ponomareva, VV [1 ]
Sulerzhitsky, LD [1 ]
机构
[1] INST GEOL,MOSCOW 109017,RUSSIA
关键词
caldera ages; explosive crater ages; active volcanoes; Kuril-Kamchatka; Russia;
D O I
10.1007/s004450050100
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The ages of most of calderas, large explosive craters and active volcanoes in the Kuril-Kamchatka region have been determined by extensive geological, geomorphological, tephrochronological and isotopic geochronological studies, including more than 600 C-14 dates. Eight 'Krakatoa-type' and three 'Hawaiian-type' calderas and no less than three large explosive craters formed here during the Holocene. Most of the Late Pleistocene Krakatoa-type calderas were established around 30 000-40 000 years ago. The active volcanoes are geologically very young, with maximum ages of about 40 000-50 000 years. The overwhelming majority of recently active volcanic cones originated at the very end of the Late Pleistocene or in the Holocene. These studies show that all Holocene stratovolcanoes in Kamchatka were emplaced in the Holocene only in the Eastern volcanic belt. Periods of synchronous, intensified Holocene volcanic activity occurred within the time intervals of 7500-7800 and 1300-1800 C-14 years BP.
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页码:383 / 402
页数:20
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