期刊
GEOPHYSICAL RESEARCH LETTERS
卷 40, 期 14, 页码 3538-3543出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/grl.50645
关键词
tephra; Arctic; Kamchatka; explosive eruption; Pacific
资金
- BMBF [03G0586A, B]
- Otto Schmidt Laboratory
- Russian Foundation for Basic Research [13-05-00346]
Very few age controls exist for Quaternary deposits over the vast territory of the East Russian Arctic, which hampers dating of major environmental changes in this area and prevents their correlation to climatic changes in the Arctic and Pacific marine domains. We report a newly identified similar to 177ka old Rauchua tephra, which has been dispersed over an area of >1,500,000 km(2) and directly links terrestrial paleoenvironmental archives from Arctic Siberia with marine cores in the northwest Pacific, thus permitting their synchronization and dating. The Rauchua tephra can help to identify deposits formed in terrestrial and marine environments during the oxygen isotope stage 6.5 warming event. Chemical composition of volcanic glass from the Rauchua tephra points to its island-arc origin, while its spatial distribution singles out the Kamchatka volcanic arc as a source. The Rauchua tephra represents a previously unknown, large (magnitude >6.5) explosive eruption from the Kamchatka volcanic arc.
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