Results 161 to 170 of about 1,251 (191)
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Assessing the potential for cryptotephra studies in Northeastern China
The Holocene, 2015Quaternary tephrochronology and tephrostratigraphy are employed globally for chronological control and site correlation, but the potential for these approaches in Northeastern China has not been fully explored, in spite of this being a volcanically active region. Microscopic and precise electron microprobe geochemical analyses were performed on crypto-
Zhao, Hongli, Hall, Valerie A.
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Original Detection Methods for Tephra Layers and Cryptotephras
2014The building of independent and accurate chronologies is crucial to correlate environmental and climatic changes as reflected in biotic as well as abiotic signals from continental lacustrine sediments. The use of tephras, which are instantaneous and synchronous atmospheric deposits, as time-parallel markers, allows independent, high-precision regional ...
Gwénolé Jouannic +5 more
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European Journal of Protistology, 2016
Cryptotephra (particles
Leonardo D Fernández +2 more
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Cryptotephra (particles
Leonardo D Fernández +2 more
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Advancements and best practices for analysis and correlation of tephra and cryptotephra in ice
Quaternary Geochronology, 2017Geochemical analysis of fine grained (
Nels A Iverson +2 more
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First discovery of cryptotephra in Holocene peat deposits of Estonia, eastern Baltic
Boreas, 2006This article reports the first discovery of middle Holocene cryptotephra from a peat sequence in Estonia, eastern Baltic. Two sequences, Mustjärve and Parika (located 110 km apart), were chosen for a pilot study aimed at finding traces of tephra fallout during the middle Holocene. Peat accumulation at both sites started in the early Holocene (c.
TIIT HANG +3 more
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Evidence for distal transport of reworked Andean tephra: Extending the cryptotephra framework from the Austral volcanic zone [PDF]
Quaternary Geochronology, 2019 Abstract Cryptotephra deposits (non-visible volcanic ash beds) may extend thousands of kilometres and provide valuable chronological isochrons. Here, we present a Lateglacial-early Holocene (c. 16,500 cal yr BP-6000 cal yr BP) tephrostratigraphy from Hooker's Point, East Falkland, South Atlantic.
Monteath, A.J. +2 more
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Marine Geology, 2013
Abstract We present new compositional data on glass shards from cryptotephra layers in five marine sediment cores from the southern Japan/East Sea. The hand-picked glass shards were extracted from cryptotephra horizons that were distinguished by SEM/EDS for major elements and INAA for trace elements on individual shards. Most of the glass shards have
Chungwan Lim, Insung Lee, Ken Ikehara
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Abstract We present new compositional data on glass shards from cryptotephra layers in five marine sediment cores from the southern Japan/East Sea. The hand-picked glass shards were extracted from cryptotephra horizons that were distinguished by SEM/EDS for major elements and INAA for trace elements on individual shards. Most of the glass shards have
Chungwan Lim, Insung Lee, Ken Ikehara
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Geochimica et Cosmochimica Acta, 2008
Abstract Detection techniques for invisible tephra, known as cryptotephra, have been exploited to construct precise and high-resolution correlations for a broad range of sedimentary sequences. We demonstrate that continuous trace-element profiles are an effective means for detecting probable positions of distal cryptotephra in Holocene hemipelagic ...
Chungwan Lim +2 more
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Abstract Detection techniques for invisible tephra, known as cryptotephra, have been exploited to construct precise and high-resolution correlations for a broad range of sedimentary sequences. We demonstrate that continuous trace-element profiles are an effective means for detecting probable positions of distal cryptotephra in Holocene hemipelagic ...
Chungwan Lim +2 more
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Quaternary Research, 2011
AbstractWe detected late Pleistocene cummingtonite-bearing cryptotephras in loess deposits in NE Japan and correlated them with known tephras elsewhere by using major-element compositions of the cummingtonite. This is the first time cryptotephras have been identified by analysis of a crystal phase rather than glass shards.
Tabito Matsu'ura +2 more
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AbstractWe detected late Pleistocene cummingtonite-bearing cryptotephras in loess deposits in NE Japan and correlated them with known tephras elsewhere by using major-element compositions of the cummingtonite. This is the first time cryptotephras have been identified by analysis of a crystal phase rather than glass shards.
Tabito Matsu'ura +2 more
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Cryptotephra deposition and preservation in four sub-Arctic lakes in Yukon, Canada
2021Cryptotephra research is one of the fastest growing subfields of tephrochronology. Here the extraction, processing, and analytical techniques required for cryptotephra studies are reviewed and assessed in detail. A workflow is suggested depending on the site’s characteristics to improve the quality of data.
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