GEOCHRONOLOGY OF QUATERNARY TEPHRA DEPOSITS

GEOCHRONOLOGY OF QUATERNARY TEPHRA DEPOSITS
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第四纪火山灰矿床的地质年代学

DOI:
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发表时间:
1981
期刊:
影响因子:
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通讯作者:
G. Izett
G. Izett
中科院分区:
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文献类型:
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作者:
C. Naeser;N. D. Briggs;J. Obradovich;G. Izett

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三种放射性测量方法已被用来确定第四纪火山灰的年代:裂变径迹(F-T),K-Ar和放射性碳(C-14)。裂变径迹法和K~Ar法测定火山碎屑斑晶的年龄是从火山喷发云沉积的源岩浆中获得的,因此可提供火山碎屑的直接年龄。放射性碳测年法只能提供间接的年龄,因为这种方法中使用的碳来自于物质,例如预先存在的木材,在沉积过程中包含在火山灰中,或者从下面或上面的地层中收集。
Three radiometric methods have been used to date Quaternary tephra: fission-track (F-T), K-Ar, and radiocarbon (C-14). The fission-track and K~Ar methods provide direct ages for the tephra because they date phenocrysts from the source magma that were deposited by the eruption cloud. Radiocarbon dating provides only indirect ages because the carbon used in this method comes from material, such as pre-existing wood, included in the tephra during deposition or collected from underlying or overlying strata.