Detrital zircon geochronology of sandstones of the 3.6-3.2 Ga Barberton greenstone belt: No evidence for older continental crust
Detrital zircon geochronology of sandstones of the 3.6-3.2 Ga Barberton greenstone belt: No evidence for older continental crust
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DOI：
10.1130/g39255.1
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发表时间：
2017-09
期刊：
影响因子：
5.8
通讯作者：
N. Drabon;D. Lowe;G. Byerly;J. Harrington
中科院分区：
文献类型：
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作者：
N. Drabon;D. Lowe;G. Byerly;J. Harrington
亚利桑那大学激光计时中心(ALC)的分析方法斯坦福大学采用标准粒度、流体力学和密度矿物分离技术从2-10公斤砂岩样品中提取锆石年龄。对于北部、南部和中西部区域的球状层状和碎屑状锆石的U-Pb分析，在Frantz矿物分离过程中只排除了最大的磁性部分(0.4 MAG)，以避免偏差。来自东部-中心磁区的碎屑样品在1.2 MAG时被磁分离。然后将样品手工挑选到1英寸环氧基座上，并与ALC的斯里兰卡、FC-1、R33和OG1标准一起进行抛光。
Analytical Methods for University of Arizona LaserChron Center (ALC) LA-ICP-MS zircon dating Zircons were extracted from 2-10kg sandstone samples using standard size, hydrodynamic and density mineral separation techniques at Stanford University. For U-Pb analysis of spherule bed and detrital zircons in the Northern, Southern, and West-Central Domain only the most magnetic fraction (0.4 MAG) was excluded during Frantz mineral separation to avoid bias. Detrital samples from the East-Central Domain were magnetically separated at 1.2 MAG. Samples were then hand-picked onto 1” epoxy mounts together with ALC’s Sri Lanka, FC-1, R33 and OG1 standards and then polished.