The derivation of 40Ar/39Ar age spectra of single grains of hornblende and biotite by laser step-heating
The derivation of 40Ar/39Ar age spectra of single grains of hornblende and biotite by laser step-heating
复制标题
激光步进加热角闪石和黑云母单晶40Ar/39Ar年龄谱的推导
DOI：
--
复制
发表时间：
1987
期刊：
影响因子：
--
通讯作者：
D. York
中科院分区：
文献类型：
--
作者：
P. Layer;C. Hall;D. York
我们展示了通过激光逐步加热单个颗粒而获得的角闪石和黑云母的 40Ar/39Ar 年龄光谱的第一个例子。通过这种方式，可以直接使用连续激光产生详细（>20 个步骤）、可重复且精确的年龄光谱。使用红外显微镜来监测样品温度变化，以便选择明智的加热方案。这样的系统可以很容易地实现自动化。显示的黑云母光谱显示，质量相差约 70 倍的共存薄片之间存在巨大的年龄差异（约 60 m.y.）。
We present the first examples of 40Ar/39Ar age spectra for hornblende and biotite derived by the laser step-heating of individual grains. It is straightforward to use a continuous laser to produce detailed (>20 steps), reproducible and precise age spectra in this way. An infra-red microscope is used to monitor the sample temperature changes so that a judicious heating schedule can be chosen. Such a system can be readily automated. The biotite spectra shown exhibit large age differences (∼60 m.y.) between co-existing flakes differing in mass by a factor of ∼70.