Kl Ar ages from the Basal Gneiss Region, Stadlandet area, Western Norway
Kl Ar ages from the Basal Gneiss Region, Stadlandet area, Western Norway
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Kl Ar 年龄来自挪威西部 Stadlandet 地区的基底片麻岩地区
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
D. Lux
中科院分区：
文献类型：
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作者：
D. Lux;D. Lux
挪威Stadlandet地区矿物的K1 Ar和40 ArP 9Ar年代学由于许多样品中存在过量的40 Ar而变得复杂。Re是过剩40 Ar浓度与样品织构产状之间的相关性。角闪石和云母密切相关的榴辉岩豆荚可能含有显着浓度的过剩40 Ar，而从围岩的样品没有。围岩角闪石的K1 Ar和40 ArP 9Ar年龄表明，变质后冷却温度超过500°C，发生在榴辉岩形成后不久，约410 Ma前。不含过量~（40）Ar的黑云母约在370 Ma前冷却至300°C。可以推断变质后冷却速率约为5°C/Ma。
KlAr and 40ArP9Ar geochronology of minerals from the Stadlandet region, Norway, is complicated by the presence of excess 40 Ar in man y samples. The re is a correlation between excess 40 Ar concentration and textural occurrence of samples. Amphiboles and micas closely associated with eclogite pods are likely to contain significant concentrations of excess 40 Ar while samples from the country rocks are not. Kl Ar and 40 ArP9 Ar ages for horn blende from the country rocks suggest that post-metamorphic cooling through 500°C occurred about 410 Ma ago, shortly after eclogite formation. Biotites containing no excess 40Ar cooled through 300°C about 370 Ma ago. A post-metamorphic cooling rate of about 5°C/Ma can be inferred.