Biotite as a petrogenetic discriminator: Chemical insights from igneous, meta-igneous and meta-sedimentary rocks in Iran
Biotite as a petrogenetic discriminator: Chemical insights from igneous, meta-igneous and meta-sedimentary rocks in Iran
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黑云母作为成岩鉴别器：来自伊朗火成岩、变火成岩和变沉积岩的化学见解
DOI：
10.1016/j.lithos.2021.106016
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发表时间：
2021
期刊：
影响因子：
3.5
通讯作者：
Miller Nathaniel R.
中科院分区：
文献类型：
--
作者：
Samadi Ramin;Torabi Ghodrat;Kawabata Hiroshi;Miller Nathaniel R.
铁镁黑云母的化学成分已被用来了解变质岩和火成岩的岩石成因。然而，黑云母受到亚固相线热液蚀变、变质作用以及与其他常见共存相（如石榴石和白云母）的化学交换的影响。因此，使用黑云母成分解释火成岩和变质过程并不总是简单的。在这里，我们比较黑云母组合物的火成岩，变火成岩，变沉积岩的地方在东北部（Dehnow，Khalaj，Khajeh Morad）和中部（Jandaq和Airekan）伊朗，类似的岩石类型在全球GEOROC数据库和其他地方，以约束相关的岩石成因分类方案。我们发现重要的成分对比黑云母与白云母和/或石榴石（在火成岩和变质岩），建议小心使用常见的歧视计划。例如，与石榴石和/或白云母有关的岩浆黑云母（即，Bt + Ms、Bt + Ms + Grt、Bt + Grt）通常富含Al而贫Fe、Mg和Ti，这可能是由于在白云母之前结晶但与石榴石结晶同步或之后结晶。变质黑云母中的石榴石和/或白云母轴承岩石往往富含钛，铁，镁和贫铝。岩浆和变质黑云母的对比成分行为也提出了问题，石榴石黑云母，黑云母白云母，钛黑云母温度计。我们的分析表明，黑云母的稀土和微量元素的浓度强烈影响共存的石榴子石和白云母。当岩浆黑云母与白云母、石榴子石发生结晶作用时，重稀土元素含量分别降低和升高。
Chemical compositions of Fe-Mg biotite have been used to understand the petrogenesis of metamorphic and igneous rocks. However, biotite is affected by sub-solidus hydrothermal alteration, metamorphism, and chemical exchange with other common coexisting phases such as garnet and muscovite. Therefore, the interpretation of igneous and metamorphic processes using biotite compositions is not always straightforward. Here we compare biotite compositions in igneous rocks, meta-igneous rocks, and meta-sedimentary rocks from localities in northeast (Dehnow, Khalaj, Khajeh Morad) and central (Jandaq and Airekan) Iran, with similar rock types in the global GEOROC database and from other localities, in order to constrain associated petrogenetic classification schemes. We find important compositional contrasts in biotite associated with muscovite and/or garnet (in both igneous and metamorphic rocks), suggesting careful use of common discrimination schemes. For example, magmatic biotite associated with garnet and/or muscovite (i.e., Bt + Ms, Bt + Ms + Grt, Bt + Grt) is often enriched in Al and depleted in Fe, Mg, and Ti, likely due to crystallization prior to muscovite but synchronous with or following garnet crystallization. Metamorphic biotites in garnet- and/or muscovite-bearing rocks tend to be enriched in Ti, Fe, and Mg and depleted in Al. The contrasting compositional behavior of magmatic and metamorphic biotites also poses problems for garnet-biotite, biotite-muscovite, and Ti-in-biotite thermometers. Our analysis indicates that biotite rare earth and trace element concentrations are strongly influenced by co-existing garnet and muscovite. When magmatic biotite crystallization occurs with muscovite and garnet, HREE concentrations respectively decrease and increase.
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影响因子：
3.1
作者：
Whitney, Donna L.;Evans, Bernard W.
通讯作者：
Evans, Bernard W.
岩浆岩和变质岩中的云母
DOI：
10.1007/bf02652613
发表时间：
1964
期刊：
--
影响因子：
--
作者：
J. Rimšaite
通讯作者：
J. Rimšaite
石榴石-黑云母地温计综述：其版本、准确度和精确度的固有问题以及进一步研究的前景
DOI：
10.1007/bf02876245
发表时间：
1999
期刊：
Chinese Journal of Geochemistry
影响因子：
--
作者：
Wu Chunming;Pan Yusheng
通讯作者：
Pan Yusheng
云母蚀变过程中氧同位素的变化
影响因子：
2.2
作者：
S. Komarneni;M. Jackson;D. Cole
通讯作者：
D. Cole
影响因子：
5.3
作者：
E. Bell;P. Boehnke;T. M. Harrison
通讯作者：
E. Bell;P. Boehnke;T. M. Harrison