In this study, we present the first systematic dataset on natural variations of OH defect and trace element contents in quartz within igneous bodies. Samples were derived from bore holes of two plutonic bodies from the Krušné Hory/Erzgebirge (German–Czech border), representing typical A-type (Cínovec/Zinnwald granite cupola) and S-type (Podlesí Stock) granite intrusions. Fourier Transform Infrared spectroscopy of quartz was used to investigate the sample set with regard to its OH defect speciation and content. For Zinnwald quartz, IR absorption spectra reveal different lithologies due to changes of the OH defect inventory, enabling a subdivision of the granitic body: (1) hydrothermal greisen quartz of the uppermost part of the intrusion have low OH defect contents (average of 15 µg/g H 2 O); (2) zinnwaldite granite quartz vary strongly in defect content and show the highest content of the dataset (10–70 µg/g H 2 O); (3) quartz from an underlying biotite granite have slightly lower, but very uniform contents down to the bottom of the borehole at 1600 m (average 20 µg/g H 2 O). Infrared spectra of Podlesí quartz reveal a gradual increase in total defect water content with increasing depth over 350 m (30–55 µg/g H 2 O). Lithium contents in quartz samples from the uppermost part of the Zinnwald intrusion correlate with the occurrence of Li-specific OH defects, while cathodoluminescence (CL) images do not show specific differences. Our findings evidence the potential of OH defects in quartz as a tool to decipher differentiation trends in igneous bodies, and the application of their eroded material for provenance analyses.

中文翻译：

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火成岩体内天然石英中OH缺陷和化学杂质的变化

在这项研究中，我们提出了第一个关于火成体中石英中 OH 缺陷和微量元素含量自然变化的系统数据集。样品来自 Krušné Hory/Erzgebirge（德国-捷克边界）的两个深成岩体的钻孔，代表典型的 A 型（Cínovec/Zinnwald 花岗岩冲天炉）和 S 型（Podlesí Stock）花岗岩侵入体。石英的傅立叶变换红外光谱用于研究样品组的 OH 缺陷形态和含量。对于 Zinnwald 石英，由于 OH 缺陷存量的变化，IR 吸收光谱揭示了不同的岩性，从而能够细分花岗岩体：(1) 侵入体最上部的热液灰石英具有低 OH 缺陷含量（平均 15 µg /g H 2 O); (2) zinnwaldite 花岗岩石英的缺陷含量变化很大，并显示数据集的最高含量（10-70 µg/g H 2 O）；(3) 来自下方黑云母花岗岩的石英含量略低，但在 1600 m 处直至钻孔底部的含量非常均匀（平均 20 µg/g H 2 O）。Podlesí 石英的红外光谱显示总缺陷水含量随着深度超过 350 m (30–55 µg/g H 2 O) 的增加而逐渐增加。来自 Zinnwald 侵入体最上部的石英样品中的锂含量与锂特定的 OH 缺陷的发生相关，而阴极发光 (CL) 图像没有显示出特定的差异。我们的研究结果证明了石英中 OH 缺陷作为破译火成体分化趋势的工具的潜力，以及其侵蚀材料在来源分析中的应用。