

地学前缘 ›› 2026, Vol. 33 ›› Issue (2): 76-87.DOI: 10.13745/j.esf.sf.2025.1.40
滕卓尔1,2(
), 李珊珊1,2,*(
), 高子越1, 王洁1, 李康宁2, 侯朝宗1, 黄昊翀1, 郑志远1
收稿日期:2025-06-02
修回日期:2025-11-15
出版日期:2026-03-25
发布日期:2026-01-29
通信作者:
李珊珊(1991—),女,高级实验师,博士生导师,主要从事矿床地球化学研究。E-mail: 作者简介:滕卓尔(2002—),男,博士,地质学专业。E-mail: zhuoerteng@qq.com
基金资助:
TENG Zhuoer1,2(
), LI Shanshan1,2,*(
), GAO Ziyue1, WANG Jie1, LI Kangning2, HOU Chaozong1, HUANG Haochong1, ZHENG Zhiyuan1
Received:2025-06-02
Revised:2025-11-15
Online:2026-03-25
Published:2026-01-29
摘要:
西秦岭造山型金矿成矿流体主要来源于区域地层中含水矿物在进变质作用过程中的脱水反应。尽管X射线衍射、傅里叶变换红外光谱和拉曼光谱等常规方法已被广泛应用于含水矿物的识别,但由于对氢元素敏感性较低、水相关信号干扰显著以及荧光效应的影响,这些方法在精确鉴定含水矿物类型和定量分析岩石水含量方面仍存在明显局限。太赫兹时域光谱(terahertz time-domain spectroscopy,THz-TDS)技术作为一种非破坏性光谱分析手段,对水分子集体振动模式及矿物晶格中水的赋存状态高度敏感,为岩石中含水矿物的有效识别与表征提供了新的技术途径。本研究以西秦岭造山带甘南地区三叠纪地层为研究对象,综合岩相学观察与太赫兹时域光谱分析,识别地层中的含水矿物并分析其含水特性,进而约束不同岩性的地层在进变质过程中发生脱水反应的潜力。结果表明,三叠纪地层中的绢云母、黑云母、绿泥石和褐铁矿等含水矿物表现出明显的太赫兹吸收特征,其中含分子水的褐铁矿呈现最显著的吸收特征峰。以绿泥石为主要含水矿物的砂岩显示出较高的太赫兹吸收系数与折射率,反映其具较高的含水量,表明该类岩石在进变质过程中能够通过脱水反应提供主要的成矿流体。本研究证实太赫兹时域光谱技术在沉积岩含水特性及含水矿物表征中具有良好的应用,为示踪造山型金矿成矿流体来源提供了新的技术方法。
中图分类号:
滕卓尔, 李珊珊, 高子越, 王洁, 李康宁, 侯朝宗, 黄昊翀, 郑志远. 基于太赫兹时域光谱的沉积岩含水性分析:以西秦岭造山型金矿三叠系赋矿围岩为例[J]. 地学前缘, 2026, 33(2): 76-87.
TENG Zhuoer, LI Shanshan, GAO Ziyue, WANG Jie, LI Kangning, HOU Chaozong, HUANG Haochong, ZHENG Zhiyuan. Analysis of water content in sedimentary rocks using terahertz time-domain spectroscopy: A case study from the Triassic ore-hosting rocks in the West Qinling orogenic gold deposit[J]. Earth Science Frontiers, 2026, 33(2): 76-87.
| 样品编号 | 岩性 | 采样位置 | 分析样品厚度/mm | 主要矿物 |
|---|---|---|---|---|
| 23GN01 | 泥岩 | 102.71°E,34.96°N | 1.449 | 石英、绢云母、黑云母、黄铁矿、褐铁矿和黏土矿物 |
| 23GN20 | 泥岩 | 102.82°E,35.02°N | 0.923 | 石英、绢云母、黑云母、黄铁矿、褐铁矿和黏土矿物 |
| 23GN06 | 砾岩 | 102.79°E,35.00°N | 0.826 | 石英、绢云母、长石、方解石、黄铁矿、褐铁矿和黏土矿物 |
| 23GN10 | 砾岩 | 102.79°E,35.00°N | 1.247 | 石英、绢云母、方解石、绿泥石、黄铁矿、褐铁矿和黏土矿物 |
| 23GN13 | 砂岩 | 102.31°E,34.96°N | 1.269 | 石英、绢云母、绿泥石和黄铁矿 |
表1 测试样品采样位置、岩性和分析样品厚度
Table 1 The sampling location, lithology, and analytical thickness of test samples
| 样品编号 | 岩性 | 采样位置 | 分析样品厚度/mm | 主要矿物 |
|---|---|---|---|---|
| 23GN01 | 泥岩 | 102.71°E,34.96°N | 1.449 | 石英、绢云母、黑云母、黄铁矿、褐铁矿和黏土矿物 |
| 23GN20 | 泥岩 | 102.82°E,35.02°N | 0.923 | 石英、绢云母、黑云母、黄铁矿、褐铁矿和黏土矿物 |
| 23GN06 | 砾岩 | 102.79°E,35.00°N | 0.826 | 石英、绢云母、长石、方解石、黄铁矿、褐铁矿和黏土矿物 |
| 23GN10 | 砾岩 | 102.79°E,35.00°N | 1.247 | 石英、绢云母、方解石、绿泥石、黄铁矿、褐铁矿和黏土矿物 |
| 23GN13 | 砂岩 | 102.31°E,34.96°N | 1.269 | 石英、绢云母、绿泥石和黄铁矿 |
| 矿物名称 | 化学式 | 是否含水 | 水的赋存形式 |
|---|---|---|---|
| 石英 | SiO2 | 否 | |
| 绢云母 | KAl2(AlSi3O10)(OH)2 | 是 | 结构水 |
| 黑云母 | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 | 是 | 结构水 |
| 黄铁矿 | FeS2 | 否 | |
| 褐铁矿 | mFe2O3·nH2O | 是 | 分子水 |
| 长石 | (K/ Na/ Ca)(Al/ Si)4O8 | 否 | |
| 方解石 | CaCO3 | 否 | |
| 绿泥石 | (Fe2+/Fe3+/Mg/Al)6(Al/Si)4(O/OH)18 | 是 | 结构水 |
表2 测试样品主要矿物化学式及水的赋存形式
Table 2 Chemical formulas of major minerals and their water occurrence forms in test samples
| 矿物名称 | 化学式 | 是否含水 | 水的赋存形式 |
|---|---|---|---|
| 石英 | SiO2 | 否 | |
| 绢云母 | KAl2(AlSi3O10)(OH)2 | 是 | 结构水 |
| 黑云母 | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 | 是 | 结构水 |
| 黄铁矿 | FeS2 | 否 | |
| 褐铁矿 | mFe2O3·nH2O | 是 | 分子水 |
| 长石 | (K/ Na/ Ca)(Al/ Si)4O8 | 否 | |
| 方解石 | CaCO3 | 否 | |
| 绿泥石 | (Fe2+/Fe3+/Mg/Al)6(Al/Si)4(O/OH)18 | 是 | 结构水 |
图4 沉积岩样品手标本照片和显微照片 A—泥岩手标本照片;B—砾岩手标本照片;C—砂岩手标本照片;D—泥岩显微照片;E—砾岩显微照片;F—砂岩显微照片。Py—黄铁矿;Ser—绢云母;Qz—石英;Bt—黑云母、绢云母;Pl—斜长石;Chl—绿泥石。
Fig.4 Specimen and microphotographs of sedimentary rock samples
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