Identification and origins of iron sulfides in Czech Loess
Identification and origins of iron sulfides in Czech Loess
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DOI：
10.1029/2001gl013108
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发表时间：
2001-10
影响因子：
5.2
通讯作者：
C. Shi;R. Zhu;V. Suchý;A. Zeman;B. Guo;Y. Pan
中科院分区：
文献类型：
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作者：
C. Shi;R. Zhu;V. Suchý;A. Zeman;B. Guo;Y. Pan
采用多种岩石磁性和非磁性技术来识别晚更新世捷克黄土沉积物中的铁硫化物。结果表明，Znojmo剖面黄土中的铁硫化物主要为磁黄铁矿和黄铁矿，化学计量范围为Fe 10 S11 ~ FeS 2。虽然不能排除早期成土成因的细硫化物部分，扫描电子显微镜（SEM）的单个颗粒和磁性提取物的显微镜观察表明，铁硫化物颗粒可能是碎屑的起源。这些硫化物的潜在来源可能是剖面附近假设矿床上方的残积壤土或附近冰川边缘的冰川冲积沉积物。Framboidal黄铁矿的形式，现在完全取代铁氧化物，表明一些颗粒的生物成因的硫化物也可能被运送到黄土从假定的河流沉积物。
Multiple rock‐magnetic and non‐magnetic techniques were employed to identify iron sulfides in late Pleistocene Czech loess deposits. The results indicate that iron sulfides in the loess at Znojmo section are mainly pyrrhotite and pyrite, with stoichiometry ranging from Fe10S11 to FeS2. Although early pedogenic origin of fine sulfide fraction can not be ruled out, scanning electron microscopy (SEM) of individual grains and microscopic observations of magnetic extracts show that iron sulfide grains are probably of detrital origin. Potential sources of these sulfides may have been eluvium loams above hypothetical ore deposits in the vicinity of the section or glacifluvial sediments from nearby glacial margins. Framboidal pyrite forms, now completely replaced by iron oxides, suggest that some particles of biogenic sulfides may have also been transported into loess from presumably fluvial sediments.