Quartz grain surfaces – A potential microarchive for sedimentation processes and parent material identification in soils of Jordan
Quartz grain surfaces – A potential microarchive for sedimentation processes and parent material identification in soils of Jordan
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石英颗粒表面 â 约旦土壤沉积过程和母质鉴定的潜在微档案
DOI：
10.1016/j.catena.2018.12.038
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发表时间：
2019
期刊：
影响因子：
6.2
通讯作者：
Kemnitz
中科院分区：
文献类型：
--
作者：
Kemnitz
利用扫描电镜微表面和分析方法，研究了约旦3个土壤剖面中>250 μm砂粒的石英和稀有长石颗粒。含岩石层的土壤具有不同的成熟度和不同的成岩蚀变作用，其基岩为砂岩、石灰岩和玄武岩。这些剖面是在该地区环境历史项目中调查的，而首次应用于约旦土壤的石英颗粒表面分析（QGSA）是补充研究的重要组成部分，该研究是在红色玄武岩土壤中发现不寻常的矿物成分时发起的，对其来源和土壤的历史提出了疑问。在早第三纪灰岩上重建的砂岩Regosol和地中海红土（RMS）的主要运移过程和环境，通过序列和颗粒形态特征的类型进行了记录，这些特征明显反映了不同的水动力学，部分与风成运动交替，这一结果与已知的基岩沉积历史相匹配，并支持石英颗粒表面分析（QGSA）的可靠性。早第四纪玄武岩中玄武岩土壤中外来石英颗粒群落的显微结构模式与石灰岩样品具有高度的相似性。玄武岩土壤中的部分石英颗粒与RMS剖面一样为燧石，这是石英来源的重要标志。石英存在的一个充分解释是，露头的始新世风化的乌姆里雅姆燧石石灰岩组，其中有燧石结核，被重新加工并运输到风化玄武岩的顶部。来自砂岩Regosol的长石颗粒与石英颗粒表现出整合模式，而来自红色玄武岩土壤的斜长石颗粒则相反，是烃源岩的主要矿物成分。这些保存下来的斜长石只表现出与年轻的非成岩基岩相对应的轻微的化学风化特征。颗粒的大小和玄武岩帽在景观中的位置，以及初步的年代测定表明，在更新世的某个时候，约旦经历了一段暴风雨时期。
Using SEM-supported microsurface and analytical methods we studied quartz and rare feldspar grains of the sand fraction >250 μm from three soil profiles in Jordan. The soils including a Lithosol are of different maturity and diagenetic alteration of their bed rocks, which are sandstone, limestone, and basalt. The profiles had been investigated during projects on the environmental history of the region, whereas the quartz grain surface analysis (QGSA) that has been applied for the first time to Jordan soils is an essential part of a supplementary study that was initiated when findings of unusual mineral components in a red basalt soil raised questions of their source and the history of this soil.The major transport processes and environments that were reconstructed for the sandstone Regosol and the Red Mediterranean Soil (RMS) on Early Tertiary limestone are documented by successions and types of grain-morphological features that apparently reflect varying water dynamics partly alternating with aeolian motion – a result, which matches with the known sedimentary history of their bedrocks and supports the reliability of the quartz grain surface analysis (QGSA). The microtexture pattern for the exotic quartz grain community in the basalt soil on an Early Quaternary basaltic rock showed a high similarity to those of the limestone samples. Part of the quartz grains from the basalt soil turned out to be chert as is present in the RMS profile and was an essential indication for the source of quartz. A sufficient explanation for the presence of quartz is that the outcropping, weathered Eocene Umm Rijam Chert Limestone Formation, among them chert nodules, was reworked and transported to the top of the weathering basalt. While a feldspar grain from the sandstone Regosol shows a conformable pattern to the quartz grains, plagioclase single grains from the red basalt soil, in contrast, are primary mineral components of the source rock. These preserved plagioclases exhibit only minor features of chemical weathering corresponding to the young, non-diagenetic bedrock. The size of the grains and situation of the basalt cap in the landscape, as well as preliminary dating suggest a period of heavy storms in Jordan at some time during the Pleistocene.
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影响因子：
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DOI：
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发表时间：
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期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
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作者：
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