Mineral Composition of Clay Fractions and Oxygen Vacancies in Silt-Sized Quartz in Soils on the Ka-Etsu Plateau, Fukui, Central Japan—Possibility of Eolian Dust Brought from Northern Asia as Parent Material of Soils
Mineral Composition of Clay Fractions and Oxygen Vacancies in Silt-Sized Quartz in Soils on the Ka-Etsu Plateau, Fukui, Central Japan—Possibility of Eolian Dust Brought from Northern Asia as Parent Material of Soils
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DOI：
10.1111/j.1747-0765.2005.tb00139.x
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发表时间：
2005-12
影响因子：
2
通讯作者：
Y. Kitagawa;H. Imoto;M. Saito;H. Kurihara;Kohtaro Fujie;S. Toyoda;T. Naruse
中科院分区：
文献类型：
--
作者：
Y. Kitagawa;H. Imoto;M. Saito;H. Kurihara;Kohtaro Fujie;S. Toyoda;T. Naruse
卡越高原早上新世岩石和更新世砂质沉积物中分布着细至中等质地的土壤。京高卡（JIN）土壤在形态上与黄褐色森林土壤相似，但经WRB划分为aluandosols和日本土壤学会第四次土壤分类与命名委员会划分为低腐殖质非allophanic Kuroboku土壤。另一方面，富光（TMI）和山室（YAM）土壤根据其形态、物理和化学性质被WRB划分为高染铬Cambisols，而第四届土壤分类和命名委员会将其划分为典型黄棕色森林土壤。这些土壤受赤叶菌的影响较大，特别是JIN土壤。根据粘土矿物学分析和细石英氧空缺相关的esr信号强度测量结果，Ka-Etsu高原土壤中大部分母质来源于末次盛冰期第2期（24 ~ 1.1万年前）亚洲大陆北部前寒武纪沉积物中随西北冬季季风带来的风成尘。在靠近岩石海岸线的最高阶地上，细小质地的晋土的母质主要由风沙组成，但也受到了赤热土的影响。TMI土的母质与少量来自迎风沙质海岸的原生物质混合。位于远离海岸线的丘陵地带一侧的YAM土中，细石英中的esr信号强度相当低，并且由于该土的质地比JIN和TMI土更粗糙，因此也考虑了土源物质的掺入。
Fine- to medium-textured soils are distributed on the Early Pliocene rocks and Pleistocene sandy sediments in the Ka-Etsu plateau. The Jingaoka (JIN) soil was classified into Aluandic Andosols by WRB, and Low-humic Non-allophanic Kuroboku soils by the Fourth Committee for Soil Classification and Nomenclature of the Japanese Society of Pedology, although it was similar morphologically to Yellow-Brown Forest soils. On the other hand, the Tomitsu (TMI) and Yamamuro (YAM) soils were classified into Hyperdystri-Chromic Cambisols by WRB, and Typic Yellow-Brown Forest soils by the Fourth Committee for Soil Classification and Nomenclature based on the morphological, physical and chemical properties. These soils were influenced considerably by the Akahoya tephra, especially the JIN soil. Based on the results of clay-mineralogical analysis and the measurement of the ESR-signal intensity associated with the oxygen vacancies in fine quartz, a large part of parent materials in the soils distributed on the Ka-Etsu plateau was derived from the eolian dust which was brought with the NW winter monsoon from the Precambrian sediments in the northern part of the Asian continent during MIS 2 (24–11 thousand years ago) at the Last Glacial Maximum. The parent materials of the fine-textured JIN soil located on the highest terrace near the rocky coastline were mostly composed of eolian dust, although the influenced of the Akahoya tephra was recognized. The parent materials of the TMI soil were admixed with a small amount of autochthonous materials from the sandy coast located windward. In the YAM soil which was located on the side of a hilly area distant from the coastline, the ESR-signal intensity in fine quartz was considerably low, and the admixture of autochthonous materials was also considered since the texture of this soil was coarser than that of the JIN and TMI soils.