Soil-Saprolite Profiles Derived from Mafic Rocks in the North Carolina Piedmont: I. Chemical, Morphological, and Mineralogical Characteristics and Transformations
Soil-Saprolite Profiles Derived from Mafic Rocks in the North Carolina Piedmont: I. Chemical, Morphological, and Mineralogical Characteristics and Transformations
复制标题
北卡罗来纳州山前镁铁质岩石的土壤腐泥土剖面：I. 化学、形态和矿物学特征及转化
DOI：
--
复制
发表时间：
1985
期刊：
影响因子：
--
通讯作者：
S. B. Weed
中科院分区：
文献类型：
--
作者：
T. Rice;S. Buol;S. B. Weed
本文对辉长岩和变辉长岩上形成的两个埃农桑迪壤土（细、混合、热Ultic Hapudalfs）土壤腐岩剖面的化学、形态和矿物学性质进行了比较。在这些土壤的粘质层中，粘土皮是罕见的，而应力剪切是常见的。铁锰结核集中在粘土层之上的土壤层中。粘土层的高收缩-膨胀能力和缓慢的渗透性导致与腐泥土接触的副石深度相对较浅。北卡罗来纳州斯坦利县Albemarle附近的埃农剖面的母岩是一种中等粒度的变辉长岩，主要原生矿物为方解石、角闪石、石英和含钙斜长石。绿泥石风化成规则间层的绿泥石-蛭石，再转化成随机间层的绿泥石-蛭石和蒙皂石。粒度随矿物蚀变而减小。角闪石风化为蒙皂石和针铁矿。在腐泥土和土壤层中，钙质斜长石转变为高岭石。石英相对耐化学风化。埃农剖面1的母岩，罗利，NC 27650，北卡罗来纳州研究期刊系列服务的第9108号论文。在Div之前提交。S-9，土壤科学Soc. of Am.，底特律，密歇根州，1980年12月2日。1984年2月23日收到。1984年8月11日核准。2前研究生研究助理和土壤科学教授，分别，副。北卡罗来纳州州立大学土壤科学系，罗利，NC 27650。资深作者现为土壤科学系助理教授，加州州立理工大学，San Luis Obispo，CA 93407.位于北卡罗来纳州卡巴鲁斯县康科德附近的一个辉长岩是一种粗粒辉长岩，主要原生矿物为角闪石和钙质斜长石。角闪石转变为蒙皂石和针铁矿。腐岩中钙斜长石向高岭石转变
The chemical, morphological and mineralogical properties of two Enon sandy loam (fine, mixed, thermic Ultic Hapludalfs) soilsaprolite profiles, one formed on gabbro and the other on metagabbro, are compared. Clay skins are scarce and stress cutans common in the argillic horizons of these soils. Iron-manganese concretions are concentrated in soil horizons immediately above the argillic horizons. The high shrink-swell capacities and slow permeabilities of the argillic horizons result in relatively shallow depths to paralithic contact with saprolite. The parent rock from the Enon profile near Albemarle, Stanly County, North Carolina is a medium-grained metagabbro with chlorite, hornblende, quartz, and calcic plagioclase feldspar as the dominant primary minerals. Chlorite weathers to regularly interstratified chlorite-vermiculite, which alters to randomly interstratified chlorite-vermiculite and smectite. Particle size decreases with each mineral alteration. Hornblende weathers to smectite and goethite. Calcic plagioclase feldspar transforms to kaolinite in the saprolite and soil horizons. Quartz is relatively resistant to chemical weathering. The parent rock of the Enon profile 1 Paper no. 9108 of the North Carolina Research Journal Series Service, Raleigh, NC 27650. Presented before Div. S-9, Soil Sci. Soc. of Am., Detroit, MI, 2 Dec. 1980. Received 23 Feb. 1984. Approved 11 Aug. 1984. 2 Former Graduate Research Assistant and Professors of Soil Science, respectively, Dep. Soil Science, North Carolina State Univ., Raleigh, NC 27650. The senior author is now Assistant Professor, Soil Science Dep., Calif. Polytechnic State Univ., San Luis Obispo, CA 93407. near Concord, Cabarrus County, North Carolina is a coarse-grained gabbro with hornblende and calcic plagioclase feldspar as the dominant primary minerals. Hornblende transforms to smectite and goethite. Calcic plagioclase feldspar alters to kaolinite in the saprolite