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本文采集了海南岛南部吊罗山和尖峰岭花花岗上半风化体的两对垂直系列标本,利用x—衍射、TEM、SEM及偏光显微镜研究了花岗岩中长石的风化作用。用偏光显微镜鉴定了母岩的矿物成分,特别鉴定了长石成份,这些标本中的以钾长石为主,占40—50％,斜长石为次占20—35％,用TEM鉴定了<2μ粘粒纫中长石的次生粘土矿物的组成。发现该两地区普遍存在着埃洛石和高岭石。用SEM直接观察到了长石风化的过程,长石的风化分水介和次生两种作用,前者使长石溶蚀破坏,后者使长石与溶液作用形成新的粘土矿物,这两种作用在风化过程中是同时进行的。两山的长石溶蚀作用和次生产物是有差异的,尖峰岭
In this paper, two pairs of vertical series of granite upper semi-weathering bodies of Diaoluoshan and Jianfengling were collected from southern Hainan Island. The weathering of granite feldspar was studied by x-ray diffraction, TEM, SEM and polarizing microscope. Polarized microscope was used to identify the mineral composition of the parent rock, in particular the identification of feldspar ingredients, these specimens mainly to potassium feldspar, accounting for 40-50%, plagioclase accounted for 20-35%, identified by TEM Composition of secondary clay minerals of <2μ grit-feldspar. It is found that halloysite and kaolinite are common in these two areas. The weathering process of feldspar and the weathering and subaging of feldspar were observed directly by SEM. The former caused the dissolution of feldspar and the latter caused the feldspar to react with the solution to form new clay minerals. These two roles In the weathering process is carried out simultaneously. There are differences between feldspar dissolution and secondary products in two mountains, Jianfengling