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红土碎屑
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     The Change Properties of the Chemical Compositions for Laterite
     红土化学成分的变化特征
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     THE RED EARTH PERIODS IN CHINA
     中国的红土
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     4, sedimentary clastic rock;
     4.沉积碎屑岩;
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     CLASSIFICATION OF MARINE CLASTIC SEDIMENTS
     海洋碎屑沉积物的分类
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There are now two quite different opinions of the origin of palaeozoic bauxite in China : sedimentary hypothesis and ancient weathered crust hypothesis. The point at issue is textures and structures of bauxite ores and whether the mineral composition is weathering or sedimentary in water body , In the writer' s opinion , the textures and structures of palaeozoic bauxite ores and the mineral compositions are of the formation features of laterite slacking, rather than the formation features in water body or the...

There are now two quite different opinions of the origin of palaeozoic bauxite in China : sedimentary hypothesis and ancient weathered crust hypothesis. The point at issue is textures and structures of bauxite ores and whether the mineral composition is weathering or sedimentary in water body , In the writer' s opinion , the textures and structures of palaeozoic bauxite ores and the mineral compositions are of the formation features of laterite slacking, rather than the formation features in water body or the formation features of mechanic claste sedimentation, but identical with the textures, structures, mineral assemblages, isotopic compositions of laterite bauxite formed under the action of modern weathering , belonging to ancient weathered crust bauxite matter. Therefore, the writer suggests that this kind of bauxite be named ancient weathered crust bauxite deposit or ancient laterite bauxite deposit and the names of the bauxite ore textures and structures be added"lateritic" , such as lateritic pisolite, lateritic oolite, lateritic concretion, lateritic nodular, lateritic claste and lateritic boulder, so as to be differentiated from the bauxite formed in water body or in mechanic claste sedimentation.

我国古生代铝土矿矿石的结构、构造及矿物组成均具有红土化风化作用形成的特点,与水体中形成的或机械碎屑沉积的完全不同,它是古风化壳铝土物质,与现代风化作用形成的红土铝土矿矿石的结构、构造、矿物组合、同位素组成等均相同,都不是水体中形成的或机械碎屑沉积。因此作者建议将这种铝土矿命名为古风化壳铝土矿为宜。这类矿石的结构、构造命名为红土豆、红土鲕、红土结核、红土结石、红土碎屑、红土碎块等,使之更具成因意义。

The worldwide bauxites are almost found to be formed through weathering in thegeographically and topographically suitable marine climate envrionment roughly between 23 degree ofnorth latitude and 25 degree of south latitude. As a result, the ore deposits are always characterizedby such lateritic textures as pisolites, colites, nodules, fragments, and breccias as well and are wellknown collectively as weathering crust deposits or latentic deposits. Usually, their subdivision amongthis group varies with the initial...

The worldwide bauxites are almost found to be formed through weathering in thegeographically and topographically suitable marine climate envrionment roughly between 23 degree ofnorth latitude and 25 degree of south latitude. As a result, the ore deposits are always characterizedby such lateritic textures as pisolites, colites, nodules, fragments, and breccias as well and are wellknown collectively as weathering crust deposits or latentic deposits. Usually, their subdivision amongthis group varies with the initial transportation and emplacement prior to suffering from weathering.

全球铝土矿都是在南北纬23°~25°以内(热带、亚热带)在适宜的地理、地形的海洋气候条件下,由风化作用形成的。为此其矿石结构、构造都是风化作用形成的红土豆、红土鲕、红土结核、红土碎屑、红土砾块,无一例外,统称为风化壳(红土)铝土物质构成。它们迁移就位以后便形成风化壳铝土矿床(红土铝土矿床)。其迁移就位不同便形成不同的亚型红土铝土矿床。在第四纪以前的红土(风化壳)铝土矿床深埋地下,再随地壳上升迁移到地表或地壳浅部,经过酸性地下水将其中硅质溶解淋失,便形成多孔隙的土状、半土状富矿的古风化壳铝土矿床。其亚型的划分与红土铝矿矿床的亚型相同。

 
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