黔北及邻区上二叠统底部高岭土矿床地质特征及成因

广泛产于黔北地区的高岭土矿在地理分布上与川南一带的叙永式高岭土矿是连续的(图1),其矿床地质特征也颇相似。该类矿床最早在四川见有报导、开采和利用。1982年关铁麟同志据该矿床地质特征认定其为古风化壳残余矿床,并命名为叙永式高岭土矿床。我队曾在黔北及川南叙永一带开展区调工作,在搜集前人有关资料的基础上,开展了部分普查找矿工作后,据其特征将矿床成因划为风化淋积矿床。

Geological Characteristics And Origin Of Kaolin Deposits At The Bottom Of Upper Permian In Northern Guizhou And Its Adjacent Areas

he kaolin ores occurring extensively in northern Guizhou are connected with Xuyong type kaolin ores of southern Sichuan in geographical distribution, with very similar geological characteristics. These ore deposits can therefore be studied and discussed as a whole. While describing the characteristics of the kaolin deposits at the bottom of Upper Permian in northern Guizhou, this paper presents an opinion different from the theories established by previous researchers for the origin of Xuyong type kaolin ore deposits. The previous researchers thought that Xuyong type of kaolin has been the product of Early Permian fossil weathering crust and that the materials came from the limestone of upper Maokou Formation of lower Permian. They also named such type of deposits. Nevertheless, based on the facts that the kaolin deposits are identical with the overlying pyrite-bearing clay rocks in distribution, that quite a lot of lump and massive ores occur in overlying kaolin-clay rocks although the main orebodies are in fossil karst surface of Maokou limestone, and that these orebodies exist in near-surface part, the authors consider that, instead of being the product of Early Permian fossil weathering crust, this sort of deposits seem to be recent weathering and leaching type kaolin deposits formed through transformation of kaolin minerals deposited simiultaneously with Late Permian coal bed into glagerite minerals.