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• W2185559436 abstract "This paper aims at bringing together and commenting on the scattered published and other data relating to the topic under review and highlighting that which still remains to be done before a' really comprehensive treatment of the subject can be attempted. At the outset it is stressed that many of the problems relating to the geneses of some of the material described have not been solved because, of necessity, a considerable proportion ofthe samples examined were obtained from secondary sources, such as beneficiation plants. The foUowing authigenic species are discussed:- pyrite, marcasite, sphalerite, galena, copper-bearing sulphides, siderite and native copper. Au­ thigenic iron oxides, 'chlorite', calcite, silica and phosphates have been passed over, largely because they have not yet been sufficiently researched, although they are aU known to occur in the alluvial deposits in question. AU the sulphides discussed in this paper were generated in swamps, some of which may weU have been of the fresh-water type, during early diagenesis. At Lenggang, Belitung, where aU the sulphides occur, the paragenesis is pyrite and marcasite, sphalerite, galena, copper-bearing sulphides. In the Southeast Asian stanniferous aUuvials both pyrite and marcasite are very common. Both species occur in organic-rich deposits as individual crystals of a variety of habits, but pyrite crystals are by far the more abundant. Marcasite, however, is usually the dominant species replacing and/or occupying ceUs in fossil plant material, and then pyrite framboids are often included in it. At Lenggang, galena rims voids in marcasite replaced wood. Slabs of pyrite and of marcasite, both with included framboids, have been found on the bedrock of some opencast mines, as have sandstones and conglomerates cemented by one or both of the sulphides. Not surprisingly, framboids and polyframboids are commonly found in organic-rich deposits but, in addition, framboids have been located in voids of blocks of primary ore lying on the bedrock, in a supergene coUoform chalcopyrite coating of a lode, in siderite dripstone, and as a late component within the hard-rock ore ofSungai Gob where, possibly, it is of hypogene origin. In the mill at Ayer Hitam Tin Dredging Property, Malaysia, an ornamented polyframboid was found whose ornamentation may have developed in the mill." @default.
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• W2185559436 date "1986-01-01" @default.
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• W2185559436 title "A review of what is presently known about the nature, distribution and genesis of certain authigenic minerals in the stanniferous alluvial deposits of Southeast Asia" @default.
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