Palaeocurrent dispersal patterns of Witwatersrand gold placers
Palaeocurrent dispersal patterns of Witwatersrand gold placers
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威特沃特斯兰德金砂矿的古水流扩散模式
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
J. Loen
中科院分区：
文献类型：
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作者：
W. Minter;J. Loen
在威特沃特斯兰德盆地的砂矿分散模式已经建立了从现有的古倾斜指标，包括地层分离的等厚线之间的标记和覆盖的不整合，他们subcrop，等值线的碎屑大小，碎屑重矿物粒度和矿物比，palaeochannal趋势，和5622交错层理矢量。单峰槽交错层理数据（矢量方差一般小于3000）、碎屑大小和组合信息使我们能够确定砂矿的分布，砂矿被认为代表了广泛的辫状三角洲上的聚结叶，这些辫状三角洲垂直于矿床的边缘延伸，覆盖面积达100平方公里以上
Placer dispersal patterns in the Witwatersrand Basin have been established from available palaeodip indicators comprising isopachs of stratigraphic separations between markers and overlying unconformities against which they subcrop, isopleths of clast size, detrital heavy mineral grain size and mineral ratios, palaeochannel trends, and 5622 cross-bedding vectors. Unimodal trough cross-bedding data (with vector variances generally less than 3000), clast size, and assemblage information, have enabled us to define the distribution of placer deposits, which are considered to represent coalescing lobes on extensive braid deltas that spread out perpendicular to the margins of the depositories to cover areas of 100 km 2 and more