贵州施秉下翁哨地区含铬镁铝榴石和镁铬尖晶石自然重砂,高度浓集于下翁哨盆地北岸对门坡一带新近系翁哨组含砾黏土和盆地南侧2 km处斜坡带"不明成因"砂砾石堆积物中,构成罕见高含量重砂异常,文中通过钾镁煌斑岩、金伯利岩和一般基性-超基性岩及榴辉岩等石榴子石含量特征的对比分析,尚难解释异常来源问题,甚至利用章人骏(1985)关于沅水流域金刚石及其伴生矿物分布的"古冰碛物次生源"观点,亦难解其来源和矿物组合问题,故此权称为谜,特撰文简述抛砖引玉以期共勉,尤籍此为贵州金刚石原生矿的找矿突破寻找指导.%The placer anomaly with high content of Chromium-bearing-pyrope and Magnesia-chrome-spinel in Xiawengshao area,Shibing County,Guizhou Province,It is distributed in the gravel—clay rock from the Neogene Wengshao Formation in Duimenpo area,north side of the Xiawengshao basin, and the"unexplained"deposits of sand—gravel in the slope zone,2 km south side of the Xiawengshao basin;such a phenomenon constitutes the high content of placer anomalies. By the comparison and analysis with characteristics of garnet in rocks such as lamproite,kimberlites and basic-ultrabasic rocks and eclogites, It's still hard to explain the source of the placer anomaly. Even using the viewpoint of Zhang Renjun(1985&)that the distribution of diamonds and associated minerals in the Yuanshui River is"the secondary glacial drift",it is also difficult to explain the source and mineral composition problems.This phenomenon is still an enigma. So,the purpose of this article is to provide guidance for making a breakthrough of primary diamond deposits in guizhou.
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