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滇东黔西上二叠统含煤岩系泥岩粘土矿物组成及环境意义*

DOI: 10.7605/gdlxb.2008.03.009, PP. 297-304

Keywords: 滇东,黔西,粘土矿物,泥岩,含煤岩系,上二叠统,沉积环境

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Abstract:

滇东黔西上二叠统含煤岩系形成于陆相到海陆过渡相环境中,其泥岩的粘土矿物组成可以反映这种环境背景。该区泥岩粘土矿物类型以高岭石和伊利石/蒙皂石间层矿物为主,伊利石次之,局部层段见较少绿泥石及蒙皂石。垂向上,高岭石在富源后所矿区、盘县盘关矿区剖面中下部(即宣威组中、下段和龙潭组)含量偏高;伊利石在织金矿区剖面上部(长兴组)和下部(龙潭组下段)含量明显偏高,而在剖面中部(龙潭组上段)偏低;伊利石/蒙皂石间层矿物在后所矿区、盘关矿区、纳雍矿区占绝对优势,而在织金矿区仅在剖面中部含量较高,并与伊利石呈明显的负相关关系;蒙皂石含量很少,仅出现于盘关矿区和织金矿区剖面的上部和下部。粘土矿物的上述分布特征可大致反映出龙潭早期为海侵期,龙潭晚期为海退期,长兴期为新的更大的海侵期。平面上,从陆到海,即从滇东的冲积平原河流体系,向东经盘关向斜的上三角洲平原、纳雍的过渡带三角洲平原,到织金的下三角洲平原及潮汐平原,高岭石含量急剧减少,伊利石含量逐渐增加。最为明显的是从滇东河流体系到黔西三角洲—潮坪体系之间高岭石含量骤然减少。

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