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黔西织纳煤田上二叠统层序地层及聚煤作用*

DOI: 10.7605/gdlxb.2011.05.003, PP. 493-500

Keywords: 织纳煤田,上二叠统,层序地层,聚煤作用

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Abstract:

贵州西部织(织金)纳(纳雍)煤田以发育海陆过渡相含煤岩系而成为研究西南地区晚二叠世沉积相及层序地层的理想地区。作者对该煤田上二叠统含煤岩系(龙潭组和长兴组)进行了高分辨率层序地层分析,并探讨了层序地层格架下煤层厚度的变化规律。以区域不整合面以及下切谷砂体底部冲刷面等为层序界面,结合石灰岩标志层向古陆方向延伸距离而显示的旋回性特征,将该煤田上二叠统含煤岩系划分为3个三级层序。其中层序Ⅲ中煤层最厚,层序Ⅰ中煤层最薄;同一个层序中,又以海侵体系域煤层最厚,低位体系域煤层最薄。在建立黔西织纳煤田层序地层格架的基础上,指出厚煤层主要发育于海侵体系域的三角洲平原环境。

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