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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >A report on the occurrence of intertrappean beds in an abandoned cave at Bhaja, Pune District, Maharashtra
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A report on the occurrence of intertrappean beds in an abandoned cave at Bhaja, Pune District, Maharashtra

机译：关于马哈拉施特拉邦浦那巴哈一个废弃洞穴中层间床发生的报告

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摘要

A study was carried out in one of the abandoned caves at Bhaja, Pune District, Maharashtra (Figure 1). In this abandoned cave, a partially consolidated, brownish-grey, parallel-laminated clayey sequence having a thickness of around 1 m and lateral extent of more than 4 m is found to occur between two massive, amygdaloidal basalt flows (Figure 2 a). Hand specimen reveals compact, fine, clay-rich laminations alternating with coarse granule, sandy and silty layers. The upper portions of the parallel-laminated, clayey sequence exhibit highly compressed, baked, undulating, broken and distorted laminations due to the heat and overloading pressure of the younger lava flows. The top of this clayey sequence also exhibits the development of mud cracks. The occurrence of highlyfragmented carbonized remains of plant material is commonly observed. Microscopic examination of the thin section shows a dominant mode of dark coloured, fine-grained clayey matter. Within this clayey matter, rounded to well-rounded detrital fragments of basalt are frequently observed. In addition, altered mineral grains of olivine, pyroxene and magnetite and the occurrence of secondary minerals like zeolites are also observed. Vitric materials, which are relics of volcanic glass, are commonly seen as rounded to sub-rounded yellowish-brown, altered fragments (Figure 2 b). At places, relatively fresh, vesicular, rounded fragments of glass shards (black in colour) are also observed. These characteristics clearly suggest the occurrence of an intertrappean horizon at one of the abandoned caves at Bhaja.
机译：在马哈拉施特拉邦浦那区巴贾的一个废弃洞穴中进行了一项研究（图1）。在这个废弃的洞穴中，发现在两个块状杏仁状玄武岩流之间出现了部分固结的棕灰色平行层状粘土序列，其厚度约为1 m，横向范围大于4 m（图2a）。手工样本显示出致密，细腻，富含粘土的层状结构，以及粗颗粒，沙质和粉质层。由于较年轻的熔岩流的热量和超负荷压力，平行层压的黏土层序的上部表现出高度压缩，烘烤，起伏，破碎和变形的层压。该粘土序列的顶部还显示出泥裂的发展。通常观察到植物材料高度碎片化的碳化残留物的发生。薄层的显微镜检查显示出深色，细粒黏土物质的主要模式。在这种粘土质物质中，经常观察到四舍五入成圆形的玄武岩碎屑碎片。此外，还观察到橄榄石，辉石和磁铁矿的矿物晶粒发生了变化，并出现了诸如沸石的次生矿物。玻璃质材料是火山玻璃的遗迹，通常被认为是四舍五入为亚圆形的黄褐色，改变的碎片（图2b）。在某些地方，还观察到较新鲜的囊状圆形碎片（黑色）。这些特征清楚地表明在Bhaja的一个被遗弃的洞穴中出现了一个跨界地平线。

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