The study area Kadalundi estuary is fully occupied with mangroves, and conserved as a bird sanctuary. In this estuary, systematic studies on sedimentological and geochemical aspects are not done so far. Hence, an attempt has been made in this area to infer the paleoenvironmental significance in this region. A core of length 185 cm was taken and subsampled in 5 cm intervals. The sand-silt-clay analyses indicate higher concentration of sand in the core and overall low calcium carbonate content. The organic matter content is highly concentrated at the top and bottom core, whereas in the middle core it is slightly decreased. The sorting values depict poor sorting which indicates mixed environment condition.i.e, one derived from riverine/aeolian environment and the other derived from marine environment. This is due to the widely varying nature of sediments and change in gradients of the coastaline. The heavy mineral assemblage of the study area shows the distribution of low and high ranked metamorphic and some basic igneous rocks.The presence of a little amount of zircon in the top core implies the influence of marine inputs by reworked sediments. XRF data resembles a sudden rise in the concentration towards the bottom core suggests that the trace elements show a positive relation with silt, clay and organic matter in the sediments. XRD analysis projects the presence of Illite in all the samples suggesting the emergence of estuary into Arabian Sea and the reworking of waves. From the overall study it is concluded that the river discharge from Kadalundi, deposits an additional sub-population of sand with a mean size of sediments from medium to fine grained, where low-energy conditons prevails and accretionary processes are taking place with mixed environments.

中文翻译：

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地球化学，质地研究及其对喀拉拉邦卡达伦迪河口核心沉积物的环境影响

研究区Kadalundi河口已被红树林完全占据，并被保存为鸟类保护区。在这个河口，到目前为止还没有对沉积学和地球化学方面进行系统的研究。因此，已尝试在该区域推断该区域的古环境意义。取长185 cm的岩心，并以5 cm的间隔进行二次采样。砂-淤泥-粘土分析表明岩心中砂的浓度较高，而总体碳酸钙含量较低。有机质含量高度集中在顶核和底核，而在中核则略有下降。分类值表示分类不佳，表明混合环境条件，即一种来自河流/风沙环境，另一种来自海洋环境。这是由于沉积物的性质千差万别以及沿海地区坡度的变化。研究区的重矿物组合显示出低，高阶变质岩和一些基本的火成岩的分布。顶部岩心中少量锆石的存在暗示了返工沉积物对海洋输入的影响。XRF数据类似于浓度朝底部核心突然上升，表明微量元素与沉积物中的淤泥，粘土和有机物呈正相关。X射线衍射分析表明所有样品中均存在伊利石，这表明河口涌入阿拉伯海并进行了海浪改造。从整体研究得出的结论是，卡达伦迪河的排水