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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Comparative study of soil profiles developed on metavolcanic (basaltic) rocks in two different watersheds of Garhwal Himalaya
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Comparative study of soil profiles developed on metavolcanic (basaltic) rocks in two different watersheds of Garhwal Himalaya

机译：Garhwal喜马拉雅山两个不同流域的超火山（玄武质）岩石发育的土壤剖面比较研究

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摘要

Soil profiles are rarely preserved in the Himalaya due to active tectonics and erosion. We have studied two rarely well-preserved soil profiles developed on metavolcanic rocks namely Alaknanda soil profile (ASP) and Bhilangna soil profile (BSP) in Alaknanda and Bhilangna watersheds of the Garhwal Himalaya. Geochemical studies were carried out to understand the elemental mobility with reference to the least altered rock (LAR) in both the profiles and are compared. Differences in major element behaviour noticed are depletion of Ca and K in ASP, and depletion of Ca and Na in BSP. Trace elements also show variable mobility such as leaching of Rb, U and enrichment of Sr, Ni in ASP. In BSP, behaviour of these elements is just the opposite. Accumulation of Sigma REEs in saprolitic layer and depletion in regolith of ASP suggest that rare earth element (REE) mobility took place during advanced stages of weathering. In BSP, increase in REE content from LAR to regolith suggests dominance of chemical weathering over physical weathering. This is also reflected in chemical index of alteration values which suggest variation of climatic parameters such as rainfall in the region.
机译：由于活跃的构造和侵蚀作用，喜马拉雅山很少保留土壤剖面。我们研究了在加尔瓦尔·喜马拉雅山的阿拉克南达和比兰格纳分水岭上的两个极少保存完好的在超火山岩上发育的土壤剖面，即阿拉克南达土壤剖面（ASP）和比兰纳土壤剖面（BSP）。进行了地球化学研究，以了解两种剖面中变化最小的岩石（LAR）的元素迁移率，并进行了比较。注意到主要元素行为的差异是ASP中Ca和K的消耗，以及BSP中Ca和Na的消耗。痕量元素还显示出可变的迁移率，例如ASP中Rb，U的浸出和Sr，Ni的富集。在BSP中，这些元素的行为恰好相反。腐殖质层中Sigma REE的积累和ASP灰岩的耗竭表明，稀土元素（REE）的迁移发生在风化的晚期。在BSP中，从LAR到长白土的REE含量增加表明化学风化相对于物理风化具有优势。这也反映在变化值的化学指数中，这表明气候参数的变化，例如该地区的降雨。

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