Dataset on the Geochemistry of soils and their corresponding granitoid plutons of Proterozoic era in Eastern Dharwar Craton, Southern India

This data article provides a detailed dataset on the collected soil samples from the regolith portion of Alkali-Granitoid plutons, those emplaced along the transition zone between Eastern Dharwar Craton and Eastern Ghat Mobile Belt in southern India, due to orogenic collision & later anorogenic rift related tectonism during Proterozoic era. Soils derived from corresponding Paleo to Mesoproterozoic orogenic & anorogenic plutons at Vinukonda, Elechur, Pasupugallu, Podili and Kanigiri majorly showing the enrichment of ∑HREESoil>∑HREERock, the enrichment factor varies from 1.65 to 6.18. Except Vinukonda, Podili, the other soils exhibiting the characteristics of ∑LREESoil>∑LREERock, ∑REESoil>∑REERock, the enrichment factor in soils varies from 1.77 to 3.01 and from 1.9 to 3.05 respectively. Majority of these soils were derived medium to poor grade of weathering and the Chemical Index of Alteration is from 26.30 to 74.92. Although, fractionation of REE in weathered granite/Soil is controlled by the occurrence of REE-bearing minerals and adsorption by weathering products, the ion-adsorption fraction tends to be enriched in HREE relative to source rock.本数据论文详述了一套完整的土壤样品数据集，样品采自印度南部东达瓦尔克拉通（Eastern Dharwar Craton）与东高止山活动带（Eastern Ghat Mobile Belt）过渡带就位的碱性花岗质岩体（Alkali-Granitoid plutons）的风化疏松层（regolith）中。该岩体形成于元古宙（Proterozoic era）时期的造山碰撞作用及后期非造山裂谷相关构造运动。采样点分布于Vinukonda、Elechur、Pasupugallu、Podili及Kanigiri地区，对应古元古代至中元古代的造山与非造山岩体。这批土壤整体呈现出土壤总重稀土元素（∑HREESoil）高于母岩总重稀土元素（∑HREERock）的富集特征，其富集因子介于1.65至6.18之间。除Vinukonda与Podili地区外，其余采样点的土壤均表现出土壤总轻稀土元素（∑LREESoil）高于母岩总轻稀土元素（∑LREERock）、土壤总稀土元素（∑REESoil）高于母岩总稀土元素（∑REERock）的特征，对应的富集因子分别介于1.77至3.01与1.9至3.05之间。绝大多数此类土壤均形成于中等至较弱程度的风化作用，其化学风化指数（Chemical Index of Alteration, CIA）介于26.30至74.92之间。尽管风化花岗岩与土壤中的稀土元素（Rare Earth Element, REE）分馏作用受含稀土矿物赋存状态及风化产物吸附作用共同调控，但相较于母岩，离子吸附态组分通常更易于富集重稀土元素（Heavy Rare Earth Element, HREE）