Articles written in Journal of Earth System Science

    • Implication of weathering and mineral sorting on rare earth element geochemistry of Pleistocene–Holocene sediments from Cauvery delta, south India


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      REE analysis of sediments was carried out on representative samples from two cores drilled at Uttrangudi and Porayar locations from Cauvery delta in south India to better understand the patterns and textural and mineralogical control on REEs. Good correlation of REEs and their chondrite normalized ratios $\rm{(Gd/Yb and La/Yb)_{N}}$ with Ti, Th and Y in both the cores suggest control of Allanite, Titanite and Monazite among heavy minerals on the REE distribution in sediments. Good to strong positive correlation among REEs and Al, Fe, Mg, Ni, Cr, Sc and Co in both the cores suggests partial control of mafic minerals and clay. The Eu/Eu* values show a significant negative correlation with the CIA values, suggesting that the Eu in sediments has been modified to some extent by the process of weathering, affecting its loss and consequently lowering of Eu/Eu* values particularly in Uttrangudi sediments. The correlation of various trace elements with Eu/Eu* suggests that the enrichment of LREE bearing heavy minerals (Allanite, Titanite and Monazite) has resulted in relatively higher increase in LREE and HREE in comparison to Eu that is dominantly held in feldspars, which has further resulted in decreased value of Eu/Eu*.

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