Scholarlink

<p>Rare Earth Elements (REE) play an important role in deciphering the nature of source rock and identifying neotectonic activity; therefore, the present study focused on investigating the distribution of REE in Gomati River sediments and the impact of subsurface tectonism in the Ganga alluvial plain. Twenty-nine bedload sediments and four biotite samples were analysed by ICP-MS. The total REE concentrations range from 53.72 to 676.44&#xa0;µg/g (average 186.04&#xa0;µg/g), whereas cerium (Ce: 299.92&#xa0;µg/g) is the most abundant REE in the Gomati river sediments. The highest REE value (676.44&#xa0;µg/g) was observed in the middle segment, where the sand fraction was converted into the fine clay content due to upliftments of the subsurface Faizabad Ridge. The chondrite-normalization of the sediment samples shows that the light REE (LREE) enrichment and flat heavy REE (HREE) pattern are very similar to those of the Ganga River sediments in the Himalayan region. LREE comprised approximately 92% of the total REE in bedload sediments; such patterns imply the dominance of the felsic source rock. Europium (Eu) anomaly ranged from 0.44 to 0.98, with most of the samples showing a prominent negative anomaly, except sample 05 (0.98), which shows a low positive anomaly. Mineral geochemistry revealed that Biotite is the major source of REE in the Gomati River basin. Igeo shows that the basin bears the imprint of anthropogenic activities in the main urban centers. The cyclic pattern of REE distribution evidences uneven weathering in the basin; the bulging of the Faizabad ridge forces sediment to undergo greater weathering at the Kurwar site, converting the sand fraction into fine clay and silt. Mostly REE reside in the space lattice of clay minerals and are adsorbed onto the surface of the clay fraction. Thus, the Ganga alluvial plain is important for studying the geochemical behavior of REE, the weathering processes of river sediments, and the interactions between humans and the environment.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Rare Earth Elements geochemistry of Gomati river sediments: Implications of subsurface tectonism, Ganga Alluvial Plain, India

  • 期刊论文

  • 发表日期：

    2026年1月7日

查看全文
  • Jitendra Kumar Yadav,
  • Mukul Raj Gupta,
  • Munendra Singh,
  • Sandeep Singh

摘要

Rare Earth Elements (REE) play an important role in deciphering the nature of source rock and identifying neotectonic activity; therefore, the present study focused on investigating the distribution of REE in Gomati River sediments and the impact of subsurface tectonism in the Ganga alluvial plain. Twenty-nine bedload sediments and four biotite samples were analysed by ICP-MS. The total REE concentrations range from 53.72 to 676.44 µg/g (average 186.04 µg/g), whereas cerium (Ce: 299.92 µg/g) is the most abundant REE in the Gomati river sediments. The highest REE value (676.44 µg/g) was observed in the middle segment, where the sand fraction was converted into the fine clay content due to upliftments of the subsurface Faizabad Ridge. The chondrite-normalization of the sediment samples shows that the light REE (LREE) enrichment and flat heavy REE (HREE) pattern are very similar to those of the Ganga River sediments in the Himalayan region. LREE comprised approximately 92% of the total REE in bedload sediments; such patterns imply the dominance of the felsic source rock. Europium (Eu) anomaly ranged from 0.44 to 0.98, with most of the samples showing a prominent negative anomaly, except sample 05 (0.98), which shows a low positive anomaly. Mineral geochemistry revealed that Biotite is the major source of REE in the Gomati River basin. Igeo shows that the basin bears the imprint of anthropogenic activities in the main urban centers. The cyclic pattern of REE distribution evidences uneven weathering in the basin; the bulging of the Faizabad ridge forces sediment to undergo greater weathering at the Kurwar site, converting the sand fraction into fine clay and silt. Mostly REE reside in the space lattice of clay minerals and are adsorbed onto the surface of the clay fraction. Thus, the Ganga alluvial plain is important for studying the geochemical behavior of REE, the weathering processes of river sediments, and the interactions between humans and the environment.