Scholarlink

<p>Detailed field mapping along with sedimentological descriptions has been used to characterise the Umba deposit in the Tanga Basin, in northern Tanzania, providing a better understanding of characteristic facies, facies associations, and depositional environments. Facies, facies associations and the depositional environments through which these deposits were laid down have been poorly understood. Fifteen sedimentary facies and seven facies associations (FA1-FA7) have been identified. They include thick, poorly bedded diamictite (FA1); thick, massive, homogeneous diamictite (FA2); dropstone-bearing, lenticular, ripped to laminated sandstone (FA3); lenticular to sub-horizontal sandstone (FA4); horizontally stratified wavy sandstone (FA5); tabular beds of sandstone, siltstone, and mudstone (FA6) and carbonate deposit (FA7). Based on the sedimentological features and regional correlation to the Ruhuhu basin of Tanzania and the Dwyka Group of the South African Karoo Basin, the identified sediments are interpreted to have been deposited mainly in low relief and extensive peneplain glaciofluvial-lacustrine settings with subordinate subglacial till (FA1 and FA2), proglacial braided river channels (FA3), and delta front environments. The delta front environment is characterised by a distributary channel (FA4), a subaqueous levee (FA5), a distal bar (FA6), and an overbank deposit (FA7). This study provides new insights into the deposition of the Lower Karoo-equivalent rocks, both at the local and regional levels.</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

Facies analysis and depositional environments of the Lower Karoo-equivalent beds in the Tanga Basin, Northern coastal Tanzania

  • 期刊论文

  • 发表日期：

    2025年7月17日

查看全文
  • Joyna Ludovick Kabohola,
  • Justina James Saroni,
  • Emily Barnabas Kiswaka,
  • Emmanuel Owden Kazimoto

摘要

Detailed field mapping along with sedimentological descriptions has been used to characterise the Umba deposit in the Tanga Basin, in northern Tanzania, providing a better understanding of characteristic facies, facies associations, and depositional environments. Facies, facies associations and the depositional environments through which these deposits were laid down have been poorly understood. Fifteen sedimentary facies and seven facies associations (FA1-FA7) have been identified. They include thick, poorly bedded diamictite (FA1); thick, massive, homogeneous diamictite (FA2); dropstone-bearing, lenticular, ripped to laminated sandstone (FA3); lenticular to sub-horizontal sandstone (FA4); horizontally stratified wavy sandstone (FA5); tabular beds of sandstone, siltstone, and mudstone (FA6) and carbonate deposit (FA7). Based on the sedimentological features and regional correlation to the Ruhuhu basin of Tanzania and the Dwyka Group of the South African Karoo Basin, the identified sediments are interpreted to have been deposited mainly in low relief and extensive peneplain glaciofluvial-lacustrine settings with subordinate subglacial till (FA1 and FA2), proglacial braided river channels (FA3), and delta front environments. The delta front environment is characterised by a distributary channel (FA4), a subaqueous levee (FA5), a distal bar (FA6), and an overbank deposit (FA7). This study provides new insights into the deposition of the Lower Karoo-equivalent rocks, both at the local and regional levels.