Scholarlink

The NE-SW trending Central Indian Tectonic Zone (CITZ) is a central suture zone situated between the north and south Indian cratonic blocks. The CITZ comprises Betul, Chhindwara, and Bhandara-Balaghat (BB) mafic magmatic sequences from north to south. The development of BB and Betul-Chhindwara mafic magmatic sequences has been studied using geochemistry, petrogenesis, and isotopes. Geochemical signatures correspond to tholeiitic affinity with basalt-to-basaltic-andesite composition. Primary magmatic differentiation of the igneous protolith recognized by inverse correlation within major elements against silica. Rare-earth element patterns depicting slight enrichment with LREE enrichment (~20–30 times chondrite with ∑LREE/HREE = 1.78 abundance ratio) for BB mafics. Chhindwara mafics display an LREE enrichment (~60–100 times chondrite with abundance ratio of ∑LREE/HREE = 5.88). However, Betul mafics show LREE enrichment with ~20–60 times chondrite, and an abundance ratio of ∑LREE/HREE = 3.87. Multi-element patterns show depletion in Rb, Th, Nb, P, and Ti with positive Ba, K, Eu, and Pb anomalies for BB mafics. However, no depletion observed in Nb, P, Ti, and positive anomalies occur in Pb and Eu for Betul mafics, whereas deletion observed in Rb, Th, Nb, Sr, and Ti, positive enrichment showing in Ba, U, Pb, and Ti for Chhindwara mafics. These variations may reflect difference in source characteristics and could be related to fractionations of plagioclase, Ti-magnetite, and ilmenite-titanite. Sm–Nd model ages for BB mafics and Betul mafics are 3254 Ma and 2763 Ma, respectively. Transitional (arc to within plate) tectonics settings have been observed for these mafic magmatic sequences.

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

Petrogenesis and Geochemical Characterization of Mafic Magmatic Rocks from the Central Indian Tectonic Zone (CITZ): Insights into Crustal Evolution

  • 会议论文

  • 发表日期：

    2025年

查看全文
  • Meraj Alam,
  • Talat Ahmad,
  • Tatiana V. Kaulina

摘要

The NE-SW trending Central Indian Tectonic Zone (CITZ) is a central suture zone situated between the north and south Indian cratonic blocks. The CITZ comprises Betul, Chhindwara, and Bhandara-Balaghat (BB) mafic magmatic sequences from north to south. The development of BB and Betul-Chhindwara mafic magmatic sequences has been studied using geochemistry, petrogenesis, and isotopes. Geochemical signatures correspond to tholeiitic affinity with basalt-to-basaltic-andesite composition. Primary magmatic differentiation of the igneous protolith recognized by inverse correlation within major elements against silica. Rare-earth element patterns depicting slight enrichment with LREE enrichment (~20–30 times chondrite with ∑LREE/HREE = 1.78 abundance ratio) for BB mafics. Chhindwara mafics display an LREE enrichment (~60–100 times chondrite with abundance ratio of ∑LREE/HREE = 5.88). However, Betul mafics show LREE enrichment with ~20–60 times chondrite, and an abundance ratio of ∑LREE/HREE = 3.87. Multi-element patterns show depletion in Rb, Th, Nb, P, and Ti with positive Ba, K, Eu, and Pb anomalies for BB mafics. However, no depletion observed in Nb, P, Ti, and positive anomalies occur in Pb and Eu for Betul mafics, whereas deletion observed in Rb, Th, Nb, Sr, and Ti, positive enrichment showing in Ba, U, Pb, and Ti for Chhindwara mafics. These variations may reflect difference in source characteristics and could be related to fractionations of plagioclase, Ti-magnetite, and ilmenite-titanite. Sm–Nd model ages for BB mafics and Betul mafics are 3254 Ma and 2763 Ma, respectively. Transitional (arc to within plate) tectonics settings have been observed for these mafic magmatic sequences.