Mineral chemistry and alteration characteristics of spinel in serpentinised peridotites from the Northern Central Indian Ridge

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• 作者：Ranadip Banerjee ; Dwijesh Ray ; Teruaki Ishii
• 关键词：Mineral chemistry ; Spinel ; Serpentinites ; Alteration characteristics ; Central Indian Ridge
• 刊名：Journal of the Geological Society of India
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：86
• 期：1
• 页码：41-51
• 全文大小：1,059 KB
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• 作者单位：Ranadip Banerjee (1)
  Dwijesh Ray (2)
  Teruaki Ishii (3)
  
  1. National Institute of Oceanography, Dona Paula, Goa, 403004, India
  2. PLANEX, Physical Research Laboratory, Ahmedabad, 380009, India
  3. Fukada Geological Institute, Honkomagome, Tokyo, 113-0021, Japan
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Geology
  Geosciences
  Geography
  Mineralogy
  
• 出版者：Springer India, co-published with Geological Society of India
• ISSN：0974-6889

文摘

Serpentinites (frequently cross cut by gabbroic dikelet), collected from Northern Central Indian Ridge (NCIR), Indian Ocean, contain both Cr-rich (Group I) and Cr-poor (Group II) variety of spinel. Based on mineralogy they can be classified as non-residual and residual spinel, respectively. While, non residual spinel (TiO2 up to 0.5 wt %; Group I) display the evidences of peridotite-gabbro interaction, residual spinel (TiO2<0.1 wt%; Cr# ~24; Group II), suggests intermediate degree of partial melting (~10%) of mantle peridotite, which falls between most depleted mantle peridotite (~15%) and most fertile peridotite (~5%). Alteration of spinel porphyroclast is conceded by the presence of relict fresh interior, intermediate ferritchromit zone and secondary magnetite at the margins. Due to the effect of serpentinisation, marginal areas of spinel porphyroclasts display increasing Fe, but decreasing Al and Mg, while their Cr content remains unaffected throughout the spinel.