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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/5882
Title: Rinkite, cerianite-(Ce), and hingganite-(Ce) in syenite gneisses from the Sushina Hill Complex, India: Occurrence, compositional data and petrogenetic significance
Authors: Chakrabarty A.
Mitchell R.H.
Ren M.
Sen A.K.
Pruseth K.L.
Published in: Mineralogical Magazine
Abstract: Accessory rare earth element (REE) minerals occur in small quantities in agpaitic and miaskitic nepheline syenite gneisses of the Sushina Hill Complex, India. The REE-rich minerals restricted mainly to the agpaitic rocks are rinkite, cerianite-(Ce), and cerian thorite. Rinkite, formed at the ortho-magmatic stage predates other REE-rich phases and is the most Nd-F-rich rinkite (6.62-7.45 wt.% Nd2O3; 8.75-9.74 wt.% F) with very high Nd/Ce (>2.46) ratios reported to date. Hydrothermal cerianite-(Ce), formed by the decomposition of eudialyte in the agpaitic rocks, occurs as small rounded crystals rich in Ce (?63-74 wt.% CeO2) and Y (6.03-11.69 wt.% Y2O3). The presence of cerianite-(Ce) indicates formation in an evolving hydrothermal fluid in an oxidizing milieu. Hingganite-(Ce) is present in the miaskitic unit and is considered to represent the superposition of an agpaitic mineral on an initial miaskitic assemblage. Hingganite-(Ce) is characterized by elevated contents of Ce (18.03-21.94 wt.% Ce2O3), and Nd (13.90-15.40 wt.% Nd2O 3). Experimental data, coupled with the observed assemblage, suggest that the hingganite-(Ce) precipitated from the hydrothermal fluid between 400 and 300 C followed by cerianite-(Ce) (<?300 C). This conclusion implies that eudialyte decomposition was probably initiated above 400 C. © 2013 Mineralogical Society.
Citation: Mineralogical Magazine (2013), 77(8): 3137-3153
URI: https://doi.org/10.1180/minmag.2013.077.8.08
http://repository.iitr.ac.in/handle/123456789/5882
Issue Date: 2013
Keywords: Agpaitic Systems
Cerianite-(Ce)
Eudialyte
Hingganite-(Ce)
Rinkite
ISSN: 0026461X
Author Scopus IDs: 25121521500
7403973150
7103161073
7401592446
6602967190
Author Affiliations: Chakrabarty, A., Department of Geology, Durgapur Government College, Durgapur, West Bengal, 713214, India
Mitchell, R.H., Department of Geology, Lakehead University, Thunder Bay, ON P7B 5E1, Canada
Ren, M., Department of Geoscience, University of Nevada, Las Vegas, NV, United States
Sen, A.K., Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand-247667, India
Pruseth, K.L., Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand-247667, India, Department of Geology and Geophysics, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India
Corresponding Author: Chakrabarty, A.; Department of Geology, Durgapur Government College, Durgapur, West Bengal, 713214, India; email: aniket_chakrabarty@rediffmail.com
Appears in Collections:Journal Publications [ES]

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