Noble Metals, U, Pb and HREE Bearing Baddeleyite from Placer Sands of Manavalakurichi, Tamil Nadu, India
Earth Sciences
Volume 3, Issue 1, February 2014, Pages: 31-33
Received: Sep. 10, 2013; Published: Mar. 20, 2014
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Authors
Ramachandran Ramasamy, Department of Ocean Engineering, Indian Institute of Technology-Madras, Chennai, India
Subramanian Subramanian, Department of Ocean Engineering, Indian Institute of Technology-Madras, Chennai, India
Ranganathan Sundaravadivelu, Department of Ocean Engineering, Indian Institute of Technology-Madras, Chennai, India
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Abstract
Heavy mineral placer sands were collected from Manavalakurichi, Tamil Nadu. A broken piece of a euhedral grain of dark brown placer sand grain was examined under High Resolution Scanning Electron microscope attached with EDAX probe analyzer. The grain is enriched with zirconium oxide but it is greatly impoverished in silica to form zircon. From normative calculation, it is known that ZrO2 remains as 47% wt% as baddeleyite after saturating 36% of zircon with all available cations to fill tetrahedral sites. The mineral is enriched with heavy rare earth elements, dense platinum group of elements and gold. LREE, PGE of lower atomic numbers and Ag are characteristically absent in this mineral. The numbers of ions calculated on the basis of 2(O) ions for baddeleyite (Zr0.662 P0.065 Fe0.029 Y0.029 U0.028Dy0.014Si0.111Hf0.008Al0.008 Os0.008Ir0.008Pt0.007 Pb0.007 Ta0.006 Au0.006 Ti0.005 Lu0.005 Na0.004Yb0.004) structure indicating deficiency of 0.105 metallic ions after entering all the metallic ions into the mineral structure. The high Zr/Hf, ratio of 45.9 indicates that early crystallization of baddeleyite. Therefore, it might be related to the provenance of either silica undersaturated ultrabasic rocks or volcanic rocks derived from mantle horizon probably crystallized at temperature below 1170oC.
Keywords
Baddeleyite, Zircon, Platinum Group of Elements, Heavy Rare Earth Elements, Gold, U-Pb, Beach Placers
To cite this article
Ramachandran Ramasamy, Subramanian Subramanian, Ranganathan Sundaravadivelu, Noble Metals, U, Pb and HREE Bearing Baddeleyite from Placer Sands of Manavalakurichi, Tamil Nadu, India, Earth Sciences. Vol. 3, No. 1, 2014, pp. 31-33. doi: 10.11648/j.earth.20140301.15
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