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Home > Sciences & Environment > Earth sciences > Determination of Trace Platinum Group Elements in Geological Samples: Application to Emeishan Flood Basalts in SW China
Determination of Trace Platinum Group Elements in Geological Samples: Application to Emeishan Flood Basalts in SW China

Determination of Trace Platinum Group Elements in Geological Samples: Application to Emeishan Flood Basalts in SW China


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About the Book

This dissertation, "Determination of Trace Platinum Group Elements in Geological Samples: Application to Emeishan Flood Basalts in SW China" by Liang, Qi, 漆亮, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled DETERMINATION OF TRACE PLATINUM GROUP ELEMENTS IN GEOLOGICAL SAMPLES: APPLICATION TO EMEISHAN FLOOD BASALTS IN SW CHINA Submitted by Liang Qi for the degree of Doctor of Philosophy at The University of Hong Kong in February 2007 This thesis concerns the development of three new analytical methods for precise and accurate measurement of low concentrations of platinum group elements in geological samples, and the application of these methods to the Emeishan continental flood basalts of SW China. The new methods include: (1) Na O fusion: The sample was decomposed in a corundum crucible. Isotope 2 2 dilution-inductively coupled plasma mass spectrometry (ID-ICP-MS) was used for the determination of Pt, Pd, Ru and Ir, whereas the mono-isotopic elements, Rh and Au, are determined by external calibration using Lu as an internal standard. (2) Acid dissolution combined with Na O fusion: a 10-gram sample was 2 2 194 decomposed by HF, HNO and HCl combined with Na O alkaline fusion. A Pt 3 2 2 spike was used as an internal standard to calculate the Rh content and improve recoveries. Combining a cation exchange resin with a P507 extraction chromatograph resin in the same column removes all of the interfering elements. (3) Improved Carius tube technique: The Carius tube was placed in a sealed, stainless steel, high-pressure autoclave filled with water. During heating, the external pressure produced by the water balances the internal pressure of the Carius tube preventing possible explosions. Consequently, a relatively high temperature, a greater volume of aqua regia and a larger amount of sample can be used for sample digestion. The Late-Middle Permian Emeishan basalts are widespread in SW China. Samples were collected from a 550-m-thick section composed of 12 flows of high-Ti basalts at Heishitou, Guizhou province and a 3800-m-thick section composed of 4 Units at Longzhoushan in the Panxi area, Sichuan province. The samples were analyzed for PGEs using the improved Carius tube technique, in addition to major and trace elements and Sr-Nd-Os isotopic compositions. The high-Ti basalts at Heishitou show a decrease of Zr/Nb, Th/Nb and Th/Ta ratios from the base to the top of the sequence. Different lava flows have distinct primitive mantle-normalized chalcophile element patterns with negative Ru 187 188 anomalies. The Os-poor basalts have variable initial Os/ Os isotopic ratios. Pd/Ir ratios show a strong negative correlation with Pt/Pd ratios. The volcanic sequence in Longzhoushan includes high-Ti basalts (Units 1 and 2), tephrites (Unit 3) and basaltic andesites (Unit 4). The primitive mantle-normalized trace element diagrams of the basaltic andesites show greater depletion of Ba, Nb and Sr than those of the basalts and tephrite. The tephrites have relatively high Na O (4.5-7.7 wt%) and K O (1.9-5.4 wt%) and are relatively enriched in large ion lithophile elements. Three tephrite samples with relatively high Cr contents show smooth primitive mantle-normalized chalcophile element patterns. The distinct geochemical features of the tephrites suggest that they were derived from mantle sources different from the basalts and basaltic andesites with variable degrees of partial melting. DOI: 10.5353/th_b3879107 Subjects: Basalt - China - Emei Mountain Basalt - Analysis


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Product Details
  • ISBN-13: 9781361438657
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 262
  • Sub Title: Application to Emeishan Flood Basalts in SW China
  • Width: 216 mm
  • ISBN-10: 1361438657
  • Publisher Date: 27 Jan 2017
  • Binding: Paperback
  • Language: English
  • Spine Width: 14 mm
  • Weight: 612 gr


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