Parageneses of TiB2 in corundum xenoliths from Mt. Carmel, Israel: Siderophile behavior of boron under reducing conditions
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William L. Griffin
, Sarah E.M. Gain
, Martin Saunders , Luca Bindi, Olivier Alard
, Vered Toledo und Suzanne Y. O’Reilly
Abstract
Titanium diboride (TiB2) is a minor but common phase in melt pockets trapped in the corundum aggregates that occur as xenoliths in Cretaceous basaltic volcanoes on Mt. Carmel, north Israel. These melt pockets show extensive textural evidence of immiscibility between metallic (Fe-Ti-C-Si) melts, Ca-Al-Mg-Si-O melts, and Ti-(oxy)nitride melts. The metallic melts commonly form spherules in the coexisting oxide glass. Most of the observed TiB2 crystallized from the Fe-Ti-C silicide melts and a smaller proportion from the oxide melts. The parageneses in the melt pockets of the xenoliths require
Funding source: University of Western Australia
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Funding source: Macquarie University
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Funding source: Department of Education and Training
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Funding statement: The authors acknowledge the facilities and the scientific and technical assistance of Microscopy Australia at the Centre for Microscopy, Characterization and Analysis, the University of Western Australia, a facility funded by the University, State, and Commonwealth Governments. The study also used instrumentation at Macquarie University, funded by ARC Linkage Infrastructure, Equipment and Facilities (LIEF) and Department of Education and Training (DEST) Systemic Infrastructure Grants. Luca Bindi thanks MIUR-PRIN2017, project “TEOREM deciphering geological processes using Terrestrial and Extraterrestrial ORE Minerals,” prot. 2017AK8C32. This is contribution 1427 from the ARC Centre of Excellence for Core to Crust Fluid Systems (http://www.ccfs.mq.edu.au), and contribution 1368 from the GEMOC ARC National Key Centre (http://www.gemoc.mq.edu.au).
Acknowledgments
We thank Tim Murphy for his assistance with the SEM and EMP analyses, and Sean Murray for guidance on the FE-SEM imaging at Macquarie University. Vadim Kamenetsky is thanked for providing the FE-SEM image used as Figure 3b, and its EDS analyses. We are grateful to Fernando Cámara for perspicacious discussions and commentary. The manuscript was improved through reviews by Jan Cempirek, Chi Ma, and Associate Editor Ed Grew.
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Artikel in diesem Heft
- Parageneses of TiB2 in corundum xenoliths from Mt. Carmel, Israel: Siderophile behavior of boron under reducing conditions
- Crystal structure and Raman spectroscopic studies of OH stretching vibrations in Zn-rich fluor-elbaite
- Crystal structure of Ag-exchanged levyne intergrown with erionite: Single-crystal X-ray diffraction and Molecular Dynamics simulations
- Br diffusion in phonolitic melts: Comparison with fluorine and chlorine diffusion
- Crystal chemistry and microfeatures of gadolinite imprinted by pegmatite formation and alteration evolution
- A new occurrence of corundum in eucrite and its significance
- Zircon survival in shallow asthenosphere and deep lithosphere
- Reconsidering initial Pb in titanite in the context of in situ dating
- Solubility of Na2SO4 in silica-saturated solutions: Implications for REE mineralization
- Vanadium micro-XANES determination of oxygen fugacity in olivine-hosted glass inclusion and groundmass glasses of martian primitive shergottite Yamato 980459
- Donwilhelmsite, [CaAl4Si2O11], a new lunar high-pressure Ca-Al-silicate with relevance for subducted terrestrial sediments
- Magnetite texture and trace-element geochemistry fingerprint of pulsed mineralization in the Xinqiao Cu-Fe-Au deposit, Eastern China
- Magmatic haggertyite in olivine lamproites of the West Kimberley region, Western Australia
- Trace elements in sulfides from the Maozu Pb-Zn deposit, Yunnan Province, China: Implications for trace-element incorporation mechanisms and ore genesis
- Letter
- New pressure-induced phase transition to Co2Si-type Fe2P
- Effects of small crystallite size on the thermal infrared (vibrational) spectra of minerals