... of the crystal structure ( R 1 = 0.075) gave the following data: orthorhombic, space group Pban , a = 7.2585(4), b = 25.8099(15), c = 3.8177(2) Å, Z = 2. Tewite has a new tungsten-bronze (TB)-type derivative structure. Distorted TeO 6 octahedra break TB slabs into ribbons which are displaced by ½ a relative...

... by the Mineralogical Society of America 2018 Mineralogical Society of America Porphyry deposits molybdenum tungsten diffusivity granitic melt Porphyry-type ore deposits, of which the majority were formed in the Phanerozoic ( Kesler and Wilkinson 2008 ), are commonly found at oceanic or continental...

...Bin Yang; Yin-he Xiang; Xiangping Gu Electron-microprobe analysis and X-ray micro-diffraction show the presence of tungsten-bearing rutile in the Jinling, Jiaojia, Linglong and Hexi gold deposits in the Jiaodong gold province. The tungsten-bearing rutile appears both in gold-bearing quartz veins...

... minerals. Tin hot spots and anomaly zones were revealed along the Volturno River and urban areas. Tungsten is the element out of the three which is best related to the presence of volcanic rocks belonging to the Neapolitan Potassic Province. * Correspondence: carmela.rezza@unina.it 13 09 2017...

... relevant to the skarn settings where the host rocks are carbonates, which in general have elevated Sr contents ( Kinsman 1969 ). In addition, the in situ Sr isotope study of scheelite from the Felbertal tungsten deposit (Austria) by Kozlik et al . (2016) shows changes in the Sr isotopic composition...

... triggered contact metamorphism at 200 MPa and 500–600°C which was sufficient to promote a vigorous hydrothermal convection cell (Noronha and Ribeiro, 1983 ; Noronha et al. , 2000 ). The Borralha ore deposit is an important tungsten deposit of Portugal second only to Panasqueira. It was mined from...

... . Pattou , L. , Lorand , J. P. , Gros , M. ( 1996 ) Non-chondritic platinum group element ratios in the Earth’s mantle . Nature 379 , 712 – 715 . Rammensee , W. , Wänke , H. ( 1977 ) On the Partition Coefficient of Tungsten between Metal and Silicate and its Bearing...

... oxidising environment. Tungsten and Mo would not even enter the alloys of highly refractory metals and would behave as volatile elements. If W and Mo containing refractory metal alloys were heated under oxidising conditions W would be the first element to be lost from the alloy, followed by Mo and at still...

... behaviour of tungsten . Nature 297 , 210 – 212 . Palme , H. , Rammensee , W. ( 1981 a) The cosmic abundance of Molybdenum . Earth and Planetary Science Letters 55 , 356 – 362 . Palme , H. , Rammensee , W. ( 1981 b) The significance of W in planetary differentiation...

... are orders of magnitude more sensitive than the traditional β-counting. REFERENCES SECTION 4 Leya , I. , Wieler , R. , Halliday , A.N. ( 2000 ) Cosmic-ray production of tungsten isotopes in lunar samples and meteorites and its implications for Hf-W cosmochemistry . Earth and Planetary...

... of this study were done at the ETH in Zürich, where I stayed for several months after my retirement. Tungsten and some other trace element concentrations were determined by Carsten Münker in Cologne. Determining bulk meteorite compositions will help to indentify new types of meteorites. The north-west...

...-mail address : ben.james.cave@gmail.com 30 November 2016 21 September 2017 © 2017 Mineralogical Association of Canada 2017 Orogenic gold tungsten rutile ilmenite metal availability metals source mineral recrystallization coupled dissolution–re-precipitation processes...