 | | Journal (article/letter/editorial) | | Hydrothermal zircons and zircon overgrowths, Sierra Blanca Peaks, Texasx Jnrrnnv N. RunrN, Cnnrsropnnn D....Geology, The University of Texas at Austin, University Station, Box X, Austin, Texas 78713, U.S.A Ansrnlcr...Ansrnlcr Zircons from the Sierra Blanca Peaks, a group of mildly peraluminous, rare-elementenriched rhyolite...relative to cores.Magmatic zircons from the Sierra Blanca intrusion show a negative correlation between...limestone that are associated with intrusion of the Sierra Blanca laccoliths contain subhedral to anhedral, commonly |  | | Journal (article/letter/editorial) | | Trans-Pecos, Texas Brent A. Elliott The Bureau of Economic Geology, The University of Texas at Austin,... Austin, TX 78712, USA; brent.elliott@beg.utexas.edu; Tel.: +1-512-471-1812 Received: 9 August 2018;...Abstract: The Round Top rhyolite located in Trans-Pecos Texas is enriched in Be, F, Li, Nb, Rb, Sn, Th, U, Y,...petrogenesis 1. Introduction The Trans-Pecos region of Texas hosts more than 100 Paleocene to Miocene age intrusive...including Round Top and the other laccoliths of the Sierra Blanca Complex (SBC) are hypabyssal, sub-volcanic, |  | | Journal (article/letter/editorial) | | Universityof Texas at Austin, Austin, TX 78712, USA bBureau of Economic Geology, Universityof Texas at Austin...78713-7508, USA CNevadaBureau of Mines and Geology, UniversityofNevada-Reno, Reno, NV89557-0088, USA (Received...locations in the Trans-Pecos Magrnatic Province, Texas, U.S.A., demonstrate this hydrothermal Zr mobility...elements (REE), Y, Nb, Mo, Hf, Pb, Th and U. The Sierra Blanca intrusions, a series of mildly peraluminous...Ertsberg District of Irian Jaya, Indonesia. Unlike in Texas, related igneous rocks are metaluminous, and the |  | | Journal (article/letter/editorial) | | comparatively simple magmatic precursor minerals such as columbite and zircon by F-rich deuteric solutions that were...Compositions range from simple stoichiometric columbite ((Fe, Mn) (Nb, Ta 2 06)) with analytical totals...Y-REE phases are unequivocally later than the columbite (Fig. 4). In the trachytes, the Y-REE niobates...U 0.00 0.00 Si 1.00 1.00 Y 0.05 0.00 AI 0.03 0.00 Fe 0.04 0.00 Nb 0.01 0.00 Ca 0.03 0.00 O 6.70 4.03 ...06 0.10 0.00 0.11 9.76 umbite through altered columbite to Y-REE niobate. In addition, the Niobium Tuff |  | | Journal (article/letter/editorial) | | formula elements by non-formula elements, such as Ca, Fe, P and REE. The most reliable geochemical indicators...arfvedsonite; bast, bastnäsite; brith, britholite; col, columbite; epid, epidote; ferg, fergusonite; mcl, microcline;...hydrothermal fluids to a bastnäsite-(Ce)-ilmenite-columbite-(Fe) assemblage through a series of texturally complex...0.000 Gd 0.000 0.000 Y 0.010 0.012 Ca 0.030 0.046 Fe 0.310 0.328 Mn 0.124 0.017 Mg 0.074 0.008 Ti 0.062...crystal in Fig. 1b. bd, below detection. FeO*, all Fe as Fe2+. Sample EL-127. chev7 and K6 were made by |  | | Journal (article/letter/editorial) | | respect to abundances of Zr, Hf, REE, Y, P, Th, Ca, Al, Fe and As. According to their geochemical signatures...Element abundances of Al, As, Bi, Ca, Dy, Er, F, Fe, Gd, Hf, Ho, La, Lu, Mg, Mn, Nb, Nd, P, Pb, Pr, Sc...Element Line Spectrometer crystal Standard Al Ca F Fe Kα Kα Kα Kα TAP LLIF PC1 LLIF Almandine Andradite...Rhodonite Fluorapatite Zircon InAs Bi–metal HfO2 Columbite-(Fe) PbSe ScVO4 ThO2 U–metal Scheelite Zircon LaPO4...distribution of Fe is heterogeneous with measured abundance ranging from 0.0 to 0.13 apfu Fe (Fig. 8a). Zircon |  | | Book | | Truran, Jr. and A. Heger University of Chicago, IL, USA 1.01.1 INTRODUCTION 1.01.2 ABUNDANCES AND NUCLEOSYNTHESIS...at the position of 56Fe; and (iv) the abundance peaks in the region past iron at the neutron closed shell...H He He O, C C Ne Ne, Mg O, Mg O Si, S Si Fe Secondary products 14 N O, 22Ne s-Process Na Al...iron-peak nuclei from titanium to zinc (Ti – V –Cr – Mn – Fe– Co –Ni – Cu –Zn). Calculations of explosive nucleosynthesis...of our galaxy yield ,2 £ 109 yr. at a metallicity [Fe/H] ,21 (Kobayashi et al., 2000; Goswami and Prantzos |
|
