Download or read book Quartz Normative Plutonic Rocks of Interior Alaska and Their Favorability for Association with Gold written by L. E. Burns and published by . This book was released on 1991 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geologic Studies in Alaska by the U S Geological Survey 1996 written by John E. Gray and published by . This book was released on 1998 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geologic Studies in Alaska by the U S Geological Survey 1996 written by and published by . This book was released on 1998 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Geological Survey Professional Paper written by and published by . This book was released on 1984 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Data for Plutonic Rocks and Associated Gold Deposits in Interior Alaska written by Rainer J. Newberry and published by . This book was released on 1995 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Yukon Training Area and Fort Greely Alaska Army Lands Withdrawal Renewal written by and published by . This book was released on 1999 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mineralized Intrusion related Skarn Systems written by David Richard Lentz and published by . This book was released on 1998 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the Sapporo International Conference on Mineral Resources of the NW Pacific Rim 1994 written by Shunsō Ishihara and published by . This book was released on 1995 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Tintina Gold Belt written by and published by . This book was released on 2000 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography and Index of Geology written by and published by . This book was released on 1992 with total page 1544 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Economic Geology of Haines Klukwan Porcupine Area Southeastern Alaska written by and published by . This book was released on 1991 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Checklist of State Publications written by Library of Congress. Exchange and Gift Division and published by . This book was released on 1992 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt: An annual index to the monographs appears early in the following year.

Download or read book Mid Cretaceous Plutonic related Gold Deposits of Interior Alaska written by Daniel Thomas McCoy and published by . This book was released on 2000 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Mid-cretaceous gold deposits in interior Alaska are hosted in or near apices of low magnetite plutons that are formed in a broad continental arc. Ore is hosted in 1) anastomosing quartz veins with potassic or albitic envelopes, 2) planar veins and shear zones with sericitic alteration, and 3) pyroxene-rich skarn deposits. This study was undertaken to constrain the fluid and metal source and composition, formation conditions, gold associative mineralogy, age relationships, and areal extent of this mineralizing event. Techniques included reflected light petrographic, 40Ar/39Ar step-heating, stable isotope, fire assay, Mossbauer spectroscopy, electron microprobe, and scanning ion mass spectroscopy analysis. Results suggest ages between 85 Ma and 107 Ma with a 0 to 2 million-year differential between magmatic biotite and hydrothermal veins in the same deposits. Deposits are 10 t0 20 million years younger than local metamorphism. Fluid calculated stable isotopic ratios (ð13C = -9 to -10 per mil; ð18O = 5-10 per mil; ðD = -47 to -100; ð34S = -5 to +5 per mil) suggest gold precipitated from magmatic fluids. Fluid inclusions in ore-bearing quartz contain high CO2 with trapping temperatures and pressures of 270 ̊to 570C̊ and 0.5 to 2 kb respectively. The Fort Knox and Pogo deposits have a strong Au-Bi association and high relative amounts of potassic and albitic alteration with mineralogical evidence for the original existence of maldonite (Au2Bi) or Au-Bi melt subsequently overprinted by native gold + bismuthinite. The True North deposit has a strong Au-As association and no Au-Bi association. It lacks potassic or albitic alteration and contains only sub-micron gold; approximately half chemically bound to arsenopyrite or arsenian pyrite. The Dolphin and Ryan Lode deposits are intermediate in Au-Bi association, gold-associative mineralogy and alteration features. Arsenopyrite geothermometry yield temperatures between 300 ̊and 630C̊ for albitic and potassic alteration and between 250 ̊and 420C̊ for sericitic alteration. 40Ar/39Ar dating and metal ratios suggest that gold mineralization is 1) solely mid-Cretaceous in the Fairbanks mining district, 2) mid-Cretaceous and late Cretaceous in the Kantishna mining district, and 3) mid-Cretaceous and early Tertiary in the Livengood mining district"--Leaves iii-iv.

Download or read book Canadian Journal of Earth Sciences written by and published by . This book was released on 2002 with total page 878 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Publications Catalog of the Division of Geological Geophysical Surveys written by Alaska. Division of Geological and Geophysical Surveys and published by . This book was released on 1996 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Plutonism in the Central Part of the Sierra Nevada Batholith California written by Paul C. Bateman and published by . This book was released on 1992 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of the structure, composition, and pre-Tertiary history of the Sierra Nevada batholith in the Mariposa 1 by 2 quadrangle.

Download or read book Digital Files of Geochemical Analyses of Plutonic Rocks in East central Interior Alaska Compiled from Published Sources written by L. E. Burns and published by . This book was released on 1993 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: