GRANITIZATION AND HYDROTHERMAL ALTERATION AT BINGHAM, UTAH

Research Article| August 01, 1953 GRANITIZATION AND HYDROTHERMAL ALTERATION AT BINGHAM, UTAH BRONSON STRINGHAM BRONSON STRINGHAM DEPARTMENT OF MINERALOGY, UNIVERSITY OF UTAH, SALT LAKE CITY, UTAH Search for other works by this author on: GSW Google Scholar Author and Article Information BRONSON STRINGHAM DEPARTMENT OF MINERALOGY, UNIVERSITY OF UTAH, SALT LAKE CITY, UTAH Publisher: Geological Society of America Received: 13 Aug 1952 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1953, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1953) 64 (8): 945–992. https://doi.org/10.1130/0016-7606(1953)64[945:GAHAAB]2.0.CO;2 Article history Received: 13 Aug 1952 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation BRONSON STRINGHAM; GRANITIZATION AND HYDROTHERMAL ALTERATION AT BINGHAM, UTAH. GSA Bulletin 1953;; 64 (8): 945–992. doi: https://doi.org/10.1130/0016-7606(1953)64[945:GAHAAB]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The rocks exposed in the disseminated copper deposit at Bingham, Utah, consist of folded Pennsylvanian quartzites, limestones, and dolomites within which have been formed granite, actinolite syenite, granite porphyry with associated aplites, and biotite-quartz latite porphyry. Field and petrographic evidence shows that the granite porphyry and biotite-quartz latite porphyry are magmatic. That the granite and actinolite syenite may have been formed by granitization is strongly suggested by: (1) the presence of a microgranitic rock in the granite, recognized as being granitized quartzite, and (2) the replacement of quartzite by feldspar, observable only with the aid of the microscope, that occurs along the contact of the granite. Other chemical, textural, compositional, and other evidences support this hypothesis.The hydrothermal activity attending the ore deposition took place in seven stages following the formation of the igneous-appearing rocks. Except for the first two, which can be separated on good microscopic evidence, all stages can be differentiated by structural field relations. Stage I saw the formation of kaolinite and illite. During Stage II hydrothermal biotite and sericite were widely developed. In Stage III, chlorite and hydrothermal biotite were formed, but in restricted areas. In Stage IV, quartz and sericite formed over wide areas, while during Stare V quartz was deposited in open fissures without accompanying alteration. Stage VI is the sulfide stage, and Stage VII saw the development of sericite and allophane in open fissures. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.