Transportation and deposition of heavy mineral

Research Article| December 01, 1943 Transportation and deposition of heavy mineral GORDON RITTENHOUSE GORDON RITTENHOUSE Search for other works by this author on: GSW Google Scholar Author and Article Information GORDON RITTENHOUSE Publisher: Geological Society of America Received: 18 May 1943 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 1943 Geological Society of America GSA Bulletin (1943) 54 (12): 1725–1780. https://doi.org/10.1130/GSAB-54-1725 Article history Received: 18 May 1943 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation GORDON RITTENHOUSE; Transportation and deposition of heavy mineral. GSA Bulletin 1943;; 54 (12): 1725–1780. doi: https://doi.org/10.1130/GSAB-54-1725 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 An attempt to use heavy minerals to evaluate sediment sources in the Middle Rio Grande Valley showed the inadequacy of commonly used methods of representing heavy-mineral compositions. To develop a usable method, six samples from a transverse channel section were studied by quantitative methods. The size-distribution curves (by weight) of 12 heavy minerals were similar in general form to those of the light minerals, but displaced toward the finer sizes. Among samples the heavy-mineral composition varied systematically with differences in average size and sorting of the light minerals.The size distribution of a heavy mineral in a fluvial deposit appears to depend on (1) its relative availability in each size grade in the stream load, (2) its equivalent hydraulic size, (3) the hydraulic conditions at the time and place of deposition, and (4) some factor or factors now unknown. In the Rio Grande, the equivalent hydraulic sizes of 16 heavy minerals vary from 1.0ϕ to .2ϕ.The hydraulic ratio is recommended as a genetically sound method of representing the heavy-mineral composition of sediments. This ratio is the same in the stream load and bed deposits. Changes in the hydraulic ratio caused by wear, selective transportation, and other factors are discussed.Other methods of representing heavy-mineral compositions are discussed and their limitations outlined. All methods are of limited applicability, but ratios between heavies of about the same specific gravity may be used most extensively. If the limitations are not observed, invalid conclusions may be reached. This content is PDF only. Please click on the PDF icon to access. 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.