Portal de Periódicos da CAPES

PETROLOGY OF GRANOPHYRE IN DIABASE NEAR DILLSBURG, PENNSYLVANIA

1953; Geological Society of America; Volume: 64; Issue: 6 Linguagem: Inglês

10.1130/0016-7606(1953)64[675

1943-2674

Preston Enslow Hotz,

Geochemistry and Geologic Mapping

Research Article| June 01, 1953 PETROLOGY OF GRANOPHYRE IN DIABASE NEAR DILLSBURG, PENNSYLVANIA PRESTON E HOTZ PRESTON E HOTZ U. S. GEOLOGICAL SURVEY, ROOM 208, 222 S., WEST TEMPLE ST., SALT LAKE CITY 1, UTAH Search for other works by this author on: GSW Google Scholar Author and Article Information PRESTON E HOTZ U. S. GEOLOGICAL SURVEY, ROOM 208, 222 S., WEST TEMPLE ST., SALT LAKE CITY 1, UTAH Publisher: Geological Society of America Received: 20 May 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 (6): 675–704. https://doi.org/10.1130/0016-7606(1953)64[675:POGIDN]2.0.CO;2 Article history Received: 20 May 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 PRESTON E HOTZ; PETROLOGY OF GRANOPHYRE IN DIABASE NEAR DILLSBURG, PENNSYLVANIA. GSA Bulletin 1953;; 64 (6): 675–704. doi: https://doi.org/10.1130/0016-7606(1953)64[675:POGIDN]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 Small bodies of granophyre occur in the upper part of diabase bodies of Triassic age in southeastern Pennsylvania. One near Harrisburg was penetrated by a diamond-drill. Drill core specimens show a gradation from diabase to granophyre.New data include 10 chemical analyses, spectrographic determinations of trace elements, and the results of petrographic study of specimens from the drill core. The sequence, from diabase to granophyre, includes a chilled zone that represents an original magma of tholeiitic composition, normal diabase, pegmatitic facies of diabase, and granophyric diabase that is intermediate in composition and petrographic characteristics between diabase and granophyre, and finally granophyre. Alkalies and silica increase progressively from diabase to granophyre; iron increases to a maximum in transitional granophyric diabase, then decreases in the granophyre.It is concluded that crystal fractionation in a large sheetlike body of tholeiitic magma yielded a small amount of granophyre. Prior to complete solidification, a residual liquid rich in iron, alkalies, and silica accumulated locally in the upper part of the diabase sheet. In places volatile-rich iron-bearing solutions escaped into the overlying sedimentary rocks and deposited magnetite; the remaining liquid crystallized t o fine-grained granophyre. 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.