Precambrian salic intrusive rocks of the Reading Prong

Research Article| October 01, 1978 Precambrian salic intrusive rocks of the Reading Prong DAVIS A. YOUNG DAVIS A. YOUNG 1Department of Earth Sciences, University of North Carolina at Wilmington, Wilmington, North Carolina 28401 Search for other works by this author on: GSW Google Scholar Author and Article Information DAVIS A. YOUNG 1Department of Earth Sciences, University of North Carolina at Wilmington, Wilmington, North Carolina 28401 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1978) 89 (10): 1502–1514. https://doi.org/10.1130/0016-7606(1978)89<1502:PSIROT>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation DAVIS A. YOUNG; Precambrian salic intrusive rocks of the Reading Prong. GSA Bulletin 1978;; 89 (10): 1502–1514. doi: https://doi.org/10.1130/0016-7606(1978)89<1502:PSIROT>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 Approximately one-half of the Reading Prong consists of Precambrian salic intrusive igneous rocks, most of which are now metamorphosed. The intrusive rocks of the western Reading Prong and of the southeastern massif consist predominantly of gneissoid hornblende granite or hornblende granite gneiss. The rocks are relatively poor in clinopyroxene and mesoperthite content and relatively quartz-rich. In the northwestern massif, hornblende and clinopyroxene granite is common, but hornblende- or clinopyroxene-bearing syenitic and monzonitic rocks and their variants are equally abundant. These intrusive rocks are relatively enriched in clinopyroxene and mesoperthite and rather poor in quartz.Reconstruction of the geology of the Reading Prong suggests that the western Reading Prong and the southeastern massif were on strike prior to Paleozoic time. This reconstruction indicates the existence of two parallel intrusive rock belts during Precambrian time — a northwestern syenitic belt and a southeastern granitic belt.It is concluded that the syenitic and monzonitic rocks were generated mainly by very deep-level partial melting of quartzo-feldspathic and anorthositic rocks in a high-temperature, relatively anhydrous environment. A somewhat steeper geothermal gradient in the northwestern Reading Prong might account for the regional differences in intrusive rock distribution. 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.