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Age of the Los Ranchos Formation, Dominican Republic: Timing and tectonic setting of primitive island arc volcanism in the Caribbean region

2005; Geological Society of America; Volume: 117; Issue: 7 Linguagem: Inglês

10.1130/b25594.1

1943-2674

Stephen E. Kesler, I. H. Campbell, Charlotte M. Allen,

earthquake and tectonic studies

Research Article| July 01, 2005 Age of the Los Ranchos Formation, Dominican Republic: Timing and tectonic setting of primitive island arc volcanism in the Caribbean region Stephen E. Kesler; Stephen E. Kesler 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA Search for other works by this author on: GSW Google Scholar Ian H. Campbell; Ian H. Campbell 2Research School of Earth Sciences, Australian National University, Canberra, A.C.T. 0200, Australia Search for other works by this author on: GSW Google Scholar Charlotte M. Allen Charlotte M. Allen 3Research School of Earth Sciences, Australian National University, Canberra, A.C.T. 0200, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information Stephen E. Kesler 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA Ian H. Campbell 2Research School of Earth Sciences, Australian National University, Canberra, A.C.T. 0200, Australia Charlotte M. Allen 3Research School of Earth Sciences, Australian National University, Canberra, A.C.T. 0200, Australia Publisher: Geological Society of America Received: 19 Feb 2004 Revision Received: 07 Feb 2005 Accepted: 13 Feb 2005 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2005) 117 (7-8): 987–995. https://doi.org/10.1130/B25594.1 Article history Received: 19 Feb 2004 Revision Received: 07 Feb 2005 Accepted: 13 Feb 2005 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Stephen E. Kesler, Ian H. Campbell, Charlotte M. Allen; Age of the Los Ranchos Formation, Dominican Republic: Timing and tectonic setting of primitive island arc volcanism in the Caribbean region. GSA Bulletin 2005;; 117 (7-8): 987–995. doi: https://doi.org/10.1130/B25594.1 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 This study reports U-Pb ages for zircons from the Los Ranchos Formation, which is part of the primitive island arc sequence, the oldest volcanic rocks in the Greater Antilles. Zircons were analyzed from three samples: quartz porphyry (quartz keratophyre) from the lower part of the formation (Quita Sueño Member), fragmental quartz porphyry from the upper part of the formation (Pueblo Viejo Member), and the Cotui quartz diorite stock that intrudes the lower part of the formation. The lower part of the Los Ranchos Formation, represented by the Quita Sueño sample, formed at either 113.9 ± 0.8 or 118.6 ± 0.5 Ma depending on interpretation of the data, whereas the upper part, represented by the Pueblo Viejo sample, formed ca. 110.9 ± 0.8 Ma. The Cotui stock (RD-73-601) was emplaced ca. 111.8 ± 0.6 Ma or 112.9 ± 0.9 Ma depending on whether eight grains reflect subtle inheritance. These results show that the Los Ranchos Formation was emplaced during the Aptian-Albian transition, that the Cotui stock could have supplied magma to the volcanic sequence and fluids to the Pueblo Viejo gold-silver deposit in the upper part of the formation, and that carbonaceous sediments in the upper part of the formation formed at the same time as ocean anoxic event 1b (Paquier). Caribbean plate tectonic models involving invasion of anomalous Pacific crust into the Caribbean region appear to agree best with this age because they provide a mechanism for the change from primitive island arc (PIA) to calcalkaline magmatism and account for the restricted ocean circulation necessary to generate regional anoxic conditions. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.