Oceanic spreading center–hotspot interactions: Constraints from along-isochron bathymetric and gravity anomalies

Research Article| July 01, 1995 Oceanic spreading center–hotspot interactions: Constraints from along-isochron bathymetric and gravity anomalies Garrett Ito; Garrett Ito 1Woods Hole Oceanographic Institution–Massachusetts Institute of Technology Joint Program in Oceanography, Woods Hole, Massachusetts 02543 Search for other works by this author on: GSW Google Scholar Jian Lin Jian Lin 2Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543 Search for other works by this author on: GSW Google Scholar Author and Article Information Garrett Ito 1Woods Hole Oceanographic Institution–Massachusetts Institute of Technology Joint Program in Oceanography, Woods Hole, Massachusetts 02543 Jian Lin 2Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1995) 23 (7): 657–660. https://doi.org/10.1130/0091-7613(1995)023<0657:OSCHIC>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Garrett Ito, Jian Lin; Oceanic spreading center–hotspot interactions: Constraints from along-isochron bathymetric and gravity anomalies. Geology 1995;; 23 (7): 657–660. doi: https://doi.org/10.1130/0091-7613(1995)023<0657:OSCHIC>2.3.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 SocietyGeology Search Advanced Search Abstract We analyzed bathymetric and gravity anomalies along present and paleoaxes of oceanic spreading centers influenced by the Iceland, Azores, Galápagos, Tristan, and Easter hotspots. Residual bathymetry (up to 4.7 km) and mantle Bouguer gravity (up to −340 km) anomalies are maximum at on-axis hotspots and decrease with increasing ridge-hotspot separation distance (D), until becoming insignificant at D ∼500 km. Along-isochron widths of bathymetric anomalies (up to 2700 km) depend inversely on paleo–spreading rate, reflecting the extent to which plume material will flow along axis before being swept away by the spreading lithosphere. Flux balance arguments suggest that the five hotspots feed material to ridges with comparable fluxes of ∼2.2 × 106 km3/m.y. Assuming that the amplitudes of these geophysical anomalies reflect temperature-dependent crustal thickness and mantle density variations, we suggest that ridge temperature anomalies are maximum (150–225 ° C) when plumes are ridge centered and decrease with increasing ridge-hotspot distance due to cooling of the ridgeward-migrating plume material. 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.