Research Article| March 01, 2012 Rhenium-osmium isotope systematics and platinum group element concentrations in oceanic crust Bernhard Peucker-Ehrenbrink; Bernhard Peucker-Ehrenbrink 1Woods Hole Oceanographic Institution, 360 Woods Hole Road, MS 25, Woods Hole, Massachusetts 02543-1541, USA Search for other works by this author on: GSW Google Scholar Karen Hanghoj; Karen Hanghoj 1Woods Hole Oceanographic Institution, 360 Woods Hole Road, MS 25, Woods Hole, Massachusetts 02543-1541, USA2Lamont-Doherty Earth Observatory at Columbia University, 61 Route 9W, PO Box 1000, Palisades, New York 10964-8000, USA Search for other works by this author on: GSW Google Scholar Tracy Atwood; Tracy Atwood 1Woods Hole Oceanographic Institution, 360 Woods Hole Road, MS 25, Woods Hole, Massachusetts 02543-1541, USA Search for other works by this author on: GSW Google Scholar Peter B. Kelemen Peter B. Kelemen 1Woods Hole Oceanographic Institution, 360 Woods Hole Road, MS 25, Woods Hole, Massachusetts 02543-1541, USA2Lamont-Doherty Earth Observatory at Columbia University, 61 Route 9W, PO Box 1000, Palisades, New York 10964-8000, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Bernhard Peucker-Ehrenbrink 1Woods Hole Oceanographic Institution, 360 Woods Hole Road, MS 25, Woods Hole, Massachusetts 02543-1541, USA Karen Hanghoj 1Woods Hole Oceanographic Institution, 360 Woods Hole Road, MS 25, Woods Hole, Massachusetts 02543-1541, USA2Lamont-Doherty Earth Observatory at Columbia University, 61 Route 9W, PO Box 1000, Palisades, New York 10964-8000, USA Tracy Atwood 1Woods Hole Oceanographic Institution, 360 Woods Hole Road, MS 25, Woods Hole, Massachusetts 02543-1541, USA Peter B. Kelemen 1Woods Hole Oceanographic Institution, 360 Woods Hole Road, MS 25, Woods Hole, Massachusetts 02543-1541, USA2Lamont-Doherty Earth Observatory at Columbia University, 61 Route 9W, PO Box 1000, Palisades, New York 10964-8000, USA Publisher: Geological Society of America Received: 10 May 2011 Revision Received: 20 Sep 2011 Accepted: 28 Sep 2011 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2012 Geological Society of America Geology (2012) 40 (3): 199–202. https://doi.org/10.1130/G32431.1 Article history Received: 10 May 2011 Revision Received: 20 Sep 2011 Accepted: 28 Sep 2011 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Bernhard Peucker-Ehrenbrink, Karen Hanghoj, Tracy Atwood, Peter B. Kelemen; Rhenium-osmium isotope systematics and platinum group element concentrations in oceanic crust. Geology 2012;; 40 (3): 199–202. doi: https://doi.org/10.1130/G32431.1 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 SocietyGeology Search Advanced Search Abstract Knowledge of the 187Os/188Os ratio as well as the inventories of rhenium and platinum group elements (PGE) in oceanic crust allows quantification of the proportion of recycled oceanic crust in oceanic basalt sources. Our knowledge is limited by the availability of well-characterized sections of oceanic crust, specifically of the plutonic, lower portion that has not been drilled in situ to the Moho. Here we report new data for plutonic rocks that compose the bottom 4680 m of an ocean crust section from the Oman ophiolite. Major and trace element data as well as mineral analyses indicate that Oman gabbros are primitive cumulates from melts similar to typical mid-oceanic ridge basalt. The mean weighted composition of this section (Re: 427 pg/g; Os: 55 pg/g; Ir: 182 pg/g; Pd: 2846 pg/g; Pt: 4151 pg/g; initial 187Os/188Os: 0.142) indicates significantly higher Os and lower Re concentrations than previously analyzed partial sections of ocean crust that lack cumulate lower crust [Deep Sea Drilling Project–Ocean Drilling Program (DSDP-ODP) Hole 504B, ODP Hole 735B], emphasizing that the lower, cumulate oceanic crust dominates the Os budget of oceanic crust. Analyses of mineral grain size fractions indicate that rhenium, PGE, and lead are enriched in the sulfur-rich, fine fraction. This corroborates the notion that small accessory phases, and the melt migration processes affecting them, control these elements' budgets, distributions, and susceptibilities to alteration. The Re-Os-PGE inventories of a hypothetical 6.5-km-thick composite section that consists of 1825 m of DSDP Hole 504B−like upper oceanic crust and 4680 m of Oman-like lower ocean crust (Re: 736 pg/g; Os: 45 pg/g; Ir: 133 pg/g; Pd: 2122 pg/g; Pt: 2072 pg/g; initial 187Os/188Os: 0.146) provide a new comprehensive assessment of oceanic crust composition. Upon recycling and mixing with reasonable proportions of mantle peridotite, this composite requires at least 2 G.y. to develop sufficiently radiogenic 187Os/188Os to generate high μ (HIMU: μ = 238U/204Pb) basalts. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.