{"refrec":{"BRefID":77329,"RR":"Hamlyn, P.R.; Bonatti, E. (1980). Petrology of mantle-derived ultramafics from the Owen fracture zone, northwest Indian Ocean: implications for the nature of the oceanic upper mantle. Earth Planet. Sci. Lett. 48(1): 65-79. https://dx.doi.org/10.1016/0012-821X(80)90171-5","BEntID":72934,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". Earth Planet. Sci. Lett. 48(1): 65-79. https://dx.doi.org/10.1016/0012-821X(80)90171-5","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Hamlyn, P.R.; Bonatti, E.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Hamlyn, P.R.; Bonatti, E.","Englishabstract":"An anomalous topographic high located 40 km southwest of the intersection of the Owen fracture zone with the Mid-Indian (Carlsberg) Ridge exposes mantle-derived ultramafic rocks for a vertical thickness of over 2 km. The rocks consist of partially serpentinized spinel lherzolite (ol 64%, opx 25%, cpx 9%, wp 2%) together with subordinate hatzburgite and rare dunite. Their coarse (protogranular) to porphyroclastic textures and mineral chemistry reveal a complex equilibration history and a strong resemblance to spinel lherzolite inclusions of the Cr-diopside group. Porphyroclastic olivine, enstatite and diopside have uniform composition irrespective of modal proportions and coexist with Al-rich spinel. Recrystallized pyroxenes exhibit lower Al2O3 and lower Di-En miscibility than porphyroclasts, consistent with partial subsolidus re-equilibration to lower T and P. Plagioclase, associated with a Cr-rich spinel, is a rare product of this subsolidus recrystallization and is indicative of final but incomplete equilibration within the plagioclase periodotite stability field. Textural relations of Al-rich spinel suggest an origin by two independent reactions. In the first association spinel occurs as coarse pyroxene-spinel clusters which may have formed from the breakdown of garnet during mantle upwelling beneath the Mid-Indian Ridge. In the second association spinel comprises part of the fine-grained recrystallized assemblage and probably formed via recrystallization of Al-rich pyroxene to Al-poor pyroxene.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Petrology of mantle-derived ultramafics from the Owen fracture zone, northwest Indian Ocean: implications for the nature of the oceanic upper mantle","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-01 01:31:14.999613","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1980,"MonPub":null,"DateUpdate":"2020-10-16","DateCreate":"2005-10-21","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:A1980KC74500009","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/0012-821X(80)90171-5"},"refs":null,"anarec":{"AnaID":77329,"PubliDate":1980,"Pagination":"65-79","XtraPublOfAnaID":null,"ISBN":null,"Volume":"48","Issue":"1","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42615,"SerRR":"Earth and Planetary Science Letters. Elsevier: Amsterdam. ISSN 0012-821X; e-ISSN 1385-013X","StandardTitleSer":"Earth and Planetary Science Letters","ISSN":"0012-821X","AbbrevSer":"Earth Planet. Sci. Lett.","StandardTitleMon":null,"StartPage":65,"Pages":15,"ToPubliDate":null,"BRefBibLvlCode":"S","SerNotes":null},"monrec":null,"serrec":null,"relations":null,"relationsRev":null,"addrec":{"Line1":"Palisades","Email":null,"Line2":null,"EnvName":"USA"},"othpubs":null,"ownerships":null,"authors":[{"AutName":"Hamlyn","Firstname":"Paul R.","Initials":"P.R.","Affiliation":null,"Discriminator":null,"CorporateFlag":0,"BEntID":72934,"AutID":55944,"OrderNr":1,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":null,"ORCID":null,"PersID":null,"InsID":null},{"AutName":"Bonatti","Firstname":"Enrico","Initials":"E.","Affiliation":null,"Discriminator":null,"CorporateFlag":0,"BEntID":72934,"AutID":21085,"OrderNr":2,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":null,"ORCID":null,"PersID":null,"InsID":null}],"mapdetails":null,"datasets":null,"monographs":null,"monparts":null,"serparts":null,"BEntOpen":null,"BEntPrivate":null,"availability":[{"BInstID":352578,"LibID":36,"BRefID":77329,"EmbargoDate":null,"FullEmbargoDate":null,"PhysMedID":16,"hasOCRd":null,"ShelfLocCode":"352578","RFID":null,"PaidValue":null,"Medium":"Server","Description":"Interne VLIZ documenten","Acronym":"VLIZ","Library":"Vlaams Instituut voor de Zee","DutchTerm":"Non-open access","URL":null,"ClassifID":228,"Classification":"Non-open access","ReqLink":1,"ClassifTypID":3,"URLLocation":"https://www.vliz.be/imisdocs/publications/","SubDir":1,"InternalReq":1,"LoggedInReq":1,"Disclaimer":"Disclaimer_VLIZ_Intern","DutchDisclaimer":"
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