{"refrec":{"BRefID":77951,"RR":"<b>Stakes, D.; Vanko, D.A.</b> (1986). Multistage hydrothermal alteration of gabbroic rocks from the failed Mathematician Ridge. <i>Earth Planet. Sci. Lett. 79(1-2)</i>: 75-92. <a href=\"https://dx.doi.org/10.1016/0012-821X(86)90042-7\" target=\"_blank\">https://dx.doi.org/10.1016/0012-821X(86)90042-7</a>","BEntID":73485,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Earth Planet. Sci. Lett. 79(1-2)</i>: 75-92. <a href=\"https://dx.doi.org/10.1016/0012-821X(86)90042-7\" target=\"_blank\">https://dx.doi.org/10.1016/0012-821X(86)90042-7</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Stakes, D.; Vanko, D.A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Stakes, D.; Vanko, D.A.","Englishabstract":"Oxygen isotopic, mineralogical and fluid inclusion data are presented for fresh and hydrothermally altered gabbroic rocks from the failed Mathematician Ridge. The Mathematician Ridge, though initially a fast-spreading ridge presently has a deep central rift valley more typical of slow-spreading rifts. The inner rift walls expose rare plutonic rocks uncomplicated by proximity to deep large-offset fracture zones. Undeformed Mathematician Ridge gabbros preserve most of the original texture and phase compositions and have been only slightly mineralogically or isotopically modified by post-crystallization hydrothermal alteration. Metagabbros have been subjected to a pervasive ductile deformation and recrystallization to foliated rocks composed of aluminous amphibole, low-calcium plagioclase and ilmenite. 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