Coesite inclusions in dolomite from eclogite in the southern Dabie Mountains, China; the significance of carbonate minerals in UHPM rocks

Other| February 01, 1996 Coesite inclusions in dolomite from eclogite in the southern Dabie Mountains, China; the significance of carbonate minerals in UHPM rocks R. Y. Zhang; R. Y. Zhang Stanford University, Department of Geological and Environmental Sciences, Stanford, CA, United States Search for other works by this author on: GSW Google Scholar J. G. Liou J. G. Liou Search for other works by this author on: GSW Google Scholar American Mineralogist (1996) 81 (1-2): 181–186. https://doi.org/10.2138/am-1996-1-222 Article history first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation R. Y. Zhang, J. G. Liou; Coesite inclusions in dolomite from eclogite in the southern Dabie Mountains, China; the significance of carbonate minerals in UHPM rocks. American Mineralogist 1996;; 81 (1-2): 181–186. doi: https://doi.org/10.2138/am-1996-1-222 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentBy SocietyAmerican Mineralogist Search Advanced Search Abstract Coesite inclusions have been discovered in dolomite from carbonate-bearing eclogite in the Dabie UHP terrane. The eclogite boudins are enclosed in calc-silicate rocks that contain quartz aggregates after coesite in the matrix. The carbonate-bearing eclogite is composed of garnet, coesite or quartz, dolomite, magnesite, omphacite, rutile, ±minor phengite, apatite, and zircon, and was formed at ∼760 °C, >28 kbar, and 0.01 < XCO2 <0.1. In addition to coesite inclusions in dolomite, inclusions of coesite and quartz pseudo-morphs after coesite are abundant in garnet. One inclusion of quartz + calcite aggregates after coesite and aragonite (?) was identified in garnet. Radial fractures developed in garnet around the coesite inclusions but are absent in the dolomite. Dolomite contains about 14 mol% ankerite component, whereas magnesite contains about 2 mol% calcite and 23 mol% siderite. This is the first reported occurrence of coexisting magnesite + dolomite + possible aragonite + coesite in a single eclogitic sample and is consistent with experimentally determined stabilities of these phases at mantle conditions. Systematic mineral parageneses of eclogite, marble, and country-rock gneisses support the previous conclusion that supracrustal rocks were subducted to mantle depths of >100 km. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article.