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Origin of the Diamonds within Chromitite from the Mirdita Ophiolite(Albania) and its Geological Significance

Acta Geologica Sinica(English Edition) 2020年第S1期94卷 64-65页

作者： WU Weiwei YANG Jingsui ZHENG Jianping LIAN Dongyang QIU Tian RUI Huichao College of Marine Science and Technology China University of Geosciences(Wuhan)No.388 Lumo RoadWuhan 430074China CARMA Key Laboratory of Deep-Earth Dynamics of MLRInstitute of GeologyChinese Academy of Geological SciencesNo.26 Baiwanzhuang RoadBeijing 100037China School of Earth Sciences and Engineering Nanjing UniversityNanjing 210023China

Geophysical investigations and laboratory experiments show evidence for possible subduction of ancient oceanic *** and mineralogical observations suggest that subducted oceanic crust is recycled into the upper *** subduction is supported by the recovery of superdeep diamonds from kimberlites and the presence of crustal materials in ophiolitic chromitites and their host *** is the mechanism?Here we report the new discovery of ophiolite-hosted diamonds in the podiform chromitites within the Skenderbeu massif from the Mirdita ophiolite in the western part of Neo-Tethys(Fig.1).The diamonds are characterized by exceedingly light C isotopes(δ13CPDB^-25‰),which can be interpreted as evidence for subduction of organic carbon from Earth’s *** diamonds are also characterized by an exceptionally large range inδ15Nair(-12.9‰to+25.5‰),accompanied by a low N aggregation state(Fig.2).On the other hand,materials sparsely included in diamonds include amorphous material,Ni-Mn-Co alloy,nanocrystals(20 nm×20 nm)of calcium silicate with an orthorhombic perovskite structure(Ca-Pv),and fluids(Fig.3).We consider that the Skenderbeu diamonds nucleated and grew from a C-saturated,NiMnCo-rich melt derived from a subducted slab of ocean crust and lithosphere in the deep mantle *** environment is in the diamond stability field or near the top of the mantle transition *** new discovery of diamonds from the Mirdita ophiolite provides a valuable opportunity to understand deep cycling of subducted oceanic crust and mantle(i.e.,composition and process).

关键词： Mirdita ophiolite diamond NiMnCo alloy calcium silicate perovskite carbon and nitrogen isotopes subduction West Albania

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