caa a22 4500 46579114X CHVBK 20180323112025.0 cr unu---uuuuu 170327e19900401xx s 000 0 eng 10.1007/BF00306662 doi (NATIONALLICENCE)springer-10.1007/BF00306662 Serpentinization of phlogopite phenocrysts from a micaceous kimberlite [Elektronische Daten] [Thomas Sharp, Max Otten, Peter Buseck] Phenocrysts of phlogopite from a micaceous kimberlite contain finely interlayered serpentine. These phenocrysts occur in the kimberlite groundmass and are altered along the mica layers and are slightly deformed. Lizardite is the predominant serpentine mineral, but chrysotile and mixed structures also occur. The lizardite occurs as lamellae within phlogopite, oriented such that (001) layers of the two minerals are parallel and the [100] direction of lizardite is parallel to the [100] or 〈110〉 directions of phlogopite. The serpentinized regions of phlogopite are localized and extensive along the (001) layers. Chrysotile fibers and chrysotile-like curled serpentine occur within regions of disrupted material, and polygonal structures occur in folded lizardite lamellae. Textural relations suggest three events: 1) replacement of phlogopite by lizardite, 2) deformation of the phenocrysts, and 3) partial transformation of the lizardite to chrysotile-like structures. Deformation features include openings along (001), folds, and regions of disrupted or broken material. The folded and broken material consists of lamellar lizardite and phlogopite, indicating that lamellar replacement preceded deformation. Intergrowths of lizardite and curled serpentine are associated with cleavage openings and voids in disrupted material, suggesting that a partial transformation of lizardite to chrysotile occurred within openings created by deformation. Clay minerals also occur within phlogopite as either a minor product of serpentinization or of late-stage alteration. Springer-Verlag, 1990 Sharp Thomas Department of Geology, Arizona State University, 85287, Tempe, AZ, USA aut Otten Max Philips Analytical Electron Optics Applications Laboratory, Building AAE, NL-5600, Eindhoven, The Netherlands aut Buseck Peter Department of Geology, Arizona State University, 85287, Tempe, AZ, USA aut Contributions to Mineralogy and Petrology Springer-Verlag 104/5(1990-04-01), 530-539 0010-7999 104:5<530 1990 104 410 https://doi.org/10.1007/BF00306662 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00306662 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sharp Thomas Department of Geology, Arizona State University, 85287, Tempe, AZ, USA aut NATIONALLICENCE 700 1- Otten Max Philips Analytical Electron Optics Applications Laboratory, Building AAE, NL-5600, Eindhoven, The Netherlands aut NATIONALLICENCE 700 1- Buseck Peter Department of Geology, Arizona State University, 85287, Tempe, AZ, USA aut NATIONALLICENCE 773 0- Contributions to Mineralogy and Petrology Springer-Verlag 104/5(1990-04-01), 530-539 0010-7999 104:5<530 1990 104 410 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer