https://bereket-haileab.geology.sites.carleton.edu/files/original/767acb0d5f6fe328bbf43e682a2a01c5.jpg ac047440ccee8e066650aa587aeed880 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Metamorphic Rocks Subject The topic of the resource This collection includes slates, phyllites, schists, gneisses, eclogites, marbles, quartzites, skarns, granulites, and mylonites. Creator An entity primarily responsible for making the resource Bereket Haileab Source A related resource from which the described resource is derived Housed in Anderson Hall, Carleton College. Format The file format, physical medium, or dimensions of the resource Thin sections, thin section scans, hand samples, hand sample images, photomicrographs, chemical analyses (major elements, trace elements and REE analyses for selected samples). Thin section Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource BH250-10 Subject The topic of the resource Garnet Sillimanite Schist Description An account of the resource Major Minerals: garnet, sillimanite, quartz Minor Mineral: biotite, orthoclase, plagioclase Garnet sillimanite schist is a medium to high-grade metapelitic rock that forms under amphibolite to granulite facies metamorphic conditions. It is derived from aluminous shale or mudstone protoliths and reflects deep crustal metamorphism. In this sample, the major minerals are: Garnet – Large, porphyroblastic, now deformed Sillimanite – Typically occurs as fibrolite or prismatic needles Quartz – Forms the matrix and reflects metamorphic recrystallization Minor minerals: Biotite – Aligned in the foliation, contributes to schistosity Orthoclase and Plagioclase – Present as felsic phases, possibly from original sediment or late-stage metamorphic reaction Microstructure & Deformation: Porphyroblastic garnets are described as prograde and pre-kinematic they grew before the main deformation event and were subsequently deformed, suggesting syn- to post-tectonic strain after garnet crystallization. These garnets now exhibit strain shadows, pressure solution features, or boudinage, indicative of deformation during peak or retrograde metamorphism. Sillimanite are present as fibrolite along foliation planes, reflecting high-temperature metamorphism. Metamorphic Significance: The garnet + sillimanite + quartz ± feldspar assemblage places this rock within the upper amphibolite to granulite facies, and its mineralogy is consistent with pelitic bulk composition. Source A related resource from which the described resource is derived From the rock collection of Bereket Haileab. Sample 10. Housed at Carleton College in Minnesota. Type The nature or genre of the resource Thin section Relation A related resource <iframe width="100%" height="600" style="border: 0;" src="https://carleton.maps.arcgis.com/apps/instant/media/index.html?appid=48dc06b1360c410fbc13ced065448ab3" frameborder="0" allowfullscreen="allowfullscreen">iFrames are not supported on this page.</iframe><br />View on ArcGIS Online <a href="https://carleton.maps.arcgis.com/home/item.html?id=48dc06b1360c410fbc13ced065448ab3">here</a><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1xcob7AzB2BmD7VBRYqKP1yztLbz7ck-R/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1XYBPoibbVezQiVGHvBrAM4wf_XmpDpcR/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1ZyyuLNVzsmzCH-_RtYbu08RfFu6BDlVb/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/19IyP78jbyaG5B4RyOQqmkbQ_12KmaGAf/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1w_fVtBGuqIo3UV1yljMP62b56A2amykz/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1v3rhFuG6aGQTT-8Hzyzn_Ll9w1uwZ7Ns/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1stHfnCglJImTGfPBLBHNM44-OXOSlT6t/preview" allow="autoplay"></iframe> Creator An entity primarily responsible for making the resource Bereket Haileab Aluminous protolith Amphibolite Facies Fibrolite Garnet Garnet sillimanite schist granulite facies metamorphic Metapelite porphyroblastic Pre-Kinematic Garnet schist sillimanite