https://bereket-haileab.geology.sites.carleton.edu/files/original/92877552422ba7aed4858acf41015fdf.jpg a27ffe18a73f4ffbf4061bf5ddbfa6d0 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 Igneous Rocks Subject The topic of the resource This collection covers both volcanic and intrusive rocks, including rhyolites, granites, diorites, andesites, basalts, gabbros, diabases, pumices, obsidians, syenites, phonolites, peridotites, carbonatites, dacites, trachyte, dunites, xenoliths, ignimbrites, and pegmatites. 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 BH250-114 Subject The topic of the resource Basaltic andesite Description An account of the resource Major Minerals: plagioclase, clinopyroxene, orthopyroxene <br />Minor Mineral: chlorite <br /><br /> <p>BH250-114 chemically plots in the basaltic andesite field on a TAS (Total Alkali-Silica) diagram. Basaltic andesite is an intermediate volcanic rock that bridges the compositional gap between basalt and andesite. It plays a significant role in igneous petrology, particularly in subduction-related volcanic arcs.</p> <p>This rock type is characterized by an intermediate silica content, typically ranging from 52–57 wt% SiO₂—richer in silica than basalt, but less than true andesite. Other key chemical features include moderate alkali levels and variable magnesium and iron contents, reflecting processes like fractional crystallization and magma mixing.</p> <p>Sample BH250-114 exhibits a fine-grained (aphanitic) texture, consistent with rapid cooling at or near the Earth’s surface. This texture, along with its chemistry, supports its classification as a basaltic andesite and highlights its origin from a volcanic arc tectonic setting.</p> <br /><br /><iframe width="1800" height="100" src="https://docs.google.com/spreadsheets/d/e/2PACX-1vS4nyqCmZQGn3t6vX4g4nhDPwHMBaKrigt1LaY2pykWbBGXB1wNb6FYArx625I-JTtD7lyg4uz1OS1r/pubhtml?gid=1792415072&amp;single=true&amp;widget=true&amp;headers=false"></iframe> Date A point or period of time associated with an event in the lifecycle of the resource Summer 2012 Source A related resource from which the described resource is derived From the rock collection of Bereket Haileab. Sample 114. 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=100931ef44d74999bf60a14e9bdbb05e" 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=100931ef44d74999bf60a14e9bdbb05e">here</a><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1FhD3RMjs29JNXhHEf7RNn_dbgnJDMfnG/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/11t0oSIRO81qw2XmtfeBLZRYHHdc5rmhe/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1nF1lENixwXl6I9D7zyekj7v6mNBnBQaU/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1r99hscj6jB01xomlssaubKYDkEvWxYBA/preview" allow="autoplay"></iframe><br />TAS diagram of sample BH250-114. Creator An entity primarily responsible for making the resource Bereket Haileab andesite Aphanitic Texture basalt Basaltic Andesite igneous Intermediate composition mafic volcanic Volcanic rock