https://bereket-haileab.geology.sites.carleton.edu/files/original/175e5be3bd989868c6155f2376517c04.jpg 9f98f2159616583a5373aaff8e287853 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 and hand sample 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 BH250-187 Subject The topic of the resource Basalt (North Shore Basalt from Taylors Falls, Minnesota) Description An account of the resource Major Minerals: plagioclase, clinopyroxene, iron oxides <p data-start="106" data-end="467">BH250-187 is a basalt sample exposed at Taylors Falls, part of the North Shore Volcanic Group (NSVG)—a thick sequence of volcanic rocks formed during the Midcontinent Rift event, a major rifting episode that took place approximately 1.1 billion years ago during the Mesoproterozoic Era.</p> <p data-start="469" data-end="498">Major minerals include:</p> <ul data-start="499" data-end="610"> <li data-start="499" data-end="527"> <p data-start="501" data-end="527">Plagioclase feldspar</p> </li> <li data-start="528" data-end="567"> <p data-start="530" data-end="567">Clinopyroxene (commonly augite)</p> </li> <li data-start="568" data-end="610"> <p data-start="570" data-end="610">Orthopyroxene (commonly enstatite)</p> </li> </ul> <p data-start="612" data-end="752">These basalts typically exhibit ophitic to intergranular textures, where plagioclase laths are enclosed by or intergrown with pyroxenes.</p> <p data-start="754" data-end="916">Geochemically, this basalt plots in the tholeiitic field characterized by low alkali content and relatively high concentrations of iron and magnesium.</p> <p data-start="918" data-end="1105">Lava flows in the area range from massive to vesicular, often showing amygdaloidal textures, where gas vesicles have been filled with secondary minerals such as quartz or calcite.</p> <p data-start="1107" data-end="1442">The basalt is well-exposed in Interstate State Park, where it forms the bedrock beneath a landscape shaped by Quaternary glaciations, including dramatic glacial potholes. Some flow layers show flow banding, vesicle-rich zones, and oxidized tops, indicating subaerial eruption and weathering between flow events.</p> <br /><iframe width="1800" height="100" src="https://docs.google.com/spreadsheets/d/e/2PACX-1vS4nyqCmZQGn3t6vX4g4nhDPwHMBaKrigt1LaY2pykWbBGXB1wNb6FYArx625I-JTtD7lyg4uz1OS1r/pubhtml?gid=1456476804&amp;single=true&amp;widget=true&amp;headers=false"></iframe> Coverage The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant Location: Taylors Falls, Minnesota, USA Nearby Geographic Feature: St. Croix River GPS Coordinates: 45°23'58.01"N, 92°39'5.89"W Source A related resource from which the described resource is derived From the rock collection of Bereket Haileab. Sample BH250-187. Housed at Carleton College in Minnesota. Type The nature or genre of the resource Hand sample and 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=05ff696b83214ca8951fa4db7a8b4b78" 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=05ff696b83214ca8951fa4db7a8b4b78">here</a><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/11dli0nnKYf3ZCxldxqCI_NUz82jfhv3n/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1K_ie0985jjYbhqwbX_vJFnUjVcGf5z1Y/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1CiJMtXIwuyG7pFY-A4vd26qTelNBFNxs/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1rgRV1hkC2O51iMZF25DOjLUb_Ud6kcmD/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/18XbMP2zNkRJ9lorjzZGLGUaqMtiK0MvM/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1FNGjFxjGkxpFRLtYrkjWkiX5IMtv2OWb/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/15eZ1TQCC9OTiXlOCsLZTJjAytUaPTICC/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1I9Tu78-rNVntwv_wdikB4BIMiQOWHaE3/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1EIwQsKG3qb12mVK8vXSLsjul5HKcuFzl/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1OiL2avECTnx-LalGCr33D264EiIb1EOH/preview" allow="autoplay"></iframe><br />TAS diagram of sample BH250-187. Creator An entity primarily responsible for making the resource Bereket Haileab basalt Glacial Potholes igneous Interstate State Park mafic Midcontinent Rift North Shore Volcanic Group ophitic texture Taylors Falls Tholeiitic Basalt volcanic