https://bereket-haileab.geology.sites.carleton.edu/files/original/39853dc017e57b7a3f7082142743f0f7.jpg c4ca1b81934baaca358d47d6b5c8bfd9 https://bereket-haileab.geology.sites.carleton.edu/files/original/040c796957fc88d4f44ea2ff6c59c7c9.jpg c4ca1b81934baaca358d47d6b5c8bfd9 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). 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 BH250-250 Subject The topic of the resource Basalt Coverage The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant East Pacific Rise, recovered by HOV Alvin at 2500 m depth Creator An entity primarily responsible for making the resource Bereket Haileab Source A related resource from which the described resource is derived From the rock collection of Bereket Haileab. Sample 250. Housed at Carleton College in Minnesota. Publisher An entity responsible for making the resource available Bereket Haileab Type The nature or genre of the resource Hand sample Description An account of the resource Mid-oceanic ridge basalt (MORB) from East Pacific Rise, showing glassy, basalt and a chilled margin. Petrologic and Mantle Significance: This mid-ocean ridge basalt (MORB) from the East Pacific Rise represents the dominant volcanic rock type forming the oceanic crust at divergent plate boundaries. It originated from partial melting of the upper mantle at depths of ~60–80 km. The presence of glass and a chilled margin reflects rapid quenching during submarine eruption, preserving the melt composition with minimal alteration. Geochemically, MORB is typically depleted in incompatible elements and exhibits relatively uniform isotopic ratios (e.g., low ⁸⁷Sr/⁸⁶Sr and high ¹⁴³Nd/¹⁴⁴Nd), indicating a well-mixed, depleted mantle source that has experienced prior melt extraction. Once analyzed for its chemistry and thin sections are made, this sample will serve as a valuable geochemical reference for understanding mantle composition, magma generation processes, and global mantle heterogeneity. Contributor An entity responsible for making contributions to the resource Bereket Haileab, Carleton College Geology Department Adam Soule '97 Relation A related resource <iframe width="100%" height="480" src="https://drive.google.com/file/d/1HfKRYZDJ-neJAuKyLPHDDN0my1OQnPdx/preview" allow="autoplay"></iframe><iframe width="100%" height="480" src="https://drive.google.com/file/d/19f70K0nJ0U2007yA4DfRg2u0qNOaYoXz/preview" allow="autoplay"></iframe><iframe width="100%" height="480" src="https://drive.google.com/file/d/1JqDsPYom35vJgcxBmxyG8vERFSOorom-/preview" allow="autoplay"></iframe><iframe width="100%" height="480" src="https://drive.google.com/file/d/1BfXwdQ7qlhX4-D149unPCLQ6OGps9Lwl/preview" allow="autoplay"></iframe><iframe width="100%" height="480" src="https://drive.google.com/file/d/175deXA_R80TbsZht3wPxO6tZWq19o7xb/preview" allow="autoplay"></iframe> basalt Basalt glass Chilled margin Depleted mantle Divergent plate boundary East Pacific Rise Glass HOV Alvin igneous mafic Mid-Oceanic Ridge Basalt MORB Newest oceanic crust sample Oceanic crust Partial melting quenched glass Submarine basalt Submarine eruption Upper mantle melting volcanic Volcanic glass