dc.contributor.author	Ebel, Denton S.
dc.contributor.author	Gemma, Marina E.
dc.contributor.author	Alpert, Samuel P.
dc.contributor.author	Bayron, Jasmine
dc.contributor.author	Lobo, Ana H.
dc.contributor.author	Weisberg, Michael K.
dc.date.accessioned	2024-04-26T20:40:31Z
dc.date.available	2024-04-26T20:40:31Z
dc.date.issued	2024-04
dc.description.abstract	Abundances, apparent sizes, and individual chemical compositions of chondrules, refractory inclusions, other objects and surrounding matrix have been determined for Semarkona (LL3.00) and Renazzo (CR2) using consistent methods and criteria on x-ray element intensity maps. These represent the non-carbonaceous (NC, Semarkona) and carbonaceous chondrite (CC, Renazzo) superclans of chondrite types. We compare object and matrix abundances with similar data for CM, CO, K, and CV chondrites. We assess, pixel-by-pixel, the major element abundance in each object and in overall matrix. We determine the abundance of “metallic chondrules” in LL chondrites. Chondrules with high Mg/Si and low Fe/Si and matrix carrying opposing ratios complement each other to make whole rocks with near-solar major element ratios in Renazzo. Similar Mg/Si and Fe/Si chondrule-matrix relationships are seen in Semarkona, which is within 11% of solar Mg/Si but significantly Fe-depleted. These results provide a robust constraint in support of single-reservoir models for chondrule formation and accretion, ruling out whole classes of astrophysical models and constraining processes of chondrite component formation and accretion into chondrite parent bodies.
dc.identifier.doi	https://doi.org/10.5531/sd.eps.8
dc.identifier.uri	https://hdl.handle.net/2246/7356
dc.publisher	American Museum of Natural History
dc.title	Abundance, Sizes, and Major Element Compositions of Components in CR and LL Chondrites: Formation from Single Reservoirs

Abundance, Sizes, and Major Element Compositions of Components in CR and LL Chondrites: Formation from Single Reservoirs

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