FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W795677125> ?p ?o ?g. }

• W795677125 abstract "Deformed chondrules in CM2 Murchison have been found to define a prominent foliation [1,2] and lineation [3] in 3D using X-ray computed tomography (XCT). It has been hypothesized that chondrules in foliated chondrites deform by squeezing into surrounding pore space [4,5], a process that also likely removes primary porosity [6]. However, shock stage classification based on olivine extinction in Murchison is consistently low (S1-S2) [4-5,7] implying that significant intracrystalline plastic deformation of olivine has not occurred. One objective of our study is therefore to determine the microstructural mechanisms and phases that are accommodating the impact stress and resulting in relative displacements within the chondrules. Another question regarding impact deformation in Murchison is whether it facilitated aqueous alteration as has been proposed for the CMs which generally show a positive correlation between degree of alteration and petrofabric strength [7,2]. As pointed out by [2], CM Murchison represents a unique counterpoint to this correlation: it has a strong petrofabric but a relatively low degree of aqueous alteration. However, Murchison may not represent an inconsistency to the proposed causal relationship between impact and alteration, if it can be established that the incipient aqueous alteration post-dated chondrule deformation. Methods: Two thin sections from Murchison sample USNM 5487 were cut approximately perpendicular to the foliation and parallel to lineation determined by XCT [1,3] and one section was additionally polished for EBSD. Using a combination of optical petrography, SEM, EDS, and EBSD several chondrules were characterized in detail to: determine phases, find microstructures indicative of strain, document the geometric relationships between grain-scale microstructures and the foliation and lineation direction, and look for textural relationships of alteration minerals (tochilinite and Mg-Fe serpentine) that indicate timing of their formation relative to deformation event(s). Preliminary Results: Deformed chondrules are dominated by forsterite and clinoenstatite with lesser amounts of Fe-Mg serpentine, sulfides, and low calcium pyroxene. Olivine grains are commonly fractured but generally show sharp optical extinction. The pyroxene, in contrast, is not only fractured but also often displays undulose extinction. In addition, the clinoenstatite is frequently twinned but it is unclear whether the twins are the result of mechanical deformation or inversion from protoenstatite [8]. EBSD work is currently ongoing to determine if areas of higher crystallographic strain can be imaged and mapped, and to determine the pyroxene twin orientations. In regards to alteration, we have found evidence for post-deformation formation of tochilinite and Mg-Fe serpentine indicating that aqueous alteration has indeed post-dated the deformation of the chondrules." @default.
• W795677125 created "2016-06-24" @default.
• W795677125 creator A5022652386 @default.
• W795677125 creator A5033176490 @default.
• W795677125 creator A5051985180 @default.
• W795677125 creator A5062236930 @default.
• W795677125 creator A5073652461 @default.
• W795677125 date "2014-09-07" @default.
• W795677125 modified "2023-09-27" @default.
• W795677125 title "Impact-Induced Chondrule Deformation and Aqueous Alteration of CM2 Murchison" @default.
• W795677125 hasPublicationYear "2014" @default.
• W795677125 type Work @default.
• W795677125 sameAs 795677125 @default.
• W795677125 citedByCount "0" @default.
• W795677125 crossrefType "journal-article" @default.
• W795677125 hasAuthorship W795677125A5022652386 @default.
• W795677125 hasAuthorship W795677125A5033176490 @default.
• W795677125 hasAuthorship W795677125A5051985180 @default.
• W795677125 hasAuthorship W795677125A5062236930 @default.
• W795677125 hasAuthorship W795677125A5073652461 @default.
• W795677125 hasConcept C116862484 @default.
• W795677125 hasConcept C121332964 @default.
• W795677125 hasConcept C127313418 @default.
• W795677125 hasConcept C130635790 @default.
• W795677125 hasConcept C159985019 @default.
• W795677125 hasConcept C161067153 @default.
• W795677125 hasConcept C165783156 @default.
• W795677125 hasConcept C192562407 @default.
• W795677125 hasConcept C199289684 @default.
• W795677125 hasConcept C2778998827 @default.
• W795677125 hasConcept C2779517257 @default.
• W795677125 hasConcept C2780364934 @default.
• W795677125 hasConcept C27805521 @default.
• W795677125 hasConcept C87355193 @default.
• W795677125 hasConcept C87976508 @default.
• W795677125 hasConceptScore W795677125C116862484 @default.
• W795677125 hasConceptScore W795677125C121332964 @default.
• W795677125 hasConceptScore W795677125C127313418 @default.
• W795677125 hasConceptScore W795677125C130635790 @default.
• W795677125 hasConceptScore W795677125C159985019 @default.
• W795677125 hasConceptScore W795677125C161067153 @default.
• W795677125 hasConceptScore W795677125C165783156 @default.
• W795677125 hasConceptScore W795677125C192562407 @default.
• W795677125 hasConceptScore W795677125C199289684 @default.
• W795677125 hasConceptScore W795677125C2778998827 @default.
• W795677125 hasConceptScore W795677125C2779517257 @default.
• W795677125 hasConceptScore W795677125C2780364934 @default.
• W795677125 hasConceptScore W795677125C27805521 @default.
• W795677125 hasConceptScore W795677125C87355193 @default.
• W795677125 hasConceptScore W795677125C87976508 @default.
• W795677125 hasOpenAccess W795677125 @default.
• W795677125 hasRelatedWork W13146910 @default.
• W795677125 hasRelatedWork W1585199521 @default.
• W795677125 hasRelatedWork W1990182697 @default.
• W795677125 hasRelatedWork W2002723593 @default.
• W795677125 hasRelatedWork W2022594027 @default.
• W795677125 hasRelatedWork W2035159064 @default.
• W795677125 hasRelatedWork W2055757159 @default.
• W795677125 hasRelatedWork W2058900816 @default.
• W795677125 hasRelatedWork W2060961440 @default.
• W795677125 hasRelatedWork W2064840320 @default.
• W795677125 hasRelatedWork W2068298683 @default.
• W795677125 hasRelatedWork W2122391236 @default.
• W795677125 hasRelatedWork W2161644330 @default.
• W795677125 hasRelatedWork W2527236927 @default.
• W795677125 hasRelatedWork W2607492974 @default.
• W795677125 hasRelatedWork W2770496139 @default.
• W795677125 hasRelatedWork W3009832751 @default.
• W795677125 hasRelatedWork W3115243498 @default.
• W795677125 hasRelatedWork W3182379868 @default.
• W795677125 hasRelatedWork W3185947796 @default.
• W795677125 isParatext "false" @default.
• W795677125 isRetracted "false" @default.
• W795677125 magId "795677125" @default.
• W795677125 workType "article" @default.