26Al-26Mg isotopic studies in some calcium-aluminium-rich inclusions and chondrules from unequilibrated chondrites

• Verfasst von: Mishra, Ritesh Kumar [VerfasserIn]
• Verfasst von: Marhas, Kuljeet Kaur [VerfasserIn]
• Verfasst von: Trieloff, Mario [VerfasserIn]
• Titel: 26Al-26Mg isotopic studies in some calcium-aluminium-rich inclusions and chondrules from unequilibrated chondrites
• Verf.angabe: Ritesh Kumar Mishra, Kuljeet Kaur Marhas and Mario Trieloff
• E-Jahr: 2023
• Jahr: 25 Jul, 2023
• Umfang: 13 S.
• Illustrationen: Illustrationen
• Fussnoten: Gesehen am 28.11.2023 ; DOI funktioniert nicht ; Im Titel ist die Zahl "26" jeweils hochgestellt
• Titel Quelle: Enthalten in: Current science
• Ort Quelle: Bangalore : Current Science Association ; Indian Academy of Science, 1932
• Jahr Quelle: 2023
• Band/Heft Quelle: 125(2023), 2 vom: Juli, Seite 191-203
• ISSN Quelle: 0011-3891
• DOI: doi:10.18520/cs/v125/i2/191-203
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: AL-26
• Sach-SW: Calcium-aluminium-rich inclusions
• Sach-SW: chondrules
• Sach-SW: CONSTRAINTS
• Sach-SW: CRYSTALLIZATION
• Sach-SW: DURATION
• Sach-SW: early solar system relative chronology
• Sach-SW: EARLY SOLAR-SYSTEM
• Sach-SW: FE-60
• Sach-SW: MAGNESIUM
• Sach-SW: MG
• Sach-SW: NEBULA
• Sach-SW: OXYGEN
• Sach-SW: short-lived now-extinct radionuclide
• Sach-SW: solar system
• K10plus-PPN: 1871468116

Abstract

Calcium-aluminium-rich inclusions (CAIs) and chondrules are the oldest dated components of chondrites. They record the events and processes during the formation and early evolution of the solar system in their morphology, mineral phases and isotopic compositions. Al-26-Mg-26 isotopic systematics of two CAIs from Leoville (CV3.1-3.4), two chondrules from Queen Alexandra range 99177 (CR3.00), one mega chondrule from Semarkona (LL3.00), and a plagioclase rich chondrule from Chainpur (LL3.4) were carried out to understand the formation processes of these rare kinds of objects and to obtain constraints on early solar system events and processes. Petrographic and isotopic properties of Leoville CAI 1 (Type B2) suggest its formation c. 0.1 Ma after typical non-igneous CAIs characterized by the canonical ratio of Al-26/Al-27 = 5.25 x 10(- 5), from a partial melt heated to a maximum temperature of similar to 1420 degrees C and cooled slowly at <= 0.5 degrees C/h. Leoville CAI 3 (Type A) plausibly formed early within 1 Ma of the canonical CAI value and subsequently experienced parent body aqueous alteration. The analysed chondrules did not yield significant Mg-26 excess due to their small Al/Mg ratio or resetting by secondary processes.