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Mishra, Ritesh Kumar
- Petrography and Mineralogy of Calcium-, Aluminum-Rich Inclusions in an Unequilibrated Carbonaceous Chondrite Y 81020 (CO3.05)
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Authors
Affiliations
1 Center for Isotope Cosmochemistry and Geochronology, Astromaterials Research and Exploration Science Division, EISD-XI, NASA-Johnson Space Center, 2101, NASA Parkway, Houston, TX 77058, US
1 Center for Isotope Cosmochemistry and Geochronology, Astromaterials Research and Exploration Science Division, EISD-XI, NASA-Johnson Space Center, 2101, NASA Parkway, Houston, TX 77058, US
Source
Current Science, Vol 114, No 07 (2018), Pagination: 1510-1519Abstract
Petrographic and quantitative analyses of more than 70 refractory inclusions found in the studied thin section of Yamato 81020 (CO3.05) showed diverse objects that can be grouped into five distinct types based on morphology and mineralogy. Mineralogical, textural similarities to the pristine carbonaceous vigarano (3.1–3.4) types of Efremovka, Vigarano were observed despite their smaller size (~100 micron diameter). Wark-Lovering rims were found predominantly in melilite-rich calcium, aluminum-rich inclusions. Comparison of mineralogy, morphology at macro and micro scale of Y 81020 with ALH A77307 and other carbonaceous chondrites is suggestive of the unaltered characteristics of the refractory inclusions in agreement with previous studies.Keywords
Antarctic Meteorites, Calcium, Aluminumrich Inclusions, Petrography, Quantitative Analyses, Unequilibrated Carbonaceous Chondrites.Full Text
References
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- 26Al–26Mg Isotopic Studies in Some Calcium–Aluminium-Rich Inclusions and Chondrules from Unequilibrated Chondrites
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Authors
Affiliations
1 Independent Researcher, Dhawalpur Village, PO Kaitha, Bhagalpur 813 211, IN
2 Planetary Sciences Division, Physical Research Laboratory, Navrangpura, Ahmedabad 360 009, IN
3 Klaus-Tschira-Labor für Kosmochemie, Institut für Geowissenschaften, Im Neuenheimer Feld 234-236 Ruprecht-Karls-Universität, Heidelberg, D-69210, DE
1 Independent Researcher, Dhawalpur Village, PO Kaitha, Bhagalpur 813 211, IN
2 Planetary Sciences Division, Physical Research Laboratory, Navrangpura, Ahmedabad 360 009, IN
3 Klaus-Tschira-Labor für Kosmochemie, Institut für Geowissenschaften, Im Neuenheimer Feld 234-236 Ruprecht-Karls-Universität, Heidelberg, D-69210, DE
Source
Current Science, Vol 125, No 2 (2023), Pagination: 191-203Abstract
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. 26Al–26Mg 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 26Al/27Al = 5.25 ´ 10–5, from a partial melt heated to a maximum temperature of ~1420°C and cooled slowly at £0.5°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 26Mg excess due to their small Al/Mg ratio or resetting by secondary processesKeywords
Calcium–Aluminium-Rich Inclusions, ChondRules, Early Solar System Relative Chronology, Short-Lived Now-Extinct Radionuclide, Solar System.Full Text
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