NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Contemporaneous Formation of Chondrules in the Al-26-MG-26 System for Ordinary and CO ChondritesChronometer using the short-lived extinct-nuclide (26)Al has been applied to chondrules in order to obtain of their formation ages. Previous studies were mostly performed on Al-rich chondrules, which constitute only 1% of all chondrules, because of their high Al/Mg ratios. Recently, (26)Al ages of major ferromagnesian chondrules in least equilibrated ordinary chondrites (OC) have been obtained. However, (26)Al ages of ferromagnesian chondrules in least equilibrated carbonaceous chondrites (CC) are very limited. Particularly, age data of FeO-poor (Type I) chondrules in CC have been scarcely obtained, because of their fine textures and lack of phases with high Al/Mg (>100) ratios. In order to clarify the origin and formation processes of chondrules, we started systematic investigations on Type I chondrules in the most pristine CC (CO3.0 Yamato-81020), by examining textures, bulk chemical compositions, (26)Al ages and oxygen isotopic compositions. We find Type I chondrules in CC formed contemporaneously with ferromagnesian chondrules in OC.
Document ID
20040068145
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Kurahashi, E.
(Tokyo Univ. Japan)
Kita, N. T.
(Geological Survey of Japan Tsukuba, Japan)
Nagahara, H.
(Tokyo Univ. Japan)
Morishita, Y.
(Geological Survey of Japan Tsukuba, Japan)
Date Acquired
August 21, 2013
Publication Date
January 1, 2004
Publication Information
Publication: Lunar and Planetary Science XXXV: Chondrules: The Never-Ending Story
Subject Category
Lunar And Planetary Science And Exploration
Meeting Information
Meeting: Lunar and Planetary Science XXXV: Chondrules: The Never-Ending Story
Location: Houston, TX
Country: United States
Start Date: March 15, 2004
End Date: March 19, 2004
Sponsors: Lunar and Planetary Inst.
Distribution Limits
Public
Copyright
Public Use Permitted.
Document Inquiry

Available Downloads

There are no available downloads for this record.
No Preview Available