N-15-Rich Organic Globules in a Cluster IDP and the Bells CM2 Chondrite

Author:: Nakamura-Messenger, K.
Published:: 2008].
Physical Description:: 1 electronic document
Additional Creators:: Messenger, S. and Keller, Lindsay P.

Online Version

hdl.handle.net , Connect to this object online.

Availability

Finding items...

Restrictions on Access:

Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access

Summary:

Organic matter in primitive meteorites and chondritic porous interplanetary dust particles (CP IDPs) is commonly enriched in D/H and 15N/14N relative to terrestrial values [1-3]. These anomalies are ascribed to the partial preservation of presolar cold molecular cloud material [1]. Some meteorites and IDPs contain m-size inclusions with extreme H and N isotopic anomalies [2-4], possibly due to preserved pristine primordial organic grains. We recently showed that the in the Tagish Lake meteorite, the principle carriers of these anomalies are sub- m, hollow organic globules [5]. The globules likely formed by photochemical processing of organic ices in a cold molecular cloud or the outermost regions of the protosolar disk [5]. We proposed that similar materials should be common among primitive meteorites, IDPs, and comets. Similar objects have been observed in organic extracts of carbonaceous chondrites [6-8], however their N and H isotopic compositions are generally unknown. Bulk H and N isotopic compositions may indicate which meteorites best preserve interstellar organic compounds. Thus, we selected the Bells CM2 carbonaceous chondrites for study based on its large bulk 15N (+335 %) and D (+990 %) [9].

Other Subject(s):

Astrophysics

Collection:

NASA Technical Reports Server (NTRS) Collection.

Note:

Document ID: 20080009708.
39th Lunar and Planetary Science Conference; 10-14 Mar. 2008; League City, TX; United States.

Terms of Use and Reproduction:

View MARC record | catkey: 16000563