GLASSES IN CHONDRULES: UNDERSTANDING THE ROLE OF LIQUIDS DURING CHONDRULE FORMATION PROCESSES.

VARELA M.E.

Houston

Conferencia; 47 Lunar and Planetary Science Conference; 2016

Since the first summaries, in which the theories of chondrule origin were exposed [1-2], chon-drules and chondrule formation have been studied in-tensively. However, there is no real consensus regard-ing the nature of the liquid droplet from which chon-drules are suppose to be formed and other issues con-cerning their formation still remain unresolved [e.g., 3]. Two principal models can be outlined concerning the origin of chondrules in the solar nebula (e.g., 4 and references therein): a) Chondrules are formed by melt-ing of pre-existing solids (e.g., MSP: Melting of Solid Precursors) during transient and locale heating. As a result, their properties can be established by their pre-cursors if these systems remained as close-system [e.g., 5-6], due to evaporation and recondensation processes, if they went through open-system melting [e.g., 7]. b) Chondrules are formed through direct con-densation of solar nebula gas into liquids and crystals [e.g., 8]. As chondrules are individuals and have ex-treme compositional diversity, the question that arises is whether objects that are characterized by having different textures (e.g., PO, POP, glass-rich), could have been formed through a single process.Here I compare the chemical composition (major and trace elements) of porphyritic chondrules with the glass-rich chondrules [9-10] from the UOC Tieschitz L/H3.6 (PTS, Tieschitz L 3441-3443, NHMV), to un-derstand further the role of liquids (the glass precur-sor) during crystal growth.