This paper presents the description of patterns of textual and lexicogrammatical organization of the genre of academic writing "thesis abstract". For describing patterns of textual organization, a model proposed by Bhatia (1993) was used. The lexicogrammatical analysis was based on field domain, a register variable developed by Halliday (1978, 1994). The main results show that: 1) Linguistics researchers seem to attribute more importance to the goals and the theoretical-methodological approach of the thesis, while Chemistry researchers seem to give greater emphasis to procedures and results adopted in the research, which was shown more clearly and directly, compared to Linguistics; 2) with respect to the lexicogrammatical analysis, was verified the predominance of relational processes and various circumstantial elements in the Linguistics abstracts, while in the Chemistry abstracts prevail the material processes and the omission of the agency.
academic genre; thesis abstract; pattern of textual organization
