Long neglected as a primary impetus of study, textual silences abound in such field disciplines as geology, where most field results seem to 'disappear' from the published research article. This paper first discusses the nature of textual silence and then proposes a typology of textual silences associated with written scientific discourse. Next, by examining the different disciplinary genres involved in the "recontextualizations" of a fieldwork study in geology, this study seeks to (1) identify textual silence in the various recontextualizations and (2) offer explanations for it.
The 'said' and the 'unsaid' in scientific discourseThe fundamental role played by "silences" in communication has been strongly underscored by a number of authors over the years. Hall (1985), for example, has observed that positively marked terms have meaning because of their relation to what is absent and unmarked. Ducrot (1973) argues that the relational link between the explicit and the implicit is made visible by the presuppositions underlying communicative acts. These implicit presuppositions allow for a set of conventions and laws to be seen within a language, and regulate individuals' interactions.Becker (1995) also emphasizes the essential role played by silence, by noting that "speech consists above all in silences. A being who could not renounce saying many things would be incapable of speaking . . . Each people leaves some things unsaid in order to be able to say others" (Becker 1995, p. 6
82cess of selection, of setting aside certain items which are "unsayable" in particular situations, either for structural reasons ("interlingual system constraints", Swales 1999), or because of the communally-constructed and culturally-determined context of silence (Swales' "intralingual ritual constraints"). Therefore, the process of selection is also highly dependent on the situated context of the communicative event.Thus we see that within every communicative structure there exists a necessary complementarity between what is explicit and what is not. Silence is not a simple pause or absence of communication, but rather it has, like overt discourse, a functional role with its own meaning and interpretive value (see also Tannen & Saville-Troike 1985, Jaworski 1993. This interpretive value is not immediately apparent, for it appears only after the hearer has "reconstructed" the speaker's intent on the basis of shared knowledge and assumptions. Over time, silences become a 'normalized' and 'anticipatable' part of the institutional framework that regulates communicative interactions. And finally, our capacity to use silences at appropriate moments and interpret the silences of others depends on our acculturation into a particular community. Indeed, "It only takes one person to produce speech, but it requires the cooperation of all to produce silence" (Pittenger et al. 1960) And yet, despite the manifestation of such culturally-embedded, highlyconventionalized and community-generated instances of implicit communication, the discours...