The goal of this paper is threefold: firstly to provide a detailed description and analysis of tonal spreading rules at the phrasal level in Copperbelt Bemba (CB); secondly to demonstrate a novel rule interaction in phrasal phonology that involves mutually-feeding iterative rules and how this can be formalized within Optimality Theory; and finally to consider the phonology-syntax mapping in CB and evaluate how well current prosodic correspondence theories -here ALIGN/WRAPXP and Match Theory -account for the prosodic constituent structure in CB.Building on earlier work conducted on CB tonology (Bickmore & Kula 2013) two High tone spreading patterns will be central to the discussion of phrasal phonology in CB, namely Bounded Spreading and Unbounded Spreading. The characterisation of phonological phrases is crucial in accounting for these spreading patterns. The paper will examine High tone spreading within a series of single-word phonological phrases occurring in particular syntactic contexts where it is observed that a single High tone in the initial phonological phrase can surface on each lexically toneless syllable of subsequent phonological phrases. We present the basic tone patterns in section 2 and show in section 3 that a rule-based approached is forced to analyse the longdistance spreading patterns as involving mutually-feeding iterative rule interaction. In section 4 we present an alternative OT account of the facts which relies on a CRISP EDGE constraint that makes reference to juncture effects. Section 5 provides a discussion of whether constraints requiring the juncture of two smaller domains to be contained within a larger one are necessary and what the implications of an alternative formulation might be, at least for the present set of data. Finally section 6 provides some concluding remarks.
Unbounded and Bounded High SpreadingFollowing Bickmore and Kula (2013) we can identify two main High tone spreading processes within words in CB, namely, Unbounded and Bounded spreading. Unbounded rightward H spreading targets the rightmost High tone in a phrase-final word (where "phrase" will be made more precise below in section 3) spreading it to the end of the word. We will show that Unbounded Spreading applies only within a word and not across words. Example (1) below illustrates Unbounded Spreading in CB with the source/lexical H tone on the subject marker (1a-b), the pre-prefix (1c), the TAM marker (1d) or on the first syllable of the verb stem (1e). In all cases the H spreads to the word-final TBU. (Underlying forms are shown in the rightmost column).