Sequence Stratigraphic Context of Syndepositional Diagenesis in Cool-Water Shelf Carbonates: Pliocene Limestones, New Zealand

摘要

Pliocene limestones in eastern North Island, New Zealand, are cool-water deposits composed of barnacle–epifaunal bivalve–bryozoan dominated calcitic biota formed in shoal areas about the margins of a tectonically active forearc basin seaway. Vertical changes in the thickness and depositional facies of the limestones, and fundamentally the position and nature of internal bounding discontinuities within them, have enabled identification of high-order (likely 41 ka) transgressive (deepening-upwards) and transgressive–regressive (deepening-then shallowing-upwards) sequences within the formations.