Shallow seismic reflection surveys in the Takaka valley, northwest Nelson

Publisher Website
Google Scholar
Abstract
Results are presented from two seismic reflection profiles in the Takaka valley, northwest Nelson. Apreviously unknown complex structure is revealed in Tertiary sediments, indicative of a local compressional regime. Shallow, low-angle thrust faults are interpreted as deforming the Oligocene Motupipi Coal Measures and Takaka Limestone in the central part of the valley, and the overlying Miocene Tarakohe Mudstone also appears to be disrupted by the faulting. Further to the north, a reverse fault is seen in the Motupipi Coal Measures. The regional compressional event resulting in these faults is probably of Miocene age. On the seismic sections the thickness of Motupipi Coal Measures varies between 240 and 350m; conformably lying above this unit is theTakaka Limestone, and upto 130m of Tarakohe Mudstone appears to onlap the limestone.

This publication has 1 reference indexed in Scilit: