1976 Volume 26 Issue 137 Pages 207-220
The geologic history of the Proterozoic Erathem in the Hamersley area is successively interpreted in terms of the uplift of a large scale dome of the Archaean basement with the approximate centre between. Wittenoom and Marble Bar (Figure 5).
This concept well define geology in this area, especially in the southern half of it; migration of the Proterozoic sedimentary basin from north to south with age, distribution pattern of folds and faults, and the Proterozoic tectonical history.
There is no available Proterozoic outcrop to indicate detailed geology in the northern part of the dome. However, if the concept of a large scale dome-up is acceptable, the northern part is not probably expected to have a thick accumulation of sediments and then to have structural features due to the tectonical stress occurred in the hinge area between the sinking basin and uplifting dome in the southern part.
The favorable sedimentary environment for banded iron formation has been considered to be appeared by establishment of a closed basin to the ocean. In the case of the Hamersley area, the appearence of the imperfectly closed basin was probably caused by uplifting of the Archaean basement.
