The Newporte impact structure, North Dakota, USA

Details The Newporte impact structure, North Dakota, USA The Newporte impact structure, North Dakota, USA

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.4747k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 59, Issue 22, pp.4747-4767

Computer Science

5

Scientific paper

The 3-km-diameter Newporte structure is located close to the USA-Canada border in North Dakota, in the Williston Basin. The structure is currently covered by about 3 km of various supracrustal rock formations and was first studied in the course of hydrocarbon exploration in the late 1970s. The structure is situated in Precambrian crystalline basement, which is highly fractured and brecciated. Detailed petrographic and geochemical studies of rock samples from the Duerre 43-5, the Mott 14-34, and the Wisdahl 23-10 drill cores show the presence of three types of breccias: a mainly granite-derived breccia, a predominantly (meta)sediment-derived breccia, and a mixed breccia type. Quartz grains (as well as a few rare feldspar grains) from all three breccia types show planar deformation features (PDFs) with up to five sets per grain. Measurements of the crystallographic orientations of the PDFs show predominantly {10 3} ( ) and {10 2} ( ) orientations, which are characteristic of shock metamorphism and indicate peak shock pressures in excess of 12 GPa. The major and trace element composition of the target rocks (granitoid and sedimentary rocks) and the fragmental impact breccias was measured. All three rock types (sediments, granitoids, and breccias) show a wide compositional range. Mixing calculations were performed and yield results that are in general agreement with the petrographic observations, but the compositional similarity of the target rock components and their wide range in chemical composition make unambiguous mixing calculations difficult. The results of our study confirm the impact origin of the Newporte structure.

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