Diagenetic development of unstable and stable magnetization in the St. Bees Sandstone (Triassic) of northern England

Details Diagenetic development of unstable and stable magnetization in the St. Bees Sandstone (Triassic) of northern England Diagenetic development of unstable and stable magnetization in the St. Bees Sandstone (Triassic) of northern England

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..34..113t&link_type=abstract

Earth and Planetary Science Letters, Volume 34, Issue 1, p. 113-124.

Computer Science

4

Scientific paper

Thermal demagnetization of red and drab sandstones from the St. Bees Sandstone shows a wide range of directional stability. After the removal of a metastable secondary magnetization at temperatures up to 300°C red sandstones may show stable or unstable magnetization. Experiments indicate that both the stable and unstable magnetization is carried by coarse haematite particles (specularite). Drab sandstones, which have been subject to reduction and dissolution of shaematite are generally unstable but specimens with a stable NRM occur and this must be carried by specularite because the pigment has been removed from these specimens. The stable magnetization is believed to have developed during deposition and early diagenesis by the oxidation of detrital iron oxides. Pole positions correspond to known Triassic poles and there are abundant normal and reversed zones typical of the Lower Triassic. The unstable magnetization of the red sandstones is apparently due to the development of authigenic overgrowths of haematite on the detrital specularites. This phase of authigenesis may have taken place over a long time, and after significant changes in the ambient geomagnetic field resulting in complex magnetizations in individual grains and hence whole rocks.

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