Paleomagnetism, magnetic anisotropy, and mid-Cretaceous paleolatitude of the Duke Island (Alaska) ultramafic complex

Article Abstract:

A very stable magnetic remanence is found in the mid-Cretaceous ultramafic complex on the Duke Island. Fine magnetite inclusions exsolved in clinopyroxene and probably other ferromagnesian silicate grains carry the remanence. Magnetic anisotropy is a significant feature of the rocks. The anisotropy is strong but nonuniform in direction across the intrusion. The mid-Cretaceous paleolatitude is studied using data from coeval and unlayered plutonic units in the Coast Plutonic Complex.

North America, Anisotropy, Rocks, Igneous, Igneous rocks, Rocks, Ultrabasic, Ultrabasic rocks

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A compaction correction for the paleomagnetism of the cretacious pigeon point formation of California

Article Abstract:

A study of paleomagnetism of the Cretaceous Pigeon Point Formation, California, proves the need for two compaction corrections. Assumptions of prolate and oblate deformations in the magnetic grain orientation direction are used in making the correction curves. Burial compaction and a horizontal lineation from depositional or prelithifications tectonics cause a composite anisotropy of anhysteretic remanence structure in Pigeon Point Formation.

California, Compacting, Batholiths

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Paleomagnetism of the Upper Devonian reef complexes, Canning Basin, Western Australia

Article Abstract:

A sample-based study of paleomagnetism of the Upper Devonian reef complexes in the Canning Basin, Western Australia, provided factual details on the magnetization age of the reef. Samples from back reef and reefal limestones, basinal red beds, syndepositional cracks and voids were studied through an allochthonous block test and a syndepositional breccia test.

Natural history, Canning Basin

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