Paleomagnetism of the Middle Jurassic Sedimentary Rocks of the Elgon Formation of the Ulban Terrane

The paper presents the first findings of paleomagnetic studies on Middle Jurassic sedimentary rocks of the Elgon Formation of the Ulban Terrane from the coastal outcrops along the Ulban Bay (53.5 degrees N, 137.7 degrees E). Demagnetization yielded a ChRM component of the pre-folding age. No inclination shallowing effect for the ChRM vector was revealed in sandstone specimens of the Elgon Formation. The paleomagnetic pole coordinates and the paleolatitude at which the studied rocks deposited were calculated: Plat = -34.3 (34.3)degrees; Plong = 161.2 (341.2)degrees; dm = 2.7, dp = 5.3, paleolatitude = 0.1 degrees (+2.7 degrees/-2.6 degrees) S. The acquired paleomagnetic data are evidence of the deposition of the rocks of the Ulban Terrane in the Middle Jurassic at the boundary between the Asian paleocontinent and the Paleo-Pacific, which later formed part of the Sikhote Alin Orogenic Belt.

Automated summary

This study presents the initial findings of paleomagnetic research on Middle Jurassic sedimentary rocks from the Ulban Terrane at coastal outcrops along Ulban Bay. The acquired paleomagnetic data confirm the deposition age and geological significance of the Ulban Terrane rocks.