--> ABSTRACT: Strike-Slip Tectonics of the Mesozoic Sutures of the Soviet Far East, by B. A. Natal'in, C. B. Borukayev; #90097 (1990).

Datapages, Inc.Print this page

ABSTRACT: Strike-Slip Tectonics of the Mesozoic Sutures of the Soviet Far East

B. A. Natal'in, C. B. Borukayev

The Early-Middle Jurassic Mongol-Okhotsk suture separates the Mesozoic Siberian active margin from the Bureya massif. The Late Cretaceous Amur suture is located between the Khingan-Okhotsk active margin of Asia and the Sikhote-Alin terrane. In both sutures the collision produced multistage deformations, magmatism, metamorphism, and foredeep formation. The structural style of sutures is determined by wide-scale sinistral strike-slip motions. In the latitudinal Mongol-Okhotsk suture they are imprinted in the pronounced stretching lineation, and in the NE-trending Amur suture, in the boudinage, steeply plunging asymmetric folds, and ductile faults.

The subduction stages of both active continental margins' development and the collisional strike-slip tectonics of the Amur suture were determined by the northward plate motions in the Mesozoic Pacific Ocean oriented at an acute angle to the Asia margin. The collision, which formed the Mongol-Okhotsk fold system, was going on according to another scenario. The Bureya massif blocks were in the early, middle, and late Paleozoic accretionary fold systems located between the Siberian and Sino-Korean platforms. The Triassic-Middle Jurassic convergence of these platforms, assumed on the paleomagnetic data, led to the expulsion of blocks to the east, their oblique motion along the southern margin of the Siberian Platform, and the appearance of the collisional strike-slip structures of the Mo gol-Okhotsk suture.

AAPG Search and Discovery Article #90097©1990 Fifth Circum-Pacific Energy and Mineral Resources Conference, Honolulu, Hawaii, July 29-August 3, 1990