3D MODEL OF REVERSED S-SHAPED OROGENIC BELTS ON THE CONTINENTAL MARGIN : WITH A DISCUSSION OF THE INTERNAL STRUCTURE AND UPLIFT OF THE QINGHAI-TIBET PLATEAU

LI Dong-xu

Volume 13 Issue 1

Mar. 2007

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LI Dong-xu, 2007. 3D MODEL OF REVERSED S-SHAPED OROGENIC BELTS ON THE CONTINENTAL MARGIN : WITH A DISCUSSION OF THE INTERNAL STRUCTURE AND UPLIFT OF THE QINGHAI-TIBET PLATEAU. Journal of Geomechanics, 13 (1): 31-41.

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3D MODEL OF REVERSED S-SHAPED OROGENIC BELTS ON THE CONTINENTAL MARGIN : WITH A DISCUSSION OF THE INTERNAL STRUCTURE AND UPLIFT OF THE QINGHAI-TIBET PLATEAU

LI Dong-xu

China University of Geosciences, Beijing 100083, China

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Received: 2007-01-08
Published: 2007-03-01

Abstract

Abstract

According to the tectono-geomorphological features and characteristics of neotectonic movement on the southwestern margin of the North American continent, the author has established a 3D tectonomechanic model of the reversed S-shaped continental-margin orogenic belt of the northern hemisphere. This zigzag orogenic belt extends from Alaska through the Cordillera to the Caribbean and may be divided into three sections :(1)the Alaska region, which, as a head arc, is an arcuate dextral shear uplifted orogenic belt; (2)the Cordillera orogenic belt, which as a middle section, is a straight dextral strike-slip orogenic belt; and(3)the region from south of the Madre Mountains to the Caribbean Sea, which, as a tail arc, is a sinistral transrotational " trench-arc-basin system". The author used this model to check the orogenic belts on the southern margin of the Eurasian continent and ascertained that the zigzag mountain chain from the Alps through Zagros and Himalaya to Indonesia is composed of four connected reversed S-shaped orogenic belts. The cause for their decomposition into four separate tectonic systems is related to the breakup of the supercontinent Gondwana in the southern hemisphere. According to the above-mentioned regional tectonic characteristics, the author thinks that the original internal structure of the Qinghai-Tibet Plateau was a transrotational trench-arc-basin system, belonging to the tail arc of the Pamir-Karakorum-Himalaya reversed S-shaped orogenic belt.Later it underwent the superimposition of two dynamic systems, the subduction of the Indian plate and the dextral shear and uplift of the head arc of the Qinghai-Tibet-Sanjiang-Indonesia reversed S-shaped orogenic belt.

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