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Rifts northern gun one pdf

The Ulleung Basin experienced simple-shear style asymmetric back-arc extension. The asymmetric extension of fossil back-arc basins can be studied based on stratigraphy, volcanic activity, fault pattern and deep crustal structure. By the simple-shear-style crustal extension, rifts northern gun one pdf, fault pattern and crustal structure become increasingly asymmetric.

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The paper focuses on the formative processes of variable asymmetric features of the basin and on their relationship to the style of lithospheric stretching. Moho discontinuity that together decrease toward north. We argue that the fundamental control of such asymmetric features was the simple-shear-style lithospheric extension, which presumably involved a crustal detachment, the mid-crustal extension of north-dipping syn-extensional listric normal faults. By the simple-shear-style extension, syn-extensional faults evolved to dip toward north, and at the same time volcanic activities that had been initially widespread throughout the basin became to concentrate to the north of the basin. Check if you have access through your login credentials or your institution. 2017 Published by Elsevier B. In order to understand the volcano-tectonic evolution history of the East Sea back-arc basin, this study focuses on the seismic characteristics of acoustic basement, based on the multi-channel seismic reflection data acquired from the South Korea Plateau, the northern Ulleung Basin, and the Ulleung Interplain Gap.

Type-A acoustic basement is a remnant of rifted continental crust comprising relatively shallow-seated continental margin platforms, elongated ridges, and equidimensional blocks in the South Korea Plateau and its vicinities. South Korea Plateau, the Ulleung Interplain Gap, and the northern Ulleung Basin. Type-C acoustic basement is a cluster or chain of volcanic edifices which shows internal facies variation from main body to apron slope facies. Volcanic activities identified in the types-B and -C acoustic basements can be classified into three stages based on the volcano-stratigraphic correlation with the existing stratigraphic framework. Early-stage continental rifting prior to the Middle Miocene most likely controlled this volcanism. Ulleung Basin and Ulleung Interplain Gap. During the Middle Miocene, the weakening of back-arc extension might have resulted in limited volcanic eruption, which formed elongate volcanic fields across the Ulleung and Yamato basins.

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This vertical stacking pattern is indicative of multiple eruption events from a single eruption center at least from the Late Miocene to the Quaternary. Expanded volcanic age-control, based on volcano-stratigraphic and isotopic age dating, reveals that the volcanic activities in the southwestern and southeastern East Sea show similar spatio-temporal variations. This implies that the entire southern East Sea has experienced almost same volcano-tectonic evolution during the Cenozoic back-arc evolution. Considering the chemical properties of volcanic rock samples from the volcanic chain in association with the suggested tectonic frameworks during the Tertiary, the remnant magma source derived from the waning mantle convection most likely fed the volcanic chain in the terminal stage of back-arc opening. Three types of acoustic basements are newly defined in the mid-western East Sea. Three stages of volcanic events are newly defined in the mid-western East Sea.