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Evolution of the Mesozoic Yuljeon Basin in South Korea and its tectonic implication
Lithos ( IF 3.5 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.lithos.2020.105560
Younggi Choi , In Chang Ryu , Jieun Seo , Chang Whan Oh

Abstract The Mesozoic Yuljeon Basin (YB) is a small scale non–marine sedimentary basin in the northeastern part of the Gyeonggi Massif in the Korean Peninsula. The YB consists of two lithostratigraphic units, the Munamdong and Yuljeon formations. Based on an integrated study of stratigraphy, structural geology, geochronology, and geochemistry, major episodes of the YB have been investigated. In the late Triassic (after 227 Ma), the YB was formed in a tectonic setting, wherein crust was extended and uplifted, which resulted in deposition of the Munamdong Formation. In the latest early Jurassic (circa 180 Ma), the Yuljeon Formation was deposited in association with volcanic activity in a continental magmatic arc setting. On entering the middle Jurassic (circa 174 Ma), extension in the YB stopped and then basin inversion occurred due to contractional deformation. The middle Jurassic thermal pulse in the area generated various scale igneous rocks and induced hydrothermal circulations, which created suitable conditions for fault activity with help of fluid pressure. This study demonstrates that the YB formed with sedimentation in a post–collisional extensional setting related to the Songrim Orogeny, and then it was enlarged with volcanic–related sedimentation in a continental arc setting related to the Daebo Orogeny, and lastly it was followed by basin inversion with arc magmatism in the same continental arc setting, reflecting the temporal and spatial changes in regional tectonics. Moreover, the general provenance characteristics for the early Mesozoic strata in the eastern North China Block, Gyeonggi Massif of South Korea, and southwest Japan, can be geochronologically correlated. The sedimentary rocks record the distinctive tectonothermal histories of East Asia such as the middle Paleoproterozoic orogens in the eastern North China Block, the Permo–Triassic continental collision between North and South China Blocks, and the subduction of Paleo–Pacific plate during the Mesozoic.

中文翻译:

韩国中生代玉田盆地演化及其构造意义

摘要 中生代玉田盆地(YB)是朝鲜半岛京畿地块东北部的一个小型非海相沉积盆地。YB 由两个岩石地层单元组成,即 Munamdong 和 Yuljeon 地层。基于地层学、构造地质学、地质年代学和地球化学的综合研究,已经调查了YB的主要事件。晚三叠世(227 Ma以后),YB形成于构造环境,地壳伸展隆升,导致Munamdong组沉积。在最近的早侏罗世(约 180 Ma),玉田组沉积与大陆岩浆弧环境中的火山活动有关。进入侏罗纪中期(约 174 Ma),YB 的伸展停止,然后由于收缩变形发生盆地反转。该地区中侏罗世热脉冲产生了各种规模的火成岩并诱发了热液循环,在流体压力的帮助下为断层活动创造了合适的条件。本研究表明,YB在与松林造山运动相关的碰撞后伸展环境中形成沉积,然后在与大博造山运动相关的大陆弧环境中与火山相关的沉积作用扩大,最后是盆地同一大陆弧背景下弧岩浆反演,反映了区域构造的时空变化。此外,华北地块东部早中生代地层的一般物源特征,韩国的京畿地块和日本西南部,可以进行年代学相关。沉积岩记录了华北地块东部中古元古代造山带、华北地块和华南地块二叠纪-三叠纪大陆碰撞、中生代古太平洋板块俯冲等东亚独特的构造热历史。
更新日期:2020-08-01
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