Neoproterozoic Bimodal Volcanism in the Okcheon Belt, South Korea, and Its Comparison with the Nanhua Rift, South China: Implications for Rifting in Rodinia

2006 ◽  
Vol 114 (6) ◽  
pp. 717-733 ◽  
Author(s):  
Sung Won Kim ◽  
Chang Whan Oh ◽  
In‐Chang Ryu ◽  
I. S. Williams ◽  
K. Sajeev ◽  
...  
Keyword(s):  
South Korea ◽  
South China ◽  
Bimodal Volcanism ◽  
Okcheon Belt ◽  
Nanhua Rift

Sedimentary successions and the onset of the Neoproterozoic Jiangnan sub-basin in the Nanhua rift, South China

2014 ◽  
Vol 104 (3) ◽  
pp. 521-539 ◽  
Author(s):  
Jian Wang ◽  
Xiaolin Zhou ◽  
Qi Deng ◽  
Xiugen Fu ◽  
Taizhong Duan ◽  
...  
Keyword(s):  
South China ◽  
Nanhua Rift

Geochronology and paleoenvironment of the pre-Sturtian glacial strata: Evidence from the Liantuo Formation in the Nanhua rift basin of the Yangtze Block, South China

2013 ◽  
Vol 233 ◽  
pp. 118-131 ◽  
Author(s):  
Qiuding Du ◽  
Zhengjiang Wang ◽  
Jian Wang ◽  
Yansheng Qiu ◽  
Xinsheng Jiang ◽  
...  
Keyword(s):  
South China ◽  
Rift Basin ◽  
Yangtze Block ◽  
Nanhua Rift

scholarly journals Sedimentary Setting and Ore-Forming Model in the Songtao Manganese Deposit, Southwestern China: Evidence from Audio-Frequency Magnetotelluric and Gravity Data

Minerals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1273
Author(s):  
Lingfeng Gao ◽  
Shan Xu ◽  
Xiangyun Hu ◽  
Shuang Liu ◽  
Qi Zhou ◽  
...  
Keyword(s):  
South China ◽  
Gravity Data ◽  
High Resistivity ◽  
Manganese Ore ◽  
Rift Basin ◽  
Audio Frequency ◽  
Manganese Deposit ◽  
Low Resistivity ◽  
Manganese Deposits ◽  
Nanhua Rift

The break-up of the supercontinent Rodinia in the late Neoproterozoic led to the formation of the Nanhua rift basin within the South China Block. The Datangpo-type manganese deposit, which developed in the Nanhua rift basin, is one of the most important types of manganese deposits in South China. Although it is widely accepted that deep sedimentary structures significantly affect the manganese ore system, the relationship between the manganese deposits in South China and the Nanhua rifting process is still unclear. The origin of the manganese ore layer remains controversial. In this paper, we integrated the audio-frequency magnetotelluric (AMT) data, gravity data, and comprehensive geological and borehole data analysis to characterize the structure of the Datangpo-type manganese deposit in Songtao, Guizhou Province. The resistivity and density models produced an inclined layered structure, which correlated well with the coeval sediment strata of the Nanhua rift basin. A high-resistivity cap was observed from the surface to a depth of 800 m, corresponding to the Cambrian Loushanguan (ϵ3−4ls) and Palang dolomite formation (ϵ2p), which has helped the storage of the manganese ore. The most significant low-resistivity anomaly (25–40 Ω·m) resides at a depth of 1400 m in the Nantuo (Nh3n) gravel sandstone and Datangpo (Nh2d) silty and carbonaceous shale, corresponding to the ore-forming layer. This distinct low-resistivity layer was possibly produced by aqueous fluids and pyrite in the syn-sedimentary fault and alteration zone. The accumulations of sulfide minerals in the rock samples suggest a possible anoxic-euxinic deposition environment during the manganese mineralization and precipitation. The fault revealed in the resistivity models is perhaps a previous fault zone produced by extension in the Nanhua rifting process, which provided migration and upwelling channels for ore-forming minerals. Based on our resistivity models, density models, and geological survey, the manganese ore-forming model was derived, which can help to provide geophysical evidence for the origin of the Datangpo-type manganese deposit.

Possible source rocks of Mesozoic granites in South Korea: implications for crustal evolution in NE Asia

2004 ◽  
Vol 95 (1-2) ◽  
pp. 181-198 ◽  
Author(s):  
Yong-Joo Jwa
Keyword(s):  
South Korea ◽  
Source Rocks ◽  
Isotopic Signatures ◽  
The North ◽  
Basement Rocks ◽  
Depleted Mantle ◽  
Gyeonggi Massif ◽  
Okcheon Belt ◽  
Yeongnam Massif ◽  
Middle Proterozoic

ABSTRACTThe exposed Precambrian cratonic crust in South Korea is divided into two massifs – the Gyeonggi massif to the north and the Yeongnam massif to the south. Mesozoic granites intruded into both massifs and are mostly I-types. The Jurassic granites form extensive deep-seated batholiths, the Triassic granites are deep-seated stocks and the Cretaceous granites occur as volcanic-plutonic complexes.The systematic variation of εNd and SrI in the Korean Mesozoic granites could result from the mixing of two components in different proportions to produce the source of the granites. Although most Mesozoic I-type granites were apparently derived from more juvenile crust, the old evolved crustal components seem to have been incorporated in the magmas in various proportions. Mantle–crust mixing can account for the generation of the source of the Triassic and Cretaceous granites in the Gyeongsang basin. On the other hand, crust–crust mixing can feasibly produce the source of the Triassic and Jurassic granites in the Yeongnam massif, the Jurassic granites in the Gyeonggi massif, and the Cretaceous granites in the Yeongdong–Gwangju basin and the Okcheon belt. However, some Jurassic granites in the Yeongnam massif and Cretaceous granites in the Yeongdong–Gwangju basin can be also explained by the mantle–crust mixing. Combined geochemical and isotopic signatures indicate that a simple binary mixing model is inadequate to explain both the geochemical and isotopic data. The chemistry of the granites is considered likely to reflect the composition of the igneous protolith that derived from depleted mantle, which explains why most Mesozoic granites in South Korea are represented by I-types, regardless of their temporal and spatial position. Nd-Sr isotopic signatures of the Mesozoic granites and basement rocks indicate that the continental crust beneath the Korean peninsular is vertically structured by the successive underplating of mantle-derived materials. It is postulated that the crust is vertically stratified from the surface to the lowermost crust with late Archean to early Proterozoic, early to middle Proterozoic (ca. 1·9 Ga), middle Proterozoic (ca. 1·5 Ga), and late Proterozioc (younger than 1·5 Ga) components.

The Armies of East Asia: China, Taiwan, Japan and the Koreas. By Dennis Van Vranken Hickey. Boulder, CO: Lynne Rienner, 2001. 280p. $55.00.

2002 ◽  
Vol 96 (3) ◽  
pp. 688-689
Author(s):  
Mary P. Callahan
Keyword(s):  
South China Sea ◽  
South Korea ◽  
Natural Resources ◽  
East Asia ◽  
South China ◽  
Arms Race ◽  
Security Threats ◽  
Republic Of China ◽  
The Republic ◽  
North And South

This book is a detailed study of recent changes in security threats and defense forces in China, Taiwan, Japan, South Korea, and North Korea. The author argues that East Asia is in the midst of an arms race “of unprecedented scale” (p. 231). The major threats (“flashpoints”) in the region are the tensions between North and South Korea, the conflict between the People's Republic of China and the Republic of China over the future of Taiwan, and the competing claims to oil and other natural resources in the South China Sea. The range and character of these threats have not changed appreciatively in recent years, but what has changed are capabilities of militaries to project power, threaten neighbors, and destabilize the region.

Biting the Cow’s Tongue: Securitization and Capacity Building in the South China Sea

2016 ◽  
Vol 3 (3) ◽  
pp. 269-290 ◽  
Author(s):  
Zenel Garcia ◽  
Thomas A. Breslin
Keyword(s):  
South China Sea ◽  
South Korea ◽  
Capacity Building ◽  
South China ◽  
The South China Sea ◽  
The South ◽  
Regional Powers ◽  
China Sea ◽  
Strategic Competition ◽  
Security Challenges

The South China Sea (SCS) territorial disputes have become one of the most significant security challenges in the East Asian Supercomplex (EAS). Described in Buzan and Wæver’s classic study as a Great Power Bipolar Supercomplex defined by China and Japan, the emergence and actions of South Korea and Indonesia as regional powers have rendered the EAS multipolar and unusually volatile. As the hierarchy in the EAS transforms into a multipolar one, the securitization of China has allowed Japan and South Korea to facilitate the capacity building efforts of Southeast Asian states at the expense of China. As a result, the littoral states surrounding the SCS have taken advantage of this strategic competition in order to advance their own interests.

Coping with China’s rise

2016 ◽  
Vol 2 (1) ◽  
pp. 3-23 ◽  
Author(s):  
Chung-In Moon ◽  
Seung-chan Boo
Keyword(s):  
South China Sea ◽  
South Korea ◽  
South China ◽  
Domestic Politics ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
China’S Rise ◽  
The Us ◽  
China's Rise

The new emerging hegemonic rivalry between China and the US has placed South Korea in serious adjustment dilemma. Being sandwiched between the two giants, Seoul has been trying to muddle through their conflicting interests. This article aims to explore how China’s rise and rivalry with the US have influenced Seoul’s domestic politics and resulted in policy choices, through the examination of three cases: THAAD (the Terminal High Altitude Air Defense System), the AIIB (Asia Infrastructure Investment Bank), and the South China Sea. Our findings show that South Korea’s adjustment behavior has varied across issue areas. On the issue of security, the Seoul government has taken a pro-American balancing strategy by allowing the deployment of the US THAAD, whereas it has chosen a reluctant pro-China bandwagoning position by joining the AIIB. And it has taken a rather neutral position on the South China Sea dispute. Such variations can be explained by the changing interests and underlying domestic politics and leadership choices in South Korea.

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