Cretaceous igneous activity and tectonic evolution of the northeast Asia including the Korean Peninsula

2021 ◽  
Vol 57 (4) ◽  
pp. 589-614
Author(s):  
Seung Hwan Lee ◽  
Chang Whan Oh ◽  
Kenta Kawaguchi
Keyword(s):  
Korean Peninsula ◽  
Tectonic Evolution ◽  
Northeast Asia ◽  
Igneous Activity

scholarly journals Jurassic Igneous Activity in the Yuseong Area on the Southern Margin of the Gyeonggi Massif, Korean Peninsula, and Its Implications for the Tectonic Evolution of Northeast Asia during the Jurassic

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 466
Author(s):  
Seung Hwan Lee ◽  
Chang Whan Oh ◽  
Soolim Jung
Keyword(s):  
Korean Peninsula ◽  
Tectonic Setting ◽  
Northeast Asia ◽  
Crustal Contamination ◽  
Igneous Rocks ◽  
Volcanic Arc ◽  
Southern Margin ◽  
Igneous Activity ◽  
Gyeonggi Massif ◽  
Okcheon Belt

Jurassic dioritic to granitic igneous rocks extensively intrude into the southern Korean Peninsula, including the Yuseong area located at the boundary between the southern margin of the Gyeonggi Massif and the northern margin of the Okcheon Belt. In this study, the petrogenesis and sources of Jurassic igneous rocks in the Yuseong area were investigated. The U–Pb zircon age data from the Jurassic plutonic rocks in the Yuseong area give two igneous ages, ca. 178–177 Ma and 169–168 Ma, indicating that two stages of igneous activity occurred in the Yuseong area during the Jurassic. The geochemical characteristics of Jurassic diorites indicate that they originated from enriched mid-ocean ridge basalt (E-MORB; Nb/Yb = 5.63–7.27; Zr/Yb = 118–156). The enriched Th/Yb ratios (5.5–8.0) in the diorites imply that they experienced crustal contamination during magma ascent. The Jurassic granitoids in the Yuseong area are divided into I- and S-type granites. The Jurassic I-type granitoids may have formed via the partial melting of mafic rocks with mixtures of 10–40% pelite-derived melt, while the S-type granites originated from felsic pelite. The Jurassic diorites have low Nb/Th ratios with depletion of the Nb and Ta components, indicating that they formed in a volcanic arc tectonic environment. On the other hand, the Jurassic granitoids show two different tectonic environments: a volcanic arc, and a syncollisional environment. The granites with syncollisional character are S-type granites, and may give incorrect information about tectonic setting because of the changes in the trace elements of the S-type granite due to fractional crystallization. Early Jurassic (200–190 Ma) igneous rocks are distributed only in the southeastern Korean Peninsula, including the Yeongnam Massif; Jurassic igneous rocks formed at ca. 190–180 Ma occur mainly in the Okcheon Belt and southern Gyeonggi Massif, which includes the Yuseong area. Middle Jurassic igneous rocks widely intruded from the Okcheon Belt, through the Gyeonggi and Nangrim massifs in the Korean Peninsula, to the Liaoning area in the North China Craton at 180–160 Ma. This distribution pattern of the Jurassic granitoids suggests that flat subduction started after 180 Ma in Northeast Asia.

scholarly journals DPRK'S nuclear program

2020 ◽  
Vol 6 (Extra-A) ◽  
pp. 15-22
Author(s):  
Liailia Aidarovna Gainullina ◽  
Rustem Ravilevich Muhametzyanov ◽  
Bulat Aidarovich Gainullin ◽  
Nadiia Almazovna Galiautdinova
Keyword(s):  
Korean Peninsula ◽  
Northeast Asia ◽  
Republic Of Korea ◽  
Past Century ◽  
Nuclear Program ◽  
Korean People ◽  
Existing Problems ◽  
The Past ◽  
The North ◽  
Bilateral Relations

Historically, in the eyes of the Korean people, Japan is an antagonistic state that has brought them many troubles in the past century. Relations between Japan and the Democratic People’s Republic of Korea (DPRK) are fundamental in terms of security in the Northeast Asia (NEA) region, since the decision on the DPRK nuclear missile program and on the denuclearization of the Korean Peninsula is one of the pillars of achieving that very security throughout the region. The period, we consider in this study, from 1996 to 2006, is of significant importance, since a thorough analysis of the events of those years is important for understanding the root of existing problems in bilateral relations between Japan and North Korea. The present analysis on the behavioral lines in the solution of the North Korean nuclear missile program may contribute to the choice the best way to normalize relations between the two countries.    

A Pawn in the Great Game: Chosŏn’s Rapprochement with the Russian Empire Amidst the British Seizure of Kŏmundo, 1884–1886

2021 ◽  
pp. 189-212
Author(s):  
Daria Grishina
Keyword(s):  
Korean Peninsula ◽  
Northeast Asia ◽  
Russian Empire ◽  
Primary Sources ◽  
Korean And English ◽  
The Russian Empire ◽  
Great Game ◽  
Do So

The paper examines the Chosŏn government’s rapprochement with the Russian Empire performed against the backdrop of the British seizure of Kŏmundo (1885– 1887). Two attempts of Russo-Chosŏn rapprochement, carried out in the summer of 1885 and summer of 1886, are analyzed separately and against the wider geopolitical situation in Northeast Asia and on the Korean peninsula of the time. To do so, the author relies on the analysis of Russian, Korean, and English primary sources to reveal the Russian and Chosŏn government’s standing at that time, and the geopolitical reasons behind the failure of Russo-Chosŏn rapprochement.

scholarly journals Radiocarbon and Archaeology in Japan and Korea: What has Changed Because of the Yayoi Dating Controversy?

Radiocarbon ◽  
2010 ◽  
Vol 52 (2) ◽  
pp. 421-427 ◽  
Author(s):  
Shin'ya Shoda
Keyword(s):  
Korean Peninsula ◽  
Northeast Asia ◽  
Radiocarbon Dates ◽  
South Korean ◽  
Asian Region ◽  
Archaeological Materials ◽  
Northeast Asian

Since the sensational 2003 announcement that pushed the start of the Yayoi period back by 500 yr, archaeologists working on 1st millennium BC material from northeast Asia have had to switch from the older short chronology to a new long chronology. However, this change need not apply to the entire northeast Asian region as China's chronology is tied to written records. The timeline of the Korean peninsula, intermediate between the Chinese and Japanese ones, needs to be reexamined. The chronology of the 1st millennium BC in the Korean peninsula is still in dispute, in part because many of the radiocarbon dates lack clear archaeological contexts. This paper shows that a reliable typological relationship observed in archaeological materials existed at this time linking northeast Asia from China to Japan. This paper includes absolute dates based on the initial AMS 14C measurements of charred crops from South Korean sites.

Regionalism and Critical Junctures: Explaining the “Organization Gap” in Northeast Asia

2004 ◽  
Vol 4 (2) ◽  
pp. 191-226 ◽  
Author(s):  
Kent Calder ◽  
Min Ye
Keyword(s):  
Korean Peninsula ◽  
Northeast Asia ◽  
Macro Level ◽  
Economic Success ◽  
Economic Management ◽  
Critical Junctures ◽  
The World ◽  
Micro Level ◽  
Missile Proliferation

Northeast Asia, where the interests of three major nuclear powers and the world's two largest economies mingle around the unstable pivot of the Korean Peninsula, is a region rife with political and economic uncertainties. It is arguably one of the most dangerous areas in the world, plagued by security problems of global importance, including nuclear and missile proliferation. It has, to be sure, been widely touted as a region of economic promise. Yet despite Northeast Asia's demonstrable economic success at the macro level, and a panoply of highly regarded individual economic managers at the micro level, its collective economic management has nevertheless been disappointing.

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