NDLI: Nd and Sr Isotopic Signatures of Mesozoic Granitoids in South Korea

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Nd and Sr Isotopic Signatures of Mesozoic Granitoids in South Korea

Content Provider	Semantic Scholar
Author	Park, Seong Sook Na, Choon Ki
Copyright Year	1996
Abstract	Mesozoic granitic plutons in the Korean peninsula have ƒÃNd values ranging from -14.9 to +0.4 and initial 87Sr/86Sr ratios from 0 .704 to 0.717 (ƒÃSr=-2.5•`183.7). The Nd and Sr isotopic variations in the granitic rocks are inversely correlated and are clearly divided into two distinct groups namely: a mantle type as in the Mesozoic Kyongsang basin and a crust type as in the Precambrian terranes, based on geologic and geographic differences. Cretaceous granitic rocks in the Kyongsang sedimentary basin have ƒÃNd of -4.4 to +0.4 and initial 87Sr/86Sr ratios of 0.704 to 0.706 (ƒÃSr=-2.5•`33.5), indicating derivatives of the mantle source. While, andesitic rocks in the basin have Nd-Sr isotopic compositions (EM=-12.6•`-0.8, (87Sr/86Sr)i=0.705•`0.707, ƒÃSr= 9.4•`38.9) similar with those of the Cretaceous plutonic rocks, implying cogenetic sources of the magma. On the other hand, Jurassic plutons from outside of the basin, including some Cretaceous granites in the Okchon geosynclinal zone, have much lower ƒÃNd of -21.0 to -13.6 and higher initial 87Sr/86Sr ratios of 0.711 to 0.717 (ƒÃSr= 97.3•`183.7) than the Cretaceous plutons in the Kyongsang basin, which suggests a significant crustal assimilation or contamination of the granitic magma. The two stage model ages of the Cretaceous and Jurassic granite plutons were calculated to be 0.5 to 1.1 Ga and 1.6 to 2.2 Ga, respectively. This data suggests that the source materials of these Mesozoic plutons in the Korean peninsula have evolved considerably since mid Proterozoic times.
Starting Page	215
Ending Page	226
Page Count	12
File Format	PDF HTM / HTML
DOI	10.11456/shigenchishitsu1992.46.215
Volume Number	46
Alternate Webpage(s)	https://www.jstage.jst.go.jp/article/shigenchishitsu1992/46/258/46_258_215/_pdf
Alternate Webpage(s)	https://doi.org/10.11456/shigenchishitsu1992.46.215
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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