Mesozoic granitic rocks of South Korea : Trace element evidence regarding their differentiation. 2 REE patterns.

Tsusue, Akio; Mizuta, Toshio; Tamai, Toshiyuki; Kim, Sang Wook

doi:10.2465/ganko1941.82.23

Cited by 7 publications

(8 citation statements)

References 8 publications

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“…5A and 5B). Very similar relationships in the granitic rocks of Southwest Japan (Tsusue et al, 1988) are plot ted in the same diagram (Figs. 6A and 6B).…”

Section: Rare Earth Element Patterns Of Mesozoic and Tertiary Granitoidssupporting

confidence: 49%

“…Although we have already published our trace element data for the granitoids of South Korea and Southwest Japan, and we have inter preted rare earth element (REE) patterns and Ba, Rb and Sr relationships of granitoids (Tsusue et al, 1986(Tsusue et al, , 1987a(Tsusue et al, , 1987b(Tsusue et al, , 1988, we in tend to summarize briefly the trace element data of these rock types for South Korea and Southwest Japan in this article.…”

Section: Introductionmentioning

confidence: 99%

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Mode of differentiation of granitic magmas in South Korea and Southwest Japan.

1989

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From the rare earth element (REE) patterns and Ba, Rb, and Sr relationships of granitoids of South Korea and Southwest Japan, we have found two types of granitoid magmas. These are: 1) Granitoid magmas mainly differentiated by the process of fractional crystallization. These are typified by the Cretaceous granitoids of South Korea and the granitoids younger than Cretaceous in Southwest Japan; and 2) Granitoid magmas formed by the process of partial melting of the lower continental crust in the presence of hornblende, or derived by the process of fractional crystallization of quartz dioritic magmas with removal of hornblende. These are typified by the Jurassic granitoids of South Korea.

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“…5A and 5B). Very similar relationships in the granitic rocks of Southwest Japan (Tsusue et al, 1988) are plot ted in the same diagram (Figs. 6A and 6B).…”

Section: Rare Earth Element Patterns Of Mesozoic and Tertiary Granitoidssupporting

confidence: 49%

Section: Introductionmentioning

confidence: 99%

Mode of differentiation of granitic magmas in South Korea and Southwest Japan.

1989

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“…To my knowledge, systematic data on REEs of granitic rocks distributed around the Kamioka and Yoshiwara-Sannotake deposits are scarce. Thus as a substitution, the REE patterns of granitic rocks of southwest Japan (Tsusue et al, 1987) are given in Figure 7. The patterns indicate that the granitic rocks generally show no Ce anomaly and a significant negative Eu anomaly, and have relatively high (La/Yb) cn ratios varying from 3.3 to 8.3.…”

Section: Rees Of Hydrothermal Fluids Of Magmatic Water Originmentioning

confidence: 99%

“…7 Chondrite-normalized REE patterns of magmatic water and equilibrated granitic rock. Data on granitic rocks are from Tsusue et al (1987).…”

Section: Sample/chondritementioning

confidence: 99%

Rare Earth Elements as an Indicator to Origins of Skarn Deposits: Examples of the Kamioka Zn‐Pb and Yoshiwara‐Sannotake Cu(–Fe) Deposits in Japan

Kato

1999

Resource Geology

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: Systematic data of rare earth elements (REEs) are presented in order to put some constraints on the origin of hydrothermal fluids responsible for two contrastive skarn deposits in Japan; the Kamioka Zn‐Pb and Yoshiwara‐Sannotake Cu(‐Fe) deposits. Carbon and oxygen isotopic studies have demonstrated that the hydrothermal fluids responsible for the Kamioka Zn‐Pb deposits are of meteoric water origin whereas those for the Yoshiwara‐Sannotake Cu(‐Fe) deposits are of magmatic water origin. The REE abundances of epidote skarn derived from aluminous rocks, garnet and clinopyroxene in calcic exoskarn derived from limestone, and interstitial calcite associated with sulfide minerals were determined for these contrastive skarn deposits by inductively‐coupled plasma mass spectrometry (ICP‐MS). A significant difference in the REE concentrations is not found between epidote skarn and aluminous original rock (plagioclase‐clinopyroxene rock, called Inishi rock) from the Kamioka Zn‐Pb deposits, indicating that the REEs are generally immobile during the formation of epidote skarn, and that the REE concentrations of the hydrothermal fluid are considerably low relative to the aluminous original rock. In contrast, the epidote skarn exhibits enrichment of Eu with increasing total REE concentrations relative to the aluminous original rock (quartz diorite) in the Yoshiwara‐Sannotake Cu(‐Fe) deposits, implying a contribution of magmatic fluid derived from granitoids during the skarn formation. Limestone generally has much lower REE concentrations related to surrounding aluminous rocks, and thus the REE concentrations of garnet and clinopyroxene in calcic exoskarn, originated from limestone, are variable due to the interaction with the hydrothermal fluids. The chondrite‐normalized REE patterns of garnet, clinopyroxene, and interstitial calcite exactly provide useful information on origins of hydrothermal fluids. The REE patterns of these minerals from the Kamioka Zn‐Pb deposits show lower (Pr/Yb)cn ratios, and negative Ce and Eu anomalies inherited from limestone with the decrease of This suggests that the hydrothermal fluids responsible for the Kamioka Zn‐Pb deposits were depleted in REEs, and were not magmatic water in origin, but presumably meteoric one. In striking contrast, the REE patterns of exoskarn minerals and calcite from the Yoshiwara‐Sannotake Cu(‐Fe) deposits exhibit a positive Eu anomaly, and high (Pr/Yb)cn ratios with the considerable increase of σREE and the disappearance of negative Ce anomaly, implying that the fluids were dominantly of magmatic origin. The REE indices are very likely to be an excellent indicator to origins of the skarn deposits.

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“…It has long been argued that the Mesozoic Korean granites were formed either by partial melting of the old crustal material during the Jurassic, or by fractional crystallisation of mafic magma that originated from younger igneous protoliths during the Cretaceous (Shimazaki & Lee 1981;Tsusue et al 1986;Hong 1987). However, this was not supported by the geochemical nature of source rocks for the granites.…”

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confidence: 99%

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

Jwa

2004

Earth and Environmental Science Transactions of the Royal Socie

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The 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 Nd 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. Mantlecrust 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.

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Mesozoic granitic rocks of South Korea : Trace element evidence regarding their differentiation. 2 REE patterns.

Cited by 7 publications

References 8 publications

Mode of differentiation of granitic magmas in South Korea and Southwest Japan.

Mode of differentiation of granitic magmas in South Korea and Southwest Japan.

Rare Earth Elements as an Indicator to Origins of Skarn Deposits: Examples of the Kamioka Zn‐Pb and Yoshiwara‐Sannotake Cu(–Fe) Deposits in Japan

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

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