S.-T. Kwon

Hyundai Motor Group (South Korea)

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G. R. Tilton

University of California, Santa Barbara

James R. Boles

University of California, Santa Barbara

Ching-Ying Lan

Hechi University

Frederick A. Frey

Massachusetts Institute of Technology

Seok‐Hwi Hong

Korea Institute of Geoscience and Mineral Resources

Mark Feldman

University of California, Santa Barbara

R. P. Sage

Sault Area Hospital

Allen Kennedy

Curtin University

Taesam Lee

Gyeongsang National University

H. B. West

Science Applications International Corporation (United States)

Cooperative Institutions

Carleton University

Massachusetts Institute of Technology

University of California, Santa Barbara

California Institute of Technology

Institute of Earth Sciences, Academia Sinica

Yonsei University Health System

Planetary Science Institute

Technische Universität Berlin

V.I. Vernadsky Institute of Geochemistry and Analytical Chemistry

Siberian Branch of the Russian Academy of Sciences

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The isotopic composition of postshield lavas from Mauna Kea volcano, Hawaii

Earth and Planetary Science Letters (1991)

Allen Kennedy S.-T. Kwon Frederick A. Frey H. B. West

Mantle plume

10.1016/0012-821x(91)90171-d

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Citations (43)

Age and radiogenic isotopic systematics of the Borden carbonatite complex, Ontario, Canada

Canadian Journal of Earth Sciences (1987)

Keith Bell John Blenkinsop S.-T. Kwon G. R. Tilton R. P. Sage

Rb–Sr and U–Pb data from the Borden complex of northern Ontario, a carbonatite associated with the Kapuskasing Structural Zone, indicate a mid-Proterozoic age. A 207 Pb/ 206 Pb age of 1872 ± 13 Ma is interpreted as the emplacement age of this body, grouping it with other ca. 1900 Ma complexes that are the oldest known carbonatites associated with the Kapuskasing structure. A 206 Pb– 238 U age of 1894 ± 29 Ma agrees with the Pb–Pb age but has a high mean square of weighted deviates (MSWD) of 42. A Rb–Sr apatite–carbonate–mica whole-rock isochron date of 1807 ± 13 Ma probably indicates later resetting of the Rb–Sr system.An ε Sr (T) value of −6.2 ± 0.5 ( 87 Sr/ 86 Sr = 0.70184 ± 0.00003) and an ε Nd (T) value of +2.8 ± 0.4 for Borden indicate derivation of the Sr and Nd from a source with a time-integrated depletion in the large-ion lithophile (LIL) elements. These closely resemble the ε values for Sr and Nd from the Cargill and Spanish River complexes, two other 1900 Ma plutons. The estimated initial 207 Pb/ 204 Pb and 206 Pb/ 204 Pb ratios from Borden calcites plot significantly below growth curves for average continental crust in isotope correlation diagrams, a pattern similar to those found in mid-ocean ridge basalts (MORB) and most ocean-island volcanic rocks, again suggesting a source depleted in LIL elements. The combined Nd and Sr, and probably Pb, data strongly favour a mantle origin for the Borden complex with little or no crustal contamination and support the model of Bell et al. that many carbonatites intruded into the Canadian Shield were derived from an ancient, LIL-depleted subcontinental upper mantle.

Carbonatite

Radiogenic nuclide

Isochron dating

10.1139/e87-003

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Citations (33)

Petrology and geochemistry of the Seoul granitic batholith

The Journal of the Petrological Society of Korea (1994)

S.-T. Kwon D L Cho Ching-Ying Lan K.B. Shin T Lee

We report field relationship, petrography and major and trace element chemistry for the central part of the Seoul granitic bathlith of Jurassic age occurring in the Kyonggi massif. The batholith consists mainly of biotite granite (BG) and garnet biotite granite (GBG) with minor tonalite-quartz diorite and biotite granodiorite with or without hornblende. The mode data, along with the those reported by Hong (1984) for the biotite granite (south-BG) in the southern part of the batholith, indicate that the many of BGs and majority of GBG and south-BG are leucocratic. Major element data indicate that these predominant rocks of the batholith are peraluminous. Variation trends in Harker diagrams for the major and trace elements suggest that the BG and GBG are not related by a simple crystal fractionation process. The same is true between the central (BG and GBG) and the southern (south-BG) parts of the batholith, suggesting that the central and southern parts of the Seoul batholith may consist of three separate intrusions. Tectonic discriminations using major and trace element data and the age of emplacement suggest that the batholith represents Jurassic plutonism related to an orogeny, perhaps to a subduction-related continental magmatic arc.

Batholith

Continental arc

Hornblende

Diorite

Orogeny

Massif

Trace element

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Citations (6)

Geochemical and isotopic studies of the Cretaceous igneous rocks in the Yeongdong Basin, Korea: Implications for the origin of magmatism in pull-apart basin

Geosciences Journal (2001)

H. Sagong S.-T. Kwon Chang Sik Cheong Sung Hi Choi

Petrogenesis

10.1007/bf02910303

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Citations (14)

Diagenetic mass transport in the southern San Joaquin basin, California, U.S.A.: Implications from the strontium isotopic composition of modern pore fluids

Chemical Geology (1993)

Mark Feldman S.-T. Kwon James R. Boles G. R. Tilton

Radiogenic nuclide

Isotopes of strontium

δ18O

10.1016/0009-2541(93)90327-f

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Citations (13)

Contrasting TiO₂/MgO ratios in the Namwon granitic complex

The Journal of the Petrological Society of Korea (1993)

S.-T. Kwon Seok‐Hwi Hong

We report adventages of employing MgO as a differentiation index for the Namwon granitic complex. It is shown to be much more sensitive than the usual Harker index. The complex can be divided into two groups on the basis of /MgO ratio. The low /MgO group consists of hornblende biotite tonalite-granodiorite, porphyritic hornblende biotite granodiorite (PHBGd) and part of biotite granite (loBG). PHBGd shows its own distinct variation in the low group. This group is characterized in most cases by the presence of hornblende, even if it occurs as a trace amount. The high /MgO group consists of part of biotite granite (hiBG) and two mica granite. The major element differences between rock types are also apparent in biotite chemistry. These chemical data indicate that at least two distinct origins of magma are rquired for the complex. Two kinds of biotite granite revealed in this study show distinct geographic distribution, suggesting that a new geologic map should be made.

Hornblende

Porphyritic

Igneous differentiation

Trace element

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Citations (2)

Isotopic evidence for crust-mantle evolution with emphasis on the Canadian Shield

Chemical Geology (1990)

G. R. Tilton S.-T. Kwon

Carbonatite

Lithophile

Radiogenic nuclide

Radiometric dating

Crustal recycling

10.1016/0009-2541(90)90277-e

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Citations (41)

Strontium-isotope study of pore waters in San Joaquin basin, California

AAPG Bull.; (United States) (1988)

S.-T. Kwon James R. Boles G. R. Tilton

Nineteen pore-water samples from the late Miocene and younger marine formations were analyzed for strontium contents and isotopic compositions. All samples have /sup 87/Sr//sup 86/Sr ratios lower than the late Miocene seawater value (0.7090). The strontium values in many of these waters reflect silicate rather than carbonate reactions. In general, the strontium contents and isotopic ratios of the pore waters are related to the depth and location of the oil fields. The strontium contents as a whole show a tendency to increase with depth, although /sup 87/Sr//sup 86/Sr ratios have no simple depth relationship. The strontium contents and isotopic compositions of the pore waters fall into five groups related to geographic locations. This suggests localized evolution of pore waters in a given area and limited movement of these subsurface waters.

Isotopes of strontium

San Joaquin

Strontium-90

Source

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Citations (0)

Crust-mantle evolution in the Canadian shield

Chemical Geology (1988)

G. R. Tilton S.-T. Kwon

Greenstone belt

Imbrication

10.1016/0009-2541(88)90407-x