Isotope Geochemistry of Volcanic Rocks from the Barton Peninsula,King George Island,Antarctica

被引：1

作者：

Jeong Hwang ^{[1
]}

郑祥身 ^{[2
]}

Edward M Ripley ^{[3
]}

JongIk Lee ^{[4
]}

Dongbok Shin ^{[5
]}

机构：

[1] Department of Geological Engineering, Daejeon University

[2] Institute of Geology and Geophysics, Chinese Academy of Sciences

[3] Department of Geological Sciences, Indiana University

[4] Korea Polar Research Institute

[5] Department of Geological Sciences, Kongju University

来源：

Journal of Earth Science | 2011年 / 22卷 / 01期

关键词：

isotope; volcanic rock; high temperature alteration; Antarctica;

D O I：

暂无

中图分类号：

P597 [同位素地质学与地质年代学];

学科分类号：

070902 ;

摘要：

C, O, H, S and Sr isotopes were investigated to characterize the isotopic composition of the Paleocene-Eocene volcanic rocks in Barton Peninsula, King George Island, Antarctica. The analyzed samples of volcanic rocks cover a range from basalt to andesite. The δ13C and δ18O values of calcite in volcanic rocks range from -7.5‰ to -3.2‰ and 0.4‰ to 5.1‰, respectively. The homogenous δ13Ccal and depleted δ18Ocal values relative to primary magmatic values reflect the effect of high temperature alteration of volcanic rocks. The δ18O of volcanic rocks ranges from -1.1‰ to 7.2‰, and the majority of values are significantly lower than those of primary magmatic values. The low δ18OWR values are compatible with high temperature alteration. The initial values of 87Sr/86Sr of volcanic rocks span a narrow range from 0.703 312 to 0.703 504 which belong to the present mid-oceanic ridge basalt. The values of 87Sr/86Sr of volcanics in the Barton Peninsula are similar to those determined in the Fildes Peninsula, King George Island. The δDWR and H2O contents of volcanic rocks range from -74‰ to -66‰ and 0.67 wt.% to 2.74 wt.%, respectively. The higher δDWR and H2O wt.% of volcanic rocks relative to fresh basalts also result from high temperature alteration. Sulfur isotope compositions of the volcanic rocks range from -12.5‰ to -7.0‰; these values may represent fractionation accompanying partial oxidation of magmatic S or incorporation of some bacteriogenic sulfide. The low S contents and negative correlation with C and H2O reflect the formation of calcite and breakdown of sulfide as a result of high temperature water-rock interaction.

引用

页码：40 / 51

页数：12

共 11 条

[1]

Hydrothermal alteration and isotopic variations of igneous rocks in Barton Peninsula, King George Island, Antarctica[J] . Dongbok Shin,Jong-Ik Lee,Jeong Hwang,Soon-Do Hur.Geosciences Journal . 2009 (1)

[2]

A complete oxygen isotope profile through the lower oceanic crust, ODP Hole 735B[J] . Yongjun Gao,Jochen Hoefs,Reinhold Przybilla,Jonathan E. Snow.Chemical Geology . 2006 (3)

[3]

Thermal metamorphism of volcanic rocks on Barton Peninsula, King George Island, Antarctica[J] . Hyeoncheol Kim,Moonsup Cho,Jong-Ik Lee.Geosciences Journal . 2002 (4)

[4]

Analysis of sulfides in whole rock matrices by elemental analyzer–continuous flow isotope ratio mass spectrometry[J] . S.A Studley,E.M Ripley,E.R Elswick,M.J Dorais,J Fong,D Finkelstein,L.M Pratt.Chemical Geology . 2002 (1)

[5]

Sulfur isotope systematics of basaltic lavas from Indonesia: implications for the sulfur cycle in subduction zones[J] . J.C.M. de Hoog,B.E. Taylor,M.J. van Bergen.Earth and Planetary Science Letters . 2001 (3)

[6]

Oxygen isotope systematics of the Banda Arc: low δ 18 O despite involvement of subducted continental material in magma genesis[J] . P.Z Vroon,D Lowry,M.J van Bergen,A.J Boyce,D.P Mattey.Geochimica et Cosmochimica Acta . 2001 (4)

[7]

Strontium and oxygen isotopic constraints on fluid mixing, alteration and mineralization in the TAG hydrothermal deposit[J] . Damon A.H Teagle,Jeffrey C Alt,Hitoshi Chiba,Susan E Humphris,Alex N Halliday.Chemical Geology . 1998 (1)

[8]

Acid sulphate alteration in a magmatic hydrothermal environment, Barton Peninsula, King George Island, Antarctica[J] . Debbie C. Armstrong.Mineralogical Magazine . 1995 (3)

[9]

O and H stable isotope compositions of oceanic crust and upper mantle rocks exposed in the Hess Deep near the Galapagos Triple Junction[J] . Pierre Agrinier,Roger Hékinian,Daniel Bideau,Marc Javoy.Earth and Planetary Science Letters . 1995 (3)

[10]

Oxygen isotope heterogeneity of the mantle deduced from global 18 O systematics of basalts from different geotectonic settings[J] . Russell S. Harmon,Jochen Hoefs.Contributions to Mineralogy and Petrology . 1995 (1)

← 1 2 →