PETROGENESIS OF LATE CENOZOIC VOLCANIC-ROCKS FROM THE TAUPO VOLCANIC ZONE, NEW-ZEALAND, IN THE LIGHT OF NEW LEAD ISOTOPE DATA

被引:67
作者
GRAHAM, IJ
GULSON, BL
HEDENQUIST, JW
MIZON, K
机构
[1] CSIRO, CTR ISOTOPE STUDIES, DIV EXPLORAT GEOSCI, N RYDE, NSW 2113, AUSTRALIA
[2] GEOL SURVEY JAPAN, DEPT MINERAL RESOURCES, TSUKUBA 305, JAPAN
关键词
D O I
10.1016/0016-7037(92)90360-U
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Lead isotopes and U/Pb concentrations have been measured for a wide range of volcanic rocks from the Taupo Volcanic Zone (TVZ), New Zealand. Combined geochemical and isotope plots suggest that the majority of mafic-intermediate volcanic rocks result from contamination (AFC) of primitive basalt by Mesozoic metasedimentary basement. Lead isotope data indicate that some previously published petrogenetic models require modification, notably in the choice of parental magma and in the composition and proportion of the crustal assimilant. Evidence is also presented to show that the voluminous ignimbrites and rhyolites of the TVZ could be derived by melting of early-formed andesites (with accompanying minor crustal contamination) and rule out previous models such as direct melting of Mesozoic basement rocks or contamination of mantle derived melts.
引用
收藏
页码:2797 / 2819
页数:23
相关论文
共 96 条
[1]  
[Anonymous], 1986, J ROY SOC NEW ZEAL
[2]  
AOKI K, 1982, AM MINERAL, V67, P1
[3]   ISLAND-ARC MAGMA SOURCES - A GEOCHEMICAL ASSESSMENT OF THE ROLES OF SLAB-DERIVED COMPONENTS AND CRUSTAL CONTAMINATION [J].
ARCULUS, RJ ;
JOHNSON, RW .
GEOCHEMICAL JOURNAL, 1981, 15 (03) :109-133
[4]  
ARMSTRONG RL, 1971, B VOLCANOL, V35, P27
[5]   OXYGEN ISOTOPES IN MANTLE RELATED AND GEOTHERMALLY ALTERED MAGMATITES OF THE TRANSHIMALAYAN (GANGDESE) RANGES [J].
BLATTNER, P ;
JIN, CW ;
YONG, X .
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY, 1989, 101 (04) :438-446
[6]   THE ORIGIN OF LAVAS AND IGNIMBRITES OF THE TAUPO VOLCANIC ZONE, NEW-ZEALAND, IN THE LIGHT OF OXYGEN ISOTOPE DATA [J].
BLATTNER, P ;
REID, F .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1982, 46 (08) :1417-1429
[7]  
Bowen N.L., 1928, EVOLUTION IGNEOUS RO
[8]  
BROWNE PRL, 1992, IN PRESS J VOLCAN GE
[9]   PETROGENESIS OF VOLUMINOUS MID-TERTIARY IGNIMBRITES OF THE SIERRA-MADRE OCCIDENTAL, CHIHUAHUA, MEXICO [J].
CAMERON, M ;
BAGBY, WC ;
CAMERON, KL .
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY, 1980, 74 (03) :271-284
[10]  
Clark R. H., 1960, NZ GEOLOGICAL SURVEY, V40, P107