COMBINED SM-ND AND RB-SR ISOTOPE SYSTEMATICS IN THE DONEGAL GRANITOIDS AND THEIR PETROGENETIC IMPLICATIONS

被引：20

作者：

DEMPSEY, CS ^{[1
]}

HALLIDAY, AN ^{[1
]}

MEIGHAN, IG ^{[1
]}

机构：

[1] SCOTTISH UNIV RES & REACTOR CTR,ISOTOPE GEOL UNIT,E KILBRIDE G75 0QU,LANARK,SCOTLAND

来源：

GEOLOGICAL MAGAZINE | 1990年 / 127卷 / 01期

关键词：

D O I：

10.1017/S0016756800014175

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The metaluminous to peraluminous granitoids of the Donegal batholith, northwest Ireland, were emplaced at c. 400 Ma into greenschist-amphibolite facies metasediments of the Dalradian Supergroup. Sm-Nd and Rb-Sr isotopic data are provided for eleven granitoid samples from six of the plutons and one specimen from the northeast granodiorite pluton of the Newry complex, Co. Down; the Donegal results reveal essentially similar initial Sr isotope ratios (0.7051–0.7068) but highly variable initial eNd values, −1.2 to −8.3 (and −0.5 for Newry). Certain granitoids have distinctive Nd isotopic compositions characteristic of the involvement of old, LREE-enriched continental crust in some cases or young crust and/or mantle-derived magmas in others. The Nd and Sr isotopic variations can be explained by a variety of mixing hypotheses. © 1990, Cambridge University Press. All rights reserved.

引用

页码：75 / 80

页数：6

共 25 条

[1] LISPB .4. CRUSTAL STRUCTURE OF NORTHERN-BRITAIN [J].

BAMFORD, D ;

NUNN, K ;

PRODEHL, C ;

JACOB, B .

GEOPHYSICAL JOURNAL OF THE ROYAL ASTRONOMICAL SOCIETY, 1978, 54 (01) :43-&

[2]

Bamford D., 1977, J GEOL SOC LONDON, V133, P481

[3]

BLAXLAND A.B., 1979, SCOTT J GEOL, V15, P139, DOI [10.1144/sjg15020139, DOI 10.1144/SJG15020139]

[4] A NEODYMIUM AND STRONTIUM ISOTOPIC STUDY OF THE MESOZOIC CALC-ALKALINE GRANITIC BATHOLITHS OF THE SIERRA-NEVADA AND PENINSULAR RANGES, CALIFORNIA [J].

DEPAOLO, DJ .

JOURNAL OF GEOPHYSICAL RESEARCH, 1981, 86 (NB11) :470-488

[5] CALEDONIAN MAGMA GENESIS AND CRUSTAL RECYCLING [J].

FROST, CD ;

ONIONS, RK .

JOURNAL OF PETROLOGY, 1985, 26 (02) :515-544

[6] A ND, SR AND O ISOTOPIC INVESTIGATION INTO THE CAUSES OF CHEMICAL AND ISOTOPIC ZONATION IN THE BISHOP-TUFF, CALIFORNIA [J].

HALLIDAY, AN ;

FALLICK, AE ;

HUTCHINSON, J ;

HILDRETH, W .

EARTH AND PLANETARY SCIENCE LETTERS, 1984, 68 (03) :379-391

[7] ISOTOPIC AND CHEMICAL CONSTRAINTS ON THE BUILDING OF THE DEEP SCOTTISH LITHOSPHERE [J].

HALLIDAY, AN ;

STEPHENS, WE ;

HUNTER, RH ;

MENZIES, MA ;

DICKIN, AP ;

HAMILTON, PJ .

SCOTTISH JOURNAL OF GEOLOGY, 1985, 21 :465-491

[8] A REVISED AGE FOR THE DONEGAL GRANITES [J].

HALLIDAY, AN ;

AFTALION, M ;

LEAKE, BE .

NATURE, 1980, 284 (5756) :542-543

[9] THE ISOTOPIC AND CHEMICAL EVOLUTION OF MOUNT ST-HELENS [J].

HALLIDAY, AN ;

FALLICK, AE ;

DICKIN, AP ;

MACKENZIE, AB ;

STEPHENS, WE ;

HILDRETH, W .

EARTH AND PLANETARY SCIENCE LETTERS, 1983, 63 (02) :241-256

[10] COUPLED SM-ND AND U-PB SYSTEMATICS IN LATE CALEDONIAN GRANITES AND THE BASEMENT UNDER NORTHERN BRITAIN [J].

HALLIDAY, AN .

NATURE, 1984, 307 (5948) :229-233

← 1 2 3 →