ISOTOPIC DATING OF THE EMPLACEMENT OF THE ULTRAMAFIC MASSES IN THE SERRANIA-DE-RONDA, SOUTHERN SPAIN

被引:108
作者
PRIEM, HNA [1 ]
BOELRIJK, NAIM [1 ]
HEBEDA, EH [1 ]
OEN, IS [1 ]
VERDURMEN, EAT [1 ]
VERSCHURE, RH [1 ]
机构
[1] UNIV AMSTERDAM,INST GEOL,DEPT PETR & MINERAL,NL-1018 VZ AMSTERDAM,NETHERLANDS
关键词
D O I
10.1007/BF00371876
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
A Rb-Sr analysis of suites of samples from a small intrusion of cordierite-bearing alkali granite into the peridotite of the Sierra Bermeja (Serrania de Ronda) yields an age of 22± 4 Ma (λ = 1.42×10-11 a-1): Late Oligocene/Early Miocene. It is believed that the intrusion was derived from contact-anatectic melts produced along the hot ultramafic mass during and/or directly following its tangential, tectonic dislocation from a mantle diapir. Its age can thus be taken as dating the termination of the hot emplacement of the ultramafic masses. K-Ar dates of biotites and Rb-Sr dates of biotite/whole-rock pairs in contact-metamorphic wall rocks along the ultramafics mostly lie between 19.5 and 18.5 Ma. This probably indicates that about 19 Ma ago the contact-zones of the ultramafic masses had cooled down to the blocking temperature of biotite to Rb-Sr and K-Ar. © 1979 Springer-Verlag.
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页码:103 / 109
页数:7
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