Sm-Nd ages of mafic rocks from the Coastal Cordillera at 24°S, northern Chile

被引：12

作者：

Lucassen, F ^{[1
]}

Thirlwall, MF

机构：

[1] Tech Univ Berlin, Fachgebiet Petrol, D-10623 Berlin, Germany

[2] Univ London, Royal Holloway & Bedford New Coll, Dept Geol, Egham TW20 0EX, Surrey, England

来源：

GEOLOGISCHE RUNDSCHAU | 1998年 / 86卷 / 04期

关键词：

northern Chile; Jurassic magmatic arc; mafic granulite Sm-Nd isotope chemistry and ages;

D O I：

10.1007/s005310050175

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We investigated the Sm-Nd systematics of mafic granulite and undeformed layered gabbro, which form a midcrustal section of the Jurassic magmatic belt in the North Chilean Coast Range, south of Antofagasta. Mineral isochrons indicate ages between ca. 171 and 150 Ma for the granulite and an age of ca. 161 Ma for the gabbro. These ages are interpreted as closure time of the Sm-Nd system in the area. The age of metamorphism is Late-Jurassic. The minimum intrusion age of the protolith of the granulite is likely Early Jurassic (ca. 200 Ma), but an exact intrusion age could not be derived from the data. The intrusion age of the gabbro is ca. 185 Ma. Granulite generated from mantle-derived gabbroic magmas has epsilon(Nd200) between 6.28 and 7.05 and the gabbro that intruded the granulite has epsilon(Nd185) between 5.89 and 6.09.

引用

页码：767 / 774

页数：8

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