MANTLE-LITHOSPHERE BODIES IN THE ALBORAN CRUSTAL DOMAIN (RONDA PERIDOTITES, BETIC RIF OROGENIC BELT)

被引：42

作者：

TORNE, M ^{[1
]}

BANDA, E ^{[1
]}

GARCIADUENAS, V ^{[1
]}

BALANYA, JC ^{[1
]}

机构：

[1] UNIV GRANADA,CSIC,IAGM,DEPT GEODINAM,E-18071 GRANADA,SPAIN

来源：

EARTH AND PLANETARY SCIENCE LETTERS | 1992年 / 110卷 / 1-4期

关键词：

D O I：

10.1016/0012-821X(92)90046-X

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：

Geological and geophysical data are used to demonstrate the existence of intracrustal high-density/high P-wave velocity bodies in the western Betics. These bodies appear to correspond to buried peridotites similar to those that outcrop in the Ronda area. A gravity study shows how the gravity field is mainly the result of a combined effect of crustal thinning and the presence of ultramafic bodies. The size of the buried high-density body, as interpreted from gravity and seismic results, shows maximum dimensions of about 40 km in length (NNW-SSE), about 8 km in thickness, and a lateral extension (ENE-WSW) of about 70 km. The thinning of the crust from 32-35 km to 20-22 km takes place in a narrow area less than 35 km wide. Our results are compatible with an interpretation in terms of an unrooted peridotite slab. Dismembering of an initial slab of ultramafic rocks is a possible consequence of the extensional regime that originated the Alboran basin.

引用

页码：163 / 171

页数：9

共 45 条

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[2]

Balanya J.C., 1991, GEOGACETA, V9, P30

[3]

BALANYA JC, 1987, CR ACAD SCI II, V304, P929

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