Attitude characteristics of eclogite type and gneiss type foliations and miniature faults in 100-2 950 m core of the CCSD main hole
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P542 P588.3

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    Abstract:

    The dip angles of eclogite and retrograde metamorphic eclogite type foliations in 100~2 950 m core of the CCSD main hole are obviously steeper than the angles of gneiss type foliations, with the former angles being generally 55 or so and the latter around 28 . Foliations of gneiss type locally dissect foliations of eclogite type, and hence foliations of these two types might have been formed in different periods. The contact relation between the twotypes of rocks is that of ductile shear zone formed during SEE-NWW ductile shearing at the main exhumation stage of Su-Lu terrane. Foliation attitude of eclogite and retrograde metamorphic eclogite plays a certain role in controlling attitude of miniature faults in eclogite type rocks, whereas foliation attitude of gneiss type exerts a relatively weak role in controlling attitude of miniature faults in gneiss type rocks. Brittle deformation in the main hole mainly reflects deformational characteristics of the SEE-NWW extensional tectonic stress field since Cretaceous. The striation plunging of miniature normal faults in 100~1 620m core of the main hole is predominantly in SEE direction, and this evidently results from deformation of this stage.

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唐哲民,2005,CCSD主孔100-2950m榴辉岩类和片麻岩类叶理及微断层产状特征[J].岩石矿物学杂志,24(5):438~442. TANG Zhe-min,2005,Attitude characteristics of eclogite type and gneiss type foliations and miniature faults in 100-2 950 m core of the CCSD main hole[J]. Acta Petrologica et Mineralogica,24(5):438~442.

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  • Received:July 15,2005
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