全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
地质学报  2001 

大别山超高压岩石的流变学研究

, PP. 353-362

Keywords: 榴辉岩组构流变学超高压岩石石榴子石石榴橄榄岩古应力

Full-Text   Cite this paper   Add to My Lib

Abstract:

本文利用野外构造解析、透射电镜、岩组等手段,对大别山地区超高压岩石的变形表象及变形机制进行了详细的观察和研究,从而动态地建立了超高压岩石折返的PTtD轨迹。结果表明:超高压石榴橄榄岩经历了高温和低温两种变形,其中橄榄石中发育高温[001](100)和中低温[010](100)两种滑移系。超高压榴辉岩中绿辉石的位错构造发育,位错密度为4.98×10~7/cm~2。绿辉石亚颗粒的特征显示存在颗粒边界迁移和扩散蠕变。绿辉石的组构测定表明,绿辉石晶内塑性流动形成了[001]极密,该极密平行于线理,属L型收缩组构。组构对称型显示本区榴辉岩以共轴变形为主,由于应变分解,部分地区含非共轴成分。付林图解表明,绿辉石和石榴子石的变形均属于收缩型椭球,拉伸型应变,这与绿辉石组构测定结果一致。石榴子石位错密度为3.54×10~7/cm~2,部分地区的石榴子石发育动态重结晶及核幔构造等,形成榴辉岩相糜棱岩。另外根据不同超高压岩石中石英的位错密度或亚颗粒大小,计算了超高压岩石折返时各个阶段的应力大小。

References

[1]  陈晶,王清晨,翟明国,等.1995.榴辉岩中石榴子石的塑性变形特征.中国科学(B), 25(10):1115~1120.
[2]  金淑燕,焦述强. 1998. 超高压榴辉岩中绿辉石组构测定及其流变学意义.地球科学, 23(1):37~40.
[3]  刘若新,樊祺诚,李惠民,张旗,赵大升,马宝林.1995.大别山碧溪岭石榴橄榄岩-榴辉岩体的原岩性质及同位素年代学的启示.岩石学报,11(3):243~256.
[4]  徐树桐,苏文,刘贻灿.1991.大别山东段高压变质岩中的金刚石.科学通报,36(17):1318~1321.
[5]  钟增球,郭宝罗.1991.构造岩与显微构造.武汉:中国地质大学出版社.
[6]  Godard G, Van Roermund H L M. 1995. Deformation-induced clinopyroxene fabrics from eclogites. J. Struct. Geol., 17(10):1425~1443.
[7]  Helmstaedt H, Anderson O, Gavasci A. 1972. Petrofabric studies of eclogite, spinel-websterite, and spinel-lherzolite xenoliths from kinberlite-bearing breccia pipes in southeastern Utah and Northeastern Arizona. J. Geophys. Res., 7(23):4350~4365.
[8]  Ji S, Martignole J.1994. Ductility of garnet as an indicator of extremely high temperature deformation. J. Struct. Geol., 16(7):985~996.
[9]  Twiss R. 1977. Theory applicability of a recrystallized grain size paleopiezometry . Pure Appl. Geophys., 115:227~244.
[10]  Van Roermund H L M.1984. Omphacite microstructure from a Spanish eclogite. Textures Microstruct, 6:120~132.
[11]  从柏林,王清晨.1994.中国超高压变质岩研究评述.科学通报,39(24):2114~2118.
[12]  李金铭.1994. 新疆西准噶尔地区唐巴勒超基性岩地幔岩残体的超微构造与组构特征.西北地质科学, 15(1):1-10.
[13]  王清晨,从柏林.1996.大别山超高压变质岩的地球动力学意义.中国科学(D),26(3):271~276.
[14]  张泽明,游振东,韩郁菁,桑隆康.1995.大别~苏鲁榴辉岩带的岩石学、变质作用过程及成因研究.地质学报,69(4): 306~325.
[15]  Abalos B, Azcarraga J, Gil Ibarguchi J, Zalduegui J.1996. Flow stress, strain rate and effective viscosity evaluation in a high-pressure metamorphic nappe (Cabo Ortegal, Spain). J. Metamorphic Geol., 14:227~248.
[16]  Christensen N.1984.The magnitude, symmetry and origin of the upper mantle anisotropy.Geophys.J.R.Astr.Soc.,76:89~111.
[17]  Jiao Shuqiang,Jin zhenming,Jin Shuyan,Tan Zishan.1999.The fabric and deformation of omphacite in Dabie Ultra-high-pressure eclogites.Acta GeologicaSinica(English Edition),73(4):411~417.
[18]  Mercier J, Nicolas A. 1975. Textures and fabrics of upper mantle periodotites as illustrated by xenoliths from basalts. J. Petrl., 16:454~487.
[19]  Philippot P, Van Roermund H L M.1992. Deformation processes in eclogites rocks :evidence for the rheological delamination of the oceanic crust in deeper levels of subduction zones. J. Struct. Geol., 14(8~9):1059~1077.
[20]  Twiss R, Swllars C. 1978. Limits of applicability of the recrystallized grain size geopiezometer. Geophys. Res. Lett., 5:377~340.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133