晓天—磨子潭断裂的构造演化对大别高压—超高压岩石折返过程的指示

被引：11

作者：

向必伟

王勇生

朱光

石永红

机构：

[1] 合肥工业大学资源与环境工程学院

来源：

自然科学进展 | 2007年 / 12期

关键词：

晓天—磨子潭断裂带; 折返边界; 韧性剪切带; 脆性正断层;

D O I：

暂无

中图分类号：

P542.3 [];

学科分类号：

070904 ;

摘要：

位于大别造山带北部的晓天—磨子潭断裂带分隔了北大别高级变质带和北淮阳浅变质带.该断裂带由韧性剪切带和脆性正断层组成,两者具有基本一致的NW—SE向走向.脆性正断层叠加在韧性剪切带之上,控制了其北侧的早白垩世火山岩盆地的发育,为大别造山带早白垩世穹窿过程中的伸展断层.晓天—磨子潭韧性剪切带叠加在北大别灰色片麻岩之上.糜棱岩中的矿物变形温度估计(600—650℃)、基质多硅白云母探电子针分析及压力计算(约1.1GPa),指示韧性剪切带形成于高角闪岩相的下地壳深度,为造山带同碰撞折返边界.韧性剪切带糜棱面理上的矿物拉伸线理侧伏角自东向西逐渐由水平过渡到近倾向.露头构造、显微构造及石英C轴组构皆指示该韧性剪切带具有上盘向北西的运动方向.韧性剪切带几何学与运动学特征指示,大别造山带高压—超高压岩片的折返是向南东的斜向挤出,并兼有折返岩片以东端为枢纽的逆时针旋转.

引用

页码：1639 / 1650

页数：12

共 31 条

[1] Survival of eclogite xenolith in a Cretaceous granite intruding the Central Dabieshan migmatite gneiss dome (Eastern China) and its tectonic implications [J].

Lin, Wei ;

Enami, Masaki ;

Faure, Michel ;

Schaerer, Urs ;

Arnaud, Nicolas .

INTERNATIONAL JOURNAL OF EARTH SCIENCES, 2007, 96 (04) :707-724

[2] Low-grade metamorphic rocks in the Dabie-Sulu orogenic belt: A passive-margin accretionary wedge deformed during continent subduction [J].

Zheng, YF ;

Zhou, JB ;

Wu, YB ;

Xie, Z .

INTERNATIONAL GEOLOGY REVIEW, 2005, 47 (08) :851-871

[3]

Continental subduction and exhumation of UHP rocks. Structural and geochronological insights from the Dabieshan (East China).[J]..LITHOS.2003, 3

[4]

Physical properties of ultrahigh-pressure metamorphic rocks from the Sulu terrain; eastern central China: implications for the seismic structure at the Donghai (CCSD) drilling site.[J].Hartmut Kern;Zhenmin Jin;Shan Gao;Till Popp;Zhiqin Xu.Tectonophysics.2002, 3

[5]

Constraints on timing of peak and retrograde metamorphism in the Dabie Shan Ultrahigh-Pressure Metamorphic Belt; east-central China; using U–Th–Pb dating of zircon and monazite.[J].John C Ayers;Stacie Dunkle;Shan Gao;Calvin F Miller.Chemical Geology.2002, 3

[6]

The eastern Tonale fault zone: a ‘natural laboratory’ for crystal plastic deformation of quartz over a temperature range from 250 to 700<ce:hsp sp="0.25"/>°C.[J].Michael Stipp;Holger Stünitz;Renée Heilbronner;Stefan M. Schmid.Journal of Structural Geology.2002, 12

[7]

Fold-controlled quartz textures in the Pennine Mischabel backfold near Zermatt; Switzerland.[J].Hermann Lebit;Eva M Klaper;Catalina M Lüneburg.Tectonophysics.2002, 1

[8] Multichronometric evidence for an in situ origin of the ultrahigh-pressure metamorphic terrane of Dabieshan, China [J].

Chavagnac, V ;

Jahn, BM ;

Villa, IM ;

Whitehouse, MJ ;

Liu, DY .

JOURNAL OF GEOLOGY, 2001, 109 (05) :633-646

[9] Quartz crystallographic and morphologic fabrics during folding/transposition in mylonites [J].

Hongn, FD ;

Hippertt, JF .

JOURNAL OF STRUCTURAL GEOLOGY, 2001, 23 (01) :81-92

[10] Ductile deformation of K-feldspar in dry eclogite facies shear zones in the Bergen Arcs, Norway [J].

Altenberger, U ;

Wilhelm, S .

TECTONOPHYSICS, 2000, 320 (02) :107-121

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