冀北赤城红旗营子杂岩中退变榴辉岩的韧性变形及构造意义
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摘要
地球深部岩石流变学研究是地球科学的热点和难点,对高温-高压岩石俯冲-折返带韧性变形的观测尚不充分,特别是榴辉岩的变形方式、机制及构造意义尚不明确.本文选取河北赤城红旗营子杂岩强变形退变质榴辉岩为研究对象,基于传统观测与扫描电子显微镜(Scanning Electron Microscope,SEM)及电子背散射衍射(Electron Backscatter Diffraction,EBSD)定量观测,对其显微构造及组构特征进行分析.研究发现:折返过程中退变质新生石榴子石发生明显塑性变形,但没有明显的晶格优选(Lattice Preferred Orientation,LPO),其成因是位错蠕变时多滑移系的同时启动;斜长石表现出特殊的组构特征,(001)面在Z方向上存在极密,该特征可能与此前没有报道过的[100](001)滑移系启动有关;此外,石榴子石退变质形成的斜长石的取向差角分布图呈"双峰式",即在低取向差角(小于40°)和高取向差角(大于140°)均存在峰值,且从残斑周边向外,最大峰值由低取向差角变为高取向差角,高角度晶界增多,其变形过程受母晶晶体方位和颗粒边界滑动控制.角闪石发生位错蠕变和溶解-沉淀作用,在角闪石条带和退变质石榴子石眼球中表现出一致的LPO,解释为[001](010)滑移系启动所致,取向差角分布图存在低取向差角峰值.分析表明,该退变质榴辉岩的韧性变形主要发生在折返过程,伴随退变质作用进行.
引文
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孔旭.2012.冀北赤城红旗营子杂岩年代学研究.硕士学位论文.成都:成都理工大学.1-55
孔旭,倪志耀,翟明国,石玉若,严刚,张静.2011.冀北赤城榴辉岩的时间序列:来自锆石SHRIMP U-Pb年龄的证据.矿物岩石,(2):15-22
刘俊来,曹淑云,邹运鑫,宋志杰.2008.岩石电子背散射衍射(EBSD)组构分析及应用.地质通报,27:1638-1645
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童英,倪志耀,王仁民.2003.冀北发现具鬣刺结构的超基性岩.矿物岩石,23:6-10
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徐海军,金淑燕,郑伯让.2007.岩石组构学研究的最新技术——电子背散射衍射(EBSD).现代地质,21:213-225
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Imon R,Okudaira T,Fujimoto A.2002.Dissolution and precipitation processes in deformed amphibolites:An example from the ductile shear zone of the Ryoke metamorphic belt,SW Japan.J Metamorphic Geol,20:297-308
Imon R,Okudaira T,Kanagawa K.2004.Development of shape-and lattice-preferred orientations of amphibole grains during initial cataclastic deformation and subsequent deformation by dissolution-precipitation creep in amphibolites from the Ryoke metamorphic belt,SW Japan.J Struct Geol,26:793-805
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Jiang Z T,Prior D J,Wheeler J.2000.Albite crystallographic preferred orientation and grain misorientation distribution in a low-grade mylonite:Implications for granular flow.J Struct Geol,22:1663-1674
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Llana-Funez S,Marcos A,Kunze K.2005.Strain geometry in Concepenido eclogites during widespread HP deformation(Cabo Ortegal Complex,NW Spain).Tectonophysics,401:198-216
Mainprice D,Bascou J,Cordier P,Tommasi A.2004.Crystal preferred orientations of garnet:Comparison between numerical simulations and electron back-scattered diffraction(EBSD)measurements in naturally deformed eclogites.J Struct Geol,26:2089-2102
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Tatham D J,Lloyd G E,Butler R W H,Casey M.2008.Amphibole and lower crustal seismic properties.Earth Planet Sci Lett,267:118-128
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河北省地质矿产局.1989.河北省、北京市、天津市区域地质志.北京:地质出版社.741
孔旭.2012.冀北赤城红旗营子杂岩年代学研究.硕士学位论文.成都:成都理工大学.1-55
孔旭,倪志耀,翟明国,石玉若,严刚,张静.2011.冀北赤城榴辉岩的时间序列:来自锆石SHRIMP U-Pb年龄的证据.矿物岩石,(2):15-22
刘俊来,曹淑云,邹运鑫,宋志杰.2008.岩石电子背散射衍射(EBSD)组构分析及应用.地质通报,27:1638-1645
刘树文,吕勇军,凤永刚,柳小明,闫全人,张臣,田伟.2007.冀北红旗营子杂岩的锆石、独居石年代学及地质意义.地质通报,26:1086-1100
卢俊生,倪志耀,翟明国,童英,王仁民,严刚,刘胤.2009.冀北赤城红旗营子群中变质橄榄岩的岩石学与地球化学特征.矿物岩石,29:91-99
倪志耀,翟明国,王仁民,童英,舒桂明,韩秀玲.2004.华北古陆块北缘中段发现晚古生代退变榴辉岩.科学通报,49:585-591
童英,倪志耀,王仁民.2003.冀北发现具鬣刺结构的超基性岩.矿物岩石,23:6-10
王惠初,初航,相振群,陆松年,赵凤清,任云伟.2012.华北克拉通北缘崇礼——赤城地区的红旗营子(岩)群:一套晚古生代的变质杂岩.地学前缘,19:100-113
徐海军,金淑燕,郑伯让.2007.岩石组构学研究的最新技术——电子背散射衍射(EBSD).现代地质,21:213-225
徐海军,张素新,金振民.2008.退变质榴辉岩中角闪石的组构特征.电子显微学报,27:506-511
许志琴.2007.深俯冲和折返动力学:来自中国大陆科学钻探主孔及苏鲁超高压变质带的制约.岩石学报,23:3041-3053
许志琴,梁凤华,杨经绥,张泽明,唐哲民.2009a.再论“大陆深俯冲和折返动力学”:来自中国大陆科学群钻及苏鲁超高变质带的制约.岩石学报,25:1561-1574
许志琴,王勤,陈方远,梁凤华,唐哲民.2006.榴辉岩组构运动学与大陆深俯冲——中国大陆科学钻探主孔榴辉岩的EBSD研究.岩石学报,22:1799-1809
许志琴,王勤,梁凤华,陈方远,许翠萍.2009b.电子背散射衍射(EBSD)技术在大陆动力学研究中的应用.岩石学报,25:1721-1136
杨平.2007.电子背散射衍射技术及其应用.北京:冶金工业出版社.229
张晓东.2008.丰宁-赤城韧性剪切带变形特征.硕士学位论文.北京:中国地质大学.1-71
周兵,张成江,倪志耀.2008.冀北赤城退变榴辉岩的岩石地球化学及原岩恢复.四川地质学报,(4):339-341
Agard P,Yamato P,Jolivet L,Burov E.2009.Exhumation of oceanic blueschists and eclogites in subduction zones:Timing and mechanisms.Earth-Sci Rev,92:53-79
Angel R J,Carpenter M A,Finger L W.1990.Structural variation associated with compositional variation and order-disorder behavior in anorthite-rich feldspars.Am Mineral,75:150-162
Bunge H.1982.Texture Analysis in Materials Science:Mathematical Models.London:Butterworths.593
Cao S Y,Liu J L,Leiss B.2010.Orientation-related deformation mechanisms of naturally deformed amphibole in amphibolite mylonites from the Diancang Shan,SW Yunnan,China.J Struct Geol,32:606-622
Diaz Aspiroz M,Lloyd G E,Fernandez C.2007.Development of lattice preferred orientation in clinoamphiboles deformed under low-pressure metamorphic conditions.A SEM/EBSD study of metabasites from the Aracena metamorphic belt(SW Spain).J Struct Geol,29:629-645
Doglioni C,Carminati E,Cuffaro M,Scrocca D.2007.Subduction kinematics and dynamic constraints.Earth-Sci Rev,83:125-175
Imon R,Okudaira T,Fujimoto A.2002.Dissolution and precipitation processes in deformed amphibolites:An example from the ductile shear zone of the Ryoke metamorphic belt,SW Japan.J Metamorphic Geol,20:297-308
Imon R,Okudaira T,Kanagawa K.2004.Development of shape-and lattice-preferred orientations of amphibole grains during initial cataclastic deformation and subsequent deformation by dissolution-precipitation creep in amphibolites from the Ryoke metamorphic belt,SW Japan.J Struct Geol,26:793-805
Ji S C,Saruwatari K,Mainprice D,Wirth R,Xu Z Q,Xia B.2003.Microstructures,petrofabrics and seismic properties of ultra high-pressure eclogites from Sulu region,China:Implications for rheology of subducted continental crust and origin of mantle reflections.Tectonophysics,370:49-76
Jiang Z T,Prior D J,Wheeler J.2000.Albite crystallographic preferred orientation and grain misorientation distribution in a low-grade mylonite:Implications for granular flow.J Struct Geol,22:1663-1674
Liu J L,Tang Y,Xia H R,Guo Q,Dung T M,Cao S Y,Wu H J,Wu W B,Zhang Z C,Zhao Z D.2010.High temperature strain structures and quartz C-axis fabrics from mylonitic rocks in the Ailaoshan-Red River Shear Zone,Yunnan,and their tectonic implication.Acta Geol Sin,6:1377-1390
Llana-Funez S,Marcos A,Kunze K.2005.Strain geometry in Concepenido eclogites during widespread HP deformation(Cabo Ortegal Complex,NW Spain).Tectonophysics,401:198-216
Mainprice D,Bascou J,Cordier P,Tommasi A.2004.Crystal preferred orientations of garnet:Comparison between numerical simulations and electron back-scattered diffraction(EBSD)measurements in naturally deformed eclogites.J Struct Geol,26:2089-2102
Mauler A,Godard G,Kunze K.2001.Crystallographic fabrics of omphacite,rutile and quartz in Vende'e eclogites(Armorican Massif,France).Consequences for deformation mechanisms and regimes.Tectonophysics,342:81-112
Meng Q P,He Y K,Zhang W,Zheng R G,Xu C,Zhang Z Y,Wu T R.2014a.Time constraints on the inversion of the tectonic regime in the northern margin of the North China Craton:Evidence from the Daqingshan granites.J Asian Earth Sci,79:246-259
Meng Q R,Wei H H,Wu G L,Duan L.2014b.Early Mesozoic tectonic settings of the northern North China Craton.Tectonophysics,611:155-166
Ni Z Y,Zhai M G,Wang R M,Tong Y.2006.Late Paleozoic retrograded eclogites from within the northern margin of the North China Craton:Evidence for subduction of the Paleo-Asian ocean.Gondwana Res,9:209-224
Passchier C W,Trouw R A J.2000.Microtectonics.2nd ed.Berlin:Springer.366
Pollok K,Lloyd G E,Austrheim H,Putnis A.2008.Complex replacement patterns in garnets from Bergen Arcs eclogites:A combined EBSD and analytical TEM study.Chem ErdeGeochem,68:177-191
Prior D J,Spiess R,Timms N E,Trimby P,Wheeler J,Zetterstrom L,Alan B,Brenker F,Cheadle M C,Day A,Lopez G,Peruzzi L,Potts G,Reddy S.1999.The application of electron backscatter diffraction and orientation contrast imaging in the SEM to textural problems in rocks.Am Mineral,84:1741-1759
Qi G W,Zhang J J,Wang M.2015.Mesozoic tectonic setting of rift basins in eastern North China and implications for destruction of the North China Craton.J Asian Earth Sci,111:414-427
Satsukawa T,Ildefonse B,Mainprice D,Morales L F G,Michibayashi K,Barou F.2013.A database of plagioclase crystal preferred orientations(CPO)and microstructures-implications for CPO origin,strength,symmetry and seismic anisotropy in gabbroic rocks.Solid Earth,4:511-542
Stern R J.2002.Subduction zones.Rev Geophys,40:1-3
Storey C D.2005.Plastic Deformation and recrystallization of garnet:A mechanism to facilitate diffusion creep.J Petrol,46:2593-2613
St(u|¨)nitz H.1998.Syndeformational recrystallization-dynamic or compositionally induced?Contrib Mineral Petrol,131:219-236
St(u|¨)nitz H,Fitz Gerald J D,Tullis J.2003.Dislocation generation,slip systems,and dynamic recrystallization in experimentally deformed plagioclase single crystals.Tectonophysics,372:215-233
Svahnberg H,Piazolo S.2010.The initiation of strain localisation in plagioclase-rich rocks:Insights from detailed microstructural analyses.J Struct Geol,32:1404-1416
Tatham D J,Lloyd G E,Butler R W H,Casey M.2008.Amphibole and lower crustal seismic properties.Earth Planet Sci Lett,267:118-128
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