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河南洛宁太华变质杂岩区早元古代变质作用P-T-t轨迹及其大地构造意义
引用本文:蒋宗胜,王国栋,肖玲玲,第五春荣,卢俊生,吴春明.河南洛宁太华变质杂岩区早元古代变质作用P-T-t轨迹及其大地构造意义[J].岩石学报,2011,27(12):3701-3717.
作者姓名:蒋宗胜  王国栋  肖玲玲  第五春荣  卢俊生  吴春明
作者单位:1. 大陆动力学国家重点实验室,西北大学地质学系,西安710069;中国科学院研究生院地球科学学院,北京100049
2. 中国科学院研究生院地球科学学院,北京,100049
3. 中国地质科学院地质研究所,北京,100037
4. 大陆动力学国家重点实验室,西北大学地质学系,西安710069
基金项目:本文受国家自然科学基金项目(40872125)和西北大学大陆动力学国家重点实验室联合资助.
摘    要:太华变质杂岩广泛出露于华北克拉通南缘,总体呈SW-NE向展布.在河南洛宁地区,太华变质杂岩以TTG片麻岩、斜长角闪片麻岩和变泥质片麻岩为主.斜长角闪片麻岩中可识别出三个阶段的变质矿物组合:进变质阶段矿物组合(M1)为石榴子石变斑晶内部的包裹体矿物组合( Amp1+ Pl1+Qtz),变质高峰期矿物组合(M2)为石榴子石变斑晶边部和基质矿物组合( Grt2+ Amp2+ Pl2+ Qtz),退变质阶段矿物组合(M3)为“白眼圈”状后成合晶组合(Amp3+ Pl3+ Qtz).运用矿物温度计与压力计估算三个阶段的P-T条件分别为:进变质阶段约600 ~ 680℃/7.0~ 7.6kbar,变质高峰期为680 ~ 790℃/9.5 ~10.7kbar,退变质阶段为580~720℃/6.5 ~7.6kbar.变泥质片麻岩中保留了进变质阶段(M1)包裹体矿物组合(Bt1+Pl1+Qtz)和峰期变质阶段(M2)矿物组合(Grt2 +Bt2+Pl2 +Qtz)两个阶段.其中未发现后期退变质反应结构,石榴子石中也未发现成分环带.P-T条件估算结果分别为:M1阶段620 ~ 710℃/4.9 ~5.6kbar,M2阶段710~760℃/7.3~8.3kbar.洛宁地区太华变质杂岩记录了顺时针的近等温降压型的P-T轨迹,可能经历了与华北中部造山带其它杂岩类似的变质演化过程,推测其形成于华北克拉通东部陆块和西部陆块沿中部造山带的拼合过程中.SIMS与ICP-MS锆石U-Pb定年表明,斜长角闪片麻岩记录了1938~1967Ma的变质事件,比华北中部造山带其它变质杂岩区所广泛记录的~1850Ma变质事件早了约100Ma,暗示中部造山带的拼合可能是一个长期的、复杂的过程.

关 键 词:温压计  P-T轨迹  变质作用时代  太华变质杂岩  中部造山带  华北克拉通
收稿时间:2011/4/30 0:00:00
修稿时间:2011/10/20 0:00:00

Paleoproterozoic metamorphic P-T-t path and tectonic significance of the Luoning metamorphic complex at the southern terminal of the Trans-North China Orogen, Henan Province
JIANG ZongSheng,WANG GuoDong,XIAO LingLing,DIWU ChunRong,LU JunSheng and WU ChunMing.Paleoproterozoic metamorphic P-T-t path and tectonic significance of the Luoning metamorphic complex at the southern terminal of the Trans-North China Orogen, Henan Province[J].Acta Petrologica Sinica,2011,27(12):3701-3717.
Authors:JIANG ZongSheng  WANG GuoDong  XIAO LingLing  DIWU ChunRong  LU JunSheng and WU ChunMing
Institution:State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China;College of Earth Science, The Graduate School, Chinese Academy of Sciences, Beijing 100049, China;College of Earth Science, The Graduate School, Chinese Academy of Sciences, Beijing 100049, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China;College of Earth Science, The Graduate School, Chinese Academy of Sciences, Beijing 100049, China;State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China;College of Earth Science, The Graduate School, Chinese Academy of Sciences, Beijing 100049, China
Abstract:The NW-SE-striking Taihua metamorphic complex crop out discretely along the southern margin of the Trans-North China Orogen (TNCO), among which the Luoning metamorphic terrane is mainly composed of TTG-like gneisses, amphibolitic gneisses and metapelitic gneisses. Garnets in amphibolitic gneisses are commonly embayed and surrounded by amphibole+plagioclase+quartz symplectites. Three generations of mineral assemblages have been recognized in the amphibolites: the prograde assemblage (M1) is represented by pl...
Keywords:Thermobarometer  Metamorphic P-T path  Metamorphic geochronology  Taihua Complex  Trans-North China Orogen
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