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Zircon SHRIMP U-Pb dating for gabbro at Chaotiehe in the Haicheng area, eastern Liaoning

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chinese Science Bulletin 2010年第4期55卷 403-410页

作者： miao laicheng zhang fuqin liu dunyi shi yuruo xie hangqiang institute of geology and geophysics Chinese Academy of Sciences Beijing 100029 China beijing SHRIMP Centre Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China

Chaotiehe gabbroic intrusion in the eastern part of Liaoning Province was dated by the zircon SHRIMP U-Pb technique. The results gave an emplacement age of 126±4 Ma, indicating that the intrusion thus formed during the lithospheric thinning of the North china Craton (NCC) in the Early Cretaceous rather than in a rifting setting during the Paleoproterozoic as previously thought. The gabbroic intrusion contains abundant old zircons with Paleoproterozoic (2.10-2.46 Ga and ca. 1.87 Ga) and Neoproterozoic (747-969 Ma) ages. The Paleoproterozoic zircons were probably derived from NCC itself, whereas the Neoproterozoic ones were likely from materials of the Yangtze Craton that had previously been subducted beneath NCC. These geochronological dates are of important implications for understanding the Mesozoic crustal evolution of NCC.

关键词：锆石SHRIMP 辉长岩海城地区辽宁东部 Pb 古元古代同位素年代学侵位年龄

Zircon SHRIMP U-Pb ages of the “Xinghuadukou Group” in Hanjiayuanzi and Xinlin areas and the “Zhalantun Group” in Inner Mongolia,Da Hinggan Mountains

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chinese Science Bulletin 2007年第8期52卷 1112-1124页

作者： miao laicheng liu dunyi zhang fuqin FAN WeiMing shi yuruo xie hangqiang institute of geology and geophysics Chinese Academy of Sciences Beijing 100029 China beijing SHRIMP Center Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China

A report is presented of SHRIMP zircon U-Pb dating data of meta-igneous and meta-sedimentary rocks of the Xinghuadukou Group(Xinlin-Hanjiayuanzi area,Heilongjiang Province)and meta-volcanic rocks of the Zhalantun Group(Zhalantun district,Inner Mongolia).The SHRIMP analyses show that the meta-igneous rocks from the Xinghuadukou Group formed at 506±10―547±46 Ma,belonging to Early-Middle Precambrian,whereas the meta-sedimentary rocks yielded detrital zircons,with ages of 1.0―1.2,1.6―1.8 and 2.5―2.6 Ga,indicative of deposition age at least1.0 Ga. Meta-basic volcanic rocks from the Zhalantun Group have a formation age of 506±3 *** data suggest that both the Xinghuadukou and Zhalantun Groups formed during Cambrian and/or Neoproterozoic time,rather than Paleoproterozoic time as previously *** Precambrian inherited zircons in the meta-igneous rocks and numerous Precambrian detrital zircons in the meta-sedimentary rocks imply that these rocks were formed proximal to older *** is inferred that the Xinghuadukou and Zhalantun Groups represent Cambrian and/or Neoproterozoic vol- cano-sedimentary sequences formed in an active continental margin setting.

关键词：内蒙古大兴安岭新林地区韩家园子扎兰屯群兴华渡口群锆石 SHRIMP U-Pb 测年

Zircon SHRIMP U-Pb dating for gabbro at Chaotiehe in the Haicheng area, eastern Liaoning

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Science Bulletin 2010年第Z1期 403-410页

作者： miao laicheng1, zhang fuqin1, liu dunyi2, shi yuruo2 & xie hangqiang21 institute of geology and geophysics, chinese academy of sciences, beijing 100029, china 2 beijing SHRIMP Centre, institute of geology, chinese academy of Geological sciences, beijing 100037, china

关键词： Gabbro zircon SHRIMP age eastern Liaoning Province North china Craton

SHRIMP zircon U-Pb dating of the Gangou granitoids,Central Tianshan Mountains,Northwest china and tectonic significances

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chinese Science Bulletin 2007年第11期52卷 1507-1516页

作者： shi yuruo liu dunyi zhang Qi JIAN Ping zhang fuqin miao laicheng beijing SHRIMP Center Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China institute of geology and geophysics Chinese Academy of Sciences Beijing 100029 China

Two types of granitoids,highly deformed augen granitoids and undeformed fine-grained granitoids,are widely distributed in Gangou area,Central Tianshan Mountains,Northwest china. The augen granitoids are high-K calc-alkaline characterized by high K2O,Rb,Y and Th,and low Sr and Sr/Y. They also have high contents of large ion lithophile elements (LILE),such as Ba,Rb,K and Th,and relatively low con-tents of high field strength elements (HFSE),such as Zr,Y and Nb. The fine-grained granitoids are calc-alkaline characterized by high Sr,low Y and HREE,similar to adakitic rocks,and with Na2O/K2O2 (1.76―1.91),high ISr (0.70689―0.70981),and negative εNd(t ) (-2.4―-5.3). High-precision SHRIMP U-Pb zircon dating results indicate that the Gangou augen granitiods were formed at 428 ± 10 Ma,and the fine-grained granitoids were emplaced at 361―368 Ma. These geochemical and U-Pb zircon data have significant implications for the timing of closure of the Mishigou-Gangou Ocean and the evolution of the Central Tianshan orogenic belt.

关键词：测定年龄小虾地域天山

Zircon SHRIMP U-Pb ages of the“Xinghuadukou Group”in Hanjiayuanzi and Xinlin areas and the“Zhalantun Group”in Inner Mongolia,Da Hinggan Mountains

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Zircon SHRIMP U-Pb ages of the“Xinghuadukou Group”in Hanji...

中国科学院地质与地球物理研究所2007学术年会

作者： miao laicheng~(1+),liu dunyi~2,zhang fuqin~1,FAN WeiMing~1,shi yuruo~2 & xie hangqiang~1 1 institute of geology and geophysics,chinese academy of sciences,beijing 100029,china 2 beijing SHRIMP Center,institute of geology,chinese academy of Geological sciences,beijing 100037,china

A report is presented of SHRIMP zircon U-Pb dating data of meta-igneous and meta-sedimentary rocks of the Xinghuadukou Group(Xinlin-Hanjiayuanzi area,Heilongjiang Province) and meta-volcanic rocks of the Zhalantun Group(Zhalantun district,Inner Mongolia).The SHRIMP analyses show that the meta-igneous rocks from the Xinghuadukou Group formed at 506±10 -547±46 Ma,belonging to Early-Middle Precambrian,whereas the meta-sedimentary rocks yielded detrital zircons,with ages of 1.0 - 1.2,1.6 - 1.8 and 2.5 - 2.6 Ga,indicative of deposition age at least1.0 Ga. Meta-basic volcanic rocks from the Zhalantun Group have a formation age of 506±3 *** data suggest that both the Xinghuadukou and Zhalantun Groups formed during Cambrian and/or Neoproterozoic time,rather than Paleoproterozoic time as previously *** Precambrian inherited zircons in the meta-igneous rocks and numerous Precambrian detrital zircons in the meta-sedimentary rocks imply that these rocks were formed proximal to older *** is inferred that the Xinghuadukou and Zhalantun Groups represent Cambrian and/or Neoproterozoic volcano -sedimentary sequences formed in an active continental margin setting.

关键词： zircon SHRIMP metamorphic rock Xinghuadukou Group Zhalantun Group Da Hinggan Mountains

SHRIMP Zircon U-Pb Dating of Gabbro and Granite from the Huashan Ophiolite,Qinling Orogenic Belt,china: Neoproterozoic Suture on the Northern Margin of the Yangtze Craton

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Acta Geologica Sinica(English Edition) 2007年第2期81卷 239-243页

作者： shi yuruo liu dunyi zhang Zongqing miao laicheng zhang fuqin XUE Hongmei beijing SHRIMP Center Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 institute of geology and geophysics Chinese Academy of Sciences Beijing 100029 No. 4 Geological Team Xinjiang Bureau of Geology and Mineral Resources Altay Xinjiang 836500

The recently identified Huashan ophiolitic mélange was considered as the eastern part of the Mianlüe suture in the Qinling orogenic belt. SHRIMP zircon U-Pb geochronology on gabbro from the Huashan ophiolite and granite intruding basic volcanic rocks indicates crystallization ages of 947±14 Ma and 876±17 Ma respectively. These ages do not support a recently proposed Hercynian Huashan Ocean, but rather favor that a Neoproterozoic suture assemblage （ophiolite） is incorporated into the younger （Phanerozoic） Qinling orogenic belt.

关键词： SHRIMP Neoproterozoic Ophiolite Huashan Mianlüe Suture Qinling

SHRIMP U-Pb zircon geochronology and its implications on the Xilin Gol Complex,Inner Mongolia,china

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SHRIMP U-Pb zircon geochronology and its implications on the...

中国科学院地质与地球物理研究所2003学术年会

作者： shi Guanghai~1,liu dunyi~2,zhang fuqin~1, JIAN Ping~2,miao laicheng~1,shi yuruo~2 & TAO Hua~2 1.institute of geology and geophysics,chinese academy of sciences, beijing 100029,china 2.SHRIMP Lab,institute of geology,chinese academy of Geological sciences,beijing 100037,china

The Xilin Gol Complex,consisting of deformed and metamorphosed rocks,was exposed as a large geological unit within the Central Asian Orogenic Belt,but its forming and subsequent deformed and metamorphic time has been an issue of little *** analyses and SHRIMP dating on biotite-plagioclase gneiss,one of the major rocks within the Xilin Gol Complex,in southeast Xilinhot City,Inner Mongolia,china,where the Xilin Gol Complex was identified and named,yield its lower limit age of 437±3 Ma(2σ)by its magmatic zircon SHRIMP U-Pb dating,and an upper limit age of 316±3Ma(2σ),which was constrained by SHRIMP dating of magmatic zircons from adjacent undeformed garnet-bearing granite which intruded the Complex. The Complex was thus determined to be formed and subsequently deformed/metamorphosed from the late Ordovician -early Silurian to the ***,it is not the Precambrian terrane as previously considered by most *** or less,the major rock——biotiteplagioclase gneiss within the Complex is more likely to be Paleozoic fore-arc turbidite formation before metamorphism and intensive deformation,in which the detrital zircons gave sporadic Precambrian ages as old as up to 3.1 *** source of the turbidite formation is multiple,which may be derived either from the North china Craton,or from the South-Mongolia Micro-continent,or probably came from a potential and undiscovered in situ terranes aged 600—800 Ma or even up to ca 3.1 Ga near the Complex.

关键词： Xilin Gol Complex zircon SHRIMP geochronology Inner Mongolia

Zircon SHRIMP U-Pb dating of meta-diorite from the basement of the Songliao Basin and its geological significance

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chinese Science Bulletin 2006年第15期51卷 1877-1883页

作者： WANG Ying zhang fuqin zhang Dawei miao laicheng LI Tiesheng xie hangqiang MENG Qingren liu dunyi institute of geology and geophysics Chinese Academy of Sciences Beijing 100029 China Exploration Management Department of Jilin Oilfield Songyuan 138000 China Exploration and Development Research institute of Jilin Oilfield Songyuan 138000 China beijing SHRIMP Center Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China

The basement of the Songliao Basin mainly contains low-grade metamorphic rocks and granites. It has been long disputed whether the basin has Precambrian metamorphic basement. This is a report of zircon SHRIMP U-Pb dating results of a meta-diorite sample, which was taken from the Si-5 drilling hole in the southern portion of the Songliao Basin. The SHRIMP analyses indicate that the meta-diorite with a weighted mean 207Pb/206Pb age of 1839±7 Ma (2σ, n = 8) was emplaced during Paleo-Proterozoic time. Additionally, the meta-diorite has old Nd model ages (TDM1: 2999Ma; TDM2: 2849Ma). These data suggest that the south- ern part of the Songliao Basin do possess Precambrian base- ment.

关键词：锆石 SHRIMP定年闪长岩前寒武纪基岩松辽盆地

Zircon SHRIMP geochronology of the Xinkailing-Kele complex in the northwestern Lesser Xing'an Range,and its geological implications

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Zircon SHRIMP geochronology of the Xinkailing-Kele complex i...

中国科学院地质与地球物理研究所2004学术年会

作者： miao laicheng~1,FAN Weiming~1,zhang fuqing~1, liu dunyi~2,JIAN Ping~2,shi Guanghai~1,TAO Hua~2 & shi yuruo~2 1.institute of geology and geophysics,chinese academy of sciences, beijing 100029,china 2.SHRIMP Lab,institute of geology.chinese academy of Geological sciences,beijing 100037,china

Located in the eastern portion of the Xing’an-Mongolian Orogenic Belt(XMOB),the Xinkailing-Kele complex has previously been considered to be Precambrian metamorphic rocks,mainly according to its relatively high metamorphic *** filed observation,however,revealed that the complex is composed mainly of metamorphic rocks(Kele complex),tectono-schists("Xinkailing Group"), and granitoids(Xinkailing granitic complex).Dating on these rocks using advanced SHRIMP zircon U-Pb technique indicates that:(1) Biotite-plagioclase gneiss from the Kele complex has a protolith age of 337±7 Ma(2σ) and a metamorphic age of 216±3 Ma(2σ);(2) the tectono-schist of the"Xinkailing Group"gave a magmatic age of 292±6 Ma(2σ),indicative of felsic volcanic protolith of the schist formed in Late Paleozoic time;and(3) the Menluhedingzi and Lengchuan granites of the Xinkailing granitic complex were emplaced at 167±4(2σ) and 164±4 Ma(2σ),*** results suggest that the Xinkailing-Kele complex is not Precambrian metamorphic rocks and the so-called Precambrian"Nenjiang Block"does essentially not *** combination with regional geological data,we propose that the Kele metamorphic complex is likely related to a collisional tectonism that took place in Triassic time,as indicted by its metamorphic age of 216±3 *** Xinkailing granitic complex was emplaced along the collisional zone during Mid-Jurassic time, likely in a post-orogenic or anorogenic setting.

关键词： zircon SHRIMP geochronology Xinkailing-Kele complex Lesser Xing’an Range