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411.
对采自重庆金佛山梁天湾洞穴的一根长290mm的14号石笋进行了高精度的定年和稳定同位素分析.在此基础上,对石笋的沉积结构、层面构造、沉积间断等特征标志进行了研究,阐述了重庆梁天湾涧石笋的沉积特征以及洞穴占滴水的动态变化.TIMS-U系测年结果表明:该石笋形成于31.9KaB.P.,结束于15.21Ka B.P.,属于末次冰期晚期的产物.石笋的沉积基本连续。没有明显的沉积间断,共分为4个旋回,沉积速率从老到新分别为65.22mm/Ka,8.37mm/Ka,97.09mm/Ka,24.39mm/Ka. 相似文献
412.
Quanren Yan Zongqi Wang Shuwen Liu Qiugen Li Hongyuan Zhang Tao Wang Dunyi Liu Yuruo Shi Ping Jian Jianguo Wang Dehui Zhang Jian Zhao 《科学通报(英文版)》2005,50(3):256-264
SHRIMP U-Pb zircon analyses for a gabbro sample from the Garzê ophiolite block yielded a mean206Pb/238U age of 292 ±4 Ma, which indicated that the spreading time of the Garzê-Litang Tethys was most likely at the earliest Permian.
Combined with previous studies, we suggest that the opening of the Tethys in southwest China was derived from breakup of the
East Gondwanaland in the late Paleozoic. 相似文献
413.
SHRIMP U-Pb zircon geochronology of granulites at Rimana (Southern Tibet) in the central segment of Himalayan Orogen 总被引:2,自引:0,他引:2
LI Dewei LIAO Qunan YUAN Yanming WAN Yusheng LIU Demin ZHANG Xionghua YI Shunhua CAO Shuzhao & XIE Defan . Faculty of Earth Sciences China University of Geosciences Wuhan China . Institute of Geology Chinese Academy of Geosciences Beijing China Correspondence should be addressed to Li Dewei 《科学通报(英文版)》2003,48(23):2647-2650
TheCenozoicHimalayanorogenisimportantinun-derstandingcontinentaldynamicprocesses.Lowercrustal,high-grademetamorphicrockshaverecentlybeendiscov-eredinNamcheBarwaandParmir,i.e.therespectivere-gionsofeasternandwesternsyntaxisoftheorogen[1—4].Eclogitesthatunderwentgranulite-faciesmetamorphismhaverecentlybeenreportedintheCadaareatotheeastofMountEverestinthecentralsegmentoftheHimalayanorogen[5].WiththehelpofthegeologicalsurveyofDing-gyeCountyandChentangSheets(scale1︰250000),high-pressuremafic… 相似文献
414.
释光测年的研究简史及研究现状 总被引:11,自引:0,他引:11
针对释光现象的研究,及其在地质和考古年代测定中的应用,将释光测年的研究历史划分为3个阶段:20世纪50年代末以前,释光测年研究的萌芽阶段;60年代至80年代中期,热释光测年的研究及发展阶段;80年代中期至今,光释光测年的研究及发展阶段。最后,对释光测年的研究现状进行了简单的总结,认为对释光现象产生机制的许多细节还有待深入研究,对于非线性释光生长曲线的校正及提高测年的精度,仍是测量等效剂量(De)时研究的主要问题。 相似文献
415.
中国内蒙古锡林郭勒杂岩SHRIMP锆石U-Pb年代学及意义 总被引:35,自引:3,他引:35
锡林郭勒杂岩是中亚造山带内出露面积较大的强变形变质地质体, 其形成时代与性质存在较大认识上的分歧. 对锡林浩特东南锡林郭勒杂岩定名处黑云斜长片麻岩进行了岩相分析和SHRIMP锆石U-Pb年代学研究, 其形成年龄下限由杂岩中碎屑岩浆锆石SHRIMP U-Pb年龄限定为437±3 Ma, 其形成上限由侵入于杂岩内的石榴石花岗岩SHRIMP锆石U-Pb年龄限定为316±3 Ma. 这表明该杂岩的沉积成岩年龄晚于晚奥陶纪~早志留纪, 因此不是前寒武纪古老地质体. 结合实际野外观察和室内岩石特征分析, 该杂岩可能是一套经历强变形与变质作用的古生代弧前浊积岩建造. 杂岩中碎屑锆石还给出分散的前寒武纪年龄, 最老可达3.1 Ga, 这些锆石既可能来源于华北基底, 也可能来源于南蒙微大陆, 抑或暗示该区存在600~800 Ma或更古老(3.1 Ga)块体, 表明其碎屑来源的复杂性. 相似文献
416.
Mineralizing age of the Rushan lode gold deposit in the Jiaodong Peninsula:SHRIMP U-Pb dating on hydrothermal zircon 总被引:29,自引:0,他引:29
HU Fangfang FAN Hongrui YANG Jinhui WAN Yusheng LIU Dunyi ZHAI Mingguo & JIN Chengwei .Key Laboratory of Mineral Resources Institute of Geology Geo- physics Chinese Academy of Sciences Beijing China .Beijing SHRIMP Centre Institute of Geology Chinese Academy of Geological Sciences Beijing China Correspondence should be addressed to Fan Hongrui 《科学通报(英文版)》2004,49(15):1629-1636
Knowledge of the mineralizing timing is fundamen-tal to understand the genesis of mineral deposits, and ex-act time spectrum of mineralization is essential to com-prehending the relationship among the genesis of en-dogenic hydrothermal deposits, regional tectonic-magma-tism event and the geodynamics of mineral deposits. The Jiaodong or eastern Shandong gold province islocated in the southeastern margin of the North Chinacraton, and belongs to the Mesozoic circum-Pacific oro-genic gold system… 相似文献
417.
YAN Quanren A. D. Hanson WANG Zongqi P. A. Druschke YAN Zhen WANG Tao & LU Haifeng . Institute of Geology Chinese Academy of Geological Sciences Bei-jing China . Department of Geosciences University of Nevada Las Vegas Las Vegas NV USA . Institute of Geology Geophysics Chinese Academy of Sciences Beijing China 《科学通报(英文版)》2004,49(16):1722-1729
TheGuanjiagouFormationisafault-boundterranelocatedintheSouthQinlingMountains,centralChina.Theageandtectonicsettingoftheconglomerateinthisformation(Guanjiagouconglomerate,GC)havebeencontroversialsincethe1940s,withnumerousconflictinginterpretationsandcorrelationsproposedbydifferentworkers.Forexample,itwasinitiallydescribedbyYeetal.(1944)[1],whointerpretedtheGCasSinian(LatestNeo-proterozoic)tillites.However,Huang[2]regardedtheGC,plustheBikouSystem(composedoftheBikouvolcanicandtheHengdant… 相似文献
418.
LIUQisheng WUZhenhan HUDaogong YEPeisheng JIANGWan WANGYanbin ZHANGHancheng 《科学通报(英文版)》2004,49(1):76-82
The Nyainqentanglha granite, a batholith with an area of 1500 km^2 in the central Lhasa block, comprises mainly medium-fine-grained biotite monzonitic granite and medium-coarse-grained biotite monzonitic granite. Their contact relationship suggests that the medlum-fine-grained biotite monzonitic granite was crystallized earlier than the medium-coarse-grained monzonitic granite. A SHRIMP U-Pb dating on zircons from representative samples of the batholith shows that the crystallization age of the medium-fine-grained biotite monzonitic granite is 18.3 Ma and that of the medium-coarse-grained monzonitic granite is 11.01 Ma. The emplacement and crystallization of the Nyainqentanglha granite, the youngest granite batholith ever known inside the Lhasa block, have a close relationship with the collisional orogeny, crustal thickening, plateau uplifting,E-W crustal extension and have a dynamic genetic relationship with the crustal partial melting. 相似文献
419.
Mixing events between the crust- and mantle-derived magmas in Eastern Kunlun: Evidence from zircon SHRIMP Ⅱ chronology 总被引:13,自引:0,他引:13
LIU Chengdong MO Xuanxue LUO Zhaohua YU Xuehui CHEN Hongwei LI Shuwei & ZHAO Xin . Key Laboratory of Lithospheric Tectonics Probing Techniques Ministry of Education Beijing China . East China Institute of Technology Fuzhou China . China University of Geosciences Beijing China Correspondence should be addressed to Liu Chengdong 《科学通报(英文版)》2004,49(8):828-828
Granitoidswidelyoccurincontinentalcrustandareusuallygeneratedinresponsetocontinentalgrowthandassociatedcrust-mantleinteraction.Granitoidscanbepro-ducedthroughdifferentways,ofwhichmagmamixinghasdrawnspecialattentionbecauseofitsprofoundbear-ingsoncrust-mantleinteractionandcontinentalgeody-namics[1].Themostdistinctfeatureforgranitoidsformedbymagmamixingisprobablytheoccurrenceofmaficmicrogranularenclaves(MMEs).Sofar,originforMMEsisstillhotlydebated,andavailablehypothesesconsidertheMMEsas(1)ref… 相似文献
420.
LI Qiuli LI Shuguang HOU Zhenhui HONG Ji''''an & YANG Wei School of Earth Space Sciences University of Science Technology of China Hefei China Institute of Geology Geophysics Chinese Academy of Sciences Beijing China 《科学通报(英文版)》2005,50(5):459-465
Methods recently advanced for discrimination on the genesis of metamorphic zircon, such as analysis of mineral inclusions and trace elements, provide us powerful means to distinguish zircon overgrowth during high-pressure metamorphism. Zircons in ultrahigh-pressure eclogite from Qinglongshan in the Sulu terrane were studied by the SHRIMP U-Pb method in combining with trace element and mineral inclusion analyses. No inherited core was identified in the analyzed zircons by means of cathodoluminescence images. The occurrence of high-pressure metamorphic mineral inclusions in zircon, such as garnet, omphacite, rutile, and the flat HREE pattern in zircon indicate that the zircon formed at high-pressure metamorphic conditions. Therefore, a weighted average U-Pb age of 227.4±3.5 Ma obtained from such a kind of zircon is interpreted to represent the timing of peak nietamorphism for the Qinglongshan eclogite. 相似文献