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RESEARCH PROGRESS OF ALTYN FAULT IN WESTERN CHINA

地学前缘 2000年第S1期7卷 243-244页

作者： ge xiaohong, Ye Huiwen, liu yongjiang,{2., pan hongxun, ren shoumai (College of Earth Sciences, Changchun University of Science and Technology, Changchun 130061,China)

As the northern boundary of Tibetan Plateau, the Altyn strike\|slip fault in western China has a very important implication to the tectonic division in the middle Asia continent, and has become a hot topic for the research on continental dynamics of Tibetan Plateau. During the research of our project funded by NSFC, we collected a sample of Caledonian mylonitized granite in the north of Dangjin pass and two samples of Jurassic meta\|sedimentary rocks in Qaidam gate fault\|valley and geshi fault\|valley. The texture study shows that all samples were reformed by ductile deformation with undulating extinction and elongated quartzes. The metamorphic p\|T condition are estimated to be 350～500℃ and 150～450MPa They contain the syntectonic\|growing minerals such as white mica, chlorite, sericite and biotite etc. By dating these minerals, we obtain a group white mica 40 Ar/ 39 Ar isochronal age of 89 2.91 7Ma and a (46 6±6 4)Ma sericite 40 Ar/ 39 Ar appa{2.t age. These data are very important to determine the strike\|slip age of Altyn *** 40 Ar/ 39 Ar age data (91～46Ma), we obtained, are reported for the first time in the researches of Altyn fault belt. The ages of 91～89Ma indicate that Altyn fault began to slip with slight metamorphism around late Jurassic. These ages are consistent with the ages of the collision between Kohistan\|Ladakh massif (northwestern India) and Eurasian continent at 102.*** suggests that the strike\|slip movement of Altyn fault should be related to the formation of the so\|called“Western tectonic joint" in Nepal\|western Kunlun area. The age of 46Ma should represent the overprint age of the tectono\|thermal event during main collision between Indian and Eurasian continents along the Yarlung Zangbo River. With the continent\|continent collision of Indian and Eurasian Plates, Altyn fault underwent Multi\|phase strike\|slip events in late Paleocene—Oligocene (37～35Ma), Miocene (2.～2.Ma), Miocene—Pliocene (8～6Ma), Pliocene (2.5Ma) and early

关键词： reconstruction geochronology tectonic Altyn fault

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Abrupt uplift of Tibetan Plateau at the end of early Pleistocene and Australasian impact event

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Global geology 2009年第3期12卷 145-155页

作者： ren shoumai {2. yongjiang {2. Strategic Research Center ＆ Oil ＆ Gas Resources Ministry of Land ＆ Resources Beifing 100034 China College of Earth Sciences Jilin University Changchun 130061 China

The latest sharp uplift of the Tibetan Plateau and adjacent mountains occurred at the end of the early Pleistocene. The uplift of the Plateau resulted from Late Mesozoic--Cenozoic compressional structure due to the subduction of the Indian Plate beneath the Asian continent. This event definitively effected the formation of basin-mountain relief, Cenozoic basin deformation, large scale aridity and desertification of western China. The Australasian meteorites impact event happened ca. 0.8 Ma ago, located in the triangle area of the Indian Ocean ridge (2.°S/67°E). The impact may have resulted in an acceleration of speeding of the Indian Ocean ridge pushing the Indian Plate to subduct rapidly northward. Thus, the impact event can give reasonable explanation for the dynamic background of the latest rapid uplift of the Tibetan Plateau and the continental deformation of western China and even of the Middle Asia.

关键词： abrupt uplift Tibetan Plateau early Pleistocene

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Laser probe ^(40)Ar/^(39)Ar dating of mica on the deformed rocks from Altyn Fault and its tectonic implications,western China

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Chinese Science Bulletin 2001年第4期46卷 322-325页

作者： liu yongjiang, YE Huiwen, {2., CHEN Wen,{2., ren shoumai & pan hongxunCollege of Earth Sciences, Changchun University of Science and Technology, Changchun 130061, China Graduate School, China University of geosciences, Beijing 100083, China Laboratory of Isotopic geochronology, Institute of geology, Ministry of Land and Resources of China, Beijing 100037, China College of Earth Sciences Changchun University of Science and Technology Changchun China Graduate School China University of Geosciences Beijing China Laboratory of Isotopic geochronology Institute of Geology Ministry of Land and Resources of China Beijing China

The samples of Caledonian mylonitized granite and Jurassic meta-sedimentary rocks were collected in the north of Dangjinshan Pass, Qaidam gate fault-valley and gesi fault-valley. Detailed studies under the microscope and electronic microscope suggest that all the samples contain the syntectonic-growing minerals such as white mica, chlorite, sericite, biotite, etc. By dating these minerals, we got a group of 40Ar/39Ar laser probe isochronal ages of 89-92.Ma and apparent ages of (46.6±6.4) Ma. The ages ranging from 97 to 46 Ma were reported for the first time in the isotopic dating researches of the Altyn Fault The isochronal age group of (98-89) Ma indicates that a ductile strike-slip event, with low-grade metamorphism, began in late Cretaceous. This suggests that the strike-slip movement of the Altyn Fault should be related to the formation of the so-called west tectonic syntaxis in the Nepal-western Kunlun area.

关键词： Altyn Fault 40Ar/39Ar age strike-slip movement.

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LASER PROBE ^(40)Ar/ ^(39)Ar DATING OF MICAS ON THE DEFORMED ROCKS FROM ALTYN FAULT AND ITS TECTONIC IMPLICATIONS,WESTERN CHINA

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地学前缘 2000年第S1期7卷 233-234页

作者： liu yongjiang\+1, Ye Huiwen\+1, {2.\+1,{2.\+1, pan hongxun\+1, Chen Wen\+2.WT5,5”BX](1 College of Earth Sciences, Changchun University of Science and Technology, Changchun 130061,China 2.Laboratory of Isotopic Chronology, Institute of

Recently, the Altyn strike\|slip fault in western China has become a hot topic to the research on continental dynamics of Tibetan Plateau. The chronological research is very important to constrain the age of tectono\|thermal event within Altyn fault belt. Many isotopic dating researches, related to the ophiolites, high\|pressure metamorphic rocks and some granitic rocks, have been done by Chinese and foreign geologists in the area. There, however, are only few isotopic dating researches on the syntectonic\|growing minerals within Altyn fault. We collected a sample of Caledonian mylonitized granite (At3a) in the north of Dangjin pass and two samples of Jurassic meta\|sedimentary rocks in Qaidam gate fault\|valley (At37c) and geshi fault\|valley (At30d). All the samples contain the syntectonic\|growing minerals such as white mica, chlorite, sericite and biotite etc. By dating these minerals, we can constrain the time of the tectonic events occurred in Altyn fault *** At3a, mylonitized granite, has been strongly deformed with undulating extinction of quartz. The plagioclase and quartz were elongated and surrounded by fine\|grained white micas and chlorites with strain shadow texture. These suggest that the sample has been suffered ductile deformation. The estimation of p\|T condition is 350℃, 180MPa. The isochronal age of (89.2.1.6)Ma has been obtained by laser probe 40 Ar/ 39 Ar dating analyses of six white mica grains.

关键词： Ar/ 39 Ar geochronology tectonic Altyn fault

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An Early Stage Faulting Along the Altun Mountain Range——Microstructural Evidences

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Global geology 1999年第2期4卷 160-165页

作者： liu junlai,{2., Ye Huiwen, {2. and liu yongjiang (Changchun Univ. Sci & Tech., 13002., Changchun, China)

Structural, microstructural analysis is done on the Altun fault zo ne and fault rocks. The major characteristics of faulting are summarized. Micros tructural observation reveals a complicated evolution of the fault zone. Much at tention is paid to the microstructural observation and dynamic analysis of fault ing. The occurrence of phengite grains suggest abnormally high pressure conditio ns during ductile deformation and metamorphism, while the occurrence of muscovit e-chlorite mineral assemblage suggest a low temperature and low pressure condit i on. Micro-component analysis on the inter-grown muscovite and chlorite grains gives similar information. It is concluded that the first deformation along the Altun fault zone is a type of ductile shearing, forming mylonites and mylonitic rocks along the fault zone. A post-Jurassic deformation is primarily suggested by the involvement of the l atest tectonic units (Jurassic) in the ductile *** early tectonic ev ent involves deformation and metamorphism under conditions in the upper crust, w ith T-P conditions varying to a large extent (T-2.0℃ ～350℃; P-0.005GPa～0. 43GPa), which may be attributed to the extra tectonic stresses.

关键词： the Altun fault zone mylonites ductile deformation T -P conditions

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^(40)Ar/^(39)Ar age evidence for Altyn fault tectonic activities in western China

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Chinese Science Bulletin 2003年第18期48卷 2024-2030页

作者： liu yongjiang1, J. {2.nser2. ge xiaohong1, F. Neubauer2. G. Friedl2. CHANG Lihua1, ren {2.3 & R. Handler2.1. Colle{2. of Earth Sciences, Jilin University, Changchun 130061, China 2. Institute of {2.ology and Paleontology, Salzburg University, Salzburg A-502., Austrilia 3. Statigraphic Research Center for Oil and Natural Gas, Ministry of Land and Resources, Beijing 100034, China Correspondence should be addressed to liu yongjiang (e-mail: liuyj@ ***) College of Earth Sciences Jilin University Changchun 130061 China

Four 40Ar/39Ar age groups of mica, hornblende and K-feldspar were obtained from Proterozoic and early Paleozoic metamorphic rocks in the Aksay-Dangjin Pass area, western China. The samples away from the middle shear zone of the Altyn fault belt yield two plateau age groups in the range of 461—445.2.Ma and 414.9—342.8 Ma, respec-tively. They represent the tectono-thermal events that had been recorded in the rocks that were displaced by the Altyn strike-slip fault in late Ordovician-early Silurian and Devo-nian, respectively. These two age groups should be related to the closures of Northern and Southern Qilian Oceans. The deformed granitic gneiss from the northern belt gives a pla-teau age group of 178.4—137.5 Ma, which is interpreted as the active age of the Altyn fault in the middle-late Jurassic- early Cretaceous and should be related to the accretion of Lhasa block to the north. The sample from the middle shear zone of the Altyn fault belt yields two plateau ages of 36.4 and 2..3 Ma, respectively, suggesting the strike-slip move-ment with strong metamorphism at greenschist facies along the Altyn fault in the late Eocene. This event occurred in the most areas of the northern Tibet Plateau and should be in response in the north to the collision between Indian and Eurasian continents. The present study demonstrates that the Altyn fault is characterized by multiple pulse-style activi-ties under the tectonic setting of convergence between the Indian and Eurasian continents.

关键词： Altyn fault 40Ar/39Ar age tectono-thermal event western China

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New paleomagnetic evidences of paleogene tectonic rotation of the Qaidam Basin and adjacent region: mechanism and its tectonic implication

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Global geology 2006年第1期9卷 40-48页

作者： Weimin Li yongjiang liu Zhiming Sun {2. ge {2. ren Junling Pei Sihua Yuang Xinzhuan Guo College of Earth Sciences Jilin University Changchun 130061 Jilin China Laboratory of Paleomagnetism Institute of Geomechanics CAGS Beijing 100081 China Strategic Research Center for Oil ＆ Gas Resources Ministry of Land and Resources Beijing 100034 China

In order to better understand the tectonic evolution of the Qaidam Basin. The authors carried out a paleomagnetic study on 39 samples of 7 sites from Hongsanhan section, northwest Qaidam Basin. Stepwise thermo-demagnefizafion isolated a high-temperature component （HTC）, which passes the fold and reversal tests at 95 % confidence level. It suggests that the HTC should be primary. Unblocking temperature （about 685℃ ） and the experiment of isothermal remanence indicate that hematite is the mainly carrier of the remanence. A tilt-corrected mean direction is： Ds= 7.1°, Is= 38.5°, α95 = 7.4°. Corresponding to a palaeopole at, φ= 2.0. 1°E, λ= 72.0°N, A95 = 6.8°, Compared with the reference APWP of Eurasia, the sampling area occurred a non-significant rotation （3.4° ± 5.5°） relative to Eurasia since Eocene due to the affect of left-lateral Altyn fault, Based on the paleomagnetic results of early Cretaceous and Teritary within the Qaidam block, we can obtained the mean clockwise rotations from the samples deposited from 160 Ma to 45 Ma is 2..5° ± 9.0°, and from 38 Ma to present is - 0.5° ± 7.5° relative to present geomagnetism respectively. During the Mid Eocene （45 -38 Ma） rotation phase, there should existing an important early tectonic event in northern part of the present-day Tibetan Plateau, which probably represents one of large-scale strike-slip events of the Altyn strike-slip fault.

关键词： Qaidam Basin Tibetan Plateau Paleomagnetism Eocene Altyn strike-slip Fault

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中国西部治理沙漠化的战略思考与建议

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第四纪研究 2005年第4期25卷 484-489页

作者：葛肖虹任收麦吉林大学地球科学学院中国地质大学地球科学与资源学院北京100083 国土资源部油气资源战略研究中心

中国西部干旱缺水是由于青藏高原隆升造成的,大面积土地荒漠化和沙尘暴的肆虐,既有自然原因,又有因为人们违背自然规律,大量垦荒造田,修建水库和明渠,漫灌农田耗费水资源,破坏生态平衡等主要原因。青藏高原隆升先引起中国西部草原化然... 详细信息

中国西部干旱缺水是由于青藏高原隆升造成的,大面积土地荒漠化和沙尘暴的肆虐,既有自然原因,又有因为人们违背自然规律,大量垦荒造田,修建水库和明渠,漫灌农田耗费水资源,破坏生态平衡等主要原因。青藏高原隆升先引起中国西部草原化然后是沙漠化,顺应此规律西部开发应该是“退耕还草”,恢复草场和天然植被,发展畜牧养殖业,而不是再无节制地垦荒造田发展粮食种植业。2.世纪60～70年代以来,由于新疆、河西走廊的农业开发,在塔里木河上、中游和黑河中、下游修建了数十个中、小型水库,截留地表、地下径流,破坏了原始的生态环境,使大量水在水库、明渠表面蒸发浪费,却引起下游断流,大片胡杨林死亡,罗布泊、居延海等干涸,额济纳旗荒漠化成了沙尘暴的源头。如何改变这种恶性循环,恢复中国西北原有的生态平衡,从根本上遏制中国西部的荒漠化?对于年蒸发量高达600～800mm以上的中国西部地区,生态环境极为脆弱,科学节约地利用水资源十分关键。建议能在塔里木河上游的喀喇昆仑山、南天山和黑河上游的祁连山山顶冰川以下修建高山水库,通过泻水隧洞管道,封闭式地把水输送到下游,这样既可通过水头落差发电,又可沿途通过管道喷灌技术养殖山坡草场和解决下游农田用水,避免蒸发耗费,保持生态平衡。修建这种高山水库和输水管道工程应该纳入国家建设计划,作为国家跨省级的系统治理工程来实施。

关键词：沙漠化战略思考青藏高原隆升生态平衡中国西部地区输水管道工程塔里木河生态环境土地荒漠化畜牧养殖业粮食种植业喀喇昆仑山干旱缺水自然原因自然规律西部草原退耕还草西部开发天然植被 2.世纪农业开发

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^(36)Cl断代法应用于青藏高原末次快速隆升的构造事件研究

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地质学报 2006年第8期80卷 1110-1117,T0001页

作者：任收麦葛肖虹杨振宇林源贤胡勇刘永江 Johann geNSER Andrea B.RIESER 中国地质科学院地质力学研究所吉林大学地球科学学院长春130061 天津地质矿产研究所 300170 青海油田分公司勘探开发研究院敦煌736202 Department of geography and geology University of Salzburg Austria

青藏高原的形成与隆升是多期次的,尤其早更新世晚期的快速隆升对全球气候变化、我国西部盆-山地貌形成与荒漠化的出现有着重大影响,这已成为近年地学研究的热点问题。通过对高原东北缘-柴达木盆地西部地区角度不整合面上下地层中红色泥... 详细信息

青藏高原的形成与隆升是多期次的,尤其早更新世晚期的快速隆升对全球气候变化、我国西部盆-山地貌形成与荒漠化的出现有着重大影响,这已成为近年地学研究的热点问题。通过对高原东北缘-柴达木盆地西部地区角度不整合面上下地层中红色泥岩36Cl断代法定年,首次测定该事件发生在早更新世晚期至中更新世(1.54～0.2.MaB.P.)之间。结合敦煌盆地同时代地层(0.837MaB.P.和1.142.aB.P)的低角度掀斜现象,以及前人在塔里木盆地、柴达木盆地、吐鲁番—哈密盆地、酒西盆地的研究结果,认为早更新世晚期,受青藏高原快速隆升北向挤压作用的影响,我国西北地区发生了一次重要的构造事件,造成大范围的挤压变形与山脉隆升,这对我国西北地区构造格架的最终形成和晚期油气运移成藏具有重要意义。

关键词：柴达木盆地早更新世 ^36Cl断代法定年构造事件

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基于Haar-like特征的空间金字塔的猫脸识别

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智能计算机与应用 2015年第4期5卷 104-107页

作者：张晓红刘岩姚鸿勋哈尔滨工业大学计算机科学与技术学院哈尔滨150001

纹理特征是一种比较常见的图像特征,LBP特征是描述纹理最有效的特征之一。在猫脸识别中,为了提取丰富的纹理信息,同时利用特征点的空间信息,本文在LBP特征上应用空间金字塔SPM。而为了更好地捕捉图像不同空间区域之间的纹理变化,基于Haa... 详细信息

纹理特征是一种比较常见的图像特征,LBP特征是描述纹理最有效的特征之一。在猫脸识别中,为了提取丰富的纹理信息,同时利用特征点的空间信息,本文在LBP特征上应用空间金字塔SPM。而为了更好地捕捉图像不同空间区域之间的纹理变化,基于Haar-like特征的思想,在SPM上应用Haar模板提取不同区域间的纹理差异。在基于Microsoft Cat Dataset进行处理所得到的猫脸数据集上的实验结果验证了所提出方法的有效性。

关键词：纹理特征 LBP特征空间金字塔 Haar-like

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