|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Early Paleozoic ridge subduction in the Chinese Altai: Insight from the abrupt change in zircon Hf isotopic compositions显示文摘Zircons were separated from granitoids, gneisses, and sedimentary rocks of the Chinese Altai. Those with igneous characteristics yielded U-Pb ages of 280-2800 Ma, recording a long history of magmatic activity in the region. Zircon Hf isotopic compositions show an abrupt change at ~420 Ma, indicating that prior to that time the magmas came from both ancient and juvenile sources, whereas younger magmas were derived mainly from juvenile material. This may imply that the lithosphere was signifi- cantly modified in composition by a rapid addition of melt from the mantle. We suggest that this dramatic change was due to the onset of ridge subduction, which can account not only for the formation of voluminous granitoids, mafic rocks with complex compositions, and the association of adakite + high-Mg andesite + boninite + Nb-enriched basalt, but also for the coeval high-T, low-P metamorphism. | SUN Min LONG XiaoPing CAI KeDa JIANG YingDe WANG BuYun YUAN Chao ZHAO GuoChun XIAO WenJiao WU FuYuan | 2009 | Science China Earth Sciences2009，52，9： | 33 |
| 2 | Rare and endangered plant species of the Chinese Altai Mountains显示文摘Altai (also named Altay in China) Mountain Country (Mountain System) is a unique natural region,located on the border between different floristic regimes of the Boreal and ancient Mediterranean sub-kingdoms,where distribution of plant species is actually limited. It is known to have sufficient endemic floral biodiversity in the Northern Asia. Many plants of Altai Mountain System need effective care and proper conservation measures for their survival and longer-term protection. Important Plant Area identified as the IUCN (the International Union for Conservation of Nature),specified criteria attract global attention for protection of floral biodiversity across the world. The records of 71 plant species from the Chinese Altai Mountains attributed to the criterion A and the dark conifer forests of Chinese Altai Mountains satisfied the criterion C,which may help qualify to fulfill the national obligation of the Convention on Biological Diversity. | Marina V.OLONOVA | 2010 | Journal of Arid Land2010，2，3： | 3 |
| 3 | Geochemistry, geochronology and Hf isotope of granitoids in the Chinese Altai: Implications for Paleozoic tectonic evolution of the Central Asian Orogenic Belt显示文摘The Chinese Altai in northwestern Xinjiang has numerous outcrops of granitoids which provide critical information on accretionary orogenic processes and crustal growth of the Central Asian Orogenic Belt.Zircon U-Pb ages, Hf-isotopic compositions and whole-rock geochemistry of monzogranite and granodiorites in the Qinghe County are employed to elucidate Paleozoic tectonics of the Chinese Altai. Granodiorites have crystallization ages of 424.6 ± 3.1 Ma(MSWD = 0.23) and 404.0 ± 3.4 Ma(MSWD = 0.18);monzogranite was emplaced in the early Permian with a crystallization age of 293.7 ± 4.6 Ma(MSWD = 1.06). Both granodiorites and monzogranite are I-type granites with A/CNK ratios of 0.92 -0.97 and 1.03 -1.06, respectively. They also show similar geochemical features of high HREE and Y contents, low Sr contents and Sr/Y ratios, as well as enrichment of Cs, Rb, Th and U, and depletion of Nb, Ta, P and Ti.These geochemical features indicate that the monzogranite and granodiorites were formed in an arc setting related to subduction. The gneissic monzogranites display high SiO_2 and K_2 O contents, and belong to the high-K calc-alkaline series. In the chondrite normalized REE distribution pattern, the monzogranite samples exhibit enrichment of LREE with strong negative Eu anomalies(σE u =0.44 -0.53), zircon εHf(t) values from +7.24 to +12.63 and two-stage Hf model ages of 463 -740 Ma. This suggests that the monzogranite was generated from the mixing of pelitic and mantle material. The granodiorite samples are calc-alkaline granites with lower contents of Si O_2 and Na_2 O + K_2 O, higher contents of TiO_2, Fe_2O_3~t, MgO and CaO compared to the monzogranite samples. They also show enrichment of LREE and moderate negative Eu anomalies(σE u= 0.54 =0.81), as well as slightly higher differentiation of LREE than that of HREE. The425 Ma granodiorite has zircon εHf(t) values from -0.51 to +1.98 and two-stage Hf model ages of 1133 -1240 Ma, whereas the 404 Ma granodiorite displays those of +2.52 to +7.50 and 816 -1071 Ma.Geochemistry and zircon Hf isotopic compositions indicate that granodiorites were formed by partial melting of juvenile lower crust. Together with regional geology and previous data, the geochemical and geochronological data of the monzogranite and granodiorites from this study suggest long-lived subduction and accretion along the Altai Orogen during ca. 425 -294 Ma. | Dengfeng He Yunpeng Dong Xueyi Xu Junlu Chen Xiaoming Liu Wei Li Xiangmin Li | 2018 | Geoscience Frontiers2018，9，5： | 3 |
| 4 | Electromagnetic monitoring in the region of seismic activization (on the Gorny Altai (Russia) example)显示文摘Based on the analysis of the field data of nonstationary electromagnetic soundings with different installations,the evolution of the stressed state of the geological massif in the epicentral region of the destructive 2003 M_w7.3 Chuya earthquake is investigated in the paper.The measurements by these methods were executed in a lot of regular points located at two sites of the western part of the Chuya basin of Gorny Altai(Russian Federation).The field works have been performed for 13 years.We developed a measurement technique using data from the three Transient Electromagnetic Method(TEM)method settings for determination of the resistivity anisotropy coefficient.Interpretation of the field data is carried out based on the inverse problem solution,and further,taking into account the geological structure and seismological data,variations of true electrophysical characteristics of the cross-section(electrical resistivity and resistivity anisotropy coefficient)are analyzed.According to the TEM data acquired in the 1980 s,the geoelectric parameters of rocks in the period of low seismic activity were estimated.Comparison of the results of quantitative interpretation of the modern measurements(2004-2016)with those taken before the Chuya event allows tracing a change in the geoelectric parameters of the cross-section in the aftershock period,and on this basis tracking the evolution of the rock massif after the destructive seismic impact. | Nina N.Nevedrova Aidisa M.Sanchaa Alexander E.Shalaginov Sergey M.Babushkin | 2019 | Geodesy and Geodynamics2019，10，6： | 1 |
| 5 | A Special Issue Devoted to the Accretionary and Collisional Tectonics of the Altaids and its Metallogeny显示文摘Altaids:The conception The Altaids is tectonically sandwiched between the Baltica and Siberia cratons to the north and the Tarim and North China cratons to the south(Sengor et al.,1993).This huge orogen has been also called the Altaid collage(Yakubchuk,2004),Central Asian Orogenic Belt(CAOB)(Jahn et al.,2000a),or Central Asian Orogenic System(Briggs et al.,2007).Long before these terms,the Altaids even had been called the Asian Foldbelt,Ural-Mongolian Foldbelt,or Ural-Amurian Foldbelt,mostly by the former Soviet Union scientists(Yakubchuk,2004). | XIAO Wenjiao LIU Yongjiang HOU Zengqian LI Shan | 2019 | Acta Geologica Sinica(English Edition)2019，93，5： | 1 |
| 6 | Uranium in Saline Lakes of Mongolia and Adjacent Areas显示文摘1 Introduction Increasing demand for uranium raw materials for the nuclear industry has stimulated interest in non-traditional sources,including hydromineral ones[Qin,2009].Those are saline lakes located in the uranium ore districts.Accumulation of uranium in such lakes results from the leaching of uranium from the rocks by surface and | Vitaly ISUPOV Ariunbileg SODOV Svetlana SHATSKAYA Marina KOLPAKOVA Ljudmila RAZVOROTNEVA Alexander VLADIMIROV Stepan SHVARTSEV Leonid KUIBIDA Sergey KRIVONOGOV Ekaterina MOROZ | 2014 | Acta Geologica Sinica(English Edition)2014，88，S1： | 1 |
| 7 | STRESS METAMORPHISM AND ISOTOPIC AGE OF SHEAR ZONE GRANITOID TECTONITES OF IRTYSH SHEAR ZONE (ALTAI REGION)显示文摘The Irtysh shear zone (ISZ) of Altai region is the lineament structure of the collision suture type, where granites of Kalba complex and granodiorites of Zmeinogorsk complex are exposed to regional gneiss formation and stress metamorphic alterations. This study is based on detailed structural observations at special grounds using optical and electron microscopy, and on the behavior analysis of isotopic systems from altered granitoids.Within the ISZ area we have established the continuous rows of granitoid stress metamorphism from initial recrystallization of protolite, its cataclasis and mechanical flaring up to complete recrystallization with alteration of mineral composition and formation of the streaky complexes of granite tectonites of blastomylonite and blastocataclasite types. The directed alteration of rocks has several impulse and is expressed by a change in morphology of mineral grains and their relations, magnification of deformation component in the rock structure, and formation of new mineral phases on the basis of initial ones without surface fluidization. At transformation of isotopic systems from granitoid, their feldspars, biotite and hornblende, we can observe “rejuvenation” of the rock substrate from 270-290 Ma for Kalba granitoids to 220-235 Ma for their tectonites, and for Rudny Altai granodiorites, their ages changes from 285-317 Ma to 232-257 Ma for their tectonites. | B.M. Chikov, V.A. Ponomachuk, S.V. Zinoviev, B.N. Lapin, A.T. Titov, A.V. Travin and S.V. Palessky(The United Institute of Geology, Geophysics and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk) | 2002 | Geotectonica et Metallogenia2002，26，1： | 1 |
| 8 | Altaids,continental growth and metallogeny显示文摘The Altaids,occupying vast tracts between the Baltica and Siberia Cratons to the north and the Tarim and North China Cratons to the south,was constructed by multiple subductions of the Paleo-Asian Ocean(PAO)from the Neoproterozoic to early Mesozoic[1,2].The Altaids typifies the largest accretionary orogenic collage on Earth and holds key information regarding cutting-edge theories of orogenic architecture and continental growth and economic benefits[2]. | Wenjiao Xiao | 2023 | National Science Review2023，10，2： | 0 |
| 9 | Ancient mitochondrial genome depicts sheep maternal dispersal and migration in Eastern Asia显示文摘Sheep have been one of the most important groups of animals since ancient times.However,the knowledge of their migration routes and genetic relationships is still poorly understood.To investigate sheep maternal migration histories alongside Eurasian communications routes,in this study,we obtain mitochondrial genomes(mitogenomes)from 17 sheep remains in 6 Chinese sites and 1 Uzbekistan site dated 4429–3100 years before present(BP).By obtaining the mitogenomes from the sheep(4429–3556 BP)found in the Tongtian Cave site in Xinjiang,Altai region of northwest China,our results support the emergence of haplogroup C sheep in Xinjiang as early as 4429–3556 BP.The combined phylogenetic analyses with extant ancient and modern sheep mitogenomes suggest that the Uzbekistan-Altai region may have been a migration hub for early sheep in eastern Asia.At least two migration events have taken place for sheep crossing Eurasia to China,one passing by Uzbekistan and Northwest China to the middle and lower reaches of the Yellow River at approximately 4000 BP and another following the Altai region to middle Inner Mongolia from 4429 BP to 2500 BP.Overall,this study provides further evidence for early sheep utilization and migration patterns in Eastern Asia. | Liu Yang Xing Zhang Yaning Hu Piao Zhu Hua Li Zhenyu Peng Hai Xiang Xinying Zhou Xingbo Zhao | 2024 | Journal of Genetics and Genomics2024，51，1： | 0 |
| 10 | Geomorphological processes and landforms of glacier forelands in the upper Aktru River basin(Gornyi Altai), Russia: evidence for rapid recent retreat and paraglacial adjustment显示文摘The glaciers in the Aktru River basin of Gornyi Altai, Russia currently represent some of the fastest receding glaciers in the world. Formation of the morainic complexes closest to the contemporary glaciers in the Aktru River basin took place during the 17^th-18^th centuries with recession commencing at the end of the 18 th century. Coupled with this glacial retreat, earth surface processes and vegetation succession are responding to shape the glacier forelands. This article presents the first geomorphological maps for the upper reaches of the Aktru River basin and focuses on the geomorphological landforms that occur in the rapidly changing glacier forelands. Geomorphological mapping is difficult in steep mountainous regions and, thus, mapping was completed using satellite imagery, field mapping and observations coupled with highresolution aerial photography obtained from Unmanned Aerial Vehicles(UAVs). Critical steps of the procedure used to process UAV imagery and difficulties encountered in this mountainous terrain are noted. The acquired spatial data enable the mapping and classification of small-scale transient geomorphological features such as talus, glacial and glaciofluvial landforms. Their dynamics provide insights into supraglacial and subglacial processes of the glaciers of the Aktru River basin and subsequent paraglacial adjustment. The presented highresolution spatial data, which can also be obtained at high temporal resolutions in the future, can act as a reference frame for geomorphologists and ecologists studying the temporal evolution of glacier forelands of the Aktru River basin during paraglacial adjustment and subsequent colonisation and stabilisation by biota. | David W.HEDDING Aleksander A.EROFEEV Christel D.HANSEN Alexey V.KHON Zamir R.ABBASOV | 2020 | Journal of Mountain Science2020，17，4： | 0 |
| 11 | Zonal Metamorphic Complex in the Tongulack Mountain Ridge, Altai, Russia, and Explanation ofIts Origin with the Help of Thermal Modelling显示文摘A moderate pressure / high temperature zonal metamorphic complex in the Tongulack Mountain Ridge, Altai, Russia, is described, and the applicability of the models of magmatic intrusion and fluid flow to explanation of its origin discussed. The Precambrian complex was formed at 500-700℃ and 3.0-5.5 kbars; it is a linear, 25-30 km wide, thermal anticline with a curved axis showing symmetric metamorphic zoning. The metamorphism was isochemical by its nature, as is corroborated by the chemical compositions of the rocks. Four zones can be recognized within the metamorphic complex: chloritic (on the peripheries), cordieritic, sillimanitic and staurolite-out (in the centre). The zones are separated by successive isograds: cordierite, staurolite-in or sillimanite and staurolite-out. It is argued that the origin of the metamorphic zoning can be explained best by a combined fluid-magmatic model; conductive heat flow from the intrusion predominated considerably over the fluid flux in heat transfer: the fluid | G.G.Lepezin V.V.Reverdatto | 1998 | Acta Geologica Sinica(English Edition)1998，72，1： | 0 |
| 12 | A New Discovery of Early Carboniferous Gabbros in the Southern Chinese Altai: Evidence for Ridge Subduction显示文摘Objective The Chinese Altai as a key part of the Central Asian Orogenic Belt is characterized by numerous outcrops of Paleozoic granitoids and minor mafic plutons (Fig. 1a). It is widely accepted that Devonian ridge subduction played an important role in the tectonic evolution of the Chinese Altai. However, Carboniferous magmatism related to ridge subduction has received little attention. Moreover。 | WANG Zuopeng LI Yongjun YANG Gaoxue ZHANG Yuling CHAO Wendi | 2020 | Acta Geologica Sinica(English Edition)2020，94，4： | 0 |
| 13 | GEOCHEMICAL EFFECTS OF MAJOR ELEMENTS DURING FLUID ROCKS INTERAC TION IN MARINWOBO FAULT IN THE SOUTH MARGIN AREAS OF ALTAI MOUNTAINS显示文摘There are four types of metamorphic rocks in the Marinwobo fault, i.e, cataclasite, mylonite, mictosite and migmatitic granite, and the formation of these rocks is due to the progressive metamorphism of the pyroclastics. The fluids play a very important role in the metamorphic process of these rocks in the Marinwobo fault, the most important feature is that the fluids not only result in the migration of the major elements of the deformation rocks, but also result in the volume loss of the deformation rocks in the deformation process. Thus the migration laws of the major elements in different stages of the progressive metamorphic process are discussed according to mass balance equations. Finally, the quantitative analysis of the mass loss and volume loss of the different rocks the in Marinwobo fault is discussed in this paper. | ZHAO Zhi zhong1, ZENG Qiao song2 and BI Hua1(1. Department of Resources, Environment and Tourism, Hainan Normal University, Haikou Hainan 571158, China 2. Changsha Institute of Geotectonics, Chinese Academy of Sciences, Changsha Hunan 410013, China) | 2002 | Geotectonica et Metallogenia2002，26，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员