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2009 Vol. 20, No. 2

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杨经绥, 李海兵
2009, 20(2) doi: 10.1007/s12583-009-0020-5
High-Pressure Eclogite-Blueschist Metamorphic Belt and Closure of Paleo-Tethys Ocean inCentral Qiangtang, Qinghai-Tibet Plateau
李才, 翟庆国, 董永胜, 刘燊, 解超明, 吴彦旺
2009, 20(2) doi: 10.1007/s12583-009-0021-4
The high-pressure metamorphic belt (HPMB) of eclogite-blueschist in Central Qiangtang (羌塘) lies in the Longmu Co (龙木错)-Shuanghu (双湖) suture zone. To the west, the HPMB extends 500 km from Hongjishan (红脊山) to Caiduochaka (才多茶卡), east of Shuanghu; to the east it extends to Baqing (巴青) and Jitang (吉塘) in Qamdo (昌都), and then bends southward to Yunnan (云南) Province...
P-T Paths Derived from Garnet Growth Zoning in Danba Domal Metamorphic Terrain, Sichuan Province, West China
程素华, 赖兴运, 游振东
2009, 20(2) doi: 10.1007/s12583-009-0022-3
Danba (丹巴) domal metamorphic terrain belongs to Songpan (松潘)-Ganze (甘孜) orogenic belt, where typical Barrovian and Buchan metamorphic zones are preserved. The former included chlorite, biotite, garnet, staurolite, kyanite and sillimanite zones, while the latter only developed silimanite+muscovite and sillimanite+K-feldspar zones...
Mantle Input to the Crust in Southern Gangdese, Tibet, during the Cenozoic: Zircon Hf Isotopic Evidence
莫宣学, 董国臣, 赵志丹, 朱弟成, 周肃
2009, 20(2) doi: 10.1007/s12583-009-0023-2
The Quxu (曲水) complex is a typical intrusive among the Gangdese batholiths. Two sets of samples collected from the Mianjiang (棉将) and Niedang (聂当) villages in Quxu County, including gabbro, mafic micro-enclaves (MME), and granodiorites in each set, were well dated in a previous SHRIMP zircon U-Pb analysis (47–51 Ma). In this article, the same zircons of the 6 samples were applied for LA ICP-MS Hf isotopic analysis...
Post-Orogenic Granites in Pingwu Region,Northwest Sichuan: Evidence forNorth China Block and Yangtze Block Collision during Triassic
裴先治, 李佐臣, 丁仨平, 冯建赟, 李瑞保, 孙雨, 张亚峰, 刘战庆
2009, 20(2) doi: 10.1007/s12583-009-0024-1
The Nanyili (南一里), Laohegou (老河沟), and Shaiziyan (筛子岩) granitic intrusions are located in the southern margin of the Bikou (碧口) block in Pingwu (平武) area, Northwest Sichuan (四川). The petrography and geochemical characteristics of the granitic intrusions as well as their source and tectonic settings are reported and discussed in this article...
SiO2 Solubility in Rutile at HighTemperature and High Pressure
任玉峰, 费英伟, 杨经绥, 白文吉
2009, 20(2) doi: 10.1007/s12583-009-0025-0
Silicon-bearing rutile has been found in chromitite from the Luobusa (罗布莎) ophiolite, Tibet. However, the extent of SiO2 solubility in rutile and the nature of its origin are still unclear. At high pressure, SiO2 takes a rutile structure with Si in 6-fold coordination...
Unusual Mantle Mineral Group from Chromitite Orebody Cr-11 in Luobusa Ophiolite of Yarlung-Zangbo Suture Zone, Tibet
徐向珍, 杨经绥, 陈松永, 方青松, 白文吉, 巴登珠
2009, 20(2) doi: 10.1007/s12583-009-0026-z
A wide variety of unusual mantle has been reported from podiform chromitite orebodies Cr-31 and Cr-74 in the Luobusa (罗布莎) ophiolite, Tibet. A detailed investigation of chromitite orebody Cr-11, located in the Kangjinla (康金拉) district at the eastern end of the ophiolite, has revealed many of the same minerals, including diamond, moissanite, and some native elements, alloys, oxides, sulphides, silicates, carbonates, and tungstates...
Dur’ngoi Ophiolite in East Kunlun, NortheastTibetan Plateau: Evidence for Paleo-TethyanSuture in Northwest China
杨经绥, 史仁灯, 吴才来, 王希斌
2009, 20(2) doi: 10.1007/s12583-009-0027-y
The A’nyemaqen (阿尼玛卿) ophiolite belt along the southern margin of the East Kunlun (昆仑) Mountains marks the suture formed by the closure of paleo-Tethys. The Dur’ngoi ophiolite in the eastern part of this belt consists of meta-peridotite, mafic-ultramafic cumulates, sheeted dikes and basaltic lavas. The meta-peridotites consist of dunite, harzburgite, lherzolite, feldspar-bearing lherzolite and garnet-bearing lherzolite and contain residual spinel with Cr# [100×Cr/(Cr+Al)] ranging from 30 to 57 and Mg# [100×Mg/(Mg+Fe2+)] ranging from 50 to 75, indicating an Al- and Mg-rich series...
Ultramafic Blocks in Sumdo Region, Lhasa Block, Eastern Tibet Plateau: An Ophiolite Unit
Chen Songyong* (陈松永), Yang Jingsui (杨经绥), Li Yuan (李源), Xu Xiangzhen (徐向珍)
2009, 20(2) doi: 10.1007/s12583-009-0028-x
Recently, an over 100 km long MORB-type eclogite belt of Permian was discovered in the Sumdo (松多) region of the Lhasa block, Tibet. A critical question thus is: what is the tectonic setting of the eclogite belt and is it related to an unrecognized suture in the region? Further investigations show that there are some mafic and ultramafic rocks spacially associated with the eclogite belt in the region. Three ultramafic massifs were recognized in the Sumdo region, and called the Luomaling (罗马岭), Gongbupala (贡布爬拉) and Qiazhasumdo (卡扎松多) massifs. All the massifs are fault-contacted with greenschist (Chasagang (岔萨岗) Formation) or muscovite-quartz schist (Mabuku (马布库) Formation), and individuals are about 100 m×50 m in size extending in EW as the regional structure...
Records of Indosinian Orogenesis in LhasaTerrane, Tibet
Li Huaqi* (李化启), Xu Zhiqin (许志琴), Yang Jingsui (杨经绥), Cai Zhihui (蔡志慧), Chen Songyong (陈松永), Tang Zemin (唐泽民)
2009, 20(2) doi: 10.1007/s12583-009-0029-9
Based on the deformation characteristics of the ductile shear zones in Sumdo (松多) Group, the quartz fabric by EBSD (electron backscatter diffraction), the data of muscovite 40Ar-39Ar geochronology (220–230 Ma) from ductile shear zones and the zircon SHRIMP U-Pb chronology (190 Ma) of granites in Sumdo region, Lhasa (拉萨) terrane is thought to have experienced an important Indosinian orogenic event at 220–230 Ma, which caused the closure of the paleo-Tethys Ocean along the tectonic zone of eclogite and the collision between northern part and southern part of the Lhasa terrane...
Middle Permian Seamount from Xiahe Area, Gansu Province, Northwest China: Zircon U-Pb Age, Biostratigraphy and TectonicImplications
寇晓虎, 张克信, 朱云海, 陈中强, 林启祥, 陈奋宁, 黄金元
2009, 20(2) doi: 10.1007/s12583-009-0030-3
The well-preserved seamount buildups are documented from the northwestern Qinling (秦岭) orogenic belts, Northwest China. The study sections are located in the Ganjia (甘加) area of the Xiahe (夏河) County, Gansu (甘肃) Province. The dark basalt and overlying massive reef carbonate characterize the Xiahe seamount buildup. Basalts are dominated by the olivine type of rocks and bear distinct porphyritic textures, and fumarole and amygdaloidal structures...
Late Oligocene–Early Miocene Thrusting in Southern East Kunlun Mountains, NorthernTibetan Plateau
吴珍汉, 叶培盛, 胡道功, 赵文津, 吴中海
2009, 20(2) doi: 10.1007/s12583-009-0031-2
Southward thrusting occurred in Late Oligocene–Early Miocene in southern East Kunlun (昆仑) Mountains formed the South Kunlun thrust (SKT). Permian strata and Triassic rocks were thrusted over the Paleocene–Eocene red-beds of Fenghuoshan (风火山) Group and Oligocene brownish red conglomerate and sandstone of Yaxicuo (雅西错) Group along SKT faults, formed tectonic slices, low-angle thrust faults, multi-scaled outliers, and nappe structures in south of Middle Kunlun fault (MKF). In addition, SKT displacement or shortening is estimated to be ~(30–35) km across Dongdatan (东大滩) valley and East Wenquan (温泉) basin...
Late Neogene Mountain Building of EasternKunlun Orogen: Constrained by DEM Analysis
王岸, 王国灿, 张克信, 向树元, 李德威, 刘德民
2009, 20(2) doi: 10.1007/s12583-009-0032-1
Topography, as a net result of the dynamic interaction between endogenesis and exogenesis, holds immense information on tectonic uplift, surface erosion and thus mountain building. The eastern Kunlun (昆仑) orogen, which experienced significant Late Neogene tectonic uplift and is located in an arid environment, is advantageous for morphotectonic analysis based on well-preserved tectonic landforms...
Uplift of Northwest Margin of Tibetan Plateau: Indicated by Zircon LA ICP-MS U-Pb Dating of Conglomerate from Mazartagh, Tarim Basin
司家亮, 李海兵, 裴军令, 潘家伟
2009, 20(2) doi: 10.1007/s12583-009-0033-0
Radiometric age dating of detrital zircons is highly advantageous for analysis of the depositional environment and to identify source areas. Aiming at the uplift and denudation of the surrounding ranges, LA ICP-MS U-Pb analysis has been performed on zircon grains from a conglomerate collected at the Lower Pliocene of Mazartagh, which is in the center of the Tarim basin, Xinjiang (新疆), China. A wide range of ages mainly falling into three groups was yielded: 200–500, 800–1 100, and 1 800–2 000 Ma. Zircon features principally indicate magmatic origin...
Evidence for Tibetan Plateau Uplift in QaidamBasin before Eocene–Oligocene Boundary and Its Climatic Implications
裴军令, 孙知明, 王喜生, 赵越, 葛肖虹, 郭新转, 李海兵, 司家亮
2009, 20(2) doi: 10.1007/s12583-009-0035-y
Geometry analysis of the Hongsanhan (红三旱) Section in the northwestern Qaidam basin illustrates the typical growth strata in the Xiaganchaigou (下干柴沟) Formation. The age and sedimentation rates of the Xiaganchaigou and the Shangganchaigou (上干柴沟) formations were determined by the high-resolution magnetostratigraphy. This result shows that the growth strata began to form at ca. 38.0 Ma and increased sedimentation rates occurred at ca. 37.0 Ma...
Digital Simulation on Convergence Tendencybetween Southwest Tienshan and Pamirs-West Kunlun Systems and Its Significance
邱祝礼, 李海兵, 裴军令
2009, 20(2) doi: 10.1007/s12583-009-0034-z
The collision between India plate and Eurasia continent 55 Ma ago caused the convergence between Southwest Tienshan and Pamirs tectonic systems, and conclusions by other researchers also suggest that the convergence will continue. Studies on the collision between these systems are helpful to the knowledge of the history and the tendency of the in-land tectonics since Cenozoic and are important in science and the real world as for environment changes, resources and energy reform, and forecast of earthquakes...
Test of Deep Seismic Reflection Profilingacross Central Uplift of QiangtangTerrane in Tibetan Plateau
卢占武, 高锐, 李秋生, 贺日政, 匡朝阳, 侯贺晟, 熊小松, 管烨, 王海燕
2009, 20(2) doi: 10.1007/s12583-009-0036-x
A test of deep seismic reflection profiling across the central uplift or metamorphic belt of the Qiangtang (羌塘) terrane, Tibetan plateau, provides a first image of the crustal structure. Complex reflection patterns in the upper crust are interpreted as a series of folds and thrusts, and bivergent re-flections in the lower crust may represent a convergence between the Indian and the Eurasian plates.
Moho Depth of Qinghai-Tibet PlateauRevealed by Seismic Probing
熊小松, 高锐, 李秋生, 卢占武
2009, 20(2) doi: 10.1007/s12583-009-0037-9
The Qinghai (青海)-Tibet plateau is the newest and biggest orogenic belt in the world and a natural laboratory for researching continental geodynamics, such as continent-continent collision, convergence, subduction, and plateau uplift. From the 1950s to the present, there have been many active-source (deep seismic sounding and deep seismic reflection profiling) and passive-source seismic probing (broadband seismic observations) implemented to reveal the crust-mantle structure...
Structural Architecture and Evolution ofKumkuli Basin, North Tibet
何碧竹, 许志琴, 焦存礼, 崔军文, 王生朗, 汪功怀, 李朝阳, 邱祝礼
2009, 20(2) doi: 10.1007/s12583-009-0038-8
Utilizing the new data of gravity, magnetic, and magnetotelluric survey, we analyzed the characteristics of the three geophysical attribute (gravity, magnetic, and resistivity) interfaces and the deep architecture and structure of Kumkuli basin. The research results can provide basic data for early basin structural study...
Compressive Tectonics around Tibetan Plateau Edges
Zhao Zhixin* (赵志新), Xu Jiren (徐纪人)
2009, 20(2) doi: 10.1007/s12583-009-0039-7
Various earthquake fault types, mechanism solutions, stress field, and other geophysical data were analyzed for study on the crust movement in the Tibetan plateau and its tectonic implications. The results show that numbers of thrust fault and strike-slip fault type earthquakes with strong com-pressive stress near NNE-SSW direction occurred in the edges around the plateau except the eastern boundary. Some normal faulting type earthquakes concentrate in the Central Tibetan plateau...
Continental Dynamics in High Tibetan Plateau: Normal Faulting Type Earthquake Activities and Mechanisms
Xu Jiren* (徐纪人), Zhao Zhixin (赵志新)
2009, 20(2) doi: 10.1007/s12583-009-0040-1
Various earthquake fault types were analyzed for this study on the crust movement in the high region of the Tibetan plateau by analyzing mechanism solutions and stress fields. The results show that a lot of normal faulting type earthquakes are concentrated in the central High Tibetan plateau. Many of them are nearly perfect normal fault events...
Post-Orogenic Granites in Pingwu Region,(Table)
裴先治, 李佐臣, 丁仨平, 冯建赟, 李瑞保, 孙雨, 张亚峰, 刘战庆
2009, 20(2)
Records of Indosinian Orogenesis in Lhasa(Table)
Li Huaqi* (李化启), Xu Zhiqin (许志琴), Yang Jingsui (杨经绥), Cai Zhihui (蔡志慧), Chen Songyong (陈松永), Tang Zemin (唐泽民)
2009, 20(2)
Middle Permian Seamount from Xiahe Area, Gansu Province, Northwest China: Zircon U-Pb Age, Biostratigraphy and Tectonic(Table)
寇晓虎, 张克信, 朱云海, 陈中强, 林启祥, 陈奋宁, 黄金元
2009, 20(2)