New Zircon U-Pb Ages of the Shirenshan Gneiss,North Qinling and Their Geological Implications     

WANG Jingy  REN Shenglian  JIANG Dazhi  DONG Shuwen  LI Jiahao  LI Longming  GE Can  SONG Chuanzhong  HAN Xu  LI Zhenqiang 《《地质学报》英文版》2019,93(1):238-240

正Objective The Qinling Orogenic Belt(QOB)is a composite continental orogenic belt that has experienced many tectonic events. The QOB is subdivided into the following three lithotectonic units:the North Qinling terrane,the Middle Qinling microplate and the South Qinling terrane.  相似文献   

Geochronology and Geochemistry of Liaohe Group and Liaoji Granitoid in the Jiao-Liao-Ji Belt, North China Craton, and its Tectonic Implications     

DONG Yu  GE Wenchun  BI Junhui  YANG Hao  JI Zhenga 《《地质学报》英文版》2019,93(Z2):174-175

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Lithofacies Recognition of Deep Lacustrine Chang-7-Chang-8 Fine Grain Sandstone in Ordos Basin     

DU Kefeng  GE Yunjin  YANG Jingwei 《《地质学报》英文版》2019,93(Z2):296-296

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Babu (SW China)‐Cao Bang (NE Vietnam) Ophiolite Complex: Implications for Tectonic Evolution between South China and the Indochina Block     

MA Tianshou  WANG Lixing  GE Guangfu  DAI Chunzheng  YU Hao 《《地质学报》英文版》2019,93(Z2):34-36

The convergence process between South China and the Indochina Block is still controversial. A large number of igneous rocks scattered along the current China‐Vietnam border provide a good opportunity to investigate the tectonic evolution. Babu ophiolites, cropping out in the southeastern Yunnan province (SW China), consist primarily of metaperidotite, serpentinite, pillow basalt (metabasalt), gabbro, metadiabase. Most of them are fault contacted and strongly sheared, especially between metaperidotite/serpentinite and metabasalt. U‐Pb zircon analyses yield an Early Permian formation age of ～278 Ma. Basalts and metagabbros show light rare earth elements (LREEs)‐depleted and heavy rare earth elements (HREEs)‐flat REE patterns, and large ion lithophile elements (LILEs)‐depleted primitive‐normalized spider diagrams without Nb‐Ta anomalies, which is similar to N‐MORB. Metaperidotites have low initial ¹⁸⁷Os/¹⁸⁸Os (0.122‐0.126) and γOs values, and indicate that they were derived from a depleted mantle source. Relative low (⁸⁷Sr/⁸⁶Sr)i and high εNd(t) values of basalts and metagabbros also support their DMM origin. The petrological, geochemical and isotope characteristics suggest that Babu ophiolites were N‐MORB‐type and represent remnants of an Early Permian oceanic crust. Mafic‐ultramafic rocks exposed in Cao Bang area (NE Vietnam) have recently been considered as dismembered Paleotethyan ophiolites instead of were genetically linked to the Emeishan Large Igneous Province. U‐Pb zircon analyses suggest an Early‐Middle Permian age (274 ±18 Ma) for the formation of ultramafic rocks. Both whole rock geochemistry and Cr‐spinel mineral chemistry show MORB‐like characteristics. Field observations suggest that Babu and Cao Bang ophiolite complex structurally overlie Middle‐Triassic deposits, and form a tectonic mélange zone. It developed from the subduction of a Paleotethyan subsidiary ocean basin between the South China and Indochina blocks until their collision..  相似文献   

A strategy of the rural governance for territorial spatial planning in China   总被引：2，自引：2，他引：0  

GE Dazhuan  LU Yuqi 《地理学报(英文版)》2021,31(9):1349-1364

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New dating indicates intermittent human occupation of the Nwya Devu Paleolithic site on the high-altitude central Tibetan Plateau during the past 45,000 years     

Junyi GE  Xiaoling ZHANG  Shejiang WANG  Linhui LI  Wei HE  Yingshuai JIN  Peiqi Zh ANG  Bing XU  Chenglong DENG  John W.OLSEN  Zhengtang GUO  Xing GAO 《中国科学:地球科学(英文版)》2024,(2):531-551

The timing and mechanisms of the human occupation of the demanding high-altitude Tibetan Plateau environment are of great interest. Here, we report on our reinvestigations and dating of the Nwya Devu site, located nearly 4600 meters above sea level on the central Tibetan Plateau. A new microblade techno-complex was identified on a lower lake shore at this site,distinct from the previously reported blade tool assemblage. These two lithic assemblages were dated to 45.6±2.6 and10.3±0.5 ka using opt...  相似文献   

THREE-DIMENSIONAL CALCULATION OF PARTICLE-LIQUID TWO-PHASE TURBULENT FLOW IN A HYDRAULIC TURBINE RUNNER     

WU Yulin  +  GE Liang  +  WANG Lin  +  CAO Shuliang  + 《国际泥沙研究》1999,(3)

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Regulation of different light conditions for efficient biomass production and protein accumulation of Spirulina platensis     

Yufei ZHANG  Xianjun LI  Yuhui LI  Shiqi LIU  Yanrui CHEN  Miao JIA  Xin WANG  Lu ZHANG  Qiping GAO  Liang ZHANG  Daoyong YU  Baosheng GE 《海洋湖沼学报（英文）》2024,(1):174-186

Light plays an important role in the photosynthesis and metabolic process of microalgae.However, how different light conditions regulate the biomass production and protein accumulation of microalgae is mostly unknown. In this study, the influence of different light conditions, including light colors, densities, and light:dark cycles on the cell growth and biochemical composition of Spirulina platensis was symmetrically characterized. Under different colored lights, S. platensis all shows an incr...  相似文献   

A Method for Reducing Ocean Wave-Induced Magnetic Noises in Shallow-Water MT Data Using a Complex Adaptive Filter     

WU Yunju  LUO Ming  LI Yuguo  GE Jiaqi  PAN Lindong 《中国海洋大学学报(英文版)》2023,(1):99-106

In shallow-water areas, the marine magnetotelluric(MT) method faces a challenge in the investigation of seabed conductivity structures due to electrical and magnetic noises induced by ocean waves, which seriously contaminate MT data. Ocean waves can affect electric and magnetic fields to different extents. In general, their influence on magnetic fields is considerably greater than that on electric fields. In this paper, a complex adaptive filter is adopted to reduce wave-induced magnetic noises ...  相似文献   

Spatial and temporal variations of sedimented organic matter in Xiaohai Lagoon, Hainan Island   总被引：1，自引：1，他引：0  

LIU Xingjian  GE Chendong 《海洋学报(英文版)》2012,31(3):74-86

The characteristics of grain-size,total organic carbon(TOC) and total nitrogen(TN) contents,TOC/TN ratios,stable carbon isotope(δ13C) and 210 Pb dating were measured in six sediment cores from the Xiaohai Lagoon.The results show distinct spatial and temporal variations in sedimentation patterns.The sediments are dominated by clayey silt,sandy silt and by silty sand in the southern,middle lagoon and the northern lagoon,respectively.TOC and TN contents decline from south to north.Sedimentation rates,determined by 210 Pb dating,tend to decrease from south to middle.However,the determination of sedimentation rate in the north is difficult.These spatial variations are related to the variations in sediment sources and hydrodynamic conditions in the Xiaohai Lagoon.The variations of organic matter signatures can be divided into two stages in the cores from the southern and middle lagoon.Before 1988,the organic matter signatures are relatively stable.The contribution of terrestrial organic carbon sources varies between 60% and 85%.After 1988,the organic matter signatures demonstrate significant variations.TOC and TN contents increase rapidly,TOC/TN ratios decrease,δ13C values shift to higher and the contribution of terrestrial organic carbon sources decreases to 40%-50%.The contributions of phytoplankton organic matter have increased in the sediment since 1988.Increasing aquaculture activities have had a significant impact on organic matter signatures since 1988.The sedimentation rates have increased rapidly in the southern and middle lagoon since 1988 due to the anthropogenic activities which include aquaculture,mining and deforestation.These activities have caused eutrophication and increased siltation in the southern and middle lagoon.  相似文献