The Qilian Shan forms the northeastern margin of the Qinghai\|Xizang (Tibet) Plateau, and is a region of marked relief (reaching elevations in excess of 5000m), reflecting the significant crustal shortening and uplift...The Qilian Shan forms the northeastern margin of the Qinghai\|Xizang (Tibet) Plateau, and is a region of marked relief (reaching elevations in excess of 5000m), reflecting the significant crustal shortening and uplift which has occurred during the Late Cenozoic. Its foreland margins define the Hexi Corridor, which constitutes a series of small sedimentary basins, accommodating thick sequences of Late Cenozoic alluvial sediments. The overall alluvial depositional pattern follows that expected in a foreland basin, where the thickness of the alluvial accumulations relates to thrust emplacement. The Late Cenozoic alluvial associations exhibit striking differences in style: (1) Miocene \| isolated, sheet channels with relatively fine\|textured sediments, set in thick floodplain sequences; (2) Pliocene \| large, strongly crossbedded, multistoreyed channel arrangements, containing coarse to pebbly\|sand with minor conglomerates, set in significant floodplain accumulations, and with sediment coarsening and increasing channel density in the later Pliocene; (3) Quaternary \| thick, monotonous sheet and channel coarse gravel sequences. While some uncertainty remains as to the absolute ages of the sediments (age estimates based on biostratigraphy, paleomagnetics and luminescence techniques), it is clear that the change to strong gravel deposition was a feature of the late Pliocene\|early Pleistocene. Accompanying changes in alluvial style were a reorganization in drainage, with more axial flow directions (Miocene\|Pliocene) becoming progressively more transverse (late Pliocene\|Pleistocene). The alluvial evidence suggests that the onset of significant uplift in the Qilian Shan occurred prior to the Gauss\|Matuyama transition. Additional evidence for such a claim is provided by: (1) paleosols associated with the alluvial sequences; and (2) details of the structural geology. The conclusion reached is that strong tectonic deformation occurred over a relatively restricted time interval during the late Pliocene\|early Pleistocene, possibly persisting into the middle Pleistocene, but with only limited def ormation during the Late Quaternary.展开更多
目的利用文献计量方法,梳理国际蜂针疗法研究的概况、展现研究热点及趋势。方法以Web of Science为数据源,检索得到蜂针疗法文献347篇,运用VOSviewer、CiteSpace和Alluvial Generator生成研究机构、作者、知识基础、标志性文献、热点及...目的利用文献计量方法,梳理国际蜂针疗法研究的概况、展现研究热点及趋势。方法以Web of Science为数据源,检索得到蜂针疗法文献347篇,运用VOSviewer、CiteSpace和Alluvial Generator生成研究机构、作者、知识基础、标志性文献、热点及趋势知识图谱,进行分析。结果16所高发文机构中,12所来自于韩国,韩国学者成果突出;蜂毒与针刺作用机制、活体功效性试验及过敏反应应对是该疗法的四个研究维度;蜂毒肽与针灸协同治疗类风湿性关节炎(RA)及其引发的病理性疼痛、蜂毒肽诱导癌细胞凋亡机制和膜翅目毒液免疫疗法(VIT)是该论题研究热点;治疗帕金森病与不同类型癌症或将成为研究趋势。结论加强与韩国高产科研机构及作者的合作、熟练掌握现代科学技术、把握研究热点及趋势,对我国蜂针疗法创新性研究大有裨益。展开更多
Paleogene sedimentary basins exposed across much of the central and eastern Tibetan Plateau may record the early history of plateau uplift related to the Indo\|Asian collision. We conducted sedimentological and strati...Paleogene sedimentary basins exposed across much of the central and eastern Tibetan Plateau may record the early history of plateau uplift related to the Indo\|Asian collision. We conducted sedimentological and stratigraphic investigations in the northeastern Qiangtang terrane, eastern Tibetan Plateau. Our results indicate development of several nonmarine basins during Paleogene(?) time, probably synchronous with northeast\|southwest contractional deformation. The Nangqian and Xialaxiu basins (96°～97°E, 32°～33°N) are composed of 500～ 20000m thick successions of primarily clastic sediment indicative of lacustrine and alluvial\|fan depositional processes. Paleocurrent measurements and sediment compositional data indicate local sediment source areas composed of Carboniferous\|Triassic carbonate and sandstone and minor Tertiary volcanic rocks. The large variability of provenance and facies types suggest that each basin evolved independently, as opposed to regional development of a single integrated basin which was partitioned by later deformation.展开更多
The extensive distribution of coarse-grained clastic rock of Guantao formation in Shuyi area of Liaohe basin was considered as a result of fluvial deposit. According to the comprehensive analysis of seism data, well l...The extensive distribution of coarse-grained clastic rock of Guantao formation in Shuyi area of Liaohe basin was considered as a result of fluvial deposit. According to the comprehensive analysis of seism data, well log, core observation and experimental data, this kind of clastic rock is composed of pebblestone-cobblestone, microconglomerate, sand conglomerate, medium-coarse grained sandstone and fine-sandstone. According to the clast composition, sedimentary texture, structure and rock type, 3 kinds of sediment facies can be recognized ie the mixed accumulation-conglomerate dominated debris flow, pebblestone-cobblestone dominated gradient flow and sandstone dominated braided stream. Vertically, the bottom gradient current deposit and top braided stream deposit form fining-upward sediment sequence, and the debris flow deposit distributes in them at random. The sedimentary feature of coarse grain clastic of Guantao formation in Shuyi area is accordant with proximal wet alluvial fan deposited in wet climate at foreland and this kind of alluvial fan is different from the traditional one.展开更多
文摘The Qilian Shan forms the northeastern margin of the Qinghai\|Xizang (Tibet) Plateau, and is a region of marked relief (reaching elevations in excess of 5000m), reflecting the significant crustal shortening and uplift which has occurred during the Late Cenozoic. Its foreland margins define the Hexi Corridor, which constitutes a series of small sedimentary basins, accommodating thick sequences of Late Cenozoic alluvial sediments. The overall alluvial depositional pattern follows that expected in a foreland basin, where the thickness of the alluvial accumulations relates to thrust emplacement. The Late Cenozoic alluvial associations exhibit striking differences in style: (1) Miocene \| isolated, sheet channels with relatively fine\|textured sediments, set in thick floodplain sequences; (2) Pliocene \| large, strongly crossbedded, multistoreyed channel arrangements, containing coarse to pebbly\|sand with minor conglomerates, set in significant floodplain accumulations, and with sediment coarsening and increasing channel density in the later Pliocene; (3) Quaternary \| thick, monotonous sheet and channel coarse gravel sequences. While some uncertainty remains as to the absolute ages of the sediments (age estimates based on biostratigraphy, paleomagnetics and luminescence techniques), it is clear that the change to strong gravel deposition was a feature of the late Pliocene\|early Pleistocene. Accompanying changes in alluvial style were a reorganization in drainage, with more axial flow directions (Miocene\|Pliocene) becoming progressively more transverse (late Pliocene\|Pleistocene). The alluvial evidence suggests that the onset of significant uplift in the Qilian Shan occurred prior to the Gauss\|Matuyama transition. Additional evidence for such a claim is provided by: (1) paleosols associated with the alluvial sequences; and (2) details of the structural geology. The conclusion reached is that strong tectonic deformation occurred over a relatively restricted time interval during the late Pliocene\|early Pleistocene, possibly persisting into the middle Pleistocene, but with only limited def ormation during the Late Quaternary.
文摘目的利用文献计量方法,梳理国际蜂针疗法研究的概况、展现研究热点及趋势。方法以Web of Science为数据源,检索得到蜂针疗法文献347篇,运用VOSviewer、CiteSpace和Alluvial Generator生成研究机构、作者、知识基础、标志性文献、热点及趋势知识图谱,进行分析。结果16所高发文机构中,12所来自于韩国,韩国学者成果突出;蜂毒与针刺作用机制、活体功效性试验及过敏反应应对是该疗法的四个研究维度;蜂毒肽与针灸协同治疗类风湿性关节炎(RA)及其引发的病理性疼痛、蜂毒肽诱导癌细胞凋亡机制和膜翅目毒液免疫疗法(VIT)是该论题研究热点;治疗帕金森病与不同类型癌症或将成为研究趋势。结论加强与韩国高产科研机构及作者的合作、熟练掌握现代科学技术、把握研究热点及趋势,对我国蜂针疗法创新性研究大有裨益。
文摘Paleogene sedimentary basins exposed across much of the central and eastern Tibetan Plateau may record the early history of plateau uplift related to the Indo\|Asian collision. We conducted sedimentological and stratigraphic investigations in the northeastern Qiangtang terrane, eastern Tibetan Plateau. Our results indicate development of several nonmarine basins during Paleogene(?) time, probably synchronous with northeast\|southwest contractional deformation. The Nangqian and Xialaxiu basins (96°～97°E, 32°～33°N) are composed of 500～ 20000m thick successions of primarily clastic sediment indicative of lacustrine and alluvial\|fan depositional processes. Paleocurrent measurements and sediment compositional data indicate local sediment source areas composed of Carboniferous\|Triassic carbonate and sandstone and minor Tertiary volcanic rocks. The large variability of provenance and facies types suggest that each basin evolved independently, as opposed to regional development of a single integrated basin which was partitioned by later deformation.
基金Project(99 07) supported by the China Petroleum Chemical Corporation Innovation Fund for Young Scholars
文摘The extensive distribution of coarse-grained clastic rock of Guantao formation in Shuyi area of Liaohe basin was considered as a result of fluvial deposit. According to the comprehensive analysis of seism data, well log, core observation and experimental data, this kind of clastic rock is composed of pebblestone-cobblestone, microconglomerate, sand conglomerate, medium-coarse grained sandstone and fine-sandstone. According to the clast composition, sedimentary texture, structure and rock type, 3 kinds of sediment facies can be recognized ie the mixed accumulation-conglomerate dominated debris flow, pebblestone-cobblestone dominated gradient flow and sandstone dominated braided stream. Vertically, the bottom gradient current deposit and top braided stream deposit form fining-upward sediment sequence, and the debris flow deposit distributes in them at random. The sedimentary feature of coarse grain clastic of Guantao formation in Shuyi area is accordant with proximal wet alluvial fan deposited in wet climate at foreland and this kind of alluvial fan is different from the traditional one.
