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| 1 | Three-dimensional Evolutionary Models of the Qiongxi Structures,Southwestern Sichuan Basin,China:Evidence from Seismic Interpretation and Geomorphology显示文摘褶层结束是在有压缩性的差错相关的褶层的学习的特色。如此的结束能由于戳差错上的排水量的损失或 / 并且形成一个侧面或倾斜的斜面。因此,高质量的地震数据将明白地帮助定义哪个机制应该为给定的差错相关的褶层的结束负责。在四川盆的 Qiongxi 和 Qiongxinan 结构,中国是拥有在他们之间的北结束和结构的僵绳的自然差错繁殖褶层的例子。合拢 / 指责几何学和沿着罢工排水量变化被工业 3-D 抑制地震体积。我们解释北结束和结构的僵绳附近的褶层的 plunge 由于排水量的损失罢工。与北结束联系的差错几何学变化从一在 Qiongxinan 结构的冠扁平斜面在排水量最大的地方,到简单地 Qiongxi 结构的北尖端附近的一个斜面,没有形成一个侧面或倾斜的斜面。在这研究,我们也使用排水模式,在沿着一个差错的排水量与推进为 Qiongxinan 的侧面的繁殖建议一个模型的持续时间成正比的 Qiongxinan 结构和假设的冠保存的胚胎的结构和 Qiongxi 结构。明确地,我们建议结构首先在易碎的单位以内作为一个孤立的差错斜面开始了。与弄短增加,差错变得以更弱的页岩单位与更低的分队连接创造 hybridized 差错繁殖褶层。我们的模型为 Qiongxinan 和 Qiongxi 结构的侧面的繁殖历史建议可能的解释,并且也提供一条其他的途径给在迟了的新生代在西南的四川盆证实以前的 Pingluoba 结构的活动。 | JIA Qiupeng JIA Dong LUO Liang CHEN Zhuxin LI Yiquan DENG Fei SUN Shengsi LI Haibin | 2009 | Acta Geologica Sinica(English Edition)2009，83，2： | 17 |
| 2 | Elastic and Seismic Properties of Dabie-Sulu Ultrahigh Pressure Metamorphic Rocks显示文摘Lamé modulus(λ) and shear modulus(μ) are among the most important,intrinsic,elastic constants of rocks.Using λ and μ could be much more advantageous than using P-and S-wave velocities(Vp and Vs).Here we quantified these equivalent isotropic elastic moduli for 115 representative rocks from the ultrahigh pressure(UHP) metamorphic terrane of the Dabie-Sulu orogenic belt(China) and their variations with pressure(P),temperature(T),density(ρ),Vp,Vs and mineralogical composition.Both moduli increase nonlinearly and linearly with increasing pressure at low(<200-300 MPa) and high(>200-300 MPa) pressures,respectively.In the regime of high pressures,λ and μ decrease quasi-linearly with increasing temperature with temperature derivatives dλ/dT and dμ/dT generally in the range of -10×10-3 to -1×10-3 GPa/oC.Dehydration of water-bearing minerals such as serpentine in peridotites and chlorite in retrograde eclogites results in an abrupt drop in λ while μ remains almost unchanged.In λ-ρ,μ-ρ and λ-μ plots,the main categories of UHP rocks can be characterized.Serpentinization leads to significant decreases in μ and λ as serpentine has extremely low values of λ,μ and ρ.Eclogites,common mafic rocks(mafic gneiss,metagabbro and amphibolite),and felsic rocks(orthogneiss and paragneiss) have high,moderate and low μ and λ values,respectively.For pyroxenes and olivines,λ increases but μ decreases with increasing Fe/Mg ratios.For plagioclase feldspars,both λ and μ exhibit a significant positive correlation with anorthite content.SiO2-rich felsic rocks and quartzites are deviated remarkably from the general trend lines of the acid-intermediate-mafic rocks in Vs-ρ,μ-ρ,λ-Vp,λ-Vs and μ-λ diagrams because quartz has extremely low λ(~8.1 GPa) and ρ(2.65 g/cm3) but moderate μ(44.4 GPa) values.Increasing the contents of garnet,rutile,ilmenite and magnetite results in a significant increase in the λ and μ values of the UHP metamorphic rocks.However,either λ or μ is insensitive to the compositional variations for pyralspite(pyrope-almandine-spessartine) solution series.The results provide potentially improved constraints on characterization of crustal composition based on the elastic properties of rocks and in situ seismic data from deep continental roots. | WANG Qian JI Shaocheng SUN Shengsi Matthew H.SALISBURY Hartmut KERN | 2012 | Acta Geologica Sinica(English Edition)2012，86，1： | 1 |
| 3 | Down-Regulation of Stromal Caveolin-1 Expression in Esophageal Squamous Cell Carcinoma: A Potent Predictor of Lymph Node Metastases, Early Tumor Recurrence, and Poor Prognosis显示文摘 | Yibin Jia Nana Wang Jianbo Wang Hui Tian Wei Ma Kai Wang Bingxu Tan Guangyu Zhang Shengsi Yang Bing Bai Yufeng Cheng | 2014 | Annals of Surgical Oncology2014，，1： | 1 |
| 4 | Correlations between compressional and shear wave velocities and corresponding Poisson’s ratios for some common rocks and sulfide ores显示文摘 | Qian Wang Shaocheng Ji Shengsi Sun Denis Marcotte | 2009 | Tectonophysics2009，，1： | 1 |
| 5 | Effect of chemical composition on zircon radiation damage dating:Implications for low-temperature thermochronology显示文摘Zircon radiation damage dating is a low-temperature thermochronological method that can reveal the cooling histories of magmatic intrusions and discriminate sedimentary provenance in combination with other dating methods.This method has broad application prospects because of its advantages of nondestructive,high efficiency,and capable of double(or multiple)dating,involving only multiple measurements by Raman spectrometer and laser ablation-inductively coupled plasma-mass spectrometry.However,several factors,such as zircon chemical composition and the non-uniformity of radiation damage annealing kinetics,can cause poor precision when using this method and thus restricts its wide application.This study examined the effect of chemical composition(P,Ti,Dy,Th,U,and Hf)on Raman spectra using synthetic zircon crystals grown in a lithium-molybdate flux.The results show that the full width at half-maximum(FWHM)of the v_(3)(SiO_(4))band has positive linear correlations with the concentrations of P,Ti,Dy,Th,and U in decreasing order of influence,while the FWHM is unaffected by Hf at concentrations<1 wt.%but increases at concentrations>10 wt.%.Furthermore,the Raman shift is negatively correlated with Th,U,and Dy concentrations,positively correlated with Hf,and shows no obvious correlation with Ti and P.Thus,our study shows that chemical composition is a non-ignorable factor for calculating zircon radiation damage age using Raman spectroscopy,especially for zircon with relatively high concentrations of P,rare earth elements(REEs),Th,U,and Hf.The obtained multiple linear regression equation provides a potential means for estimating the FWHM at zero dose and implication for improving the dating precision of this method.In addition,the observed effects of REEs,Th,U,and Hf on the Raman shift of the v_(3)(SiO_(4))band indicate that chemical composition in zircon might affect the estimation of the P-T conditions of geological processes when using entrapped zircon inclusions in host minerals or the field of zircon as an in situ pressure sensor in hydrothermal experiments.Our study suggests that zircon radiation damage dating,excluding geochemical effects,will be more accurate for addressing lower-temperature geological processes. | Mingpu Fan Xiaoming Liu Shengsi Sun Yunpeng Dong John C.Ayers M.Santosh | 2023 | Geoscience Frontiers2023，14，6： | 0 |
| 6 | Rheology of continental lithosphere and seismic anisotropy显示文摘Rheology of rocks controls the deformation of the Earth at various space-time scales,which is crucial to understand the tectonic evolution of continental lithosphere.Researches of rock rheology are mainly conducted via high-pressure and hightemperature rheological experiments and multi-scale observations and measurements of naturally deformed rocks.At present,a large amount of data from such kinds of studies have been accumulated.This paper first provides an up-to-date comprehensive review of the rheological mechanisms,fabric types and seismic properties of the main rock-forming minerals at different depths of continental lithosphere,including olivine,orthopyroxene,clinopyroxene,amphibole,plagioclase,quartz and mica.Then,progress in high-pressure and high-temperature experiments and natural deformation observations is introduced,mainly regarding the rheological strength and behavior,seismic velocity and anisotropy of lithospheric mantle peridotite,eclogite,mafic granulite,amphibolite and felsic rocks.Finally,by taking the Tibetan Plateau as an example,the application of rock rheology for quantitative interpretation of seismic anisotropy data is discussed.The combination of mineral deformation fabrics and seismic anisotropy is expected to make an important breakthrough in understanding the rheological properties and structure of continental lithosphere. | Shengsi SUN Yunpeng DONG Yixi LI Yihai YANG Chao CHENG Bo HUI Bin ZHANG Rutao ZANG | 2024 | Science China Earth Sciences2024，67，1： | 0 |
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