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993.
Chunming Shi Valérie Masson-Delmotte Camille Risi Thomas Eglin Michel Stievenard Monique Pierre Xiaochun Wang Jing Gao François-Marie Bréon Qi-Bin Zhang Valérie Daux 《Earth and Planetary Science Letters》2011,301(1-2):307-316
We explore the potential of tree-ring cellulose δ18O and δ13C records for reconstructing climate variability in the southeast Tibetan Plateau. Our sampling strategy was designed to investigate intra and inter-tree variability, and the effects of the age of tree on δ18O variation. We show that intra-tree δ13C and δ18O variability is negligible, and inter-tree coherence is sufficient to build robust tree-ring δ18O or δ13C chronologies based on only four trees. There is no evidence of an age effect regarding δ18O, in contrast with tree-ring width. In our warm and moist sampling site, young tree δ13C is not clearly correlated with monthly mean meteorological data. Tree-ring δ18O appears significantly anti-correlated with summer precipitation amount, regional cloud cover, and relative humidity. Simulations conducted with the ORCHIDEE land surface model confirm the observed contribution of relative humidity to tree cellulose δ18O, and explain the weak correlation of δ13C with climate by the non-linear integration linked with photosynthesis. Altogether, the tree-ring cellulose δ18O is shown to be a promising proxy to reconstruct regional summer moisture variability prior to the instrumental period. 相似文献
994.
大杨树盆地岩性复杂,储层含有大量孔隙及裂缝,但是在该区油气并没有取得重大突破,因此勘探方向成为研究区的重要问题。这里利用杨参1井测井数据计算了含气层位的阻抗,分析判断该含气层位AVO异常为第一类AVO异常。运用AVO分析软件处理杨参1井所在74号线的叠前道集资料,发现该含气层位AVO异常振幅为第一类AVO异常。运用AVO技术分析认为,杨参1井两侧存在范围较大的含气异常,而且存在含气性更好的第二类AVO异常特征。最后综合各类资料,认为74号线位于大杨树盆地南部坳陷最有利的勘探远景区,AVO异常特征段为下一步重点工作的地区,作为探井位置CDP3010附近应引起重视。 相似文献
995.
Jin Liu Bin Shi Hongtao Jiang He Huang Gonghui Wang Toshitaka Kamai 《Engineering Geology》2011,117(1-2):114-120
The topsoil of clayey slope is easy to erosion because it is weak in its strength, water stability and erosion resistance. A new organic polymer soil stabilizer, which was developed for the stabilization treatment of clay slope topsoil and was named as STW, was introduced in this study. In order to understand the effect of STW on the stabilization of clayey soil, laboratory tests on the unconfined compressive strength, shear strength, water stability and erosion resistance of untreated and treated soil specimens are performed, The results indicated that STW soil stabilizer can significantly increased the unconfined compression strength, shear strength, water stability and erosion resistance of clayey soil. The unconfined compression strength increased with the increasing of curing time and the variation mainly occurs in the first 24-hour. With the addition amounts of STW increasing, the strength, water stability and erosion resistance increased at the curing time being 48 h, but in the case of friction angle, no major change was observed. Based on the scanning electron microscopy (SEM) analysis of the stabilized soil, the stabilization mechanisms of STW soil stabilizer in the clayey soil were discussed. Finally, a field test of the stabilization treatment of clay slope topsoil with STW was carried out, and the results indicated that the STW soil stabilizer on the stabilization treatment of clay slope topsoil is effective for improving the erosion resistance of slope topsoil, reducing the soil loss and protecting the vegetation growth. Therefore, this technique is worth popularizing for the topsoil protection of clay slope. 相似文献
996.
This work reports the application of thermodynamic models, including equations of state, to binary (salt-free) CH4-H2O fluid inclusions. A general method is presented to calculate the compositions of CH4-H2O inclusions using the phase volume fractions and dissolution temperatures of CH4 hydrate. To calculate the homogenization pressures and isolines of the CH4-H2O inclusions, an improved activity-fugacity model is developed to predict the vapor-liquid phase equilibrium. The phase equilibrium model can predict methane solubility in the liquid phase and water content in the vapor phase from 273 to 623 K and from 1 to 1000 bar (up to 2000 bar for the liquid phase), within or close to experimental uncertainties. Compared to reliable experimental phase equilibrium data, the average deviation of the water content in the vapor phase and methane solubility in the liquid phase is 4.29% and 3.63%, respectively. In the near-critical region, the predicted composition deviations increase to over 10%. The vapor-liquid phase equilibrium model together with the updated volumetric model of homogenous (single-phase) CH4-H2O fluid mixtures (Mao S., Duan Z., Hu J. and Zhang D. (2010) A model for single-phase PVTx properties of CO2-CH4-C2H6-N2-H2O-NaCl fluid mixtures from 273 to 1273 K and from 1 to 5000 bar. Chem. Geol.275, 148-160), is applied to calculate the isolines, homogenization pressures, homogenization volumes, and isochores at specified homogenization temperatures and compositions. Online calculation is on the website: http://www.geochem-model.org/. 相似文献
997.
大塘铅锌矿位于黔东铅锌成矿带中段,区域性施洞口断裂北西侧,矿体及矿化体呈似层状、脉状和透镜状赋存于下寒武统清虚洞组及中寒武统石冷水组地层中,含矿岩系为角砾状白云岩,矿石矿物主要为闪锌矿、方铅矿及少量黄铁矿,脉石矿物主要为白云石及少量方解石。矿石结构以粒状结构和假象结构为主,矿石构造主要为浸染状、细脉状和角砾状构造。该类型铅锌矿矿床有一定的规模,找矿标志明显。黔东铅锌成矿带中段内有铅锌矿点和铅锌地球化学异常区多处,通过了解该类型铅锌矿床地质特征和找矿标志,可望找到更多、更大的铅锌矿。 相似文献
998.
本文对班公湖地区中生代沙木罗组(J3—K1s)和日松组(J3r)地层的碎屑锆石进行了形态学及U-Pb年代学的研究。结果表明:锆石颗粒粒径约为100~150 μm,内部结构清晰,晶体为长柱状,自形程度较高,多数锆石不含暗色包体及浑圆形内核; 有些锆石颗粒有扇型分带结构。Th/U比值较大,多数大于0.1,均值约为0.86,说明岩浆的成因以锆石为主体,部分颗粒或晶体可能为变质成因; 锆石年龄主要分布在6个区间范围内: 1)180~100 Ma, 2)350~180 Ma, 3)600~450 Ma, 4)1100~600 Ma, 5)1800~1400 Ma, 6)2200~1800 Ma。锆石U-Pb年龄谱对应了羌塘地块经历的几次构造热事件,验证了晚侏罗世—早白垩世班公湖地区的物源主要来自其北部的羌塘地块。 相似文献
999.
1000.
浙江跨湖桥遗址位于中国东南沿海,是距今约8000年左右的新石器时代遗址.遗址中出土有大量哺乳动物骨骼,通过显微观测和统计,发现遗址动物骨骼表面有丰富的人工改造痕迹,并有家畜狗的啃咬痕迹等.其中人工改造痕迹的比重,达到所观察标本总数的17.57%.人工改造痕迹的显微特征、排列规律、分布位置等,反映遗址古居民已熟练掌握了剥... 相似文献