东秦岭商丹地区富铷花岗伟晶岩脉矿化特征及其地质意义     

朱伟鹏  宋公社  许锋  杨文博  吴鹏 《地质科技情报》2022,41(3):54-67

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南海北部琼东南盆地第四系陆架边缘轨迹迁移及深水沉积模式     

马畅  葛家旺  赵晓明  廖晋  姚哲  朱继田  方小宇  向柱 《地学前缘》2022,29(4):55-72

陆架边缘迁移轨迹综合受控于构造、物源、海平面和气候等多种因素,其迁移演化与深水沉积体系发育关系密切。陆架边缘迁移规律及沉积物输送体制与深水砂体预测是当前国际地学领域的热点议题。本文通过基于琼东南盆地新采集的高精度地震资料,定量表征了第四系陆架边缘轨迹,识别了低角度缓慢上升型、中等角度上升型和高角度急剧上升型等3类陆架边缘轨迹类型。2.4 Ma以来,陆架边缘轨迹时空演化可分为3个阶段且具有侧向差异性:2.4~1.9 Ma以低角度缓慢上升型为主,1.9~0.8 Ma西北部以低角度缓慢上升型为主,东北部则以中等角度上升型为主,0.8 Ma至今西北部以中等角度上升型为主,东北部以高角度急剧上升型为主。琼东南盆地第四系陆架边缘迁移轨迹研究表明:当陆架边缘轨迹角0°<α<4°时,陆坡区峡谷规模较小且下切浅,深海平原区发育多期大型海底扇沉积,块体搬运沉积(MTDs)较少;当4°<α<35°时,陆坡区峡谷规模有所增加,深海平原区海底扇沉积与块体搬运沉积均有出现;当35°<α<90°时,陆坡区峡谷发育较少但下切深,深水平原区沉积以大型块体搬运沉积为主,海底扇几乎不发育。琼东南盆地更新世以来气温不断下降,以及东亚冬季风的显著增强,物源供给增强加之海平面的下降进而导致了西北部陆架边缘表现为进积特征;研究区东北部的断裂活动频繁以及物源供给弱,导致了研究区东北部陆坡推进距离远远小于研究区西北部且发育多期次块体搬运沉积物。以上认识对南海北部陆架边缘体系及深水扇预测具有一定的理论意义。  相似文献   

Threat from above! Assessing the risk from the Tonghua high-locality landslide in Sichuan,China     

Wang  Dongpo  Li  Yizhi  Wang  Zhongwen  Yang  Weibin  Ouyang  Chaojun  Zhu  Xing  Scaringi  Gianvito 《Landslides》2022,19(3):731-746

Landslides - In tectonically active steep mountain belts, such as those in west Sichuan in China, frequent landslide disasters can occur during the rainy season. High-locality landslides often...  相似文献   

Guocun landslide in a slate slope with dip structure on 27 March 2021 in Tonglu County,Zhejiang Province,China     

Wang  Fawu  Zhao  Zixin  Chen  Ye  Zhu  Guolong  Nam  Kounghoon  Ye  Zhenhua 《Landslides》2022,19(6):1435-1447

On 27 March 2021, a landslide with a volume of approximately 2?×?10⁴ m³ occurred in Guocun Village next to Kengheng road in Tonglu County, Zhejiang Province, China. The landslide caused no casualties as a result of timely road closures, because of the unusual noises detected early by local residents. The motion mechanism of the landslide was studied using video analysis. Slope cutting resulting from road construction might have been the major triggering factor for the landslide. The intrusion of magma and the uplift process of Huangshan led to the metamorphism of mudstone to easily fractured slate, and the brittle layered slate might have controlled the change of motion from transitional sliding to dry debris flow.

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Exploring efficiency of biochar in enhancing water retention in soils with varying grain size distributions using ANN technique     

Garg  Ankit  Wani  Insha  Zhu  Honghu  Kushvaha  Vinod 《Acta Geotechnica》2022,17(4):1315-1326

Acta Geotechnica - Recently, incentives have been provided in many countries, including Canada and Denmark, to produce biochar for construction usage. This is done because biochar is carbon...  相似文献   

Predicting tunnel squeezing using support vector machine optimized by whale optimization algorithm     

Zhou  Jian  Zhu  Shuangli  Qiu  Yingui  Armaghani  Danial Jahed  Zhou  Annan  Yong  Weixun 《Acta Geotechnica》2022,17(4):1343-1366

Acta Geotechnica - The squeezing behavior of surrounding rock can be described as the time-dependent large deformation during tunnel excavation, which appears in special geological conditions, such...  相似文献   

Fractional derivative modelling for rheological consolidation of multilayered soil under time-dependent loadings and continuous permeable boundary conditions     

Ding  Pan  Xu  Riqing  Zhu  Yihong  Wen  Minjie 《Acta Geotechnica》2022,17(6):2287-2304

Acta Geotechnica - This paper investigates the one-dimensional rheological consolidation problem of multilayered soils subjected to different time-dependent loadings and continuous permeable...  相似文献   

A unified constitutive model for cemented/non-cemented soils under monotonic and cyclic loading     

Lu  Yong  Zhu  Wen-xuan  Ye  Guan-lin  Zhang  Feng 《Acta Geotechnica》2022,17(6):2173-2191

Acta Geotechnica - In this paper, an elastoplastic constitutive model is proposed to uniformly describe the mechanical behavior of cemented/ non-cemented soil under different loading conditions. A...  相似文献   

Evolution of the freeze-thaw cycles in the source region of the Yellow River under the influence of climate change and its hydrological effects          下载免费PDF全文

Liang Zhu  Ming-nan Yang  Jing-tao Liu  Yu-xi Zhang  Xi Chen  Bing Zhou 《地下水科学与工程》2022,10(4):322-334

As an important water source and ecological barrier in the Yellow River Basin, the source region of the Yellow River (above the Huangheyan Hydrologic Station) presents a remarkable permafrost degradation trend due to climate change. Therefore, scientific understanding the effects of permafrost degradation on runoff variations is of great significance for the water resource and ecological protection in the Yellow River Basin. In this paper, we studied the mechanism and extent of the effect of degrading permafrost on surface flow in the source region of the Yellow River based on the monitoring data of temperature and moisture content of permafrost in 2013–2019 and the runoff data in 1960–2019. The following results have been found. From 2013 to 2019, the geotemperature of the monitoring sections at depths of 0–2.4 m increased by 0.16°C/a on average. With an increase in the thawing depth of the permafrost, the underground water storage space also increased, and the depth of water level above the frozen layer at the monitoring points decreased from above 1.2 m to 1.2–2 m. 64.7% of the average multiyear groundwater was recharged by runoff, in which meltwater from the permafrost accounted for 10.3%. Compared to 1960-1965, the runoff depth in the surface thawing period (from May to October) and the freezing period (from November to April) decreased by 1.5 mm and 1.2 mm, respectively during 1992–1997, accounting for 4.2% and 3.4% of the average annual runoff depth, respectively. Most specifically, the decrease in the runoff depth was primarily reflected in the decreased runoff from August to December. The permafrost degradation affects the runoff within a year by changing the runoff generation, concentration characteristics and the melt water quantity from permafrost, decreasing the runoff at the later stage of the permafrost thawing. However, the permafrost degradation has limited impacts on annual runoff and does not dominate the runoff changes in the source region of the Yellow River in the longterm.  相似文献   

Variations of methane stable isotopic values from an Alpine peatland on the eastern Qinghai-Tibetan Plateau     

Guo  Qian  Peng  Haijun  Hong  Bing  Yao  Hu  Zhu  Yongxuan  Ding  Hanwei  An  Ning  Hong  Yetang 《中国地球化学学报》2021,40(4):473-483

Acta Geochimica - Isotopic signature is a powerful tool to discriminate methane (CH4) source types and constrain regional and global scale CH4 budgets. Peatlands on the Qinghai-Tibetan Plateau are...  相似文献