Rare earth element signatures of Paleoproterozoic Sallopat phosphorites of Aravalli Basin,India: implications for diagenetic effects and depositional environment

As a repository of REE, the Paleoproterozoic phosphorite of the Aravalli Basin in India is explored time to time. Paleoproterozoic phosphorite deposits of the Sallopat sub-basin Banswara district of the Aravalli Supergroup show moderate REE concentrations much lower than that of average marine phosphorites. Different ratios and PAAS-normalized REE distribution patterns reflect MREE enrichment over LREE and HREE in these phosphorites.MREE enrichment confirmed by(Sm/Yb)Nversus(Sm/Pr)Nrelationship ...     

泥石流沉积及其伴生的插入流沉积

约翰逊(1970)曾建立了泥石流的流动模型,即义底部是层流剪切带,上部是插入流(plug-flow)粗粒带。在此模型中,他提出了泥石流流动在半园形沟道中的设想,因为泥石流、熔岩流和活动性冰川等宾汉流体和假塑性流体的粘滞性常常将原来的 U 形沟道塑造成半园形,此外,半园形沟道还有利于数学模型的建立。本文讨论的泥石流沉积及其伴生的插入流沉积(plug-flow deposits)类似于约翰逊的理想模型,但与该模型并不完全相同。     

Development of a building information model-guided post-earthquake building inspection framework using 3D synthetic environments

Computer vision-based inspection methods show promise for automating post-earthquake building inspections. These methods survey a building with unmanned aerial vehicles and automatically detect damage in the collected images. Nevertheless, assessing the damage′s impact on structural safety requires localizing damage to specific building components with known design and function. This paper proposes a BIM-based automated inspection framework to provide context for visual surveys. A deep learning-...     

加拿大一美国圣劳伦斯河：需要对大河生态系统水平上的了解

Throughout the course of civilization, large rivers have played a major role in transport, water supply and human waste disposal. The pressure on these resources has greatly intensified over this century, but our ecological understanding of this most important class of freshwater environments remains poorly developed.     

比利时北部Campine粘土与砂：与海平面变化相关的沉积作用模式

一个多世纪以来 ,关于比利时Ｃａｍｐｉｎｅ地区北部第四系层序最下部层位一直存有争议。此层位由砂层和粘土质沉积物构成 ,在大部分区域 ,其厚度达４０ｍ以上。研究区位于比利时北部Ａｎｔｗｅｒｐ 省Ｃａｍｐｉｎｅ地区北部 ,北部与荷兰北布拉班特省相邻。荷兰南部和比利时北部第四纪层序以Ｃａｍｐｉｎｅ粘土和砂为主。除了研究区东南部最远端 ,新生界基底为利洛组 ,由灰色和灰褐色含贝壳砂构成。下部为粘土质砂 ,含有几个贝壳层。上部粘土和贝壳含量逐渐减少。在研究区东南部普德尔莱或莫尔组构成了新生界层序的上部。普德尔莱组为含少…     

三水盆地古近系(土布)心组黑色页岩中黄铁矿的形成及其控制因素

黄铁矿是富有机质沉积的特征矿物。根据TOC/S、TOC/DOP、S/Fe关系以及S TOC Fe多重线性回归分析结果对三水盆地古近系〖HT5”,6”〗土〖KG-*3〗布〖HT5”SS〗心组红岗段黑色页岩中沉积黄铁矿的形成及其控制因素进行了分析。土布心组红岗段黑色页岩的黄铁矿有成岩黄铁矿和同生黄铁矿两种成因组分。红岗段下部（亚段A）有机碳含量普遍较低,底部水体以弱氧化条件为主,硫酸盐还原作用发生于沉积物/水界面以下,黄铁矿为成岩成因,其形成主要受有机质的限制。红岗段中上部（亚段B和C）的沉积条件变化频繁,其有机碳含量变化幅度大。富有机质（TOC>4%）岩层形成于缺氧的底部水体条件下。水体中可含H2S,碎屑铁矿物在埋藏之前即与之在水体中反应形成同生黄铁矿。这一过程不受有机质的限制,而是受活性铁与H2S接触时间的限制。同时,由于大量淡水输入导致硫酸盐浓度的降低,从而对硫化物形成有一定的限制作用。对于低有机质（TOC<4%）样品,黄铁矿由同生和成岩组分组成。其中以成岩黄铁矿为主,其形成过程主要受有机质限制,而同生黄铁矿受铁矿物与H2S接触时间的限制。     

3D CFD MODELING OF WATER AND SEDIMENT FLOW IN A HYDROPOWER RESERVOIR

１ＩＮＴＲＯＤＵＣＴＩＯＮＲｅｓｅｒｖｏｉｒｓｅｄｉｍｅｎｔａｔｉｏｎｉｓｒｅｃｏｇｎｉｚｅｄａｓｏｎｅｏｆｔｈｅｍａｉｎｐｒｏｂｌｅｍｓａｆｅｃｔｉｎｇｔｈｅｅｃｏｎｏｍｉｃｓｏｆｍａｎｙｗａｔｅｒｒｅｓｏｕｒｃｅｓｐｒｏｊｅｃｔｓ．Ｍａｎｍａｄ...     

Tidal bedforms in eastern part of the Bohai Sea

ＴｉｄａｌｂｅｄｆｏｒｍｓｉｎｅａｓｔｅｒｎｐａｒｔｏｆｔｈｅＢｏｈａｉＳｅａＬｉｕＺｈｅｎｘｉａ,Ｓ．Ｂｅｒｎｅ,ＷａｎｇＫｕｉｙａｎｇ,Ｔ．Ｍａｒｓｓｅｔ,ＸｉａＤｏｎｇｘｉｎｇ,ＴａｎｇＹｕｘｉａｎｇ,Ｊ．Ｆ．Ｂｏｕｒｉｌｌｅｔ（Ｒｅｃｅｉｖｅ...