( 4 ) by five terraces surrounding the ancient barrier lake , presuming that destroyed process of the ancient barrier lake is at least divided into five phases at the time span of two thousand years to three thousand years , and it reflects the five times flood in the course of the destroying of the ancient barrier lake ( 4 )依据古堰塞湖湖相沉积中存在的五级阶地，说明古堰塞湖至少分为明显的五个阶段突发性消亡的，消亡的平均周期为2 3千年，并且反映了古堰塞湖消亡过程中五次洪水事件的发生。
There are three genetic types of mineral deposits in the beiya ore district : cu - au polymetallic deposits related to alkaline porphyries , comprising porphyritic cu - au deposits and polymetallic skarn deposits related to quartz - albite porphyry and quartz - k - feldspar porphyry ; fe - au deposits related to gabbro or basalt magma , consisting of magmatic fe - au deposits and sedimentary polymetallic deposits formed in caves and lakes ; and palaeo - placers formed at the weathering surface , in lakes and in karsts 北衙金矿有3种成因不同的矿床：与碱性斑岩有关的铜金多金属矿，包括与石英钠长斑岩和石英正长斑岩有关的斑岩型铜金矿床和矽卡岩型多金属矿床；与辉长玄武岩浆有关的铁金矿床，包括熔浆型铁金矿床和喷流沉积型多金属矿床，后者又有洞穴和湖相沉积环境之分；及古砂矿，有古风化壳型砂矿、河湖相古砂矿和洞穴沉积古砂矿。
This paper , based on the grain - size analysis and the comparative result of the mz - o scatter gram of ancient aeolian sands in milanggouwan section with the modern dunes in mu us desert , holds that fossil eolian dunes are a proxy of the dune activation , and be regarded as " desert process " , while the overlying fluvio - lacustrine and palaeosols on the dunes are regarded as inter - desert process 文中根据粒度分析及古今砂丘的mz ?散点图比较结果，认为古代风成砂丘特别是古流动砂丘是砂丘活化的体现，视为“沙漠期” ，而砂丘上覆的河湖相沉积与古土壤发育则可视为“间沙漠期” 。
Based on the treatment engineering of 26 kilometers lacustrine deposits soft soil foundation in han - sha sect of yi - huang freeway , the paper , through the means of centrifugal model test and field observation , establishes mathematical analysis model , completely and detailedly researches and analyses the stability of lacustrine deposits soft soil foundation and the rule of settlement , guides the large - scale construction of yi - huang freeway 26 kilometers soft foundation treatment , educes the settlement characteristic and the rule of lacustrine deposits soft soil subgrade , summarizes the scientific measure of effectively controlling the stability and settlement of such kind of foundation 本文以宜黄高速公路汉沙段中的26公里湖相沉积软土地基的处理工程为依托，通过采用离心模型试验与现场原位监测相结合的手段，建立数学分析模型，对湖相沉积软土地基的稳定性及沉降规律进行了全面、细致的研究与分析，指导了宜黄高速公路26公里软基处理的大规模施工，得出了湖相沉积软土地基路堤沉降特性及规律，提出了有效控制此类地基稳定性及沉降的科学措施。
The border facies did not appear at the south edge of tiaohu seg . in the basin , the braided river facies and braided delta facies were only found at the foot of chahaquan palaeohigh in the west - south edge of the basin , the meandering delta was found from mazhong structural belt to fangfangliang horseback , and the other area were found covered by the shallow and fairly deep lake facies 条湖凹陷南缘芦草沟组未见边缘相沉积；岔哈泉古隆起处见少量辫状河相及辫状河三角洲相沉积；方方梁凸起东部至马中构造带发育曲流河三角洲相；其余地区则均为滨浅?半深湖相沉积。
On the east terrace - fault slope of the depression , the sedimentary mode of fan - shaped delta - slump turbid fan - deep lake facies are developed . on the long axial direction of fula depression , the southeastern groove was filled with a large scale delta which was the main sources , the other little delta limited by the 3 syndepositional fault was distributed down the slope edge of the northern sub - depression . this stage developed a favorable oil sources , reservoir and regional seal which formed the good matching relations of generation , reservoir and seal in the time - space zone Abugarbra组的sc和sd层序发育在边界断层和同沉积断层活动剧烈、湖盆扩张期，凹陷中心发育半深湖-深湖相沉积，在凹陷陡坡发育近岸水下扇，断阶缓坡带发育扇三角洲?滑塌浊积扇?深湖相组合，长轴凹槽和北部次凹的北部缓坡带发育三角洲体系，此层位是有利生油层和岩性圈闭发育层段。
The study solves engineering problem as follows : ( 1 ) the systematic study on the historical course of xigeda strata deposit and geologic environment includes strata , lithologic characters and constitution et in the liangshan and panzhihua region . the results show that the xichang - panzhihua express way is controlled by the anninghe fault and the xigeda fault , the earthquake frequently happen in the region of pass , the different sedimentation number is more great , they effect the road building , safety in operation and structure belong road ( 2 ) because in some place the xigeda strata is foundation and roadbed , the study on the basic properties of the xigeda strata include density , moisture content plastic and liquid limit graduation . the results show that the xigeda strata is deposition in lake , the main component is mudstone and sandstone , the fine particle is main , it has some viscosity , the moisture content of mudstone is different the it of sandstone , the other property are likeness . the xigeda strata has no dilatation on total , some claystone have low and medium dilatation ; ( 3 ) the study on the basic properties of xigeda filler include the composition of matter the biggest standard dry density , , the optimum moisture content the results show that xigeda filler can use as road material , it is well grade filler and admixture filler on essence , its compaction index should change in different place because the property is controlled by mudstone and sandstone that change is great in different place ; ( 4 ) the study on the xigeda filler craft used as express way roadbed , includes suitable thickness , compaction numbers and methods and equipment choice et 公路沿线广泛分布有昔格达地层，昔格达地层能否用作高速公路路基填料，国内没有先例，本论文就是结合导师的科研项目，在非典期间，现场长达5个月的工作，完成了从试验、现场施工工艺到路堤分层沉降监测等工作，是面对生产实际，认识昔格达地层的性质和其作为地基、路基和填料应用中面临的问题进行的研究。主要的研究内容有：对攀西地区地层岩性、构造等地质环境和昔格达地层的沉积历史过程作了系统的分析，研究表明西攀高速公路主要受安宁河断裂和昔格达断裂影响，通过地区地震活动频繁，差异沉降较大，对公路建设、安全运行和沿线构筑物设计有较大影响；由于昔格达地层在有些路段作为地基、有些作为路基，对其基本性质进行了研究：包括天然密度、含水量、塑液限、颗粒级配等指标的试验研究。研究成果表明：昔格达地层为湖相沉积，主要为砂岩和泥岩，它以细粒组为主，同时粘粒的存在，使其具有一定粘性。
