柴北缘锡铁山两类榴辉岩的退变质过程 及其对俯冲带折返机制的制约   总被引：1，自引：1，他引：0  

张聪  田作林  张立飞  黄杰  陈梅 《地质通报》2013,32(12):2044-2054

榴辉岩作为俯冲带中重要的岩石类型保存有丰富的地球动力学信息。对榴辉岩及其退变质岩石的研究有助于建立俯冲带演化的p-T轨迹,了解俯冲岩石在折返过程中温压条件及矿物相的变化,从而对俯冲带折返的动力学机制进行限定。对柴北缘锡铁山双矿物榴辉岩及含多硅白云母榴辉岩进行了详细的岩石学研究。在NC（K）FMASH体系中对两类榴辉岩进行变质相平衡模拟,得到双矿物榴辉岩的峰期温压条件为745~790℃,大于2.8~3.0GPa（M1）,后经历等温降压过程达到角闪石榴辉岩岩相（670~770℃,1.6~2.2GPa,M2）,与含多硅白云母榴辉岩经历了相同的折返过程。锡铁山双矿物榴辉岩的原岩具有N-MORB的地球化学特征,而含多硅白云母榴辉岩则显示E-MORB或者OIB特征,二者原岩成分存在明显差异。两类榴辉岩的p-T演化过程和地球化学特征表明,锡铁山双矿物榴辉岩与含多硅白云母榴辉岩矿物学特征的差异是其原岩的多源性造成的,而与俯冲后折返过程中的退变质作用无必然联系。  相似文献   

天津市蓟县系雾迷山组热储层水位动态变化及趋势预测研究     

李俊峰  贾志  张芬娜  田光辉  靳宝珍  刘东林 《华北地质》2013,(3)

通过对天津市蓟县系雾迷山组热储层地下水位动态规律的分析,利用LUMPFIT软件预测了在不同开采量下未来水位的变化规律。结果表明,水位呈逐年下降的趋势,但由于回灌量的增加,水位下降速率明显减小。  相似文献   

四川盆地蜀南地区上三叠统须家河组低孔低渗储层特征及形成机理   总被引：2，自引：1，他引：1  

祝海华  钟大康  李其荣  杜本强  隆辉  马彦良  吴连波  姜楠 《沉积学报》2013,31(1):167-175

蜀南地区须家河组为一套辫状河三角洲平原分支河道沉积的岩屑砂岩、长石岩屑质石英砂岩和岩屑质石英砂岩。埋藏深度变化较大（0～2 673 m）,大部分埋深800～2 000 m,平均孔隙度4.64%,平均渗透率0.147×10-3μm2,属于低孔低渗储层。造成低孔低渗的主要原因是:（1）在构造背景上,须家河组沉积时研究区靠近刚由海变陆而隆升的物源区,沉积物搬运距离较短,分异程度低,大量的泥岩、千枚岩等塑性岩屑及杂基被保存下来,同时碎屑颗粒分选磨圆程度较差,均不利于原生孔隙的形成;（2）在沉积条件上,由于辫状河河道水动力不稳定,侧向改道迅速,早期泥岩易被冲蚀,导致砂泥混杂,砂岩中含较多杂基,堵塞充填原始孔隙;（3）早期持续快速的埋藏过程,压实作用强烈,岩屑压实变形被挤入粒间孔隙中,同时普遍发育的石英次生加大使得砂岩越发致密,孔隙消失殆尽。（4）研究区须家河组远离沉积中心,缺乏烃源岩成熟产生的酸性流体溶蚀改造,导致次生孔隙不发育。  相似文献   

高放废物地质处置岩体工程质量评价系统开发与应用     

宗自华  田霄  王锡勇  李亚伟  陈亮  苏锐  王驹 《铀矿地质》2013,(5):315-320

从岩体工程质量评价理论和技术方法出发,结合我国高放废物地质处置工程特点,建立了高放废物地质处置岩体工程质量评价系统,初步实现了信息存储与调用、数据录入与校正,以及岩体工程质量评价等功能,并对北山预选区BS15号钻孔数据进行了初步分析与评价。研究结果表明,该系统具有良好的工程应用前景。  相似文献   

流域非点源磷素输出负荷估算方法研究   总被引：2，自引：1，他引：1       下载免费PDF全文

张丽  邹鹰  陆海明  张鸿  彭辉  田英 《水文》2013,33(6):11-15

目前水质常规监测频率较低,难以客观反映流域非点源污染物浓度随降雨径流过程的变化情况,结果会低估了流域非点源污染物的输出负荷。本文利用流域次降雨过程的连续水质水量同步监测资料,研究分析次降雨过程与流域非点源磷素输出负荷之间的因果关系,并建立次降雨总量与磷素输出负荷的定量相关关系。研究结果表明,流域次降雨总量与非点源磷素输出负荷之间存在较好的相关关系。通过这种定量关系,以流域次降雨总量为输入,可以更为合理地估算出流域非点源磷素输出负荷。  相似文献   

回填块石土强夯施工工艺的确定及设计优化          下载免费PDF全文

孟宪中  胡先法  王峰  田新元  王中文  王宏沛 《探矿工程》2013,40(11):61-67

以华能莱芜电厂百万机组“上大压小”扩建工程填方区回填块石土强夯地基处理试夯试验为例,比对2个试夯分区采用不同施工工艺施工的质量差别及处理效果,据此查明强夯法的施工质量,确定强夯有效加固深度、土的密实度、变形参数和地基承载力等。根据场地夯填厚度,选取合适的虚填厚度及相应的施工工艺,确定最终施工方案,进一步提高强夯地基处理效果,为最终确定大面积施工所采用的施工工艺提供依据。  相似文献   

基于年龄测试的黄庄—高丽营断裂活动性研究     

王海刚  贾三满  田芳 《城市地质》2013,8(1):32-34

黄庄—高丽营断裂是北京平原区一条重要的活动断裂,在庙城—高丽营段沿线发生地裂缝,造成大量房屋墙体开裂和道路破坏。在西王路村探槽揭示该断裂错断第四系地层,产生地表地裂缝。探糟断裂孢粉年龄测试,该断裂发生年龄大致在13～22ka,仍处于活动状态。  相似文献   

Fault-Growth Pattern of the South Margin Normal Fault of the Yuguang Basin in Northwest Beijing and its Influencing Factors   总被引：4，自引：0，他引：4  

WANG Lin  TIAN Qinjian  LI Dewen  ZHANG Xiaoliang 《《地质学报》英文版》2013,87(3):707-719

Based on high-resolution remote sensing image interpretation, digital elevation model 3-D analysis, field geologic field investigation, trenching engineering, and ground-penetrating radar, synthetic research on the evolution of the Yuguang Basin South Margin Fault (YBSMF) in northwest Beijing was carried out. We found that the propagation and growth of faults most often occurred often at two locations: the fault overlapping zone and the uneven or rough fault segment. Through detailed observation and analysis of all cropouts of faults along the YBSMF from zone a to zone i, we identified three major factors that dominate or affect fault propagation and growth. First, the irregularity of fault geometry determine the propagation and growth of the fault, and therefore, the faults always propagate and grow at such irregular fault segments. The fault finally cuts off and eliminates its irregularity, making the fault geometry and fault plane smoother than before, which contributes to the slipping movement of the half-graben block in the basin. Second, the scale of the irregularity of the fault geometry affects the result of fault propagation and growth, that is, the degree of the cutting off of fault irregularity. The degree of cutting off decreases as irregularity scale increases. Third, the maximum possible slip displacement of the fault segment influences the duration of fault propagation and growth. The duration at the central segments with a large slip displacement is longer than that at the end segments with a smaller slippage value.  相似文献   

Tectonic Taphrogenesis and Paleoseismic Records from the Yishu Fault Zone in the Initial Stage of the Caledonian Movement   总被引：3，自引：0，他引：3  

TIAN Hongshui  ZHANG Zengqi  ZHANG Banghu  ZHU Jiewang  SANG Zhongxi  LI Hongkui 《《地质学报》英文版》2013,87(4):936-947

The Yishu fault zone (mid-segment of the Tanlu fault zone) was formed in the Presinian. Periodic tectonic activities and strong seismic events have occurred along the fault zone. During the initial stage of the Caledonian Movement, with the proceeding of the marine transgression from the Yishu paleo-channel to the western Shandong, uneven thick sediments, composed mainly of sand, mud and carbonates of littoral, lagoon, and neritic facies, were deposited in the Yishu fault zone and western Shandong, and constructed the bottom part of the Lower Cambrian consisting of the Liguan and Zhushadong formations. Through field observations and the lab-examinations, various paleoseismic records have been discovered in the Liguan Formation and the Zhushadong Formations of the Yishu fault zone and its vicinity, including some layers with syn-sedimentary deformation structures that were triggered by strong earthquakes (i.e. seismite, seismo-olistostrome, and seismo-turbidite). Paleoseismic records developed in the Zhushadong Formation are mainly seismites with soft-sediment deformation structures, such as liquefied diapir, small liquefied-carbonate lime-mud volcano, liquefied vein, liquefied breccia, convolute deformation (seismic fold), graded fault, soft siliceous vein, and deformation stromatolite, as well as seismites with brittle deformation structures of semiconsolidated sediments. Paleoseismic records preserved in the Liguan Formation are not only seismo-olistostrome with a slump fold, load structure, and ball-and-pillows, but also seismo-turbidite with convolution bedding, graded bedding and wavy-bedding. However, in the western Shandong area, the closer to the Yishu fault zone, the greater the thickness of the Liguan Formation and the Zhushadong Formation, the greater the number and type of layers with paleoseismic records, and the higher the earthquake intensity reflected by associations of seismic records. This evidence indicates that tectonic taphrogenesis accompanied by strong earthquake events occurred in the Yishu fault zone during the initial stage of the Caledonian Movement, which embodied the break-up of the Sino-Korean Plate along the Paleo-Tanlu fault zone at that time.  相似文献   

Macrofossils from the Permian-Triassic Boundary Strata at Mingtang Section in the Great Bank of Guizhou, Southwest China     

LIANG Lei  TONG Jinnan  SONG Haijun  TIAN Li 《《地质学报》英文版》2013,87(Z1):905-907

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