滇西马登地区晚二叠世-早三叠世地层组合及年代学:火山岩锆石U-Pb定年证据   总被引：2，自引：2，他引：0  

唐靓  薛传东  杨天南  梁明娟  向坤  廖程  姜丽莉  信迪 《岩石学报》2016,32(8):2535-2554

在西南"三江"造山带中段的兰坪盆地内,由于露头状况不好,盆地基底岩石出露状况不详,导致地层划分、归属相当混乱。详细的野外地质调查揭示,盆地东缘马登地区出露的基底岩石主要由2个构造地层单元组成,上部为火山-沉积序列,下部为浅海相泥岩、灰岩及生物碎屑灰岩。上部火山-沉积序列出露厚约1200m,可分为4个喷发-沉积韵律,由英安质熔岩、流纹质熔岩与晶屑凝灰岩、火山集块岩、火山角砾岩、流纹质凝灰岩、火山碎屑岩及少量泥岩相间组成。火山岩锆石LAICP-MS U-Pb法测年数据显示,岩浆活动始于250Ma,持续至244Ma,总体处于早三叠世,构成江达-维西-云县弧火山岩带的一部分。强烈变形的海相地层与火山岩二者呈断层接触,其时代老于250Ma。结合砂岩中碎屑锆石年龄结果(大于260Ma)判定,这套沉积岩应属于晚二叠世,其与早三叠世-中三叠世火山岩一起组成兰坪盆地的基底岩石。  相似文献   

基于FLUENT的内孤立波质量源造波方法     

姜海  郭海燕  张林  王伟 《海洋与湖沼》2016,47(6):1101-1106

为研究内孤立波质量源数值造波方法,本文采用两个点源形式的质量源,分别放置于两层流体的上下层中作为内孤立波激发源。推导源项表达式,从不可压缩流体的Navier-Stokes方程出发,结合内孤立波Kd V、e Kd V理论,基于商业软件FLUENT发展了一种内孤立波质量源数值造波方法。通过数值模拟,分析了质量源造波过程中内孤立波的生成过程,并将数值模拟结果同理论及实验作对比。结果表明:基于此方法生成的内孤立波波形、波高及波致水平速度与理论及实验吻合度较好,该方法是可行的,并且耗时短、效率高。  相似文献   

水产动物雷帕霉素受体信号通路的研究进展   总被引：2，自引：0，他引：2  

辛芳  王雷  刘梅  王宝杰  蒋克勇  孙国琼 《海洋科学》2016,40(1):147-154

雷帕霉素受体信号通路(mTOR信号通路)广泛存在于真核生物细胞中,能够接收来自营养素、生长因子或者环境胁迫等的信号,通过调控细胞的合成代谢和分解代谢,实现对细胞生长和生理活动的精确调控。在mTOR信号通路的研究中,水产养殖动物mTOR信号通路的研究仅见于少数几种鱼类、对虾和蟹类,且其研究深度远远落后于模式生物。本文综述了近年来mTOR信号通路的研究进展,包括TOR蛋白的发现与组成,以及参与mTOR信号通路的信号因子和信号通路调控生命过程的机制。同时,本文重点阐述了mTOR信号通路在水产动物细胞中的研究现状,说明了水产动物mTOR信号通路研究的必要性,以期为水产养殖动物mTOR信号通路的进一步研究提供参考。  相似文献   

Production and Certification of Synthetic Selenium Isotopic Reference Materials          下载免费PDF全文

Tongxiang Ren  Jun Wang  Hai Lu  Tao Zhou  Yuanjing Zhou 《Geostandards and Geoanalytical Research》2016,40(2):227-238

Due to intensive research into selenium isotopes in recent years, the increasing requirement for reliable and comparable measurement results has created a strong demand for selenium isotopic certified reference materials (iCRM) that were previously not available. To address this, eleven selenium iCRMs were developed, including ten synthetic iCRMs (GBW 04447–GBW 04456) and one natural iCRM (GBW 04457). The synthetic iCRMs were prepared with ⁷⁶Se, ⁷⁸Se, ⁸⁰Se and ⁸²Se solutions and a natural selenium solution; the natural iCRM was prepared with highly pure selenium material. The property values of isotope ratios in these iCRMs were certified by calibrated mass spectrometry with a collision cell multi‐collector ICP‐MS. The mass discrimination effect of the instrument was corrected with corresponding ⁷⁸Se/⁷⁶Se isotope mixtures and ⁸²Se/⁷⁶Se isotope mixtures, which were gravimetrically prepared with purified, isotopically enriched selenium materials. Homogeneity and stability tests were performed, and no significant influences were found. The uncertainty of the property values of the iCRMs was evaluated according to the Guide to the Expression of Uncertainty in Measurement (GUM) of ISO/BIPM and ISO Guide 35. The δ^82/76Se value of GBW 04457 relative to NIST SRM 3149 was also calculated. These iCRMs are intended for use in calibration of instruments and evaluation of methods for the determination of selenium isotope ratios.  相似文献   

Grain-size distribution and contamination characteristics of heavy metal in street dust of Baotou,China   总被引：1，自引：0，他引：1  

Xiufeng Han  Xinwei Lu  Qinghui Zhang  Wuyuntana  Quansheng Hai  Huiyun Pan 《Environmental Earth Sciences》2016,75(6):468

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Effects of size and strain rate on the mechanical behaviors of rock specimens under uniaxial compression     

Qingbin Meng  Mingwei Zhang  Lijun Han  Hai Pu  Hao Li 《Arabian Journal of Geosciences》2016,9(8):527

Size and strain rate are two key factors that dramatically influence the estimation of rock mechanical behaviors. To better understand the effects of size and strain rate on measured rocks, rock specimens with six different sizes were tested at six different strain rates under uniaxial compression using the MTS 815 Rock Mechanics Test System. Having determined that the size and strain rate significantly affect the peak strain, peak stress, elastic modulus, acoustic emission (AE), and failure pattern of the rock specimens, the relation was established between the strength and the size and strain rate of red sandstone. And the variation was revealed among the size and strain rate, the AE, and the failure pattern. It turned out that the peak stress was negatively correlated with the rock size and was positively correlated with the strain rate. When the length to diameter ratio (L/D) of the rock specimen was less than 2.0, the AE appeared mildly. The AE quantities gradually increased before the peak stress, and then sharply decreased after the peak stress. The failure pattern of the rock specimen was relatively complicated, with a fracture plane appearing along the axial direction. Conical failure type was also presented. When the L/D ratio of the specimen was greater than 2.0, the AE characteristics of red sandstone showed the radical model. There were relatively few AE rings before the peak stress. But the AE rings increased suddenly and dramatically during the peak stress. The rock specimens primarily failed with a single shear plane. Moreover, with an increase in the strain rate, the AE activities were enhanced and the AE quantities increased. When the strain rate of the rock specimen was less than 5.0?×?10^?4/s, the rock specimen failed with a shear or tensile-shear pattern. And when the strain rate was greater than 5.0?×?10^?4/s, the rock specimen tended to fail in a conical pattern.  相似文献   

Structures and properties of Tibetan lithosphere control the India-Asian collision and plateau evolution: Numerical modeling     

Zhong Hai Li  Pengpeng Huangfu 《《地质学报》英文版》2018,92(Z1):77-78

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南海北部潮汕坳陷侏罗系沉积特征及对储层的控制作用研究   总被引：1，自引：1，他引：0       下载免费PDF全文

强昆生  张光学  张莉  吕宝凤  钟广见  冯常茂  易海  赵忠泉  杨振  鄢伟 《中国地质》2018,45(1):48-58

南海北部潮汕坳陷侏罗系具有很大的油气勘探潜力,沉积特征对其储层的发育具有明显的控制作用。通过对研究区最新地震资料精细解释,可以划分出4个典型地震反射界面和3个地震反射层,根据层序界面圈出侏罗系分布特征和残留厚度;通过地震相-沉积相转换对比分析研究,识别出侏罗纪地层不同时期的沉积相类型及其分布特征,重塑了潮汕坳陷侏罗系沉积演化史。该区主要发育5类沉积相、8种沉积亚相,其中滨岸三角洲前缘亚相和深水扇中亚相分别控制了碎屑流砂岩优质储层的发育;此外,浊流砂岩储层主要受控于物源供给的影响,距离三角洲砂体朵叶越近,滑塌浊积体数量越多,面积也越大。总体上,滨岸三角洲前缘亚相、深水扇中亚相和滑塌浊积体是研究区良好的储集相带,该类储集体由于埋藏较深加之被泥岩覆盖,对油气聚集较为有利。  相似文献   

中国航磁大地构造单元划分   总被引：4，自引：3，他引：1       下载免费PDF全文

熊盛青  杨海  丁燕云  李占奎 《中国地质》2018,45(4):658-680

本文以我国截止到2011年基本覆盖陆域及部分海域的航磁数据编制的全国航磁系列图为基础,以航磁反映的区域磁场和磁性基底起伏特征为依据,汲取主流大地构造观的划分理念,以板块构造理论及大陆动力学思想为指导,以磁场反映的构造特征为切入点,结合重力、遥感、地质资料对中国陆域构造单元进行划分。大地构造单元划分4个级别:一级构造单元为陆块区和造山系,共划分出8个;二级构造单元为陆块、弧盆系和地块,共划分出32个;三级构造单元为盆地、坳陷带(区)和隆起带(区),共划分出85个;四级构造单元为隆起和坳陷,共划分出332个。本划分方案旨在为油气地质构造背景研究及油气勘探提供一份地球物理资料。文中重点讨论了一、二级构造单元界线厘定的磁场依据及与前人划分存在的不同之处,而三、四级构造单元完全依据磁场及磁性基底起伏情况进行划分,并在盆地和坳陷区给出了深度信息,这为油气勘探者提供了必要的技术支撑。同时,借助丰富的航磁信息提示出一些地质构造方面难解现象,供同行专家参考与讨论。  相似文献   

冀北滦平盆地九佛堂组—沙海组叶肢介化石的发现与陆相建阶问题的讨论     

牛绍武  辛后田 《地质通报》2018,37(10):1801-1819

2007—2008年,在滦平县西瓜园东滦河南岸发现九佛堂组底部砾岩与西瓜园组连续的直接接触关系,其后,又在滦平以西巴克什营至滦平公路鹞子梁发现九佛堂组底部砾岩鹞子梁砾岩,并向西追索到拉海沟北的得胜岭北山,九佛堂组剖面就是从得胜岭北山鹞子梁砾岩底部开始向北测制。在滦平县以西的山湾、杨树沟、小乔木沟、德胜岭等地都采到了叶肢介化石,特别是在该组下部采集到了阜新东方叶肢介和九佛堂东方叶肢介;顶部采集到了沙海组的典型分子延吉叶肢介属的几个种,证明在滦平盆地西瓜园组之上、阜新组(青石砬组)之下确有九佛堂组—沙海组,解决了长期以来有关滦平盆地"大西瓜园组"或"大九佛堂组"的争论。至此,大北沟组、大店子组、西瓜园组、九佛堂组与沙海组的叶肢介化石组合序列初步建立起来。结合滦平盆地晚期中生代沉积盆地演化,讨论有关陆相建阶问题,结合前人资料,冀北-辽西晚期中生代自下而上拟初步建立三宝营阶(土城子阶)、榆树下阶(大北沟阶)、张家沟阶(原大店子组)、李营阶(义县阶)、鹞子梁阶(九佛堂阶)-清河门阶(沙海阶)、海州阶和"孙家湾阶",以供今后讨论有关陆相建阶问题时参考。  相似文献