一种基于三角形运动分块的HEVC视频编码方法     

刘梅锋  钟国韵  徐洪珍 《华东地质学院学报》2014,(3):310-315

分析了目前H.264/AVC已有的非规则运动分块方法的优缺点,根据高效率视频编码（High Efficiency Video Coding,缩写HEVC）标准,提出了三角形的帧间预测单元（Prediction Unit-PU）运动分块,相比常规的PU运动分块,它的斜边更适合一些场景中有着斜边的运动对象,从而提高编码效率。根据该三角形的运动分块形状,提出三角形PU运动分块的运动向量预测方法和运动估计方法。通过分析斜边将产生的块效应方向,相应地提出了优化HEVC滤波方法。实验结果显示,相比已有的非规则运动分块的编码方法,在编码时间平均上升23%的前提下,本算法在BD-rate方面平均降低了2.1%。  相似文献   

华北地块北缘内蒙古固阳地区早二叠世岩体的侵位深度及其构造意义   总被引：4，自引：1，他引：3       下载免费PDF全文

吴飞  张拴宏  赵越叶浩 《中国地质》2014,41(3):824-837

运用角闪石一斜长石温度计和角闪石全铝压力计估算的华北地块北缘内蒙古隆起西段固阳地区早二叠世花岗质岩体的结晶温度和侵位深度分别为679.1~728.7℃和15.6~19.8 km,表明白早二叠世以来,固阳地区至少有15.6km的地壳岩石被剥露。这一构造抬升及剥露是造成该区中—新元古代地层不连续分布及古生代—早中生代地层普遍缺失的最主要原因。岩体侵位深度与区域前二叠纪最大沉积地层厚度(13.0 km)对比结果表明,早二叠世之前,华北地块北缘已经发生了明显的褶皱或逆冲构造变形,从而导致了地壳岩石的叠覆与加厚。这一早二叠世之前的构造变形及地壳加厚可能与晚古生代期间古亚洲洋板块向华北地块下俯冲有关。  相似文献   

新疆博乐市桑金布拉克饰面石材花岗岩矿地质特征          下载免费PDF全文

王永祥  王锋 《地质找矿论丛》2014,29(4):570-578

文章阐述了新疆博乐市桑金布拉克饰面石材花岗岩矿的主要矿体形态、产状、规模和矿石的类型、品种及物理性能、放射性、荒料率、加工技术性能等质量特征,以及工作区水、工、环地质勘查,矿床开采技术条件;估算了花岗岩矿石资源/储量.  相似文献   

苏北盆地沙瓦油区滚动勘探方法研究     

邱旭明  严元锋  唐焰 《江苏地质》2014,38(1):66-71

高邮凹陷北斜坡中东部沙瓦油区是典型的复杂小断块油田,具有地下地质、地表条件复杂的特点,多年的油气勘探实践说明:不断深化石油地质理论研究,及时转变勘探思路,发展完善复杂小断块勘探配套技术是油气勘探持续突破和发现的技术支撑,坚持滚动勘探开发一体化的运行模式,是提高复杂小断块勘探效益的有效机制。  相似文献   

Geochronology and isotope analysis of the Late Paleozoic to Mesozoic granitoids from northeastern Vietnam and implications for the evolution of the South China block     

《Journal of Asian Earth Sciences》2014

In northeastern Vietnam, Late Paleozoic and Permo-Triassic granitic plutons are widespread, but their tectonic significance is controversial. In order to understand the regional magmatism and crustal evolution processes of the South China block (SCB), this study reports integrated in situ U–Pb, Hf–O and Sr–Nd isotope analyses of granitic rocks from five plutons in northeastern Vietnam. Zircon SIMS U–Pb ages of six granitic samples cluster around in two groups 255–228 Ma and 90 Ma. Bulk-rock ε_Nd (t) ranges from −11 to −9.7, suggesting that continental crust materials were involved in their granitic genesis. In situ zircon Hf–O isotopic measurements for the granitic samples yield a mixing trend between the mantle- and supracrustal-derived melts. It is suggested that the granitic rocks were formed by re-melting of the continental crust. These new data are compared with the Paleozoic and Mesozoic granitic rocks of South China. We argue that northeastern Vietnam belongs to the South China block. Though still speculated, an ophiolitic suture between NE Vietnam and South China, so-called Babu ophiolite, appears unlikely. The Late Paleozoic to Mesozoic magmatism in the research area provides new insights for the magmatic evolution of the South China block.  相似文献   

Magnetic fabric and paleomagnetism of the Middle Triassic siliciclastic rocks from the Nanpanjiang Basin,South China: Implications for sediment provenance and tectonic process     

《Journal of Asian Earth Sciences》2014

A combined magnetic fabric and paleomagnetic study has been carried out on the siliciclastic rocks gathered from a stratigraphic cross-section through the Nanpanjiang Basin, South China, in an attempt to extract the paleoflow information preserved in and, thus, constrain the possible origins of these clastic rocks. The sediments used for this study were formed by sediment-gravity flows along the southern margin of the South China block in the Middle Triassic time (ca. 245–228 Ma). The results show a normal distribution of both low field magnetic susceptibility values and natural remanent magnetization intensities, which along with the monotonic detrital framework mode, mainly comprising quartz and lithic particles, may suggest a single provenance involved in deposition of these clastic deposits. Anisotropy of magnetic susceptibility (AMS) analysis acquires primarily the sedimentary magnetic fabrics, which, in this study, reveal paleoflow directions ranging from NNW to ENE with an overall mean orientation of NE. Demagnetization on a part of samples isolates a characteristic remanent component averaged at D = 44.8°, I = 16.9°, κ = 9.7, α₉₅ = 6. 5°, n = 55, corresponding to a paleolatitude N8.6° and a clockwise rotation of ca. 45° since the Middle Triassic for the studied cross-section. This mean direction passes fold tests and is consistent with the reference direction expected from the South China block at the 95% confidence level. Restoring this ∼45° declination renders an overall northward paleoflow, which, combined with other evidence, suggests a southern provenance for these sediments during deposition in the Middle Triassic time. In terms of the early Mesozoic plate framework of southeastern Asia, a tectonic scenario is proposed here, whereby the nearly N–S convergence of the Indochina and South China blocks and its related Indosinian orogeny in the Middle Triassic caused the formation of the Nanpanjiang foreland basin, which was filled by voluminous detritus shed from the uplifted orogenic belt on its southern side.  相似文献   

帕米尔构造结锂矿资源潜力评价——基于1 ∶ 100万地球化学调查     

范堡程  张晶  孟广路  薛仲凯  吴欢欢  曹积飞  刘明义  洪俊  唐卫东  刘天航  МирзоевТавфик  ХасазодаСабзали 《西北地质》2022,(1):156-166

帕米尔构造结夹持于塔吉克盆地与塔里木盆地之间,是印度板块与欧亚板块碰撞形成的巨大山结,由西侧的兴都库什山、中部的帕米尔高原、东侧的昆仑山3部分组成,它们经历了相同的地质演化历史.近年来,在西部的兴都库什地区发现了帕斯古斯塔、贾马纳克等大型、超大型伟晶岩型锂矿,在东侧的西昆仑地区发现了大红柳滩、俘虏沟等具大型、超大型远景...  相似文献   

东北稳定参考框架NEChina20     

鲍艳  王国权  于笑  赵瑞斌  肖根如  许建东  甘卫军 《大地测量与地球动力学》2021,41(9):899-910

选用中国地壳运动观测网络（CMONOC）在东北地区2012~2019年的GNSS观测数据,建立东北稳定参考框架（NEChina20）,实现由全球参考框架IGS14到NEChina20的位置坐标转换。NEChina20与全球参考框架IGS14保持坐标系缩放比例一致,两者在历元2020.0对齐。NEChina20的精度（稳定性）在水平方向约为0.5 mm/a, 在垂直方向 约为0.6 mm/a。参考框架的稳定性随时间的推移和覆盖面积的增加而退化,建议NEChina20 的适用范围在时间上限于从2005~2025年约20 a的时间窗口,在空间上限于东北地块及南端的河套断陷带和张家口-渤海断裂带。选用东北地区4个基岩站2000~2019年的GNSS连续观测数据,建立东北地区季节性地面升降模型。NEChina20与该季节性模型相结合,为在东北地区开展长期的、高精度的变形观测构建了基础设施。  相似文献   

蚌埠荆山和涂山岩体的年代学、地球化学特征及其动力学意义   总被引：4，自引：1，他引：3  

李印  韩峰  凌明星  刘健  李献华  李秋立  孙卫东 《大地构造与成矿学》2010,34(1)

对蚌埠地区的荆山和涂山花岗岩进行了详细的年代学和岩石地球化学研究,分析结果表明:花岗岩的SiO2含量较高,介于71.22%～73.76%之间,富K2O、Na2O,贫TiO2、CaO、MgO,为弱过铝质岩石。K2O-Na2O图解上,所有数据点都落在"I"型花岗岩区域,结合呈右倾的微量元素标准化蛛网图,可知该区富集大离子亲石元素,同时具有明显的U、Pb、Ba、Sr正异常,Ti的负异常,暗示蚌埠岩体的形成背景可能为造山后的伸展环境。CamecaIMS1280SIMS锆石U-Pb年龄分析表明,主要有800Ma左右的新元古代年龄、三叠纪相关的220Ma和晚侏罗世的165Ma这三种主体年龄。根据上述地球化学资料,推断蚌埠岩体的母岩浆来源于火成岩的部分熔融,岩浆源区为与华北板块碰撞后继续向北伸展的部分扬子板块下地壳火成岩物质,其中,800Ma左右的新元古代年龄解释为扬子板块下地壳物质的继承锆石年龄,三叠纪的继承锆石理解为三叠纪时期华南、华北板块的碰撞导致,晚侏罗世的岩浆活动推测由于古太平洋板块北西向的斜向俯冲诱发扬子板块下地壳的物质部分熔融所致。  相似文献   

华北陆块的构造格局及其演化   总被引：3，自引：0，他引：3       下载免费PDF全文

李俊建  罗镇宽  燕长海  谢汝斌  李德胜  李洪奎  骆辉  刘晓阳  刘晓雪  李生 《地质找矿论丛》2010,25(2):89-100

华北陆块是由陆核→地块(体)→联合地块逐渐生长、增大、拼合形成的。根据大量的地质构造、地层岩石、同位素年代学、含矿特征、地球化学、地球物理等多方面的信息,华北陆块可划分为辽吉、燕辽、阴山、晋冀、豫皖、阿拉善前寒武纪地块和鲁西、胶北前寒武纪地体,鄂尔多斯、华北中新生代盆地,共10个构造单元。华北陆块是多地块拼(缝)合形成。据现有的岩石记录,始太古代-中太古代主要是陆核生成阶段,不排除在早期有绿岩带形成;新太古代主要是花岗岩-绿岩带的生成阶段,花岗岩-绿岩带环绕地核周边形成地块,是华北陆块结晶基底的主要生长时期;古元古代是联合地块的形成阶段,多个地块(体)拼合形成联合地块;中元古代是稳定环境下的拉伸阶段,沿陆块南北两缘形成三大裂谷系(燕辽、狼山—渣尔泰、熊耳山—西阳河);新元古代-古生代陆块形成稳定环境的沉积盖层,除南北两缘外,内部很少有岩浆活动;中-新生代陆块大部分地区为活动大陆边缘的环境,出现大规模的构造-岩浆活动。  相似文献