海南戈枕韧性剪切带微观构造研究

韧性剪切带的定性－定量分析。能更清晰、直接地揭示构造运动生发发展过程应力、应变的状况。作者对海南戈枕韧性剪切带从显微构造角度作了系统研究工作。通过矿物粒度、形态比统计，在纵横方向上更明确了内部的复杂分带性；通过显微批向构造、矿物组权及变形变晶分析了探讨了构造活动的方式、方向；通过古应力值、剪应变、总位移量、弗林系数的测算，定量表述了该带变形机制及应力、应变速率大小。     

新疆东准双泉地区与韧-脆性剪切带有关的金矿成矿

[摘要]区域成矿背景分析表明,东准噶尔卡拉麦里地区韧-脆性剪切带形成于陆-陆碰撞体制, 在330 ~265Ma 期间,受挤压伸展体制转换影响,先后经历了韧、脆性构造变形。对与韧-脆性剪切带有 关的金矿石英流体包裹体研究发现,包裹体以气液相为主,均一温度集中在160 ~ 240益,成矿流体盐度 为3. 55 ~4. 5wt%NaCl。成矿流体的氢、氧同位素组成表明成矿流体的水为变质成因水。金属硫化物硫 同位素啄34 S 值为3. 54 ~10. 68译,显然属于混染硫。黄铁矿包裹体氦氩同位素3 He/ 4 He 值为0. 18 ~2. 18 Ra,属幔壳混源。成矿年代学研究表明,双泉金矿成矿时代及控矿构造脆性变形时间为(269依9) Ma ~ (260依4)Ma,金初始富集时间在310Ma 前后,并得到含矿花岗斑岩U-Pb 同位素年龄的支持,该事件在 东准地区均有同位素年龄记录,是区域性的构造岩浆成矿流体热事件。上述资料表明,金矿成矿过程、 成矿流体性质等在时间、空间上严格受韧-脆性剪切构造变形带控制。     

东海陆架外缘隆起带地质构造特征

根据地质、地球物理及钻探资料，结合周边区域地质资料，论证东海外缘隆起带前中中新世基底岩系组成及地质构造特征。     

广西钦州湾-防城港潮间带表层沉积物重金属生态风险评价

对广西钦州湾-防城港潮间带表层沉积物中的重金属元素Hg,Cd,As,Pb,Cu,Cr和Zn的质量分数和空间分布特征及其潜在生态危害进行了分析和评价。钦州湾潮间带表层沉积物中的重金属元素的质量分数相对较低,均在国家一级标准之内。空间分布上,从防城港-企沙-鸡墩头-三娘湾-沙角,重金属元素含量有逐渐增加的趋势,尤其在企沙QZ-07、三娘湾QZ-09和沙角地区的QZ-08剖面的质量分数最高。其中Cd,Cu和Zn的最高值出现在沙角地区QZ-08剖面,其平均质量分数分别达到了0.14,29.15和64.56μg/g;Hg,As,Cr和Pb的最高值出现在企沙地区QZ-07剖面,其平均质量分数分别达到了0.11,11.29,88.23和26.47μg/g。选用Hakanson的潜在生态风险指数法对沉积物的环境质量进行了评价。结果表明,钦州湾潮间带表层沉积物重金属元素的潜在生态风险参数均小于40,而风险指数均小于150,显示其潜在生态风险为低风险级别。但部分调查剖面如沙角QZ-08剖面的生态危害风险指数接近临界值140,所以该污染的风险是存在的。在空间分布上,从防城港-企沙-鸡墩头-三娘湾-沙角,重金属元素的污染生态危害指数有逐渐增加的趋势,尤其在企沙QZ-07、三娘湾QZ-09和沙角地区的QZ-08剖面的危害指数最高。     

Petrological and Os Isotopic Characteristics of Zedong Peridotites in the Eastern Yarlung–Zangbo Suture in Tibet

The Zedong ophiolites in the eastern Yarlung–Zangbo suture zone of Tibet represent a mantle slice of more than 45 km~2. This massif consists mainly of mantle peridotites, with lesser gabbros, diabases and volcanic rocks. The mantle peridotites are mostly harzburgite, lherzolite; a few dike-like bodies of dunite are also present. Mineral structures show that the peridotites experienced plastic deformation and partial melting. Olivine(Fo89.7–91.2), orthopyroxene(En_(88–92)), clinopyroxene(En_(45–49) Wo_(47–51) Fs_(2–4)) and spinel [Mg~#=100×Mg/(Mg+Fe)]=49.1–70.7; Cr~#=(100×Cr/(Cr+Al)=18.8–76.5] are the major minerals. The degree of partial melting of mantle peridotites is 10%–40%, indicating that the Zedong mantle peridotites may experience a multi–stage process. The peridotites are characterized by depleted major element compositions and low REE content(0.08–0.62 ppm). Their "spoon–shaped" primitive–mantle normalized REE patterns with(La/Sm)_N being 0.50–6.00 indicate that the Zedong ultramafic rocks belong to depleted residual mantle rocks. The PGE content of Zedong peridotites(18.19–50.74 ppb) is similar with primary mantle with Pd/Ir being 0.54–0.60 and Pt/Pd being 1.09–1.66. The Zedong peridotites have variable, unradiogenic Os isotopic compositions with ~(187)Os/~(188)Os=0.1228 to 0.1282. A corollary to this interpretation is that the convecting upper mantle is heterogeneous in Os isotopes. All data of the Zedong peridotites suggest that they formed originally at a mid-ocean ridge(MOR) and were later modified in supra–subduction zone(SSZ) environment.     

大别造山带地壳泊松比结构与超高压变质带—来自宽角反射与近垂直反射剖面的启示

综合宽角反射、近垂直反射的探测结果和有关地质资料，对大别造山带地壳结构和超高压变质带研究显示：大别造山带地壳具有层块结构特征。沿安义－庄墓剖面，上地壳有7个弹性块体，中地壳有5个，下地壳有4个。扬子与华北地块的主缝合带是超高压变质带，扬子地块与大别造山带的现今分界线是与郯庐断裂相交的太湖－马庙断裂，磨子潭－晓天断裂是大别造山带的北界，北淮阳构造带呈楔状向下插入，它与华北地块的分界是肥中断裂。郯庐断裂在中、上地壳近于直立，下地壳向西倾斜。超高压变质带的厚度为5－7km，产状向北插入到北大别块体之下，折返过程是构造就位，不是大别山的均匀抬升，折返的主运动面是水吼－五河高温剪切带。     

我国中部地带农业现代化建设途径探讨

中部地带是我国农业的精华地带,目前,我国农业发展中面临的部分农产品结构性剩余严重,市场竞争力弱,农业劳动生产率和土地生产力低而不稳,农民收入增长放慢,农业持续发展的后劲不足等问题在中部地带表现更为典型,探索中部地带农业现代化建设的实施途径对于研究和解决当前我国农业发展面临的诸多问题都具有重要的作用。中部地带农业现代化途径主要是：整体规划,分类推进,极点突破;改革城乡户口隔离机制,加速农村城镇化;创新土地流转机制,培育规模经济的现代农业市场主体;创新科技机制,发挥高科技对农业的带动作用;拓宽农产品加工领域加大农产品市场建设力度。     

Analyses d’ouvrages

New structural data and P–T estimates of syn-deformational assemblages within the Beni Bousera peridotites and their crustal envelope are used to explain their Alpine exhumation. The Beni Bousera peridotites occur as thin sheets within high grade crustal units of the lower Sebtides (inner Rif, Morocco) and are composed of weakly deformed spinel lherzolite in the core of the massif and garnet-spinel mylonite at the rim. The main foliation trajectories in both the peridotites and overlying crustal units show systematic rotation towards their mutual contact, indicating a kilometer-scale top to the NW shearing with a dextral component along this crust/mantle contact. Widespread top to the NW shear criteria within the crustal units overlying the peridotite support this feature. Available ages constrain the development of the main foliation in both the peridotites and crustal rocks between 25 and 20 Ma. New P–T data from the peridotites show that deformation occurs during decompression from ≈ 22 kbar, 1050°C to ≈ 9-15 kbar, 800°C. As a consequence, exhumation of the Beni Bousera peridotites takes place during the Oligo-Miocene lithosphere thinning in the footwall of a lithospheric extensional shear zone. The exceptional preservation of garnet within the mylonitic peridotites results from rapid cooling of the border of the massif due to the juxtaposition with colder crustal rocks along this shear zone. Uplifting of the hot mantle rocks simultaneously induces high temperature metamorphism in the overlying crustal units. These new findings allow us to reconstruct the deformation history of the Beni Bousera region and the Alboran domain in the framework of the western Mediterranean geodynamics during the last 40 Myrs.     

郯庐断裂带在辽北地区三叠纪左行韧性剪切带的发现及变形特征

郯庐断裂带位于辽北地区的部分为区域上郯庐断裂北延分支依兰-伊通断裂带的一段,在1：5万区调中发现有北东向展布的三叠纪左行韧性剪切带,此韧性剪切带控制一系列三叠纪侵入岩的分布并对古生代地质体的展布进行改造.     

塔北沙西—轮台地区亚格列木组砂岩沉积相及储层评价

沙雅西—轮台地区卡普沙良群亚格列木组为一套棕红色陆相碎屑岩沉积,包括冲积扇、辫状河、三角洲、辫状河三角洲和砾质滨岸等沉积体系,多呈扇形。岩性较粗,通常具有较高的原始孔隙度,是有利的油气储集体,按储层的好坏可分为4类储层区。