广西宁明地区第三系沉积相研究及对储集性的控制

在总结前人资料基础上，依据岩性、古生物和地震资料，将宁明等三盆地第三系自下而上划分为：下大阐、上大闸、宁明、弄怀四个组。利用岩性、沉积特征、粒度、地震诸方面资料将本区第三系划分出：洪积扇河流、湖岸、湖泊和沼泽等五个相，并对各种沉积微相特征进行描述。同时研究了本区第三系不同阶段的沉积相展布特征及沉积相对储集性的控制。     

Subaerial terminoglacial fans II: a semi-quantitative sedimentological analysis of the middle and distal environments

Twenty-five fans in NE Poland, formed under subaerial terminoglacial (previously called ice-contact) conditions, were investigated to model the dominant genetic processes involved. These fans show, as do other types, a proximal, a middle and a distal subenvironment. It is found, however, that the characteristics of these subenvironments as present in subaerial terminoglacial fans differ in several respects from those in fans formed under other climatic conditions. The present study deals with the middle and distal subenvironments. These appear to be much less complex than the proximal subenvironment in this type of fan. The middle terminoglacial fan comprises two sandy facies, characterized by unchannelized transport (mainly sheet floods) and stream flows. The distal terminoglacial fan is characterized by one (sandy/silty) facies, resulting from unchannelized currents and from settling in ephemeral ponds; braided streams play a secondary part in this fan subenvironment. The characteristics of the middle and distal fan subenvironments are described and illustrated, as is the facies from the distal subenvironment. Their vertical and lateral relationships are presented in a facies model.     

海南一次冰雹天气过程成因分析

利用海南岛上常规观测资料,雷达、葵花卫星等非常规观测资料,欧洲中心再分析资料和NCEP全球实时海温,对比分析了2018年3月3日海南冰雹的环境条件及其中尺度特征。结果表明:(1)3月2—4日,大尺度环流特征为中层干冷的W—SW急流、低层SW暖气流及地面西南低压槽。(2)3日的区域大气层结处于稳定转变为不稳定的状态,局地增长的不稳定能量在海风锋的触发下强烈释放,适宜的0～6km垂直风切变,0℃、20℃高度有利于对流单体发展成雹暴单体。(3)2日海南岛附近区域层结稳定,CAPE值偏低;4日海南岛处于低层大风核入口前侧,水汽辐散,海风锋垂直环流被抑制,这些都不利于强对流的发展。(4)此次降雹单体具有多个雷达回波特征,当移入多普勒雷达静锥区后,利用风廓线雷达资料可监测到高层急流脉动下传,0～5km、0～3km垂直风切变相继增大的特征,对判断风暴的演变具有重要参考意义。(5)初生对流单体在地面辐合线和儋州中部露点锋交界处生成,在海风锋北端和海口-澄迈北部露点锋重叠区发展为雹暴单体,雹暴单体前沿的露点锋有新生单体的传播。     

The Forced Secondary Circulation of the Mei-yu Front

Using National Centers for Environmental Prediction reanalysis data for the period 28 June to 12 July during 2001 to2013, the secondary circulation(SC) associated with the mei-yu front was quantitatively diagnosed by numerically solving a primitive version of the Sawyer-Eliassen equation. Results demonstrate that a direct SC exists near the mei-yu front zone during mid-summer and the synoptic-scale geostrophic deformations are the main factors determining SC structures. About94% of the sinking strength and 61% of the ascending strength in the SC are induced by the geostrophic deformations.Other terms, such as diabatic heating, ageostrophic dynamical forcing, and frictional forcing, mainly influence the fine flow pattern of the SC. The forced SC produces a frontogenesis area tilting to the north with altitude. Further diagnosis clarifies the positive feedback involving the geostrophic shear forcing and vorticity frontogenesis in the upper-level mei-yu front zone. Furthermore, statistical results indicate that all 34 deep convection cases that occurred in the warm region of the meiyu front over the period 2004-2013 experienced high-level frontogenesis associated with along-jet cold advection. The cyclonic shear forcing "moved" the monsoon SC's subsidence branch to the warm side of the mei-yu front and caused the subsidence branch to extend downwards to the lower troposphere, conducive to the initiation of deep convection in the warm region of the mei-yu front.     

Shifting of the volcanic fronts during Early to Late Miocene in the Northeast Japan arc

Abstract Recent advanced chronological studies for the Tertiary volcanic rocks from the Northeast (NE) Japan arc revealed three volcanic fronts which differed in temporal and spatial distribution. These fronts were (i) the Matsumae-Shizukuishi-Shiogama line of 22–25 Ma which is obliquely across the Quaternary volcanic front (QVF); (ii) the Tomari-Shiogama line of 13–16 Ma which exists 30–50 km east of the QVF and (iii) a line of 0–8 Ma which is the same as the QVF. The first shifting of the 22–25 Ma line to the 13–16 Ma one was due to the counterclockwise rotation of the NE Japan arc during 20–12 Ma as proposed by Otofuji et al . (1985), and the second shifting of the 13–16 Ma line to the 0–8 Ma line could have contributed to a decrease in the dip of the slab of the Pacific plate which subducted beneath the NE Japan arc during 13–8 Ma.     

A discussion on the boundary between diagenesis and metamorphism with reference to zeolite facies

Abstract A Triassic formation in the Turpan-Hami and Ordos basin of China gives two typical examples of occurrence of laumontite belonging to diagenetic facies. Sandstones of the Upper Triassic Yanchang Formation in the eastern sector of the Ordos basin are formed at the mature stage of mesodiagenesis at temperatures in the range of 71-120°C, while the temperatures of the oil-bearing beds Chang-6 and Chang-7 where laumontite is present are about 81-88°C. The laumontite-bearing beds of the Middle Triassic in the Hami depression are presently at the supermature stage of organic matter, the corresponding diagenetic temperature being about 140 °C. The term zeolite facies should be rejected, and the features of metamorphic stage should be clearly denned, such as closely packed grains, absence of pores and cements, and characteristic mineral assemblages including sericite, epidote, muscovite, illite (2M₁), chlorite (IIb, β= 97°), dickite, pyrophyllite, graphite, chlorozeolite formed at temperatures of 200°C and Ro values of 2.5%; the stage is also characterized by schistosity and illite crystallinity of IC = 0.42°Δ 2θ. The anchimetamorphic zone is characterized by some characteristic minerals such as paragonite, rectorite, albite, laumontite, illite (1M), chlorite (Ib, P = 90°+ IIb, β= 97°) formed at temperatures of 130-200°C and Ro values of 1.3-2.5% as well as other quantitative parameters of organic matter.     

济阳坳陷上第三系沉积相研究

本文综合运用地质、测井、地震和化验分析等资料，对济阳坳陷上第三系沉积特征进行了全面系统地研究，认为该时期发育冲积扇和河流2种沉积相类型，河流相可细分为4种亚相7种微相。通过单井和连井剖面相分析，研究了沉积相的演化规律，并编制出各时期的沉积相平面图，分析了物源区及古河流流向，指出了有利的油气储集相带。     

变质地质学的三大前缘课题

本文主要从三个方面反映１９８７年以来国内外变质地质学研究的新进展：（１）变质Ｐ－Ｔ－ｔ轨迹与区域岩石学研究；（２）变质流体与岩石的相互作用；（３）高压、超高压变质。变质ｐ－Ｔ－ｔ轨迹按地壳拉张区、地壳增厚区、俯冲带和麻粒岩相变质地区等不同构造环境予以论列；变质流体岩石的相互关系是按区域变质、接触变质和麻粒岩相变质地区等三个类型对比描述。高压、超高压变质研究近年来得到快速发展，也提出了许多问题。本文主要介绍柯石英榴辉岩岩石学和榴辉岩相岩石学的主要问题。     

榴辉岩相的重新评价

给出了超基性，基性，泥质，长英质，硅质和碳酸盐等不系列岩石榴辉岩相的典型矿物组合，重新确认了榴辉岩相的存在，榴辉岩相的Ｐ－Ｔ区间大致为１．０－４．０ＧＰａ和４００－９００℃可进步划分出低温，中温，高温和超高压等４个亚相，除少数地区蓝片岩相在空间上可直接过渡为低温榴辉岩亚相外，榴辉岩相与其它变质相不构成相系，它们之间属相变关系，最后对榴辉岩相的复杂性进行了讨论。     

方解石岩─—矽卡岩硼矿床的特征含矿岩石

含硼方解石岩是矽卡岩硼矿床的特征含矿岩石，是含硼气液直接作用于白云石的结果，由于它是组成矽卡岩硼矿床的主要岩石类型，而且其矿物成分和化学成分既富钙、又富镁，因此矽卡岩硼矿床应当是钙镁质矽卡岩矿床，同时它的产状也与一般矽卡岩金属矿床不同，硼矿物一方解石相的提出，不仅具矿床学上的理论意义，而且具有找矿意义。