Late Cretaceous-Paleogene Palynostratigraphy from the Arkhara-Boguchan Brown Coal Mine of Zeya-Bureya Depression, Russia

1IntroductionThe Arkhara-Boguchan brown coal mine is lo-cated in the western Arkhara depression,southeast-ern part of the Zea-Bureya Basin (Fig.1). Late Creta-ceous-Paleogene coal-bearing strata are well out-cropped at the Arkhara-Boguchan quarry. It contains four coal-bearing beds (in descending order): “Ve-likan”, “Promezhutochny”,“Dvoinoy”and “Nyzhny”, and composed of three sedimentary cycles (Fig.2). The lower cycle can be divided into two sub-cycles:the lowest sub-cycle is …     

Numerical Simulation of Non-Linear Wave Propagation in Waters of Mildly Varying Topography with Complicated Boundary

In this paper, the characteristics of different forms of mild slope equations for non-linear wave are analyzed, and new non-linear theoretic models for wave propagation are presented, with non-linear terms added to the mild slope equations for non-stationary linear waves and dissipative effects considered. Numerical simulation models are developed of non-linear wave propagation for waters of mildly varying topography with complicated boundary, and the effects are studied of different non-linear corrections on calculation results of extended mild slope equations. Systematical numerical simulation tests show that the present models can effectively reflect non-linear effects.     

苏浙皖地区海相油气地质特征及勘探目标的选择

从晚震旦世开始至中三叠世，苏浙皖（下扬子）地区沉积了三套巨厚的海相烃源岩系，即：上震旦统一上奥陶统，石炭系－二叠系，下三叠统海相烃源岩，三套烃源岩热演化特点不同，下古生界烃源岩经历了加里东、印支－燕山期构造阶段的热演化，已达过成熟干气阶段，上古生界烃源岩基本处于生油阶段晚期；大部分三叠系烃源岩处于成熟生油阶段，少数处于未成熟阶段，区内下古生界烃源岩经历了两次成油过程，第一次发生在加里东运动前的盆地沉降阶段，第二次发生在加里东运动后晚古生代陆表海代积阶段，全区海相油气储盖条件发育，配置有利，经多年油气勘探证实，下古生界油气勘探应立足于苏北地区，上古生界油气勘探除苏北地区外，尚有皖南与浙西地区，中生界海相油气勘探应集中在区内几个发育较好的中生代盆地，如常州、句容，无为，望江盆地等。     

东营凹陷古近系层序地层对成岩规律的控制作用

东营凹陷古近系发育了沙四段底界面(T7)、沙四段与沙三段分界面(T’6)及沙二下亚段顶界面(T’2)等3个二级层序界面。根据对储集层成岩作用的深入研究发现,原有的埋藏成岩作用序列不仅受深度的影响,而且受此层序地层所控制,在层序界面附近和层序体内部存在一定的规律性。据此确定了层序界面附近发育的淋滤、溶解成岩相带和层序体内部发育的黏土矿物转换和化学胶结成岩相带。认识到层序界面通常是流体运移的通道,影响界面上下低水位体系域和高水位体系域内储集层的成岩相展布,对改善储集层储集性能有利;层序体内部储集层成岩差异性明显,储集性往往受到制约。     

Chaleur Urbaine à Montréal

Par des sondages de température effectués en hélicoptère à 12 sites de l'île de Montréal, on a pu mesurer la chaleur générée par la ville en 37 jours assez bien distribués à travers l'année. Cette chaleur fut mise en relation avec deux fonctions exprimant l'intensité du chauffage, la première, selon le nombre de degrés sous 65°F de l'air ambiant, et la seconde fonction, selon la même variable multipliée par la vitesse du vent. Une relation linéaire fut établie dans l'un et l'autre cas entre la chaleur urbaine et l'intensité du chauffage, mais avec une dispersion minimale dam le second cas. Un calcul à partir de la meilleure droite de régression permet de déterminer la chaleur totale génétrée par la ville dans une année, soit 40.2×10¹⁶ calories‐gramme Cette quantité de chaleur est de beaucoup supérieure à la chaleur artificielle générée par les combustions, soit 8.40 × 10¹⁶ calories. On en conclut que la chaleur urbaine ne peut être expliquée sans faire appel au rayonnement so‐Iaire.     

A factor analytic approach to the identification of geomorphic processes from soil particle size characteristics

Q-mode factor analysis of soil particle size data is used to identify the three dominant geomorphic processes responsible for the spatial variability of particle size in a catchment on the basaltic Darling Downs landsurface. Three factors are shown to account for 95 per cent of the textural variability of a suite of transported and sedentary materials. The spatial characteristics of groups of samples associated with the three factors suggests that the three factors are associated with suspended sediment transport and deposition, weathering, and bedload transport and deposition respectively. These interpretations are supported by the detailed graphical analysis of the cumulative particle size curves. The spatially variable influence of the three factors and related processes is given by their respective factor loadings which are mappable for the surface layer materials.     

Paleosols and prehistoric populations in the high plains

Excavations in 1980–1981 at sites (32MZ319 and 32MZ380) along Cinnamon Creek Ridge in the Little Missouri River Badlands of McKenzie County, North Dakota, unexpectedly revealed at each locality the presence of one or more deeply buried paleosols with associated cultural materials. At both sites, 32MZ319 and 32MZ380, multiple paleosols are present, each of which is terminated by an episode of aeolian deposition. Fifteen radiocarbon dates on these paleosols establish an incipient chronology for paleosol development in the study area and permit correlation with other High Plains archaeological complexes. Geological and archaeological data for the two multiple paleosol sites are summarized.     

砂岩型铀矿地浸过程中的溶质迁移机理

讨论了“溶质迁移、溶质迁移面和特征性溶质迁移面”的概念，以及研究溶质迁移的方法和实例。在对381砂岩型铀矿床进行地浸模拟试验的基础上，应用以上概念和方法，对地浸过程中的溶质迁移过程进行了讨论，探讨了地浸过程的机理和发生的水文地球化学作用，总结了溶浸试验过程中的溶质迁移分带。在以上溶质迁移机理研究的基础上．论证了地浸地质工艺参数。地浸过程中分带的研究清楚地显示了浸铀的发展过程及其在各个时期各个地段铀浸出作用的进展程度。