内蒙古自治区额济纳旗呼伦西白金矿成矿地质条件及找矿模式

额济纳旗呼伦西白金矿床位于呼伦西白-珠斯楞反＂S＂型弧形构造的西端,北西向断裂规模较大,既是主要的控岩、控矿构造,也是热液活动的主要通道;后期叠加的北东向次级构造（与次火山岩活动或岩体的深部隐爆作用有关）是本区重要的储矿构造。矿体赋存在侏罗纪斑状黑云母花岗岩、正长斑岩内或与地层接触的内外带的不同构造部位,成矿物质主要来源于该期次火山岩活动,属于岩浆期后热液碎裂蚀变型、次火山岩型（或岩浆隐爆角砾岩型）金矿床。矿区内已发现的13条金矿脉产出环境可分为两种类型：一种是岩体内部或与围岩的内接触带,另一种是外接触带中的破碎带（或薄弱带）。与金矿形成关系密切的蚀变主要为硅化、黄铁矿化、黄铜矿化,含金品位与这些金属硫化物（或其氧化物）的含量呈正相关关系。在分析矿床的成矿地质条件的基础上,初步建立了该矿床的成矿模式,总结了综合找矿标志。     

Source water of two-pronged northward flow in the southern Taiwan Strait in summer

It is generally accepted that the flow is northward in the Taiwan Strait during summer and that the strongest current is detected in the Penghu Channel between the Penghu Islands and the Taiwan Island. This current, the eastern prong flow, is made up of waters from the South China Sea (SCS) and the Kuroshio. North of the Penghu Islands, the current veers to the west before turning northward again because of the shallow Chang-Yuen Ridge, and extends westward off the coast of Taiwan. There is a second prong of northward flow existing between the Taiwan Bank and the China mainland coast. Here, we show with observational data as well as results from a numerical model that this water receives little influence from the Kuroshio and is distinctively cooler, fresher, less oxygenated and more acidic, and contains more dissolved inorganic carbon than waters at the same density level of the eastern prong. Evidence is provided to show that the source water of the western prong should be the subsurface water from the strong upslope advection flowing northward from the SCS to the southern Taiwan Strait and upwelling along the coast during the favorable southwesterly wind. Subsequently, the upwelled water flows over the saddle west of the Taiwan Bank and joins the main flow northwest of the Penghu Islands.     

论南北宋陵布局

宋代统治中国长达320年,在此期间,国家军力衰弱,饱受外敌欺凌,公元1127年,赵构在南阳称帝后逃至南方,后定都杭州,取名临安。南北两宋在政治、文化等领域可谓一脉相承,然而在陵墓布局上却差异很大。与论者所说的南宋六陵在布局上完全继承北宋的堪舆思想相去甚远,南北宋陵在整个陵园的布局所遵循的堪舆思想不同,在兆域内的布局也大相径庭,皇家丧葬文化在南北宋有明显差异,并且这种差异还影响到了明清皇陵布局。揭示南宋皇陵布局及堪舆思想的演变,还原历史,是该文写作的宗旨。     

STUDY ON PREDICTION FOR TRANSPORT AND DIFFUSION OF DREDGED MATYER IN JIAOZHOU BAY, CHINA

The finite-element method was used to simulate the currents of Jiaozhou Bay and the nearcoast areas, and then established the model of the transport and diffusion of suspended particulate matter there. The transport and diffusion of dredged matter near the discharging field were estimated ; and the results were used to analyze the effects of the suspended particulate matter on the marine environment.     

New self-similar solutions of polytropic gas dynamics

We explore semicomplete self-similar solutions for the polytropic gas dynamics involving self-gravity under spherical symmetry, examine behaviours of the sonic critical curve and present new asymptotic collapse solutions that describe 'quasi-static' asymptotic behaviours at small radii and large times. These new 'quasi-static' solutions with divergent mass density approaching the core can have self-similar oscillations. Earlier known solutions are summarized. Various semicomplete self-similar solutions involving such novel asymptotic solutions are constructed, either with or without a shock. In contexts of stellar core collapse and supernova explosion, a hydrodynamic model of a rebound shock initiated around the stellar degenerate core of a massive progenitor star is presented. With this dynamic model framework, we attempt to relate progenitor stars and the corresponding remnant compact stars: neutron stars, black holes and white dwarfs.     

Evolution of the mid-channel bars in the middle and lower reaches of the Changjiang (Yangtze) River from 1989 to 2014 based on the Landsat satellite images: impact of the Three Gorges Dam

The mid-channel bars have long been identified as essential landforms in the large rivers of the world, and the significance of connectivity between morphology and flow-sediment dynamics has been intensively emphasized. In this study, remote sensing images and associated hydrological data from 1989 to 2014 were used to explore mid-channel bars evolution in the middle and lower reach of the Changjiang and their responses to the Three Gorges Dam (TGD), the world’s largest hydrological engineering. The results indicated that mid-channel bars, respectively, exhibited deposition and erosion in the flood and dry season in pre-TGD period, while mild deposition in flood season and deposition in dry season were found in post-TGD period. As a consequence, mid-channel bars area was characterized by ‘remarkable seasonal differences in pre-TGD period, mild seasonal pattern in post-TGD period’. The obvious shift in seasonal features could be attributed to the TGD operation in 2003. Specifically, flood duration decrease and sediment load reduction following TGD regulation suppressed the bars growth in flood season. TGD-induced variations in differences between sediment carry capacity and suspended sediment concentration resulted in the bars transformation in dry season. Meanwhile, the change trends of downstream mid-channel bars became weak as their locations’ distance to TGD increases because of the river adjustment and tributaries supplement. Moreover, mid-channel bars in different river patterns presented various change trends with the most remarkable variation being detected in goose-head-shaped river pattern. The results of this paper provide a theoretical basis for the river channel improvement in the middle and lower reaches of the Changjiang River.