Subaqueous mass flow origin for Lower Permian diamictites and associated facies of the Grant Group, Barbwire Terrace, Canning Basin, Western Australia

The intracratonic Canning Basin is Western Australia's largest sedimentary basin (>400 000 km²) and has experienced repeated episodes of Phanerozoic extension and subsidence, resulting in deposition of a number of first-order 'megasequences'. A major phase of basin extension and sedimentation (Grant Group) occurred in the Late Carboniferous/Early Permian when Australia lay at high palaeolatitudes. Facies analysis of 5000 m of drill core from 25 continuously cored wells in Grant Group strata on the fault-bounded Barbwire Terrace in the northern Canning Basin identified three facies associations (FAs). These record the predominance of fault-generated, subaqueous mass flow and sediment reworking. The lowest association (FA I; up to 355 m thick) rests unconformably on tilted older strata and consists of coarse-grained, subaqueously deposited, sediment gravity flow facies. These include fault-generated breccias, massive and graded sandstones and conglomerates deposited by turbidity currents and diamictites generated by mixing of different textural populations during downslope remobilization. FA I is overlain abruptly by relatively fine-grained deposits of FA II (up to 140 m thick), which consist of laminated to thin-bedded mudstone and sandstone turbidites, recording an abrupt increase in relative water depths. In turn, these facies coarsen upwards and are transitional into shallow-water, swaley cross-stratified and rippled sandstones of FA III (up to 125 m thick). The overall stratigraphic succession probably records an initial phase of faulting and accommodation of coarse sediment (FA I), a subsequent phase of rapid subsidence, increasing water depths and 'sediment underfilling' (FA II) and, finally, a regressive phase of shoreface progradation. The occurrence of rare striated clasts in FA I suggests reworking of glacial sediment, but no direct glacial influence on sedimentation can be identified.     

Acidic polar compounds in petroleum: a new analytical methodology and applications as molecular migration indices

A new method for analysis of acidic polar compounds, is described and discussed. It allows the simultaneous quantification of carboxylic acids, phenols and carbazoles and combines accuracy with a short turnaround time, a requirement strictly necessary for industrial applications. Routinely use of this methodology (more than 50 applications in many different sedimentary basins) has supplied many important pieces of information about oil origin, maturity, biodegradation and, in particular, has allowed to define a molecular migration index (MMI), based on relative abundance of phenol and alkyl phenols. The combination of well-established geochemical tools focused on saturated and aromatic fractions (such as biomarkers, compound specific isotope ratio analysis, and GC fingerprinting) with this methodology results in the definition of an integrated interpretative sequence. This last enhances the quality of interpretations through cross-checks and permits a better exploitation of oil samples by using also their less explored fraction, i.e. the polar compounds. Application results of this methodology are only shortly mentioned in this paper, which is mainly focused on analytical aspects. The results will be more extensively discussed in a future publication.     

Isotopic composition of xenon in petroleum from the shell bullwinkle field

We have measured the abundance and isotopic composition of xenon in petroleum samples from the Shell Bullwinkle Field off the coast of Louisiana. We used an oxidation and purification procedure designed to insure complete extraction and clean up of xenon from the petroleum. The xenon isotopic composition was found to be similar to the atmospheric value for one petroleum sample. While the results of the second sample suggest possible enrichment of the heavier isotopes, the errors associated with these excesses preclude a definitive statement to that effect. No monoisotopic enrichment in¹²⁹Xe was detected in either sample, the presence of which might have allowed us to deduce the petroleum age. Our results represent only the second xenon measurement from petroleum, and the concentrations are within the range of values published in the earlier report.     

兴国杨村岩体特征及侵位机制探讨

以1：5万高兴幅的资料,对前人认为的混合花岗岩,均质混合岩的杨村岩体,进行了解体,认为该岩体从早至晚具有成份上和结构上双重演化特征,在侵位机制上具有被动－主动的双重侵位模式。     

调质阻尼器地震反应控制应用研究

本文在结构地震反应时程分析基础上,研究调质阻尼器控制地震反应的最优参数设计方法,分析了多自由度体系的阻尼器设计以及调质阻尼器控制的失调效应．并用算例验证了该设计方法用于地震反应控制的可行性。     

超临界萃取／气相色谱—质谱测定油页岩中的生物标志物

采用超临界萃取 /气相色谱 -质谱技术测定了广东茂名油页岩中环己烷的链取代烃、甾烷、甾烯和藿烷等生物标志物 ,其分析结果与经典索式抽提和文献结果基本相符。该方法与索式抽提法相比简单、快速、无污染和危险 ,可用于油页岩等固体样品中生物标志物的分析     

Characteristics of paleoproterozoic Subduction System in Western Margin of Yangtze Plate

INTRODUCTIONDebate centered on Proterozoic tectonic style and crustalevolution has existed for a long time.The customary viewbelieved that the Proterozoic undeveloped solid plate could notput into effect on the subduction because of the high heat flowin the earth,and the continental crustal growth was dominatedby mafic magm a vertical underplating (Wyborn,1988;Etheridge etal.,1987) .However,many observations recentlyobtained from Proterozoic mobile zones in the world suggeststhat Proter…     

Godzilla from a Zoological Perspective

The 1998 TriStar movie Godzilla proved to be a major blockbuster, although not the financial success that was initially anticipated and movie critics have been rather unforgiving. Apart from a radically different external morphology compared to the classic Japanese movie monster, the new Godzilla character apparently was made different from the old version on a number of key points to make him more biologically probable. However, calculations show that his limbs and limb muscles must have been severely undersized to move his huge bulk around at even a leisurely pace, and most other biological problems with the old Godzilla, e.g., growth rates and reptilian physiology at such a massive size, have remained unaltered. The old Godzilla was actually the more plausible from a biomechanical point of view.     

MS-215型大直径绳索取心器及其在煤层气井中的应用

根据煤层气井快速、安全的取心要求,结合现场条件,研制了MS-215大直径绳索取心器。文中介绍了取心器的设计思路、结构特点及现场应用效果。结果表明,该取心器设计合理,机构动作可靠,岩煤心直径大、采取率高、提出速度快,尤其适合煤层气井煤心的采取。      

凤滩电厂近坝库区边坡岩体力学性质试验研究

通过室内岩石力学性质、节理岩样剪切强度试验及现场岩体结构面推剪试验研究,对凤滩电厂近坝库区4个边坡岩体的强度和变形特性进行了分析,取得了边坡岩体力学性质基本参数。为边坡稳定性分析及工程设计提供了可靠依据。