西准噶尔蛇绿混杂岩中洋岛玄武岩研究新进展

洋岛玄武岩(OIB)起源研究是当代固体地球岩石学及地球化学最基本问题之一,通常被认为源于地幔柱。西准噶尔位于中亚造山带的西南缘,该地区发育多条蛇绿混杂岩带,主要包括唐巴勒、玛依勒、达尔布特及克拉玛依蛇绿混杂岩带,它们组成相似,主要为蛇纹岩、蛇纹石化方辉橄榄岩、二辉橄榄岩、纯橄岩、铬铁矿、辉石岩、辉长岩、辉绿岩、玄武岩(拉斑质和碱性)、硅质岩及斜长花岗岩。随着研究的不断深入,在西准噶尔蛇绿混杂岩带中不断有不同时代OIB被识别。这些玄武岩属于碱性玄武岩系列,具有高TiO2和FeOt,低MgO,强烈富集轻稀土元素特征,没有明显Nb、Ta负异常,与日喀则及夏威夷洋岛玄武岩地球化学特征极为相似,可能形成于大洋板内的海山或洋底高原,认为其成因与地幔柱相关,表明在西准噶尔(洋)的演化过程中,不仅是洋内俯冲系统,还伴有地幔柱活动。结合前人研究,认为中亚造山带可能是洋内俯冲+地幔柱复合的演化模型。同时,对中亚造山带中的OIB及OIB型玄武岩形成时代进行系统总结发现,它们不仅时代宽度大,并且具有连续发育的特点。对正确认识地幔柱活动在显生宙中亚造山带地壳增生过程中的贡献提供新的资料和证据。     

Coal-derived Gas Accumulation Characteristics and Exploration Prospects of Upper Paleozoic in Eastern Linqing Depression

<正>1 Introduction Bohai Bay Basin is the highest oil production basin in China,but the proven reserves and production of natural gas is far less than the size of the oil.In recent years,petroleum geologists found one after another in Wenan Slope of Jizhong Depression,Kongxi and Wumaying     

Petrogenesis of I-type granites from Yuqikapa granite pluton of the western Kunlun orogen: Deformation-driven filter-pressing differentiation

<正>1 Introduction The western Kunlun orogen,located in the northwest Tibet Plateau,and is a conjunction between the Pan-Asian and the Tethys tectonic domains.From north to south,the Western Kunlun orogen includes four     

浊积岩型金矿简介

本文简要介绍了浊积岩型金矿的概念、特征、成因和2个浊积岩型金矿的矿床实例,并对浊积岩型金矿概念和应用作了讨论。     

Science and Technology of Delimitation of Continental Shelf and Its Application in Maritime Silk Road Cooperation*

Delimitation of the continental shelf is an emerging interdisciplinary discipline in the field of international marine science and technology. It uses the scientific and technological means to expand the jurisdiction of coastal states based on the international rules of the 《United Nations Convention on the Law of the Sea》. Therefore, it is related to the marine sovereignty rights and interests of a country and also a hot topic of science and technology that all countries have competed to develop. China has launched the research in this field simultaneously with the world's maritime powers, and formed its innovative advantages in such aspects as geological models, detection techniques and delimitation systems in the delimitation of continental shelf, which have become the brand new ties for China's cooperation with foreign countries in marine science and technology, and also the important field in the maritime silk road cooperation in the 21^st century. This paper introduced the basic principles and methods in the delimitation of continental shelf beyond 200 nautical miles (370 km), progress in the delimitation of the global continental shelf, and China's innovative science and technology as well as its application in maritime Silk Road cooperation, and provided the prospect of the future scientific and technological cooperation with foreign countries and development in this filed. And it was suggested China should develop the scientific and technological cooperation on the delimitation of the continental shelf along the Silk Road, promote the scientific and technological development of the delimitation of the continental shelf in China, and enhance China's influence and voice in international ocean affairs.     

柿庄南区块煤层气井早期生产特征及开采建议

从水文地质的角度揭示了不同情况下单井的排水采气机理。在此基础上结合柿庄南区块59口井的实际排采数据,综合分析了气水产量,井底流压,套压及动液面随时间的变化曲线;并将早期生产特征归纳为3种类型：①低产水-高产气型,见气早,产气量高（>1000 m3/d）、产量递减缓慢、峰值产量高,日产水量小（<2m3/d）,套压高;②低产水-中低产气型,日产气小于1000 m3,产量衰减明显且波动大,排水期较长;③高产水型,产气极少或无,日产水量大（>10m3/d）,动液面下降缓慢,套压很低或为零。最后针对不同类型的低产井,提出相应的开采建议：低产水-低产气型井可采用二次压裂措施,改善煤层渗透率;高产水井可通过无机堵水或加大排采强度等方式排采;煤层气井排采要勇于实践,探索适合该区不同煤层的成功排采方法。     

内蒙古锡林郭勒地区上古生界极低级变质作用:伊利石和镜质体反射率的证据

本文使用D/max-2500X射线衍射仪研究了内蒙古锡林郭勒地区上古生界泥质岩石伊利石的成因标志,讨论了有机质镜质体反射率对变质温度的表征。研究区上古生界泥质岩石伊利石的标型特征为:伊利石结晶度分布于0.28～>0.77之间,平均值0.40;伊利石(白云母)多型以2M1型为主,2M1+1Md多型和1Md多型相对较少;伊利石(白云母)b0值变化于8.983～9.046之间,平均值9.019,指示其形成于成岩-极低级变质作用。有机质镜质体反射率具有示踪变质温度的作用,应用Barker and Pawlewiez(1986,1994)、Barker and Goldsteinl(1990)和Mullis et al.(2001)建立的镜质体反射率地质温度计,对研究区上古生界泥质岩石变质温度进行了估算,揭示古地温处于136～321℃之间,温度估算值主要分布在180～260℃之间,平均值为245℃,这表明研究区上古生界遭受了成岩-极低级变质作用,变质程度属近变质带。研究区上古生界泥质岩石的Ro值主要分布在1.01%～3.67%之间,表明有机质演化处于成熟-过成熟阶段,泥质岩石具有生烃的能力,部分层位可能具有形成油气资源的潜力。     

Fine assessment of tropical cyclone disasters based on GIS and SVM in Zhejiang Province, China

Tropical cyclones represent major natural disasters in low- and mid-latitude coastal areas. Effective assessment of tropical cyclone disasters provides a scientific reference for the formulation of tropical cyclone prevention and disaster-relief measures. Tropical cyclone disasters in Zhejiang Province are mainly studied based on GIS technology, by considering disaster-causing factors, disaster-affected bodies, the disaster-formative environment, and spatial distribution of disaster prevention and relief capacity. In light of an uncertain nonlinear relationship between assessment factors and disaster factors, we used support vector machines to establish a fine, quantitative assessment model. This model evaluates the following disaster indices: Disaster-affected population, direct economic loss, affected crop area, and number of damaged houses resulting from a tropical cyclone disaster in Zhejiang, with the county as basic assessment unit. Assessment of tropical cyclone No. 0908 shows that the developed assessment model is able to accurately evaluate the geographical distribution of losses caused by a tropical cyclone.