马超营断裂带区域地球化学特征

该文探讨了马超营断裂带内各地层的成矿元素丰度特征,阐述了该带内成矿元素的分布特征及分布规律,总结了Ａｕ及有关元素Ａｇ、Ｐｂ、Ｚｎ、Ｍｏ、Ｃｏ、Ｎｉ、Ｍｎ、Ｂａ、Ｓｒ、Ａｓ、Ｓｂ、Ｂｉ等异常的特征及其分布规律。研究成果表明：马超营断裂带的韧性—韧脆性剪切带是本区Ａｕ及与其相关的Ａｇ、Ｐｂ、Ｚｎ等成矿元素异常规模、形态和空间分布的控制因素。     

浙江沐尘石英二长岩体的岩石地球化学特征及构造意义

出露于江山-绍兴断裂带西南段东南侧的沐尘岩体,以发育暗色包体和环斑长石为特征,具有显著的岩浆混合作用.寄主岩为二长岩-石英二长岩组合,包体岩石为二长闪长岩.二长岩组合.造岩矿物有钾长石、斜长石、石英、普通角闪石和黑云母.岩石富碱(Na2O K2O=6.58%～10.42%,平均8.41%)、高钾(K2O/Na2O=0.72～1.45,平均1.16)、贫钛(TiO2=0.37%～1.22%,平均0.76%)、富集大离子亲石元素和轻稀土元素,具有钾玄质系列的岩石地球化学特征.该岩体侵位于后碰撞弧构造环境,是早白垩世早期该区重要的构造.岩浆热事件的产物.     

东伙房金矿床成矿构造条件及成矿时代讨论

东伙房金矿床从空间和时间看，固阳～察右中旗韧脆性变形带控矿是间接的，而其变形带附近有成生联系的破裂带控矿则是直接的。固阳～察右中旗变形带及容矿断裂经历了多期变形历史，具有从韧性～脆性变形的全过程。但同成矿期活动明显地表现为脆性破裂。这种浅层次的破裂系统为金矿热液在由深部向上运移过程中，温压条件的改变和金矿的沉淀提供了适宜的物理条件，控矿断裂显示了张性特点，反映了容矿断裂在成矿期自由度相对较大，处于一种扩张的环境之内。金矿形成于中生代这一特定的构造环境之中。     

The Evolutionary History of Ore-forming Processes of Metallic Ore Deposits in Northern Guangxi

The northern Guangxi region is an important rare metal, rare earth metal and polymetallic metallogenic province. In the region there exist five metallogenic series and two metallogenic subseries, whose metallogenesis shows features of polycyclic spiral evolution throughout the geological history. As far as various cycles are concerned, mantle-derived ore substances were reduced while crust-derived ore substances increased from early to late timesfin the whole geological evolutionary history, mantle-derived substances decreased gradually while crust-derived ones increased. Meanwhile ore element associations became more and more varied. In terms of space, mineralization migrated from the old basement outwards, i.e. from west to east during the Precambrian, and from north to south during the Phanerozoic, and again from east to west during the Yanshanian.     

论中国含油气区的构造环境性质、分区及其成油气专属性

在前中生代,形成了华北、扬子和塔里木等较大的海相及海陆交互相含油气区（盆地）,构造格架呈南北分异。经海西-印支运动,形成统一的中国大陆板块,且整体构造格架演变为东西分异。根据盆地结构、构造变形样式、岩浆活动、地温场、壳幔结构及壳幔连通程度等方面的特征,论述了中、新生代中国含油气区的大地构造环境性质与含油气特征。据此划分出 4个具有不同构造环境性质的含油气区：①东部裂谷伸展区,其西带为华夏裂谷系,以产下第三系和白垩系原油为主,东带为大陆架裂谷系,以产下第三系煤型气为主;②中部克拉通构造稳定区,以产古生界天然气为主;③西北构造反转区,含油气层系较多,油气成因类型也多样;④特提斯碰撞-走滑区,构造变形复杂,部分地区具有较好的油气资源前景。进一步讨论了油气形成的"构造环境专属性"问题。     

ANALYSIS ON WAVELET POWER SPECTRUM OF WARM AND COLD EVENTS IN THE NI?O REGIONS

We statistically analyze the tropical typhoon forming in the South China Sea and use TC (Tropical Cyclone) for short in the following) by typhoon yearbook. The typhoon quantity is very different in different months and years. TC appears in all months except March, and the most TC quantity in a year is 11, the least is 1 and 6.2 on average. The most TC quantity in a month is 5 and the least is 0. TC lands most in August and no TC lands on Chinese continent from December to the following April. The primary landing area is between Shantou and Hainan Island. The sustaining period of TC is usually between 4 days to 7days, and the longest is 19 days. Only 15% of the TC forming in the South China Sea can intensify to typhoon, and they all form in the ocean area deeper than 150m. The South China Sea is the ocean area over which the TC occurs frequently.     

Advective heat transfer and fabric development in a shallow crustal intrusive granite — the case of Proterozoic Vellaturu granite,south India

Syntectonic plutons emplaced in shallow crust often contain intermediate-to low-temperature deformation microstructures but lack a high-temperature, subsolidus deformation fabric, although the relict magmatic fabric is preserved. The Proterozoic Vellaturu granite emplaced at the eastern margin of the northern Nallamalai fold belt, south India during the late phase of regional deformation has a common occurrence of intermediate-to low-temperature deformation fabric, superimposed over magmatic fabric with an internally complex pattern. But high-T subsolidus deformation microstructure and fabric are absent in this pluton. The main crystal plastic deformation and fluid enhanced reaction softening was concentrated along the margin of the granite body. Resulting granite mylonites show Y-maximum c-axis fabric in completely recrystallized quartz ribbonds, dynamic recrystallization of perthites, and myrmekite indicative of fabric development under intermediate temperature (∼ 500–400°C). The weakly-deformed interior shows myrmekite, feldspar microfracturing and limited bulging recrystallization of quartz. The abundance of prism subgrain boundaries is indicative of continuing deformation through low-temperature (∼ 300°C). The relative rates of cooling influenced by advective heat transfer and deformation of the pluton seem to control the overall subsolidus fabric development. The rapid advective heat transfer from the interior in the early stages of subsolidus cooling was followed by slow cooling through intermediate temperature window as a well-developed phyllosilicate rich mylonitic skin around the granite body slowed down conductive heat loss. Low-T crystal plastic deformation of quartz was effected at a late stage of cooling and deformation of the shallow crustal granite body emplaced within the greenschist facies Nallamlai rocks.     

Magmatic structures in the Krkonoše–Jizera Plutonic Complex,Bohemian Massif: evidence for localized multiphase flow and small-scale thermal–mechanical instabilities in a granitic magma chamber

The present paper examines magmatic structures in the Jizera and Liberec granites of the Krkonoše–Jizera Plutonic Complex, Bohemian Massif. The magmatic structures are here interpreted to preserve direct field evidence for highly localized magma flow and other processes in crystal-rich mushes, and to capture the evolution of physical processes in an ancient granitic magma chamber. We propose that after chamber-wide mixing and hybridization, as suggested by recent petrological studies, laminar magma flow became highly localized to weaker channel-like domains within the higher-strength crystal framework. Mafic schlieren formed at flow rims, and their formation presumably involved gravitational settling and velocity gradient flow sorting coupled with interstitial melt escape. Local thermal or compositional convection may have resulted in the formation of vertical schlieren tubes and ladder dikes whereas subhorizontal tubes or channels formed during flow driven by lateral gradients in magma pressure. After the cessation or deceleration of channel flow, gravity-driven processes (settling of crystals and enclaves, gravitational differentiation, development of downward dripping instabilities), accompanied by compaction, filter pressing and melt segregation, dominated in the crystal mush within the flow channels. Subsequently, magmatic folds developed in schlieren layers and the magma chamber recorded complex, late magmatic strains at high magma crystallinities. Late-stage magma pulsing into localized submagmatic cracks represents the latest events of magmatic history of the chamber prior to its final crystallization. We emphasize that the most favorable environments for the formation and preservation of magmatic structures, such as those hosted in the Jizera and Liberec granites, are slowly cooling crystal-rich mushes. Therefore, where preserved in plutons, these structures may lend strong support for a “mush model” of magmatic systems.     

湘中锡矿山式锑矿成矿地质条件分析

湘中锡矿山式锑矿形成于晚白垩-古新世,空间上与岩脉关系密切,各锑矿床、矿化点都伴有或附近发育有煌斑岩及中-酸性岩脉群,在锑矿成矿同期地质事件中,还有周缘一些中-新生代红色盆地的形成及基性火山岩喷发,据之,提出湘中锡矿山式锑矿成矿与燕山晚期拉张构造-岩浆活化作用有关.锑矿床(点)基本上都产出于两组或两组以上断裂的交汇点附近,3组断裂的交汇部位对应于最主要的锑矿床(点).矿体具体受断裂交汇部位附近的次级短轴背斜轴部、倾伏背斜的倾伏端及其翼部被纵向陡倾角断裂构造所切穿的部位控制,是断裂导矿与背斜构造圈闭的体现.岩性组合控矿表现为易于硅化蚀变交代的砂质碳酸盐岩与隔挡层泥质岩所构成的岩性圈闭.根据包裹体均-温度和盐度测定成果,推算成矿压力为(200～300)×10⁵Pa,成矿深度约为1 km.