天山之火山岩

(一)导言天山地质数十年来不断经中外地质学家之调查与研究,大体上已逐渐明瞭。就各方面研究之成果及笔者自身调查之结果探讨之,天山区内所发现之多数复杂岩流,其喷发活动显非一期。同时各期火山岩之性质,分布与夫所受到之变质作用亦不     

自贡世界地质公园风光

自贡世界地质公园位于四川省自贡市，主要由三大园区组成，包括大山铺恐龙化石群遗迹园区、自贡盐业科技园区、荣县青龙山恐龙化石群遗迹园区，设置科考科研区、科普游览区、生态观光区、探幽访古区等功能区和一系列功能小区.自贡大山铺恐龙化石群是1．6亿年前的中侏罗世恐龙及其它脊椎动物化石的遗址，填补了恐龙演化史上这一时期恐龙化石匮乏的空白，     

中咀湾避风港工程波浪分析及其应用

中咀湾是一个天然的避风良港,一般情况下外海波浪影响很小,主要受局部风场产生的局部风浪影响。本文采用曹宏生在Massel的扩展缓坡方程基础上推导出来的考虑陡变地形和能量耗散效应的缓坡方程为控制方程,结合固边界的反射边界条件,构成波浪传播变形的联合折射、绕射和反射的数学模型。文中将此方法运用在中国台州市大陈岛中咀湾避风港中,用波浪数学模型计算极端高水位和设计高水位时3种波况分别在3组重现期时工程海域的波浪要素,提供防波堤的堤前波高,并分析比较此处实心式和透空式防波堤的防浪性能。     

On tectonic movement in the South China Sea during the Cenozoic

The tectonic movement taking place at the end of Cretaceous and the beginning of Cenozoic had opened the Cenozoic phase of polycyclic tectonic movements, then the whole crust of the South China Sea had been mainly subjected to the regional stress field of tectonic tension, which was characterized by rifting depression. Seven times of regional tectonic movement and sedimentation had been assembled into a geological development history of polycyclic oscillation. Especially, the tectonic movements were strongly intensified at the end of Cretacious and the beginning of Paleagene, between Late Eocene and MidOligocene, during Mid and Late Miocene. These three times of tectonic movement had built the most important regional tectonic interfaces in the South China Sea. Crust movements of the South China Sea were the result and epitome of interaction of the Eurasia, Pacific and IndoAustralia plates, that is, they were introduced by polycyclic changes of directions, rates and strengths of lithospheric movements and asthenospheric flows across the Pacific and IndoAustralia plates.     

桂西百逢组微细粒浸染型金矿床成因探讨

桂西广泛分布的中三叠统百逢组在桂西微细粒浸染型金矿含矿层位中占主导地位.文章以实例论证了含矿层为百逢组的金矿床成因,指出其不仅仅是地层(层控)成因,而是地层(层控)与断裂构造动力热液共同作用所形成.且不同的矿床其主导因素不尽相同.     

Late Paleozoic tectonic evolution in northern Korean Peninsula

Since Late Proterozoic era, the Korean Peninsula has been evolved into a state with relatively stable regions and orogenic belts which were developed differently each other. The Late Paleozoie （Late Carboniferous-Early Triassic） sediments are well developed in the Korean Peninsula, and called the Pyongan System. The Pyongan System from Late Carboniferous to Lower Triassic is distributed in the Pyongnan and Hyesan-Riwon Basins, and Rangrim Massif, and divided into Hongjom （ C2 ）, Ripsok （ C2 ）, Sadong （ C2-P1 ）, Kobangsan and Rokam （Taezhawon） （P2-T1） sequences. The sediments of the Tumangang Orogenic Belt are called Tuman System which is composed of the Amgi Series, consisting of elastic formation with mafic effusive material, overlaid by the Kyeryongsan Series, consisting mainly of marie volcano sediments. The Songsang Series which rests on the Kyeryongsan Series mainly consists of elastic formation with minor felsic effusive material. In the Tumangang Orogenic Belt the tectonic movement, called Tumangang Tectonic Movement, occurred in the Lower Permian-Lower Triassic.     

大兴安岭塔河县盘古河上游地区地质背景及多金属成矿条件分析

一、区域地质背景 1．地层 本区地层出露比较齐全，岩性复杂。主要有新元古界——下寒武统倭勒根群吉祥沟组和大网子组、中生界上侏罗统吉祥峰组、下白垩统光华组和甘河组、第四系全新统。     

陕西省商南县湘河地区钒矿成矿特征及成因

通过野外地质调查和室内岩石学、岩石化学、稀土及微量元素地球化学分析,深入研究了陕西省商南县湘河地区钒矿床的成矿特征,并探讨了该类矿床的成因.研究结果表明,该区钒矿主要产出于青石峡-余家台倒转复式向斜两翼下寒武统水沟口组下岩段硅质岩夹泥岩的泥岩中,矿体产状与地层产状基本一致;钒矿床中所有岩石都含有较高的SiO2,硅质岩以隐晶质石英和玉髓为主,有沉积成因重晶石;V与Cr、U、Ba相关性好;稀土元素球粒陨石标准化模式具有或正或负的Ce异常和明显的Eu正异常、向右倾的图形.上述特征都反映出该地区钒矿床具有典型的海底热水流体特征,此类钒矿床可称之为海底热水(喷流)沉积矿床.     

霍吉河铜及多金属矿找矿规律初探

一、地质特征 1．地层 出露有晚二叠统五道岭组弱变质流纹岩及中基性火山岩，下白垩统宁远村组、中酸性火山岩和板子房组中基性火山岩。     

基于微地震技术的油田裂缝监测及模拟

研制了1套以三分量MEMS检波器为核心硬件的微地震监测系统,并结合GPS系统对监测过程进行精确授时.同时编制数据化记录和处理软件,实现网络化自动监测功能;通过开发计算机判别标准和实时定位理论系统,对数据和微震源进行自动化处理和计算.利用该系统对东辛油田营11进行了6个月现场注水微震监测,对监测数据的处理表明营11注水区域裂缝发育方向基本上为NE90°-NE125°,与地应力裂缝模拟结果相符较好,两者结合给出了这个地区合理开发部署建议.