Petrogenesis and dating of the Kangding complex,Sichuan Province   总被引：18，自引：1，他引：17  

CHEN Yuelong  LUO Zhaohua  ZHAO Junxiang  LI Zhihong  ZHANG Hongfei & SONG Biao . Faculty of Earth Sciences  Natural Resources  China University of Geosciences  Beijing  China  . Faculty of Earth Sciences  China University of Geosciences  Wuhan  China  . Beijing SHRIMP Center  Institute of Geology  Chinese Academy of Geological Sciences  Beijing  China 《中国科学D辑(英文版)》2005,48(5):622-634

The Kangding group, also known as the Kangding complex, includes granulites, amphibolites, felsic gneisses and gneissic granites that are distributed along a belt from Kangding, Mianning to Panzhihua, in Sichuan Province. The complex has long been thought to represent the crystalline basement of the Yangtze block. On the basis of U-Pb and Pb-Pb whole rock ages[1,2] , and of similarities in metamorphic fa-cies and association of metamorphic rocks with typical Archean high grade terrains, t…  相似文献   

The Higo metamorphic complex in Kyushu, Japan as the fragment of Permo–Triassic metamorphic complexes in East Asia     

Y. Osanai  M. Owada  A. Kamei  T. Hamamoto  H. Kagami  T. Toyoshima  N. Nakano  T.N. Nam 《Gondwana Research》2006,9(1-2):152

The Higo terrane in west-central Kyushu Island, southwest Japan consists from north to south of the Manotani, Higo and Ryuhozan metamorphic complexes, which are intruded by the Higo plutonic complex (Miyanohara tonalite and Shiraishino granodiorite).The Higo and Manotani metamorphic complexes indicate an imbricate crustal section in which a sequence of metamorphic rocks with increasing metamorphic grade from high (northern part) to low (southern part) structural levels is exposed. The metamorphic rocks in these complexes can be divided into five metamorphic zones (zone A to zone E) from top to base (i.e., from north to south) on the basis of mineral parageneses of pelitic rocks. Greenschist-facies mineral assemblages in zone A (the Manotani metamorphic complex) give way to amphibolite-facies assemblages in zones B, C and D, which in turn are replaced by granulite-facies assemblages in zone E of the Higo metamorphic complex. The highest-grade part of the complex (zone E) indicates peak P–T conditions of ca. 720 MPa and ca. 870 °C. In addition highly aluminous Spr-bearing granulites and related high-temperature metamorphic rocks occur as blocks in peridotite intrusions and show UHT-metamorphic conditions of ca. 900 MPa and ca. 950 °C. The prograde and retrograde P–T evolution paths of the Higo and Manotani metamorphic complexes are estimated using reaction textures, mineral inclusion analyses and mineral chemistries, especially in zones A and D, which show a clockwise P–T path from Lws-including Pmp–Act field to Act–Chl–Epi field in zone A and St–Ky field to And field through Sil field in zone D.The Higo metamorphic complex has been traditionally considered to be the western-end of the Ryoke metamorphic belt in the Japanese Islands or part of the Kurosegawa–Paleo Ryoke terrane in south-west Japan. However, recent detailed studies including Permo–Triassic age (ca. 250 Ma) determinations from this complex indicate a close relationship with the high-grade metamorphic terranes in eastern-most Asia (e.g., north Dabie terrane) with similar metamorphic and igneous characteristics, protolith assembly, and metamorphic and igneous ages. The north Dabie high-grade terrane as a collisional metamorphic zone between the North China and the South China cratons could be extended to the N-NE along the transcurrent fault (Tan-Lu Fault) as the Sulu belt in Shandong Peninsula and the Imjingang belt in Korean Peninsula. The Higo and Manotani metamorphic complexes as well as the Hida–Oki terrane in Japan would also have belonged to this type of collisional terrane and then experienced a top-to-the-south displacement with forming a regional nappe structure before the intrusion of younger Shiraishino granodiorite (ca. 120 Ma).  相似文献   

Complex component analysis of shear-wave splitting: case studies   总被引：1，自引：0，他引：1  

Xiang-Yang Li  Stuart Crampin 《Geophysical Journal International》1991,107(3):605-613

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A Method for locating Singularities in the Complex Time Domain for Integrable Dynamical Systems     

C. Polymilis  G. Rowlands  A. N. Yannacopoulos 《Celestial Mechanics and Dynamical Astronomy》1997,68(4):273-281

A simple method for the determination of the position of singularities in the complex time domain for dynamical systems which are described by ordinary differential equations is presented. The method is designed for integrable separable systems whose solutions are not expressible in closed form. A direct consequence of this method is that it ‘closes’ the phase space. Simple physical meaning is given to the singularity position. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

电提取中金的配阴离子运动分析及找矿机理   总被引：3，自引：2，他引：1  

王文龙  王小牛 《黄金地质》2000,6(1):60-64

从金离子在自然界的存在形式入手,分析了金的配阴离子在电场力作用下的运动形式,把金的配阴离子的运动分为４个区：配阴离子化学及电化学离解区;配服离子被电场力离解区;配阴离子被电场力离解了,但金离了无法作定向运动的非漂移区;配阴离子漂移或热运动区。提出了”本征提取域“概念,最后应用此概念讨论了４种情况下电提取离子法找金时异常形成的机理及其找矿优势。  相似文献   

中国陆相复杂含油气系统的特征   总被引：2，自引：0，他引：2  

瞿辉  张明利 《地质力学学报》2000,6(2):11-16

含油气系统研究是当今石油地质界最为热门的研究课题之一,在油气勘探中日愈发挥重要作用。在中国陆相多旋回族合叠加型盆地背景下的含油气系统多表现为复杂的多源多灶多期生烃和成藏。这种复杂的含油气系统有３个较突出的特点：（１）多源多灶致系统叠置和交叉;（２）多阶段多期生烃、成藏和变动导致多源混生;（３）多个关键时刻。在复杂含油气系统的演化过程中,常有多期大规模的油气运移过程,因上顷研究过程中要重视过程的恢复  相似文献   

新疆西天山那拉提构造带变质核部杂岩地质构造特征     

高鹏  王宏运  倪新元  李兵  胡志军  王耀武 《陕西地质》2005,23(2):61-69

新疆西天山那拉提构造带变质核部杂岩分布于新疆巩留县那拉提山山脊北侧，整体沿那位提南缘构造带北侧呈近东西向展布，为一套由高级变质表壳岩、灰色片麻岩组成的早前寒武系高级片麻岩系，历经多期不同构造体制变形变质改造与再造，形成多相片麻岩系，并呈长垣状变质核部杂岩隆升，构成那拉提造山带的核部构造物质组成。  相似文献   

梯度法解释复杂二维断裂重力异常   总被引：2，自引：0，他引：2  

魏伟  刘天佑 《物探与化探》2005,29(4):347-350

对以往的二维断裂重力异常的梯度解释方法作了几点改进:①采用最小二乘拟合方法求取台阶倾角α;②直接利用台阶倾角与台阶的水平边界位置来计算台阶的埋深;③将重力二维梯度解释方法推广到复杂断裂模型的解释。文中详细论述了这种方法的原理, 给出了其具体实现步骤。该方法比起以往重力梯度解释方法, 应用更加简便而且解释结果更加稳定。用该法成功地解释了某油气盆地的实测重力资料。  相似文献   

雅拉香波穹隆韧性剪切带变形特征与剪切作用类型研究   总被引：1，自引：0，他引：1  

张波  张进江  郭磊 《新疆地质》2005,23(1):4-9

雅拉香波变质核杂岩位于北喜马拉雅穹隆带东端，其拆离断层系的糜棱岩带构成了杂岩核部的外缘，带内主要变形岩石类型为石榴石千糜岩、糜棱状片麻岩和糜棱状花岗岩．糜棱状岩石中宏、微观韧性变形组构丰富，暗示区内存在多种显微变形机制：物质扩散迁移、晶内脆性破裂、粒内滑动及粒间滑动等，3种运动学涡度统计和计算结果表明：雅拉香波变质核杂岩拆离系的剪切作用类型是以简单剪切作为主的一般剪切；剪切带厚度变化为76％左右，属于减薄型：后期纯剪切应变速率比早期的有所增强，这可能与杂岩体核部岩浆岩后期上侵增强，穹隆进一步抬升和脆性垮塌下滑作用相关．  相似文献   

保定西部地区贵金属及有色金属矿床成矿地质特征及控矿因素分析     

刘志明  袁志林 《矿产与地质》2005,19(2):134-139

在总结保定西部地区有色金属及贵金属矿床成矿地质特征的基础上，分析了这些矿床与上黄旗-乌龙沟、紫荆关-灵山两大深大断裂以及受深大断裂控制的NE向展布的岩浆岩带的关系，提出了区内矿床集中分布于杂岩体的低角度的舌状突出部位和近SN向断裂与近EW向断裂交汇处锐角区域的观点，并对该区的控矿因素作了全面分析，指出了今后的找矿方向。  相似文献