Metallogeny of Shoshonite-Hosted Copper-Gold Deposits in Middle-South Parts of Tancheng-Lujiang Deep Fault Zone and Its Vicinity,Eastern China     

Qiu Jiansheng  Wang Dezi  Ren Qijiang 《中国地质大学学报(英文版)》1999,10(1):47-50

ＩＮＴＲＯＤＵＣＴＩＯＮＳｈｏｓｈｏｎｉｔｅｓａｒｅｐｏｔａｓｓｉｃｉｇｎｅｏｕｓｒｏｃｋｓｗｈｉｃｈｏｃｃｕｒｍａｉｎ－ｌｙｉｎｓｕｂｄｕｃｔｉｏｎ－ｒｅｌａｔｅｄｔｅｃｔｏｎｉｃｓｅｔｔｉｎｇｓ（Ｍｏｒｒｉｓｏｎ,１９８０）．Ｔｈｅｙａｒｅｃｏｍ...  相似文献   

浅析吉林省大横路钴铜矿床成矿条件   总被引：4，自引：0，他引：4  

万丛礼  刘荣访 《世界地质》1999,18(1):21-24

吉林省大横路钴铜矿床赋存于辽吉旱元古宙裂谷中段,老岭背斜的南翼,具体层位为老岭群大栗子组的中部岩性段。属于一套浅变质岩系。该岩系由于受构造作用影响产生了明显的断裂和褶皱。特别是褶皱核部及转折端,是矿体聚集的重要空间,矿体形态产状与褶皱形态基本一致。  相似文献   

新疆小热泉子铜(锌)矿床同位素研究   总被引：10，自引：0，他引：10  

陈文明 《地球学报》1999,20(4):349-356

小热泉子矿床是我国最近发现的一个中型富铜( 锌) 矿床,其矿床成因为众多的矿床学家所关注。本文对该矿床中不同类型矿石、矿物的S、O、H、Si 及稀有( 惰性) 气体He、Ar 同位素特征作了较祥细的论述,同时用KAr 法对硫化物的年龄测定进行了初步尝试。该矿床硫化物的δ34S 值为+ 1-5 ‰～+ 11-1 ‰,平均为6-15 ‰(46) ;3 He/4 He( 初始) 值为5 ×10 - 8 ～2-17 ×10 - 6 ,平均为0-64 ×10 - 6(6) ,40 Ar/36Ar 值为305-27  相似文献   

成矿系统的结构与聚矿功能   总被引：8，自引：1，他引：7  

李人澍  朱华平 《地学前缘》1999,6(1):103-113

成矿系统结构对成矿动力学条件的约束与促进,引起系统固有聚矿功能的巨大变异。成矿系统动力学包括：系统运转的动力组合、系统物质运动总方向和轨迹、矿质活动空间规模形态及单位空间中成矿微过程的频度。系统结构定性分析表明：系统结构的完善程度和成矿动力学条件的优劣与系统聚矿功能的强度正相关。系统结构完善程度可由结构紧致度（Ｉ）表征,系统聚矿功能可用标准富集量（Ｑｓ）反映,它是矿床储量（Ｑ０）经成矿难度系数（Ｃ）变换的归一化指标。经结构定性半定量分析,对成矿系统聚矿功能作出初步排序,具强烈非线性成矿特征的花岗岩浆成矿系统和环流热液成矿系统的聚矿功能最高  相似文献   

论成矿系统   总被引：134，自引：14，他引：120  

翟裕生 《地学前缘》1999,6(1):13-27

成矿系统是当今矿床学研究的一个重要课题,是矿床学向系统化、全球化方向发展的一种趋势。成矿系统是指在一定地质时空域中,控制矿床形成和保存的全部地质要素和成矿作用过程,以及所形成的矿床系列和异常系列构成的整体,它是具有成矿功能的一个自然系统。成矿系统是在一般矿床成因研究的基础上,着重从宏观上,从成矿的时间、空间、物质、运动的有机结合上,探讨区域尺度的成矿规律。其研究意义是深入认识成矿动力学机制,指导矿产勘查,并有利于将成矿学信息应用到地学其它学科中去。文中还论述了成矿系统与成矿系列、成矿区带的联系和区别,对成矿系统的基本要素、作用过程、作用产物和成矿后变化及保存４个问题作了说明。提出以成矿的构造动力体制作为划分成矿系统大类的依据及以成矿机理作为划分成矿系统类型的主要标志。最后以古大陆边缘构造成矿系统为例,说明构造动力型式、构造组合与成矿系统之间的内在联系  相似文献   

北太行山—燕山区中生代金属矿床成矿系统   总被引：5，自引：1，他引：4  

石准立  刘凤山 《地学前缘》1999,6(2):297-304

太行山北段—燕山地区位于中朝板块中部及其北部边缘,以铁、铜、钼、金、银、铅、锌、铀等金属矿产为特色。中生代本区进入陆内造山作用阶段,花岗质岩浆作用及与之有关的成矿作用是克拉通活化的结果。在已研究了与花岗质岩浆作用有关的成矿系列划分、特征和控制因素等基础上,本文重点探讨了成矿系统的划分、时空结构及其控制因素,指出其作为中生代陆内造山作用的结果,明显受到两期不同成矿动力机制的控制,主要由古欧亚构造域成矿系统和西太平洋构造域成矿系统组成。根据构造应力环境,可进一步划分出５个成矿亚系统和Ⅰ～Ⅳ４个成矿系列。成矿系列或矿床具有多期性,不同时代矿床空间分布成带或集中区,三叠纪矿床主要分布于燕辽沉降带北侧,早侏罗世时以辽西为主,中侏罗世时向西扩展到冀东,晚侏罗世时则以太行—燕山西段为主,早白垩世矿床广泛分布于全区,但Ⅲ成矿系列集中等间距分布在几条ＮＷ向带中。矿床这种时空分布规律受控于中生代花岗岩类岩浆活动,而中生代造山作用决定了岩浆岩的时空分布,岩浆起源演化与成矿有关。  相似文献   

Tectonic Evolution of the Lufilian Arc (Central Africa Copper Belt) During Neoproterozoic Pan African Orogenesis   总被引：3，自引：0，他引：3  

A.B. Kampunzu  J. Cailteux 《Gondwana Research》1999,2(3):401

The Lufilian arc of Central Africa (also called Katangan belt or Copperbelt) is a zone of low to highgrade metasedimentary (and subsidiary igneous) rocks of Neoproterozoic age hosting highgrade CuCoU and PbZn mineralizations. The Lufilian arc is located between the Congo and Kalahari cratons and defines a structure which is convex to the north. Three major phases of deformation characterize the construction of the Lufilian arc. The first phase (D1) called the “Kolwezian phase” developed folds and thrust sheets with a northward transport direction. D1 deformation occurred in the Lufilian arc between ca. 800 and 710 Ma, with a peak in the range 790–750 Ma. It is here correlated with the main deformation in the Zambezi belt. Southward-verging folds with the same trends as the D₁ structures were previously linked to a second tectonic event named Kundelunguian phase of the Lufilian orogeny. We show in this paper that they are backfolds developed during D1 along Katangan ramps and especially along the Kibaran foreland. The second phase (D2) of the Lufilian orogeny is the “Monwezi phase” including several large leftlateral strikeslip faults which have been activated successively. During this deformation phase, the eastern block of the belt rotated clockwise, giving the present day NWSE trend of D1 structures in this part of the Lufilian arc, and generating its convex geometry. The Mwembeshi dislocation, the major transcurrent shear zone separating the Zambezi and Lufilian arc, was mostly active during the D2 deformation phase. D2 deformation occurred between ca. 690 and 540 Ma. Such a long time interval is attributed to the migration of strikeslip faults developed sequentially from south to north, and probably to a slow convergence velocity during the collision between the Congo and Kalahari cratons. The third phase (D3) of the Lufilian orogeny is a late event called the “Chilatembo phase”, marked by structures transverse to the trends of the Lufilian arc. This deformation and the post-D_2′ uppermost Kundelungu sequence (Ks3 Plateaux Group), are younger than 540 Ma and probably early Paleozoic.  相似文献   

Hercynian polyphase tectonics in the northeast French Massif Central: the closure of the Brévenne Devonian–Dinantian rift     

C. Leloix  M. Faure  J.-L. Feybesse 《International Journal of Earth Sciences》1999,88(3):409-421

 Field and laboratory structural studies show that the Devonian–Dinantian units of the northeast French Massif Central experienced a complex and contrasting tectonic–metamorphic evolution during the Hercynian orogeny. The structural analysis of the pre-Middle Visean Brévenne–Violay–Beaujolais rocks, in the Loire area, shows a polyphase tectonic evolution associated with greenschist to amphibolite facies metamorphism. The first event, D1, probably occurred in Early Tournaisian or Latest Devonian times. It is responsible for the flat-lying regional foliation and the NW/SE- to N/S-trending lineation. It is well observed in the Violay group and corresponds to the NW-vergent emplacement of the Late Devonian units upon their gneissic basement, represented by the Affoux gneisses. The second event, D2, is responsible for the NE/SW- to E/W-trending lineation. To the south, D2 deformation is locally reworked by the Grand-Chemin dextral wrench fault, around 345–350 Ma ago. This polyphase deformation is also found in several Devonian–Dinantian areas of the NE Massif Central, but not in Morvan. This tectonics corresponds to the Tournaisian closure, by northward thrusting and subsequent intracontinental deformation, of the oceanic Brévenne–Violay–Beaujolais rift which opened in Devonian times in a back-arc setting. Received: 4 September 1998 / Accepted: 27 May 1999  相似文献   

Precise dating of the Dansgaard-Oeschger event 4 and its sub-cycles: Evidence from a stalagmite from Xianyun Cave in Longyan City,Fujian Province     

Che Yin-Ping  Xiao Hai-Yan  Jiang Xiu-Yang  Cai Bing-Gui 《古地理学报》1999,22(2):377-384

The Dansgaard-Oeschger event 4(DO4 event) is a significant warming event that occurred in the late Marine Isotope Stage 3. At present,there are different understandings about the detailed characteristics and internal structures of the DO4 event. Based on 6 precisely-dated ²³⁰Th ages and 188 oxygen isotope data of a stalagmite(No.XYⅢ-28)from the Xianyun Cave,Fujian Province,we present δ¹⁸O time series with an average resolution of 7 yr from 29.13 to 27.94 kyr B.P. Our new stalagmites δ¹⁸O records uncover the detailed processes of the DO4 event. The onset and end time of the DO4 event recorded by the stalagmite δ¹⁸O is 28.83±0.06 and 28.46±0.06 kyr B.P.,respectively, and the duration is 0.37±0.06 kyr. Differential with abrupt change of NGRIP ice core δ¹⁸O record at the onset of DO4 based on the GICC05 layer count time scale,the Xianyun Cave δ¹⁸O shows a relatively slow change. The Xianyun stalagmite δ¹⁸O values negatively shift by 0.4‰ within 145±60 yr,which indicates that the Xianyun Cave was likely affected by the ocean-atmosphere coupling of the tropical. In addition,the Xianyun stalagmite δ¹⁸O reveals a series of sub-million-scale summer monsoon enhancement events in and around the DO4 event,corresponding to the NGRIP ice core δ¹⁸O record and the Arabian Sea basin record. Our results suggest that the East Asian summer monsoon is related to the north-high latitude temperature and the ITCZ position changes on the sub-millennium-scale event.  相似文献   

西南秦岭与西南贵州铀金成矿带及其与美国西部卡林型金矿床的类似性   总被引：19，自引：0，他引：19  

涂光炽 《铀矿地质》1990,6(6):321-325

经过野外和室内工作,作者提出,西南秦岭与西南贵州都是铀-金-汞-锑-砷(主要是雄黄雌黄,有时毒砂也重要)-铊成矿带。铀矿床的存在使这两个成矿带似乎区别于卡林成矿带,但实际上三者大同小异。本文概略讨论西南秦岭与西南贵州成矿带铀矿床与金矿床的地质背景、矿物组合、微量元素与同位素化学及成矿机制并与卡林型金矿床对比。  相似文献