收藏 | 手机打开


【摘要】:The high-grade metamorphic Hengshanterrain in the northern part of the Shanxi Provinceis located at the centre of the North ChinaCarton. Itis a typical exposed crustal cross sectionof the middle to lower crust of the early Preca-mbrian metamorphic terrain in the Wutaishan-Hengshan-Datong-Jining region. The amphibolite to granulite facies Hengshangneisses consist mainly of the TTG gneissesand supracrustal rocks by adding of mantlematerials horizontally. The supracrustal rocksare composed of the mafic volcanic rocksand sedimentary rocks. The plenty ofgranitoid magma activities in the region maybe a result of anatexes. The sub-horizontal ductile shearing was acco-mpanied by an underplating of mafic-ultramaficmagma. The mafic-ultramafic rocks are alsosubjectedto granulite facies metamorphism (IBCtype). The tectonic style (Hengshan type) of asubhorizontal ductile shearing deformationexhibits characteristics of four layers framework:the supracrustal sequence free of early strongdeformation, the supracrustal sequence undergoneearly strong deformation, the straight gneisses,and the oval-typed gneisses. Separated bydetachment zone, the upper two parts similitudea hanging plate, and the lower two parts is likea footwall plate of the metamorphic core in thetwo-layer configuration of metamorphic corecomplexes. 1. Supracrustal sequence free of earlystrong deformation The early deformation of the JingangkuFormation of the Wutai Group in the HengshanMountains formed a foliation( S1) parallel tobedding ( S0) . It is characterized by gneissosityand schistosity, and intraformational and intrafolialfolds occasionally. The early deformation of thesub-horizontal ductile shearing is developedweakly in the WutaiGroup. The orientation ofthe shear movement is NNW-SEE. 2. Supracrustal sequence undergoneearly strong deformation The lower part of the Jingangku Formation,Wutai Group, in the Hengshan Mountain under-gone an early stronger deformation has a lot offelsic laminae parallel to gneissosity and ischaracterized by augen, banded and laminarstructures, flow folds and intraformationalrecumbent folds various in size, which are mostlyA-type fold with the hinge of fold pallalal tothe stretching lineation. They reflect an obviousfeature of the horizontal structure transpositionwhich is the result of sub-horizontal shearing.They may be acted as a middle crust ductileflow layer. It is suggested that the stratigraphicsequence as a whole is only slightly influencedby these deformation . 3. Detachment zone sequence of the Jingangku Formation and theHengshan straight gneisses is a detachment zone.It is different types of rocks or strata of theJingangkuformation in the Hengshan and WutaiMountains that are generally overlaid on theHengshangrey gneisses. It is a discontinuousplane between the grey gneisses and the JingangkuFormationundergone later strong deformations,especiallyas a sub-horizontal ductile shear zone.The detachment zone exhibits the characteristicsof a largearea lower angular normal fault.4. Straight gneissesUnder the Wutai Group in the Hengshan-Wutai-Fuping areas, there is generally a zone ofstraight gneisses from several kilometers tomore than ten kilometers in thickness. It wasformerlycalled the Qianzhuangwang and Dian-fangtai Formation in Hengshan, the LongquanguanGroup andYulinping Formation in Fuping. Thestraight gneisses have a straight gneissositybearing a few, fine and straight felsic streaks, withstrong stretching lineation, equigranular andfiner grain size ( 1mm±), and no or weaklypreferred crystallographic orientation whichindicateanorigin of superplastic flow mechanism.5. Thearea of oval-typed gneissesThe main parts of the Hengshan grey gneissesare the oval-typed gneiss area. The alternatedistribution of stronger strain zones and weakerstrain domains shows a feature of irregular ovaland dome-shaped style on the surface, and ananastomosing pattern on the cross-sections. Itinfers three dimensional tectonic frameworksand styles of the strong strain zones and theweaker strain domains formed by sub-horizontalductile shearing. The Hengshan oval-typedgneisses are mainly augen, layering and strippedgneisses, which are formed by the adding ofmafic intrusive rocks of mantle origin andmaterials of part-melting and auto-differentiationof rocks as the result of a dilatation structuresparallel to shear zone boundary. These dilatationveins were ultramafic-mafic intrusive sheets inthe early stage, and were suffered strongboudinages and shearing in the later deformationalstage forming , , type porphyroclastssystems, and appear as a seriesof deformationzones with different sizes generally. The featuresof the leucocratic felsic veins in the middle stageand the pink granitoid veins in the later stagereflect an evolution process ofgneisses fromgneisses from deep tectonic facies to the middletectonic facies. There is a stretching lineationdeveloped in the strong deformation gneisses andmafic rocks. The deformation behavous of horn-blendes and plagioclases of thegneisses showsthat it might be the characteristics of superplasticflow mechanisms. The boudinages appear aschocolate-tablet typewith very strong extentionon sub-horizontal plane. Aseries of movementsenses showed by the boudinages andporphyroclasts of the mafic rocks are developedin the scale from hand specimen, outcrops to morelarge size. There areflow fold layers, intrafo-rmational folds and shearth folds reflectinghorizontal transposition in the gneisses. Thevarious movement senses indicatethe hanging-wallmoving down towards SEE direction. The featuresof the sinistral and dextral shearing towards NEor SW direction have found in a few part in thenorthern part of Hengshan.Consequently, the Hengshan amphibolite-granulite facies metamorphic terrain regardingas a transition zone between the middle crust andlower crust is a giant broaden ductile shear zonewith characteristics of superplasticflow mechanism.The amphibolite facies Wutai Group is madeThe contact between the supracrustal up of mafic volcanic rocks and sedimentaryrocks. Itis deformed as a bundle of cylindricalfolds striking NEE with the axial plane dippingto S at the southern parts of Hengshan. Thetectonic framework of the Hengshan-Wutaishanterrain isa huge fan-typed anticlinorium (socalled theWutai type) with large-scale magmaactivities,metamorphism (ITD type) and anatexes.It is suggested that this is a collision orogenicbelt of Wutaishan at 2 500Ma which formed anArcheancraton in the North China. This may bethe earliest surpracontinent convergent event. Itrepresents a middle crust tectonic modal of theNorth China Craton in early Precambrian.The tectonic style of the Hutuo Group mainlyconsisting of sedimentary rocks in the WutaiMountains is a huge invert-fan synclinorium(so called the Hutuo type). It illustrates thematerial components of the upper crust and theintra-continental orogenesis, and may be acted asa model of the tectonic-magma event in theworld at 2 200~1 800Ma whichwould be a newresearching hot spot after Rodinia.It is suggested that the Wutaishan, Hengshanand Fuping areas can be divided into three(Hengshan-Fuping,Wutaishan and Hutuo)structural layers and two geotectonic units bycomprehensive studies on structures, petrology,geochemistry, metamorphism andgeochronology.Two geotectonic units are divided by the NNW-NEE structural zones, i.e. the Hengshan-Fupingblock to the NE and the Wutai block to the SW,accordinly, the North China Craton may alsodivided as the NE and SW blocks.On the basisof geological events occurred in the Hengshanand adjacent area, its crustal evolution can bedescribed as formation of continental cores in theMesoarchean, passive continental margin/volcanic arc (flych) and collision orogene inthe Neoarchean, Paleoproterozoicrift, Paleoproterozoic continental orogen and break-up of rigidicplate in the Mesoproterozoic stages.

中国期刊全文数据库 前20条
1 马涛;宋传中;任升莲;李加好;刘欢;由夏冰;;肥东低角度韧性剪切带内岩石变形特征[J];合肥工业大学学报(自然科学版);2015年02期
2 聂江涛;魏刚锋;姜修道;李赛赛;任金彬;任华;;煎茶岭韧性剪切带的厘定及其地质意义[J];大地构造与成矿学;2010年01期
3 裴利庭,杨敏,马国玺,郝太平,宾金来,韩志宏;龙泉关韧性剪切带地质特征[J];北京地质;2001年01期
4 邵铁全,刘云焕,董玉书;新疆尾亚韧性剪切带的基本特征及其意义[J];西安工程学院学报;2001年04期
5 赵玉灵,杨金中;胶东蓬家夼韧性剪切带的特征及其与金矿化的关系[J];黄金;2000年08期
6 于海峰,梅华林,李铨,左国朝;甘肃北山南带巨型韧性剪切带一条大型金矿成矿带[J];中国地质;1998年03期
7 胡玲;韧性剪切带研究现状及发展趋势[J];地质力学学报;1996年03期
8 郭进京;早前寒武纪多期变质变形区主期韧性剪切带[J];中国区域地质;1994年01期
9 毛奕坤;江西暖水地区韧性剪切带的基本特征和形变机制初探[J];江西地质;1994年03期
10 侯泉林,李继亮,孙枢,李培军;浅层次微型韧性剪切带的发现及其形成机理讨论[J];科学通报;1995年07期
11 苗培森,张振福;不同构造机制韧性剪切带研究[J];中国区域地质;1995年04期
12 熊清华;周良忠;邹赣生;黄志忠;;雅鲁藏布江中段发现两条巨大的韧性剪切带[J];中国区域地质;1992年03期
13 汤家富;肖庆辉;;武功山东段韧性剪切带的变形特征和形成机制[J];地质论评;1987年02期
14 金鹤生;胡交平;伍意得;;界牌—马迹韧性剪切带的初步研究[J];湖南地质;1987年04期
15 何永年,史兰斌,林传勇;韧性剪切带及其变形岩石[J];地震地质;1988年04期
16 肖诗兴;闽—粤东南沿海大陆边缘韧性剪切带的基本特征[J];现代地质;1988年01期
17 陶建华;;政和—大埔断裂中段韧性剪切带特征[J];福建地质;1988年03期
18 王汉霞;李世涛;;辽宁西部两条大型韧性剪切带及其地质意义[J];辽宁地质;1988年03期
19 王驹;;韧性剪切带、金矿、裂谷作用——华南元古宙会议的三个热门话题[J];铀矿地质;1988年03期
20 张家声;索书田;;华北北部结晶基底中的大型韧性剪切带[J];中国区域地质;1988年04期
中国重要会议论文全文数据库 前10条
1 徐德明;翟淳;王国芝;;河南信阳龟山韧性剪切带变形组分及迁移特征[A];中国地质科学院宜昌地质矿产研究所文集(20)[C];1995年
2 杨志华;李勇;苏春乾;郭俊锋;;纪念相对论发表100周年:鞘褶皱式结构和运动方式的普遍性及生命动力学[A];中生代以来中国大陆板块作用过程学术研讨会论文摘要集[C];2005年
3 许志琴;张建新;;中国主要大型韧性剪切带及动力学研究进展[A];中国地质科学院地质研究所文集(27)[C];1994年
4 蔡学林;曹家敏;朱介寿;程先琼;;中国大陆岩石圈壳幔韧性剪切带系统[A];中国地球物理学会第22届年会论文集[C];2006年
5 黄诚;徐增连;徐春霞;;湘东北大瑶地区雁林寺韧性剪切带特征与金成矿[A];第八届全国成矿理论与找矿方法学术讨论会论文摘要文集[C];2017年
6 母润昌;高平;刘若新;马宝林;;高温高压下华北地壳韧性剪切带岩石波速各向异性实验研究[A];1992年中国地球物理学会第八届学术年会论文集[C];1992年
7 徐先兵;汤帅;林寿发;;赣北景德镇韧性剪切带的两类剪切指向及其构造意义[A];2016中国地球科学联合学术年会论文集(七)——专题15:中央造山系构造演化、专题16:华南大陆构造、专题17:中亚造山带与成矿[C];2016年
8 戚学祥;李海兵;吴才来;陈松永;;北阿尔金巴什考供韧性剪切带韧性剪切变形对岩石地球化学行为的制约[A];2004年全国岩石学与地球动力学研讨会论文摘要集[C];2004年
9 刘一鸣;李才;解超明;王明;吴彦旺;胡培远;;羌塘中部长梁山韧性剪切带的变形特征及其构造意义[A];2014年中国地球科学联合学术年会——专题36:羌塘-三江特提斯造山带形成演化与成矿效应论文集[C];2014年
10 王新社;郑亚东;王涛;;三维变形分析及其在楼子店韧性剪切带中的应用[A];构造地质学新理论与新方法学术研讨会论文摘要集[C];2006年
中国博士学位论文全文数据库 前10条
1 王超;吉黑东部中生代早中期火成岩研究及其构造意义[D];吉林大学;2018年
2 苗培森;恒山中深变质岩区构造样式[D];中国地质大学(北京);2001年
3 陈昌明;皖南地区大型韧性剪切带及其与金成矿作用关系研究[D];中国地质大学;2016年
4 孟元库;藏南冈底斯中段南缘构造演化[D];中国地质科学院;2016年
5 付于真;西秦岭八卦庙和丁马含金剪切带构造地球化学对比研究[D];中国地质大学(北京);2015年
6 徐先兵;武夷山地区显生宙构造变形与年代学研究[D];南京大学;2011年
7 丁仨平;西秦岭—祁连造山带(东段)交接部位早古生代构造格架及构造演化[D];长安大学;2008年
8 陆关祥;造山带复杂结构构造区遥感——构造综合解析[D];西北大学;2002年
9 黄始琪;东北地块南北缘中生代构造变形与演化[D];中国地质科学院;2013年
10 公王斌;华北克拉通西部古元古代末构造变形特征及意义[D];中国地质科学院;2014年
中国硕士学位论文全文数据库 前10条
1 刘庆;辽西兴城台里地区韧性剪切带北段构造变形特征研究[D];吉林大学;2018年
2 张健;南秦岭石泉—旬阳金矿带安康茨沟—早阳金矿区脆—韧性剪切带特征与找矿方向建议[D];长安大学;2018年
3 王晓青;内蒙古熬汉旗岱王山金矿地质特征与控矿构造[D];长安大学;2018年
4 王浪;班达水电站坝址区韧性剪切带和蚀变带发育特征及其对边坡稳定性的影响[D];成都理工大学;2018年
5 高勇;内蒙古北山地区公路井—三个井韧性剪切带厘定及地质意义[D];中国地质大学(北京);2018年
6 李辉;宁夏石嘴山市北岔沟地区金矿地质特征及找矿远景分析[D];中国地质大学(北京);2018年
7 王浩然;内蒙古四子王旗小乌兰花韧性剪切带变形特征及构造意义[D];中国地质大学(北京);2012年
8 董浩强;新疆若羌县白山地区韧性剪切带的变形特征分析[D];中国地质大学(北京);2018年
9 刘绍昌;内蒙古狼山地区韧性剪切带构造特征研究[D];昆明理工大学;2015年
10 楚泽松;皖南休宁九亩丘矿区韧性剪切带特征与金矿成矿关系[D];中国地质大学(北京);2017年
中国重要报纸全文数据库 前4条
1 本报记者 高建进 通讯员 林文泰;白云山古冰川活动形成韧性剪切带被发现[N];光明日报;2008年
2 记者 许含宇 通讯员 林文泰;福大教授获重大地质发现[N];福州日报;2008年
3 艾海平;把构造、岩石、地球化学等多学科结合起来[N];中国矿业报;2010年
4 陈明;黑龙江1:5万区调项目取得阶段性成果[N];中国矿业报;2007年
 快捷付款方式  订购知网充值卡  订购热线  帮助中心
  • 400-819-9993
  • 010-62982499
  • 010-62783978