西藏仁布县上三叠统朗杰学群物源分析

西藏仁布县地区上三叠统深海～半深海郎杰学群49件砂岩样品的碎屑的分选和磨圆度较差,有轻微变质作用。用Gazzi—Dickinson的计点法对碎屑组分进行估计,运用Dickinson三角图解方法,对郎杰学群进行了物源分析研究,结果显示,物源总体来自再旋回造山带和构造混合区,含有大陆基块及混合造山带砂岩成分。     

大兴安岭南部扎赉特旗团发村晚古生代沉积岩源区和时代限定

大兴安岭南部扎赉特旗地区分布着一套晚古生代地层,由砂岩、粉砂岩和泥岩组成,由于缺乏古生物化石和年代学证据,前人依据地层对比将其定为晚二叠世林西组。本次工作在详细地野外地质调查基础上,运用锆石LA-ICP-MS U-Pb测年技术,对三个砂岩样品(样品号:18TF-01、18YSL-04和18XBL-01)中的碎屑锆石进行了测定,共获得219颗碎屑锆石U-Pb年龄值,其主要分布在243~269Ma,273~298Ma,305~339Ma,350~377 Ma,445~507 Ma和754~1053 Ma六个年龄区间。其中获得最年轻的一组锆石的谐和年龄为245 Ma,并结合区域上侵入该地层花岗岩的年龄,限定其沉积时代可能为中三叠世。根据碎屑锆石的年龄值特征反映出该地层具有多物源供给的特点,其中年龄为243~269Ma的碎屑物质源区主要来自于古亚洲洋闭合及碰撞造山相关的岛弧花岗岩类;年龄为273~298 Ma主要来自于大石寨组火山岩;年龄为305~339 Ma可能主要来自于格根敖包组火山岩;350~377 Ma的碎屑锆石可能源于北部大民山组火山岩;年龄为754~1053 Ma的碎屑锆石与漠河杂岩、兴华渡口群及佳木斯微陆块中元古代的岩浆事件有关;较古老~1800 Ma的碎屑锆石可能来自于古亚洲洋中微陆块或结晶基底。砂岩中锆石的形成年龄与地层沉积年龄较为相近,显示出汇聚背景下的特征。因此,综合砂岩物质组成、锆石年龄特征及弧-盆之间时空关系,显示中三叠世该地区可能形成于汇聚背景下的弧前盆地。     

松潘-甘孜褶皱带南部上三叠统物源及构造抬升:碎屑锆石年代学和Hf同位素证据

碎屑锆石年代学不但能够限定地层沉积开始的最大时限,还能为示踪沉积物源区提供关键信息。中国西南部的松潘-甘孜褶皱带广泛出露一套巨厚的三叠纪复理石沉积,其物源区和可能存在的同期抬升与剥蚀历史并未得到很好约束。本文获得的松潘-甘孜褶皱带南部雅江地区上三叠统四套地层（由老至新分别为侏倭组、新都桥组、两河口组和雅江组）5件砂岩样品的碎屑锆石U-Pb年龄和锆石Hf同位素数据表明,最年轻锆石年龄指示侏倭组从~229Ma后开始沉积,新都桥组则从~223Ma后开始沉积。碎屑锆石年龄频谱图显示四套地层都具有中奥陶世-早泥盆世（465~398Ma）和中二叠世-晚三叠世（271~225Ma）的年龄峰。除两河口组外的其他三套地层还具有较强的古元古代（1.90~1.86Ga）和新元古代（872~712Ma）的年龄峰。锆石Hf同位素显示松潘-甘孜褶皱带南部上三叠统小于300Ma的锆石颗粒主要来自峨眉山大火成岩省和义敦岩浆弧。本文物源区示踪结果表明,华南板块和义敦地体可能为松潘-甘孜褶皱带南部地层的主要物源区。晚三叠世由于周缘地体的强烈汇聚,松潘-甘孜褶皱带在小于~18Myr的时间内经历了快速的隆升和剥蚀作用,剥蚀产生的碎屑物质被搬运至四川盆地的西缘再沉积。     

东准噶尔三塘湖盆地中侏罗统砂岩碎屑锆石U- Pb年龄、Hf同位素特征及对铀成矿的意义

三塘湖盆地汉水泉地区是东准噶尔地区砂岩型铀矿找矿的有利地段,为揭示该地区中侏罗统西山窑组和头屯河组沉积物物源体系,分析地层铀源条件,对西山窑组和头屯河组砂岩开展碎屑锆石LA- ICP- MS U- Pb测年和Hf同位素分析。分析结果显示西山窑组砂岩的碎屑锆石年龄集中于晚古生代,2个样品年龄峰值分别为328 Ma和340 Ma,碎屑锆石εHf(t)为8.9~14.7,二阶段模式年龄介于690~415 Ma之间;头屯河组砂岩的碎屑锆石年龄可划分出238~163 Ma、505~259 Ma和1950~744 Ma三个区间段,碎屑锆石εHf(t)为-6.5~12.1,二阶段模式年龄介于1709~575 Ma之间。物源分析表明西山窑组砂岩物源单一,主要来自于研究区西部卡拉麦里—麦钦乌拉和野马泉地区;头屯河组砂岩物源相对复杂,除了有来自于卡拉麦里地区的碎屑物质外,还接受了其他区域的物源供给。二者之间碎屑锆石年龄特征的突变,代表了东准噶尔地区中侏罗世一次剧烈的构造变形事件,物源特征指示汉水泉地区中侏罗统地层铀含量相对有限,铀源是限制该地区砂岩型铀矿成矿的重要因素。     

太原西山煤田骆驼脖子砂岩特征及物源区分析

为了判断太原西山煤田物源区,并探讨物源区构造背景,运用砂岩单碎屑组分法、多碎屑组分法和重矿物组合法,综合分析了七里沟剖面二叠系下石盒子组底部骆驼脖子砂岩的特征。结果表明:骆驼脖子砂岩主要组分为石英和岩屑,石英占80%以上,岩屑占10%左右,长石极少见,体积分数小于1%,且石英和岩屑成因类型以岩浆岩型和变质岩型为主,沉积岩型含量较少;重矿物主要由锆石、磷灰石和金红石组成,揭示出物源区母岩类型为酸性岩浆岩,物源区为北面阴山古陆,砂岩组分的Dickinson三角图解表明,物源区构造背景为再旋回造山带。      

松辽盆地南部钱家店铀矿床姚家组砂岩地球化学特征及地质意义

沉积物的地球化学成分在沉积岩物源分析及构造背景的研究中具有重要的作用.对研究区4口钻孔中的姚家组砂岩进行了详细的岩石学和地球化学研究,结果显示,砂岩碎屑颗粒石英含量最高,长石次之,岩屑含量最低,平均值分别为42%、37%和21%,具有锆石+钛磁铁矿+石榴子石的重矿物组合,反映源岩以酸性岩浆岩或变质岩为主,Dickinson判别图解表明物源主要来自于大陆物源区;姚家组砂岩的稀土元素以轻稀土富集、重稀土平坦、中度铕负异常为特征.砂岩CIA值为52.02~60.16,平均值为56.69,反映了干燥气候背景下弱的化学风化作用.源岩属性判别图解表明源岩为再旋回的古老沉积物及长英质火山岩.主量、微量和稀土元素的构造背景判别图解综合表明姚家组砂岩物源区为被动大陆边缘构造环境,结合区域构造演化,认为姚家组砂岩的物源为华北克拉通北缘燕山陆内造山带发育的火山-沉积岩系.      

新疆蒙其古尔地区八道湾组沉积岩碎屑锆石年代学特征及地质意义

在详细观察描述含砾砂岩宏观特征基础上,利用偏光显微镜和LA-ICP-MS对蒙其古尔地区八道湾组出露的含砾砂岩开展碎屑骨架组分及碎屑锆石U-Pb定年分析,初步解析岩石学、年代学及物源特征等信息。结果表明:碎屑锆石多具良好的振荡韵律环带,Th/U值大于0.1,为岩浆成因锆石;样品中最年轻的碎屑锆石年龄为(289±4)Ma,可限定八道湾组砂岩沉积下限为早二叠世;初步将碎屑锆石年龄分为3组,分别为1588～807 Ma、603～410 Ma、350～289 Ma,该年龄区间与已知构造-岩浆事件时间(晋宁期、加里东期和印支-海西期)基本对应,表明研究区构造岩浆活动与中国大地构造运动基本一致。据QFL与QmFLt图解,结合构造背景及盆地演化过程,认为八道湾组砂岩物源经历了由相对稳定的石英再旋回造山带区向过渡再旋回造山带,再向岩屑再旋回造山带区演变的过程。碎屑物源可能主要来源于南部乌孙山、那拉提山出露的石炭—奥陶纪火山岩及中酸性侵入岩。     

徐州地区山西组砂岩岩石学特征及物源分析

徐州地区山西组砂岩中碎屑组分鉴定统计的结果显示,长石的含量为29%~52%,平均40%,明显高于周边地区。研究区岩石类型以长石砂岩为主,分选差-中等,磨圆次棱角状-次圆状,说明碎屑为短距离搬运;砂岩中斜长石的牌号显示源区主要为酸性岩;砂岩组分的Dickinson三角图解表明,物源总体来自大陆物源区的隆起基底,经分析确定物源区为丰-沛隆起。     

鄂西南齐岳山须家河组物源及构造背景:来自岩石学、地球化学和锆石年代学的制约

为揭示鄂西南齐岳山地区晚三叠世须家河组物源与构造背景,以周家湾与颜家沟剖面为代表,对须家河组碎屑岩的颗粒组分、元素组成以及锆石年龄进行测试与统计.结果显示:砂岩碎屑颗粒石英含量高、岩屑与长石含量低,平均值分别为76.15%、8.90%与3.45%,具有锆石-板钛矿-磁铁矿-榍石-电气石重矿物组合,反映源岩以酸性岩或低级变质岩为主,Dickinson判别图解表明物源主要来自再旋回造山带;砂岩(TFe₂O₃+MgO)*与TiO₂*含量低,Al₂O₃/SiO₂比值低,K₂O/Na₂O比值高,最接近被动大陆边缘特征值;泥岩成分变异指数ICV分布于0.32~0.79之间,平均值为0.56,反映物源主要为再旋回沉积物;样品稀土元素配分模式、特征微量元素含量及比值指示晚三叠世沉积构造背景为被动与活动大陆边缘;碎屑锆石分为磨圆与自形两类,磨圆者具有2 480 Ma、1 880 Ma、832 Ma年龄峰值(n=133),年龄频数分特征与扬子陆块最接近;自形锆石具有435 Ma、217 Ma年龄峰值(n=42),年龄频数分布特征与秦岭造山带和雪峰造山带花岗岩年龄具有很好的对应关系.结合物源与构造背景判别图解,上述特征综合表明须家河组形成于被动大陆边缘(为主)与活动大陆边缘环境,其物源来自东南的雪峰造山带(为主)与北侧的秦岭造山带.      

石柱复向斜及周缘下志留统砂岩碎屑组分特征及其构造意义

通过系统研究石柱复向斜露头和钻井剖面的砂岩薄片,统计分析了下志留统龙马溪组、小河坝组、韩家店组砂岩碎屑组分特征,在此基础上,进行了砂岩多碎屑的Dickinson图解分析,对物源区类型和板块构造背景进行了分析。研究结果表明,研究区下志留统主要物源区的板块构造位置为被动大陆边缘,总体上看,研究区下志留砂岩的成熟度和稳定度很高,反应本区距物源区具有相当远的距离,陆源碎屑经过较为充分的搬运;龙马溪组砂岩主要来自稳定克拉通和再旋回造山带,小河坝组砂岩主要来自稳定克拉通,韩家店组砂岩主要来自再旋回造山带,反映华南板块和扬子板块的拼接除奥陶纪末期的初次碰撞外,早志留世均呈现出幕式、蠕动式的非刚性拼接特点。     

Detrital zircon geochronology analysis of the Late Mesozoic deposition in the Turpan‐Hami basin: Implications for the uplift history of the Eastern Tian Shan,north‐western China

Analysing the provenance changes of synorogenic sediments in the Turpan‐Hami basin by detrital zircon geochronology is an efficient tool to examine the uplift and erosion history of the easternmost Tian Shan. We present detrital zircon U‐Pb analysis from nine samples that were collected within marginal lacustrine Middle‐Late Jurassic and aeolian‐fluvial Early Cretaceous strata in the basin. Middle‐Early Jurassic (159–172 Ma) zircons deriving from the southern Junggar dominated the Middle Jurassic sample from the western Turpan‐Hami basin, whereas Permian‐Carboniferous (270–330 Ma) zircons from the Bogda mountains were dominant in the Late Jurassic to Early Cretaceous samples. Devonian‐Silurian (400–420 Ma) and Triassic (235–259 Ma) zircons from the Jueluotage and Harlik mountains constituted the subordinate age groups in the Late Jurassic and Early Cretaceous samples from the eastern basin respectively. These provenance transitions provide evidence for uplift of the Bogda mountains in the Late Jurassic and the Harlik mountains since the Early Cretaceous.     

渭河地区及周缘晚古生代-中生代碎屑锆石年代学、地球化学及构造-沉积意义

本文在对渭河地区及周缘晚古生代-中生代残存地层分布研究的基础上,采用岩石学、锆石同位素年代学、主微量元素地球化学分析方法,对渭河地区南北两侧上古生界二叠系及中生界三叠系进行对比,进而恢复了研究区晚古生代晚期、中生代早期沉积面貌,并结合裂变径迹构造抬升的研究结果,探讨了渭河地区中生代后期改造过程及演化阶段。结果显示:渭河盆地内部主要凹陷可能仅残留小范围的、不连续的C-P地层,未发现中生代地层。岩石学、锆石U-Pb年龄、主微量元素表明鄂尔多斯南部和北秦岭地区二叠系、三叠系具有很好的对比性,两者在相同时期为同一盆地。二叠系碎屑岩源区可能为再旋回造山带及陆块源区,主要来自北秦岭中-新元古界宽坪群变质碎屑岩及南部二郎坪群火山-沉积岩;三叠系沉积岩物源主要来自北秦岭地区的宽坪群、秦岭群或同期发育的火山岩。裂变径迹资料暗示渭河地区与渭北隆起及秦岭造山带中生代抬升期次具有一致性:晚侏罗世-早白垩世末,地层以强烈的构造变形、弱抬升为主;早白垩世末以来,地层发生大规模抬升、剥蚀,致使上古生界-中生界在渭河地区残留较少。在以上研究的基础上,将渭河地区晚古生代-中生代演化过程分为晚古生代二叠纪、中生代三叠纪-早中侏罗世、晚侏罗世-早白垩世末、早白垩世末-白垩纪末几个演化阶段。     

U–Pb dating of single detrital zircon grains from Mesozoic sandstone in the Beipiao Basin in the eastern Yan-Liao Orogenic Belt, China: provenance and correlation of tectonic evolution

Single grain U–Pb ages of sediments from the Beipiao Basin, Northeast China were conducted to determine the evolution of basin provenance. Zircons from a sandstone in the Upper Triassic Laohugou Formation yield a wide range of ages and, according to their U–Pb ages, fall into four groups: 209.3±4.0–304.2±4.9, 1565.5±71–2154±50, 2400±35–2499±9, 2512±11–2557±74 Ma. These ages indicate that the zircons were principally derived from Late Archean, Proterozoic and Late Paleozoic plutonic rocks. Intrusions in the Mongolian Accretion Belt and the northern margin of the North China Block (NCB) were probably the main source of the sediments in the basin, but the easterly Liaodong Block also provided minor detrital material, with lower U–Pb ages, during the Late Triassic. Most of the U–Pb ages from zircons collected from a sandstone in the Lower Jurassic Beipiao Formation range from 194.3±2.9 to 233.8±4.2 Ma, reflecting the major sediment source during the Early Jurassic. Zircons derived from Late Indosinian plutonic rocks increased, which suggests that the detritus was supplied mainly from the interior of the Yan-Liao Orogenic Belt, especially from the Liaodong Block. Late Indosinian zircons (200–230 Ma) were eroded and deposited in the Lower Jurassic Beipiao Formation, and this implies that intensive tectonic activation and uplift of the Yan-Liao Orogenic Belt in the Mesozoic commenced in the Late Indosinian.     

华北盆地三叠纪物源特征及其沉积—构造演化

华北盆地三叠纪沉积厚度大,分布广泛,其地层沉积特征很好地记录了周缘造山带或隆起区在该时期的构造演化过程。目前,前人已经对华北各地区三叠纪碎屑物源进行了大量研究,而对于物源区的认识仍存在分歧,对于盆缘地区沉积—构造演化过程的研究也相对较少。通过整理前人对华北各地区三叠纪碎屑物源研究的锆石年龄数据,并结合造山带构造演化过程和地层沉积特征,对华北盆地三叠纪碎屑物源及沉积—构造演化过程进行了整体研究。结果表明:华北北部三叠纪沉积物源均来自北缘的内蒙古隆起,锆石年龄和地层沉积特征记录了源区逐渐增强的岩浆活动和隆升过程。华北南部地区在该时期主要接受来自华北南缘二叠纪沉积盖层和北秦岭造山带的碎屑物质供给,华北南缘伴随着秦岭造山过程可能在中三叠世就已经逆冲隆升并遭受剥蚀,两者的协同演变共同控制着盆地南部沉积演化过程。鄂尔多斯盆地西北部碎屑物源主要来自阿拉善地块和北祁连造山带,西南部地区物源则主要来自盆地西南缘再旋回沉积盖层和北祁连造山带,分别为伸展和挤压状态下的内陆盆地沉积。早—中三叠世,华北盆地为统一的大型内陆沉积盆地,晚三叠世,盆地南、北缘发育沿褶皱逆冲带分布的陆内前陆盆地系统。     

Provenance analyses of early Mesozoic sediments in the Ningwu basin: Implications for the tectonic–palaeogeographic evolution of the northcentral North China Craton

This paper reports results from detrital zircon U–Pb geochronology, Hf isotopic geochemistry, sandstone modal analysis, and palaeocurrent analysis of the early Mesozoic strata within the Ningwu basin, China, with the aims of constraining the depositional ages and sedimentary provenances and shedding new light on the Mesozoic tectonic evolution of the northcentral North China Craton (NCC). The zircons from early Mesozoic sandstones are characterized by three major populations: Phanerozoic (late Palaeozoic and early Mesozoic), late Palaeoproterozoic (with a peak at approximately 1.8 Ga), and Neoarchaean (with a peak at approximately 2.5 Ga). Notably, three Phanerozoic zircons in the Early Triassic Liujiagou Formation were found to have positive ε_Hf(t) values and characteristics typical of zircons from the Central Asian Orogenic Belt (CAOB). Therefore, the CAOB began to represent the provenance of sediment in the sedimentary basins in the northern NCC no later than the Early Triassic (261 Ma), implying that the final amalgamation of the NCC and CAOB occurred before the Early Triassic. The U–Pb geochronologic and Hf isotopic results show that the Lower Middle Triassic sediments were mainly sourced from the Yinshan–Yanshan Orogenic Belt (YYOB), and that a sudden change in provenances occurred, shifting from a mixed YYOB and CAOB source in the Middle Jurassic to a primarily YYOB source in the Late Jurassic. The results of the sandstone modal analysis suggest that the majority of the samples from the Lower Middle Jurassic rocks were derived from either Continental Block or Recycled Orogen sources, whereas all the samples from the Upper Jurassic rocks were derived from Mixed sources. The change in source might be ascribed to the southward subduction and closure of the Okhotsk Ocean and the resulting intense uplift of the YYOB during the Late Jurassic. This uplift likely represents the start of the Yanshan Orogeny.     

碎屑矿物年代对佳木斯隆起隆升时间的制约

对佳木斯隆起周缘的勃利盆地和鸡西盆地中的早白垩世穆棱组和滴道组砂岩样品进行了系统的碎屑锆石U-Pb同位素年代学和碎屑白云母40Ar/39Ar同位素年代学研究。结果表明,滴道组和穆棱组沉积时期,没有500Ma或大于500Ma的来自佳木斯地块基底的年龄纪录,暗示佳木斯隆起在早白垩世穆棱组沉积时期尚未隆起。黑龙江东部盆地群为统一的原型盆地,结合对该区白垩纪砂岩的矿物组成和砾石统计的研究成果,认为早白垩世末东山组沉积以后佳木斯隆起开始隆升,猴石沟组沉积时期佳木斯隆起已经隆升到一定高度并为其周缘盆地提供物源,同时随着佳木斯隆起的隆升,原来早白垩世的统一盆地遭到分割破坏,形成诸多相对独立的盆地。     

鲁西隆起侏罗系碎屑主物源来自华北北缘:锆石U-Pb和Hf同位素年代学证据

鲁西隆起保存并出露比较完整的晚中生代沉积记录,是研究华北东部晚中生代构造演化的重要窗口。本文采用碎屑锆石LA-MC-ICP-MS测年方法分析鲁西隆起北缘淄川地区坊子组和三台组中的两个砂岩样品,以此探讨华北东部侏罗纪的沉积物源并约束构造古地理格架。两个砂岩样品具有近似的U-Pb年龄谱。古元古代和新太古代两组U-Pb年龄及其Hf同位素组成与广泛出露于北部的华北克拉通基底一致,根据缺乏新元古代中期(850～700 Ma)岩浆年龄和三叠纪变质年龄的事实,以此可以排除扬子板块以及现今临近于鲁西隆起东南部的苏鲁造山带物源。坊子组和三台组碎屑锆石显生宙年龄(393～256 Ma)记录的晚古生代岩浆活动均未发现于鲁西隆起及其邻近地区,而可以与大量出露于华北北缘及其北部的兴-蒙造山带的岩浆活动进行对比。此外,相当部分的显生宙碎屑锆石(183 Ma、462 Ma和324～154 Ma)具有正的ε_Hf(t)值(0.9～12.7)同位素特征,也与兴-蒙造山带特征相似,且三台组砂岩中显生宙碎屑锆石及其中ε_Hf(t)值为正值的比例较坊子组均增多。研究认为,华北北缘及其北部的兴-蒙造山带在侏罗纪时从早到晚不断抬升、剥蚀,形成相对华北克拉通内部的高地势特点,由此大量的剥蚀产物向南输运而成为鲁西隆起侏罗系的主要碎屑物源。     

孙吴-嘉荫盆地晚白垩世地层物源及构造背景

为揭示孙吴-嘉荫盆地晚白垩世富饶组和太平林场组的物源特征及其构造背景,对两组样品进行了碎屑锆石LA-ICP-MS U-Pb定年和地球化学特征研究.富饶组碎屑锆石55个测点产生以下年龄峰值:65 Ma、280 Ma和496 Ma,太平林场组碎屑锆石78个测点产生以下年龄峰值:98 Ma,189 Ma,240 Ma和488 Ma,表明富饶组和太平林场组具有混合物源的特征.Al₂O₃/TiO₂平均值分别为41.42和29.31,结合主量、微量及稀土元素特征和碎屑锆石峰值年龄,确定富饶组和太平林场组物源主要为晚中生代长英质火成岩和沉积岩.地球化学和区域构造演化特征共同揭示富饶组和太平林场组物源区构造背景为活动大陆边缘,区域内晚中生代岩浆事件、佳木斯地块北部麻山群及广泛分布的古生代花岗岩为盆地晚白垩世地层提供了沉积物源.      

石臼坨凸起西南陡坡带扇三角洲锆石定年与源汇示踪

为了示踪渤海湾盆地石臼坨凸起西南陡坡带扇三角洲源汇体系,对其东三段层序（Ed₃）的6个砂岩样品进行碎屑锆石U-Pb定年分析.西部扇体（C6-4-4井）富含白垩纪（K）锆石并具有110 Ma峰值,母岩以白垩系义县组火成岩为主;中部（C6-4-3、C6-4-6D井）、东部扇体（C6-4-5D）富含侏罗纪（J）锆石并具有152 Ma或168 Ma峰值,母岩以侏罗系蓝旗组火成岩为主,古生代（Pz）锆石则来自中生界碎屑岩.所有样品都含有太古代（Ar）、元古代（Pt）锆石,母岩为花岗岩基底.研究表明,除古生界碳酸盐岩外,源区的母岩地层均可通过碎屑锆石U-Pb年龄示踪,各扇体物源的差异性是由母岩地层倾向控制的,由于中生界向西北倾斜,白垩系主控西部扇体沉积,侏罗系则是中部、东部扇体的主要物源区.      

Study and geological implication of detrital zircons in Shuibei Formation of Early Jurassic in Zhangshudun of northeastern Jiangxi Province

The Early Jurassic basin in Zhangshudun of northeastern Jiangxi Province is located in the southeastern part of Jiangnan orogeny, and revealing the basin depositional source is of great importance for understanding and discussing the orogenic events and ancient geography during Early Mesozoic. The research of petrography, detrital zircons U-Pb geochronology, Lu-Hf isotope geochemistry of Early Jurassic clastic rocks was conducted in this paper. The results show that the Early Jurassic Shuibei Formation includes molasse-like deposits and fluviatile-lacustrine facies, and the detrital zircons U-Pb ages are within the wide scope of 2 431~263 Ma, with no existence of synsedimentary or pensynsedimentary detrital zircons. The detrital zircons display a very obvious peak age in Early Paleozoic of 420~380 Ma, with ε_Hf(t) values between -10.7 and -3 and T_DM^C values between 2.08 and 1.58 Ga. The weak peak ages of 370~355 Ma and 858~663 Ma are displayed in Late Paleozoic and Neoproterozoic,respectively, with ε_Hf(t) values of -18.8 to -6.7 and T_DM^C values of 2.08 to 1.58 Ga. The detrital zircons also contain a few Early Mesozoic (263 Ma) and Paleo-Meso proterozoic (2 431~1 224 Ma) ages. The detrital zircons ages and Lu-Hf isotope are similar with geological entities in northwestern Wuyi area of Cathaysia Block, while they are obviously different from the ages of the geological body in southeastern Yangtze region. The detrital materials are mainly from Early Cambrian basement and Paleozoic geological body northwestern Wuyi area. While little detrital rocks may come from northwestern Zhejiang with sedimentary characters of passive continental margin. Combined with the comprehensive regional research results of Early Mesozoic basin, the authors conclude that the southeastern Jingdezhen-Huangshan of eastern Jiangnan orogenic belt was not uplifting with erosion in Early and Middle Jurassic, and the Mesozoic structural-magmatic activities in the inland of South China were the tectonic response to the dive and influx of multiplates. The uplift in the southezstern part of South China caused by the subduction of the paleo-pacific plate to the East Asian continent from the Late Triassic to Early Jurassic can provide provenance for the inland basin, and the tectonic constitution at the turn of the Early-Middle Jurassic has been transformed into the subduction of the paleo-pacific plate.