北祁连-河西走廊志留纪和泥盆纪古地理及其对同造山过程的沉积响应

北祁连-河西走廊志留系包括下志留统鹿角沟砾岩和肮脏沟组、中志留统泉脑沟山组和上志留统旱峡组，泥盆系包括中、下泥盆统老君山组和上泥盆统沙流水组。鹿角沟砾岩为水下冲积扇沉积，断续分布于北祁连西段。肮脏沟组在北祁连-河西走廊分布广泛，主要为半深海碎屑复理石沉积。泉脑沟山组和旱峡组分布于北祁连和河西走廊西段，前者以浅海相砂泥岩和泥灰岩为主，后者以滨海潮坪-浅海碎屑岩沉积为主。老君山组分布于古祁连山山前和山间盆地，为粗碎屑磨拉石沉积。沙流水组分布于河西走廊东段，为湖相沉积。区域古地理分析表明，北祁连-河西走廊志留纪-泥盆纪的古地理主要受北祁连加里东-早海西期不规则造山作用控制。鹿角沟砾岩标志着弧-陆碰撞最早发生于早志留世早期。早志留世北祁连-河西走廊由弧后残余盆地向前陆盆地转化。中、晚志留世北祁连东段剧烈造山并与阿拉善古陆的连接，前陆盆地限于北祁连-河西走廊西段。志留纪末期为北祁连的主造山期，泥盆纪形成高峻的古祁连山。早、中泥盆世形成山前和山间盆地的粗碎屑磨拉石沉积。晚泥盆世造山带西段造山作用剧烈，形成剥蚀区。东段造山作用微弱，山地被剥蚀，山前形成湖泊相的晚泥盆世沉积。     

从弧后盆地到前陆盆地--北祁连造山带奥陶纪-泥盆纪的沉积盆地与构造演化

北祁连加里东期造山带是在新元古代Rodinia联合大陆(Pangea-850)基础上裂解，经由寒武纪裂谷盆地、奥陶纪初期成熟洋盆、奥陶纪中晚期北祁连活动大陆边缘、志留纪-早、中泥盆世碰撞造山而形成的。奥陶纪中、晚期，北祁连、走廊地区中、上奥陶统发育洋壳-岛弧-弧后火山岩，形成典型的沟-弧-盆体系的沉积。志留纪-早、中泥盆世是北祁连-走廊沉积盆地的转换时期。除天祝、古浪、景泰及肃南等局部地区发育下志留统钙碱性系列火山岩以外，全区志留系均以碎屑岩沉积为主。志留系底部多见一套砾岩层。下-中志留统为典型复理石相的浊流沉积。上志留统变为滨浅海相磨拉石沉积。早、中泥盆世雪山群为典型的陆相粗碎屑磨拉石沉积。从空间分布上看，志留系-泥盆系在走廊-北祁连地区也有自北向南厚度加大、粒度变粗的特征，古流以由南向北、来自造山带的古流为特征。北祁连-河西走廊奥陶纪弧后盆地火山岩-志留系复理石-海相磨拉石-中、下泥盆统陆相磨拉石的充填序列以及空间分布特点，反映为典型的弧后盆地向前陆盆地转化的沉积序列。     

从弧后盆地到前陆盆地——北祁连造山带奥陶纪-泥盆纪的沉积盆地与构造演化

北祁连加里东期造山带是在新元古代Rodinia联合大陆(Pangea-850)基础上裂解,经由寒武纪裂谷盆地、奥陶纪初期成熟洋盆、奥陶纪中晚期北祁连活动大陆边缘、志留纪-早、中泥盆世碰撞造山而形成的.奥陶纪中、晚期,北祁连、走廊地区中、上奥陶统发育洋壳-岛弧-弧后火山岩,形成典型的沟-弧-盆体系的沉积.志留纪-早、中泥盆世是北祁连-走廊沉积盆地的转换时期.除天祝、古浪、景泰及肃南等局部地区发育下志留统钙碱性系列火山岩以外,全区志留系均以碎屑岩沉积为主.志留系底部多见一套砾岩层.下-中志留统为典型复理石相的浊流沉积.上志留统变为滨浅海相磨拉石沉积.早、中泥盆世雪山群为典型的陆相粗碎屑磨拉石沉积.从空间分布上看,志留系-泥盆系在走廊-北祁连地区也有自北向南厚度加大、粒度变粗的特征,古流以由南向北、来自造山带的古流为特征.北祁连-河西走廊奥陶纪弧后盆地火山岩-志留系复理石-海相磨拉石-中、下泥盆统陆相磨拉石的充填序列以及空间分布特点,反映为典型的弧后盆地向前陆盆地转化的沉积序列.     

从弧后盆地到前陆盆地——北祁连造山带奥陶纪—泥盆纪的沉积盆地与构造演化

北祁连加里东期造山带是在新元古代Rodinia联合大陆(Pangea-850)基础上裂解,经由寒武纪裂谷盆地、奥陶纪初期成熟洋盆、奥陶纪中晚期北祁连活动大陆边缘、志留纪—早、中泥盆世碰撞造山而形成的。奥陶纪中、晚期,北祁连、走廊地区中、上奥陶统发育洋壳-岛弧-弧后火山岩,形成典型的沟-弧-盆体系的沉积。志留纪—早、中泥盆世是北祁连-走廊沉积盆地的转换时期。除天祝、古浪、景泰及肃南等局部地区发育下志留统钙碱性系列火山岩以外,全区志留系均以碎屑岩沉积为主。志留系底部多见一套砾岩层。下—中志留统为典型复理石相的浊流沉积。上志留统变为滨浅海相磨拉石沉积。早、中泥盆世雪山群为典型的陆相粗碎屑磨拉石沉积。从空间分布上看,志留系—泥盆系在走廊—北祁连地区也有自北向南厚度加大、粒度变粗的特征,古流以由南向北、来自造山带的古流为特征。北祁连-河西走廊奥陶纪弧后盆地火山岩—志留系复理石-海相磨拉石—中、下泥盆统陆相磨拉石的充填序列以及空间分布特点,反映为典型的弧后盆地向前陆盆地转化的沉积序列。     

北祁连造山带东段上奥陶统一下、中泥盆统砂岩碎屑组分与物源分析

北祁连造山带东部武威斜豪-古浪石城子-靖远水泉-带上奥陶统一下、中泥盆统砂岩碎屑组分源区大地构造背景的判别结果表明,上奥陶统砂岩中的沉积物主要来自弧造山带内的过渡岛弧源区,并且早期可能含有较多的来自未分割岛弧源区的物质,下志留统砂岩中的沉积物主要来自碰撞造山带,而下、中泥盆统砂岩中的沉积物主要来自卷入碰撞造山带内的分割...     

鄂尔多斯盆地西南部上古生界碎屑锆石U-Pb年龄及其构造意义

通过对鄂尔多斯盆地西南部晚古生代山西组1段和下石盒子组8段碎屑锆石进行LA-ICP-MS U-Pb测年分析,结合周缘地层年龄结构和地质历史事件,进而追寻盆地沉积物物源,推断盆地与造山带的盆山耦合过程。研究表明105个岩浆成因的碎屑锆石可分为4个年龄组段:(1)260~340 Ma,占总数的21.9%,推断物源主要来自北秦岭和西秦岭构造带;(2)370~470 Ma,占总数的24.8%,反映物源主要来自北秦岭、西秦岭构造带和北祁连造山带;(3)1600~2000 Ma,占总数的32.4%,指示物源来自北秦岭造山带、北祁造山带和华北板块;(4)2300~2600 Ma,占总数的15.2%,物源分别来自华北板块基底结晶岩系、北祁连构造带、北秦岭构造带和西秦岭构造带。研究区总体上具有来自北秦岭造山带、西秦岭造山带、北祁连造山带、兴蒙造山带及华北板块基底五个物源区,其中兴蒙造山带、北秦岭造山带和北祁连造山带为主要物源区。古生代碎屑锆石年龄证实了鄂尔多斯盆地西南部奥陶纪被动大陆边缘形成,志留纪—泥盆纪转化为陆-陆碰撞造山带,石炭纪—二叠纪逐渐由造山带转化为沉积盆地。     

北祁连山及其邻区古生代以来的大地构造演化初探

北祁连山出露有中寒武世中晚期和早中奥陶世两期蛇绿岩。同位素年龄分别为335.5 Ma和440-460 Ma的两期高压变质带赋存于中寒武统和下中奥陶统中。大量地质记录揭示北祁连山是介于阿拉善地块和中祁连地块间的一个早古生代缝合带。北祁连山及其邻区古生代以来大地构造演化是复杂的。中寒武世早期统一的中国古陆经陆内裂谷作用发生裂解,于中寒武世中晚期形成北祁连洋。到晚寒武世洋盆转化成残留海盆。早奥陶世北祁连地区再次拉张,遭受第二次大洋化,到中奥陶世形成具沟弧盆体系的成熟大洋。晚奥陶世洋盆转化成残留海盆。于晚奥陶世末碰撞成山,志留纪在新生褶皱山系前形成前陆盆地,盆地底部的下志留统下部层位的磨拉斯可视为碰撞造山的标志。到泥盆纪进入碰撞期后造山阶段,泥盆纪磨拉斯则作为碰撞期后造山作用的标志。北祁连山及其邻区经历了石炭-三叠纪上叠盆地发展阶段,到侏罗纪进入陆内造山阶段。陆内造山作用的主要特征是山脉抬升、盆地沉降,形成盆-岭构造。这个作用一直持续到现在。笔者还对碰撞作用和造山作用的类型进行了讨论。认为软碰撞(soft collision)引起洋盆闭合,但不造山,硬碰撞(rigid collision)使残留海盆闭合并形成新生褶皱山系。在北祁连可以辨认出碰撞造山、碰撞期后造山及陆内造山这3种类型各具特征的造山作用。     

北祁连肃南地区阴沟群形成时代及沉积源区讨论——碎屑锆石U-Pb年龄证据

北祁连造山带肃南地区是阴沟群的典型分布区,主要由中基性火山岩、火山碎屑岩夹硅质岩、变质泥岩及砂岩组成。本文对阴沟群上部2件粗砂岩碎屑锆石进行LA-ICP-MS U-Pb年龄的测定,分别获得最小谐和年龄(425±2)Ma、(425±5)Ma,代表其形成时代可能为早—中志留世,说明肃南地区原划为早奥陶世的阴沟群可能存在不同时代的物质组成,其形成时代需要进一步的厘定。碎屑锆石谐和年龄分布特征表明,其物源主要来自南部的中祁连地块(800~1000 Ma、1600~1800 Ma),其次来自北祁连岛弧和同碰撞/碰撞后花岗岩(425~510 Ma),而源自北部华北板块的沉积物(老于1800 Ma的锆石)则极少。     

青藏高原东北缘祁连山三叠系砂岩碎屑锆石U-Pb定年及其物源分析

三叠系沉积物广泛覆盖青藏高原东北缘,其中松潘—甘孜地区三叠系的沉积物得到了较系统的研究,但是青藏高原北缘的祁连山三叠系盆地的研究却较为缺乏。为了丰富相关研究和揭示区域构造演化的特点,通过古水流方向统计、砂岩中碎屑矿物统计和碎屑锆石U-Pb测年等方法对祁连山三叠纪盆地物源进行系统研究。结果表明,祁连山三叠系盆地的古流向主要有南东向、正南向、南西向,物源来自岩浆弧和大规模褶皱造山作用的混合区。祁连山三叠系砂岩中的碎屑锆石的年龄谱主要峰值集中在250~290 Ma、360~460 Ma、1 600~2 000 Ma和2 200~2 600 Ma这4个年龄段。通过对比分析华北板块、华南板块中和秦祁昆中央造山带中岩浆锆石年龄谱特征可知:1 600~2 000 Ma和2 200~2 600 Ma年龄段的锆石来自华北板块,360~460 Ma年龄段的锆石来自北祁连造山带,250~290 Ma年龄段的锆石来自东昆仑的火山岛弧。此外,600~1 000 Ma年龄段锆石很少,这些锆石来自扬子板块,表明在三叠纪扬子克拉通和华北克拉通发生碰撞形成了秦岭造山带,阻断了来自扬子克拉通的物源。     

内蒙东乌珠穆沁旗地区多金属矿床类型与成矿规律

<正>1地质背景内蒙古东乌珠穆沁旗地区位于西伯利亚板块东南缘查干敖包—奥尤特—朝不楞早古生代构造-岩浆岩带东段,其东南侧就是西伯利亚板块与华北板块的缝合带——二连浩特—贺跟山深大断裂带(聂凤军等,2007;张万益等,2009)。区域范围内出露的地层有中奥陶统、上志留统、泥盆系、下二叠统、侏罗系和白垩系火山-沉积岩以及第三系和第四系沉积物。区内岩浆岩分布广     

Silurian collisional suturing onto the southern margin of the North China craton: Detrital zircon geochronology constraints from the Qilian Orogen

The Qilian Orogen of north western China records mid-Paleozoic collisional suturing of arc and continental blocks onto the south western margin of the North China craton. Silurian strata from the retroarc foreland basin mark the transition from ocean closure and northward subduction to the initiation of collision suturing. Detrital zircons were analysed from the western and eastern parts of the basin and show a spectrum of ages from Archean to Paleozoic with major age concentrations at around 2.5 Ga, 1.6 Ga, 1.2 Ga, 0.98 Ga, 0.7 Ga and 0.45 Ga. Archean age grains are derived from the North China craton, whereas the Central Qilian Bloc, which lies to the south provides the likely source for the bulk of the Proterozoic detritus. Paleozoic grains are restricted to Early Silurian samples from the western part of the basin and are considered to have been derived from the magmatic arc related to ocean closure and ultimate collision of the Central Qilian Belt with the North China craton.     

Silurian Sedimentation in the South Qilian Belt: Arc-Continent Collision-related Deposition in the NE Tibet Plateau?

The South Qilian belt mainly comprises an early Paleozoic arc-ophiolite complex, accretionary prism, microcontinental block, and foreland basin. These elements represent accretion-collision during Cambrian to Silurian time in response to closure of the Proto-Tethyan Ocean in the NE of the present-day Tibet Plateau. Closure of the Proto-Tethyan Ocean between the Central Qilian block and the Oulongbuluke block and the associated collision took place from NE to SW in a zipper-like style. Sediment would have been dispersed longitudinally SW-ward with a progressive facies migration from marginal alluvial sediments toward slope deep-water and deep-sea turbidites. This migration path indicates an ocean basin that shrank toward the SW. The Balonggongga'er Formation in the western South Qilian belt represents the fill of a latest Ordovician-Silurian remnant ocean basin that separated the Oulongbuluke block from the Central Qilian block, and records Silurian closure of the Proto-Tethyan Ocean and subduction beneath the Central Qilian block. However, alluvial deposits in the Lajishan area were accumulated in a retro-foreland basin, indicating that continent-continent collision in the eastern South Qilian belt occurred at c. 450–440 Ma. These results demonstrate that the Proto-Tethyan Ocean closed diachronously during early Paleozoic time.     

Geochemistry of Sandstones from the Silurian Hanxia Formation,North Qilian Belt,China: Implication for Provenance,Weathering and Tectonic Setting

The North Qilian orogenic belt is the key to figure out the evolution and assembly of Asia. The Upper Silurian Hanxia Formation which is deposited in the north area of North Qilian Orogenic Belt is of utmost important to reveal the architecture and orogenic process of the North Qilian belt. So provenance analysis of the Hanxia Formation is of significance to reveal not only that the tectonic evolution of the central orogenic belt China, but also that Paleozoic Asia plate reconstruction. The ratios of elements and some discrimination diagrams based on geochemistry indicate that felsic rocks constitute their main source rocks. The chemical index of alteration is less than 80, indicating that the source rocks are relatively fresh and of low maturity. On the Th/Sc versus Zr/Sc scatter plot, samples from Hanxia Formation occur along the magmatic compositional variation trend of rocks, indicating that the rocks did not undergo obvious sedimentary sorting and recycling. The major and trace elements discrimination diagrams imply that Hanxia Formation rocks were derived from continental island arc. Recent studies show that the North China plate subducted southwards and produced subduction-related arc magmatism along the southern margin of the North Qilian Terrane during the Silurian. Therefore, we infer that in the late Silurian period the subduction-related arc became accreted to the Central Qilian terrane to the south, forming a composite continental arc, and the North Qilian belt accumulated in a fore-arc basin.     

北祁连西段肃南地区下志留统肮脏沟组河流相的发现及其大地构造意义

北祁连地区位于中国中央造山带中段,具有典型造山带的特征。区内志留系肮脏沟组沉积环境存在较大争议,以致对其沉积期古地理格局的认识就存在很大差异。本研究选取志留系肮脏沟组发育齐全的肃南地区老虎沟剖面为研究对象,通过野外剖面实测、室内薄片鉴定和碎屑岩粒度分析等方法对老虎沟剖面肮脏沟组沉积充填序列、沉积构造和沉积相类型进行了细致分析。北祁连肃南地区老虎沟剖面志留系肮脏沟组发育大套的砾岩、砂砾岩和含砾砂岩,沉积构造以大型槽状交错层理、板状交错层理、平行层理和底冲刷构造为主,其中砂岩碎屑的成分和结构成熟度都较低;砂岩段的滚动组分含量较高,纵向剖面上显示为向上远离物源区,粒度变细的演化序列。沉积特征指示北祁连肃南地区老虎沟剖面志留系肮脏沟组的沉积相为辫状河流相,并非前人认为的造山俯冲阶段或者弧陆碰撞阶段的深水海相沉积,而是已经发生陆—陆碰撞形成的陆相沉积。此时北祁连东部地区还未发生陆—陆碰撞,由此可知北祁连在早志留世碰撞为“西早东晚”的不规则点式碰撞。本研究有助于深化对北祁连造山带志留纪的古地理格局和其大地构造背景的认识。     

北祁连西段肃南地区下志留统肮脏沟组河流相的发现及其大地构造意义

北祁连地区位于中国中央造山带中段,具有典型造山带的特征。区内志留系肮脏沟组沉积环境存在较大争议,以致对其沉积期古地理格局的认识就存在很大差异。本研究选取志留系肮脏沟组发育齐全的肃南地区老虎沟剖面为研究对象,通过野外剖面实测、室内薄片鉴定和碎屑岩粒度分析等方法对老虎沟剖面肮脏沟组沉积充填序列、沉积构造和沉积相类型进行了细致分析。北祁连肃南地区老虎沟剖面志留系肮脏沟组发育大套的砾岩、砂砾岩和含砾砂岩,沉积构造以大型槽状交错层理、板状交错层理、平行层理和底冲刷构造为主,其中砂岩碎屑的成分和结构成熟度都较低;砂岩段的滚动组分含量较高,纵向剖面上显示为向上远离物源区,粒度变细的演化序列。沉积特征指示北祁连肃南地区老虎沟剖面志留系肮脏沟组的沉积相为辫状河流相,并非前人认为的造山俯冲阶段或者弧陆碰撞阶段的深水海相沉积,而是已经发生陆—陆碰撞形成的陆相沉积。此时北祁连东部地区还未发生陆—陆碰撞,由此可知北祁连在早志留世碰撞为"西早东晚"的不规则点式碰撞。本研究有助于深化对北祁连造山带志留纪的古地理格局和其大地构造背景的认识。     

关于古亚洲洋构造演化研究的几点思考

古亚洲洋不是西伯利亚陆台和华北地台间的一个简单洋盆,而是在不同时间、不同地区打开和封闭的多个大小不一的洋盆复杂活动(包括远距离运移)的综合体.其北部洋盆起始于新元古代末-寒武纪初(573~522Ma)冈瓦纳古陆裂解形成的寒武纪洋盆.寒武纪末-奥陶纪初(510~480Ma),冈瓦纳古陆裂解的碎块、寒武纪洋壳碎块和陆缘过渡壳碎块相互碰撞、联合形成原中亚-蒙古古陆.奥陶纪时,原中亚-蒙古古陆南边形成活动陆缘,志留纪形成稳定大陆.泥盆纪初原中亚-蒙古古陆裂解,裂解的碎块在新形成的泥盆纪洋内沿左旋断裂向北运动,于晚泥盆世末到达西伯利亚陆台南缘,重新联合形成现在的中亚-蒙古古陆.晚古生代时,在现在的中亚-蒙古古陆内发生晚石炭世(318~316Ma)和早二叠世(295~285Ma)裂谷岩浆活动,形成双峰式火山岩和碱性花岗岩类.蒙古-鄂霍次克带是西伯利亚古陆和中亚-蒙古古陆之间的泥盆纪洋盆,向东与古太平洋连通,洋盆发展到中晚侏罗世,与古太平洋同时结束,其洋壳移动到西伯利亚陆台边缘受阻而向陆台下俯冲,在陆台南缘形成广泛的陆缘岩浆岩带,从中泥盆世到晚侏罗世都非常活跃.古亚洲洋的南部洋盆始于晚寒武世.此时,华北古陆从冈瓦纳古陆裂解出来,在其北缘形成晚寒武世-早奥陶世的被动陆缘和中奥陶世-早志留世的沟弧盆系.志留纪腕足类生物群的分布表明,华北地台北缘洋盆与塔里木地台北缘、以及川西、云南、东澳大利亚有联系,而与上述的古亚洲洋北部洋盆没有关连,两洋盆之间有松嫩-图兰地块间隔.晚志留世-早泥盆世,华北地台北部发生弧-陆碰撞运动,泥盆纪时,在松嫩地块南缘形成陆缘火山岩带,晚二叠世-早三叠世华北地台与松嫩地块碰撞,至此古亚洲洋盆封闭.古亚洲洋的南、北洋盆最后的褶皱构造,以及与塔里木地台之间发生的直接关系,很可能是后期的构造运动所造成的.     

试论新疆东准噶尔早古生代岩石圈板块构造演化

本文根据近年对新疆东准噶尔地层古生物、蛇绿岩和岛弧型岩浆岩等的野外调查和室内综合研究,系统阐述了该区早古生代期间岩石圈板块构造演化的前奥陶纪板内、奥陶纪至中志留世洋盆和晚志留世陆表海3个构造阶段,并把该区奥陶纪至中志留世的大地构造单元分为阿尔泰被动陆缘区、扎河坝北塔山缝合带(前身为东准噶尔洋盆)和准噶尔地块北部活动陆缘区(包括索尔巴斯他乌-纸房岛弧和库布苏弧后盆地),对各构造单元的特征及演化做了比较详细的论述。同时,对东准噶尔早古生代的大地构造背景及与邻区的关系亦进行了探讨。     

冈底斯-喜马拉雅碰撞造山带前陆盆地系统及构造演化

碰撞带前陆盆地的建立是大陆碰撞的直接标志和随后造山带构造变形的忠实记录。本文对欧亚板块与印度板块碰撞前后发育在拉萨地块上的冈底斯弧背前陆盆地,同碰撞产生的雅鲁藏布江周缘前陆盆地,以及碰撞后陆内变形产生的喜马拉雅前陆盆地的沉积地层演化以及碎屑锆石物源特征等进行了系统分析,结合前人及我们近些年的研究成果,认为冈底斯岛弧北侧发育一个典型的弧背前陆盆地系统而不是以前普遍接受的伸展盆地。除传统认为的喜马拉雅前陆盆地系统外,在碰撞造山带中还发育一个雅鲁藏布江前陆盆地系统,它是欧亚板块与印度板块碰撞以后,欧亚板块加载到印度被动大陆边缘产生的典型周缘前陆盆地。上述2个造山带前陆盆地系统的识别,大大提高了对新特提斯洋俯冲、碰撞过程的认识。造山带前陆盆地证据指示,新特提斯洋至少于140 Ma以前就已开始俯冲, 110 Ma俯冲速度开始提高,在65 Ma前后印度大陆与欧亚大陆发生碰撞,喜马拉雅山于40 Ma开始隆升,其剥蚀物质大量堆积在喜马拉雅前陆盆地中。     

Detrital zircon U–Pb ages of Late Triassic–Late Jurassic deposits in the western and northern Sichuan Basin margin: constraints on the foreland basin provenance and tectonic implications

Upper Triassic to Upper Jurassic strata in the western and northern Sichuan Basin were deposited in a synorogenic foreland basin. Ion–microprobe U–Pb analysis of 364 detrital zircon grains from five Late Triassic to Late Jurassic sandstone samples in the northern Sichuan Basin and several published Middle Triassic to Middle Jurassic samples in the eastern Songpan–Ganzi Complex and western and inner Sichuan Basin provide an initial framework for understanding the Late Triassic to Late Jurassic provenance of western and northern Sichuan Basin. For further understanding, the paleogeographic setting of these areas and neighboring hinterlands was constructed. Combined with analysis of depocenter migration, thermochronology and detrital zircon provenance, the western and northern Sichuan Basin is displayed as a transferred foreland basin from Late Triassic to Late Jurassic. The Upper Triassic Xujiahe depocenter was located at the front of the Longmen Shan belt, and sediments in the western Sichuan Basin shared the same provenances with the Middle–Upper Triassic in the Songpan–Ganzi Complex, whereas the South Qinling fed the northern Sichuan Basin. The synorogenic depocenter transferred to the front of Micang Shan during the early Middle Jurassic and at the front of the Daba Shan during the middle–late Middle Jurassic. Zircons of the Middle Jurassic were sourced from the North Qinling, South Qinling and northern Yangtze Craton. The depocenter returned to the front of the Micang Shan again during the Late Jurassic, and the South Qinling and northern Yangtze Craton was the main provenance. The detrital zircon U–Pb ages imply that the South and North China collision was probably not finished at the Late Jurassic.