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佳木斯地块位于中国东北微陆块群的最东缘,其东缘地区晚古生代的岩浆和沉积演变进程为欧亚大陆东缘由被动陆缘向活动陆缘构造环境的转化提供了关键证据。年代学和地球化学研究表明,佳木斯地块东缘中泥盆世黑台组砂岩,形成于被动陆缘的构造环境,黑台组上覆的老秃顶子组流纹岩也形成于被动陆缘的构造环境;晚石炭世珍子山组砂岩,形成于活动陆缘的构造环境;早二叠世的二龙山组安山岩以及相邻地区早二叠世的其它火成岩形成于活动陆缘的构造环境。同时,佳木斯地块东缘泥盆-二叠纪的沉积地层也呈现出由浅海相到陆相地层转化的特征。因此,佳木斯地块东缘由被动陆缘向活动陆缘的转化应该发生在中泥盆世到晚石炭世,而该构造环境的转化也为晚古生代时期蒙古-鄂霍茨克洋向欧亚大陆之下俯冲过程的研究提供了关键信息。 相似文献
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佳木斯地块位于中亚造山带东段,是我国东北地区一个重要的大地构造单元,古生代以来经历了复杂的多构造体系叠合的演化过程。本文在总结近二十年已报导的相关研究成果基础上,结合笔者近年工作,探讨了佳木斯地块的基底属性和来源,重塑了佳木斯地块西缘碰撞拼贴,以及东缘俯冲-增生的构造演化过程。研究表明,佳木斯地块具有亲冈瓦纳大陆的构造属性,裂离后经历了长距离的北漂。与松辽地块先后两次拼合,首次发生于中志留世(～425Ma),在晚二叠世前后(～250Ma)沿原缝合带位置发生裂解,拉张出新的有限洋盆(牡丹江洋),并于侏罗纪(185～145Ma)与松辽地块沿牡丹江-依兰构造带再次碰撞拼贴,形成了高压变质的黑龙江增生杂岩带。而佳木斯地块东缘受晚石炭世-晚三叠世(305～250Ma)泛大洋的俯冲-增生事件影响,形成了跃进山增生杂岩,随后于中侏罗世-早白垩世(165～128Ma)在古太平洋板块的西向俯冲作用下,形成了饶河增生杂岩。因此,佳木斯地块的构造演化既涉及了晚古生代古亚洲洋构造域的消亡,又经历了中生代古太平洋构造域的叠加与改造,而黑龙江杂岩的形成标志着古太平洋构造体制与古亚洲洋构造体制的转换始于晚三叠世(～210Ma)。 相似文献
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黑龙江杂岩带作为佳木斯地块与松嫩地块间缝合带的组成部分,对于探究佳木斯地块晚古生代—中生代构造演化具有重要意义。本文选取牡丹江地区黑龙江杂岩带中云母片岩进行碎屑锆石LA-ICP-MS U-Pb年代学分析,从而限定黑龙江杂岩的形成时代。结果显示,云母片岩中最年轻的碎屑锆石年龄分布为176～172 Ma,平均年龄为174±1 Ma,该组锆石发育明显的岩浆振荡环带结构,并且Th/U比值大于0.3,具有岩浆锆石的典型特征,限定了云母片岩原岩的沉积时间下限,表明黑龙江杂岩的形成时代可能在早侏罗世晚期至中侏罗世之后。本文对黑龙江杂岩中云母片岩的碎屑锆石年龄谱进行物源分析,结合前人的研究成果,发现其碎屑锆石年龄分布介于1 339～172 Ma之间,主要集中在1 339～741 Ma、553～497 Ma和267～172 Ma的3个区间,分别与佳木斯地块和松嫩—张广才岭地块上的多期岩浆事件相对应,说明其源区主要是佳木斯地块和松嫩—张广才岭地块。通过对黑龙江杂岩和小兴安岭—张广才岭岩浆岩带所报道的研究结果进行归纳总结,对佳木斯地块晚古生代—中生代的构造演化提出了新的认识：在早二叠世,佳木斯地块为牡丹江洋中的陆块;晚三叠世—早-中侏罗世期间,牡丹江洋向松嫩地块进行俯冲,形成黑龙江杂岩。 相似文献
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《China Geology》2022,5(4):555-578
The eastern Central Asian Orogenic Belt (CAOB) in NE China is a key area for investigating continental growth. However, the complexity of its Paleozoic geological history has meant that the tectonic development of this belt is not fully understood. NE China is composed of the Erguna and Jiamusi blocks in the northern and eastern parts and the Xing’an and Songliao-Xilinhot accretionary terranes in the central and southern parts. The Erguna and Jiamusi blocks have Precambrian basements with Siberia and Gondwana affinities, respectively. In contrast, the Xing ’an and Songliao-Xilinhot accretionary terranes were formed via subduction and collision processes. These blocks and terranes were separated by the Xinlin-Xiguitu, Heilongjiang, Nenjiang, and Solonker oceans from north to south, and these oceans closed during the Cambrian (ca. 500 Ma), Late Silurian (ca. 420 Ma), early Late Carboniferous (ca. 320 Ma), and Late Permian to Middle Triassic (260 –240 Ma), respectively, forming the Xinlin-Xiguitu, Mudanjiang-Yilan, Hegenshan-Heihe, Solonker-Linxi, and Changchun-Yanji suture zones. Two oceanic tectonic cycles took place in the eastern Paleo-Asian Ocean (PAO), namely, the Early Paleozoic cycle involving the Xinlin-Xiguitu and Heilongjiang oceans and the late Paleozoic cycle involving the Nenjiang-Solonker oceans. The Paleozoic tectonic pattern of the eastern CAOB generally shows structural features that trend east-west. The timing of accretion and collision events of the eastern CAOB during the Paleozoic youngs progressively from north to south. The branch ocean basins of the eastern PAO closed from west to east in a scissor-like manner. A bi-directional subduction regime dominated during the narrowing and closure process of the eastern PAO, which led to “soft collision” of tectonic units on each side, forming huge accretionary orogenic belts in central Asia.©2022 China Geology Editorial Office. 相似文献
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位于中亚造山带东段的中国东北地区由众多微地块拼合而成,但各地块间的拼贴时间、位置和演化过程一直是地学界争议的关键科学问题.针对大兴安岭中段蘑菇气地区晚石炭世-早二叠世宝力高庙组砂岩开展了详细的岩相学、碎屑锆石LA-ICP-MS U-Pb年代学研究,分析了砂岩母岩区大地构造背景,进而约束兴安地块与松辽地块的汇聚过程.研究结果表明,砂岩具有成分成熟度低、近源快速沉积特点,碎屑骨架成分显示了火成岩区物源供给.锆石颗粒CL图像、Th/U值及REE特征均指示了锆石为岩浆成因.测试样品中锆石U-Pb年龄主要集中在282~360 Ma（n=134）,峰值年龄约为290 Ma、305 Ma、325 Ma和350 Ma.结合区域内前人的研究成果,暗示了其物源可能来自蘑菇气-嫩江-黑河一线的晚古生代俯冲-同碰撞期岩浆弧;样品中最年轻的锆石U-Pb年龄分别为282±4 Ma（样品15MG10）和287±4 Ma（样品15MG11）,可以限定砂岩的沉积下限为早二叠世.对比索伦-蘑菇气地区晚石炭世-早三叠世砂岩的碎屑锆石年龄组成,发现兴安地块内晚石炭世-早二叠世碎屑组分与松辽地块内中二叠世-早三叠世碎屑组分基本相同,说明兴安地块与松辽地块已于晚石炭世前沿贺根山-黑河缝合带完成拼合. 相似文献
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新疆博格达山主体由石炭系海相火山一沉积岩系组成,以发育两期双峰式火山岩,但不发育花岗岩为特征,对其晚古生代地层时代的划分和演化争议较大。本文重点对博格达山北部两个晚古生代砂岩进行了碎屑锆石U-Pb年代学分析,重新标定博格达山地区晚古生代地层的形成时代;利用物源区的演化,约束晚古生代构造演化。测年结果显示博格达上亚群砂岩的碎屑锆石表面年龄值分布范围较宽,主峰年龄为343~284 Ma(80%),次峰年龄为386~375 Ma(3%)、503~441Ma(7%)和871~735 Ma(10%);芦草沟组砂岩的碎屑锆石表面年龄值非常集中,主峰年龄为358~279 Ma(97%),次峰年龄为257~251 Ma(约3%)。博格达山中部原石炭纪博格达群上亚群与西部和南部下芨芨槽群相当,应属于早二叠世,中部一东部的石炭一二叠纪界线应在博格达下亚群一上亚群或居里得能组一沙雷塞尔克组之间的不整合面之中。博格达北部地区晚二叠世以南侧天山物源区供给为主,反映出晚古生代期间博格达山地区至少存在晚石炭世末和中二叠世两期构造隆升。结合区域火山岩与火山碎屑岩的研究,认为博格达山地区晚古生代主要经历4个演化阶段:早石炭世弧后盆地裂解阶段、晚石炭世碰撞拼贴阶段、早二叠世碰撞后伸展阶段、中-晚二叠世再次隆升到稳定阶段。 相似文献
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佳木斯地块及邻区早古生代——晚中生代构造演化 总被引：1，自引：0，他引：1
为厘清嘉荫—牡丹江缝合带的形成时代,确定佳木斯地块早古生代—晚中生代构造演化过程,笔者对佳木斯地块及邻区出露的一些特征岩石的相关资料进行了收集与系统分析。分析结果显示,黑龙江杂岩外来岩块原岩具有类似蛇绿岩的特征,锆石U--Pb年龄结果显示其形成时代为257～210 Ma,云母及蓝闪石Ar--Ar年龄显示基质与外来岩块共同发生高压变质与退变质事件的时间为193～145 Ma,结合出露于佳木斯地块与松嫩地块的早古生代-早侏罗世火成岩地球化学特征及锆石U-Pb年龄,提出佳木斯地块与松嫩地块间经历了早古生代拼合—二叠纪末期三叠纪裂解—侏罗纪-白垩纪初期再次拼合的构造演化过程。古太平洋板块向西的俯冲作用,驱动了其最终的拼合,形成了以黑龙江杂岩为标志的嘉荫—牡丹江缝合带。 相似文献
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北山红石山地区晚古生代火山岩LA-ICP-MS锆石U-Pb年龄及其构造意义 总被引：17，自引：4，他引：13
北山地区古亚洲洋的闭合时间和晚古生代构造演化倍受关注且久有争议.晚古生代地层及其接触关系对探讨以上问题具有重要意义,但该区地层学研究薄弱,很大程度上制约了对构造演化的深入讨论.本文获得的北山红石山地区上古生界“下石炭统绿条山组、白山组”和“下二叠统双堡塘组”火山岩的LA-ICP-MS锆石U-Pb年龄,分别为296.8±3.5Ma、314.9±3.3Ma和299.4±5.9Ma,时代为晚石炭世-早二叠世,相当于北山地区干泉组层位.原“白山组”与“双堡塘组”之间的平行不整合不成立,表明石炭纪-二叠纪为同期裂谷盆地.原“绿条山组”与中泥盆统的角度不整合实为干泉组与中泥盆统的角度不整合,代表了古亚洲洋的闭合与增生造山时间发生在中泥盆世与早石炭世之间. 相似文献
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东北地区主要由东部佳木斯地块、中部兴安—松嫩地块和西部额尔古纳地块构成,各地块之间主要构造带拼合时代的研究表明,晚古生代之前各地块之间已经完成拼合,形成了统一的佳—蒙地块。晚古生代开始东北地区进入统一的盖层演化阶段,在佳—蒙地块南缘发育了晚古生代具有大陆边缘沉积特征的盖层建造。晚古生代早期佳—蒙地块南缘为活动陆缘,在～320Ma向北的俯冲过程中古亚洲洋板块发生断离,形成火山弧,同时导致其北侧"贺根山"弧后洋的拉开,持续的向北俯冲导致弧-陆碰撞,并于～280Ma贺根山洋已经完全闭合。佳—蒙地块南缘开始由活动陆缘向被动陆缘环境转化,最后在晚二叠世末期古亚洲洋完全闭合转入内陆环境。 相似文献
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中亚造山带东段晚古生代伸展构造环境的证据:内蒙古双井地区哲斯组沉积学及年代学研究 总被引：2，自引：1，他引：1
本研究从沉积学与年代学角度切入,聚焦于中亚造山带东段晚古生代末期的演化历史。以内蒙古双井地区中二叠统哲斯组陆源粗碎屑沉积岩为研究对象,利用沉积剖面实测、岩相古地理分析及锆石年代学测试等方法,厘定其沉积时限与沉积构造环境,以探讨晚古生代末期中亚造山带东段的构造演化历史。来自哲斯组的2个砂岩样品的最年轻谐和锆石组的谐和年龄分别258. 1±1. 9Ma与261. 6±1. 7Ma,在误差范围内相等,限定了研究区内哲斯组地层的最大沉积年龄约为260Ma,处于中二叠世末的Capitanian期;其主要物质来源包括华北板块太古代至早元古代的结晶基底、华北板块北缘早古生代陆缘弧及中-晚泥盆世西别河组。碎屑锆石年代学与沉积学研究表明,研究区内哲斯组所处沉积盆地类型为伸展构造环境下的裂谷盆地,早期具有短时间内快速充填巨厚层粗碎屑沉积的补偿盆地特征,并伴有活跃的同沉积火山与构造活动,发育近岸水下扇相沉积;晚期逐渐转变为过补偿盆地,发育陆相干旱型冲积扇相沉积;表现出沉积环境由海相变为陆相、碎屑物供应充足且近源低成熟度碎屑增多的盆地充填过程。根据沉积相组合及展布、沉积年龄与碎屑锆石主要结晶年龄间隔等特征,结合研究区存在双峰式火山岩及碱性岩带等证据,哲斯组应代表晚古生代末期的裂谷盆地沉积。上述研究提供了中亚造山带东段二叠纪发生陆内伸展过程的证据。 相似文献
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《地学前缘(英文版)》2020,11(6):1975-1992
The early Paleozoic tectonic framework and evolutionary history of the eastern Central Asian Orogenic Belt (CAOB) is poorly understood. Here we present zircon U–Pb geochronology, whole rock geochemistry, and Sr-Nd-Hf isotope data of the early Paleozoic granitoids in eastern CAOB to investigate the petrogenesis and geodynamic implications.The early Paleozoic granitoids from the Songnen Block yield zircon U–Pb ages of 523–490 Ma, negative εNd(t) values of –6.7 to –0.8, and εHf(t) values of –8.6 to 7.1, indicating they were generated by partial melting of ancient crustal materials with various degrees of mantle contribution. They generally show affinities to A-type granites, implying their generation from an extensional environment after the collision between the Songnen and Jiamusi blocks. In comparison, the early Paleozoic granitoids from the Xing’an Block have zircon U–Pb ages of 480–465 Ma, εNd(t) values of –5.4 to 5.4, and εHf(t) values of –2.2 to 12.9, indicating a dominated juvenile crustal source with some input of ancient crustal components. They belong to I-type granites and were likely related to subduction of the Paleo-Asian Ocean. The statistics of TDM2 Hf model ages of the granitoids indicate that the Erguna and Jiamusi blocks contain a significant proportion of Mesoproterozoic crystalline basement, while the Xing’an Block is dominated by a Neoproterozoic basement.Based on these observations, the early Paleozoic evolutionary history of eastern CAOB can be divided into four stages: (1) before 540 Ma, the Erguna, Xing’an, Songnen, and Jiamusi blocks were discrete microcontinents separated by different branches of the Paleo-Asian Ocean; (2) 540–523 Ma, the Jiamusi Block collided with the Songnen Block along the Mudanjiang suture; (3) ca. 500 Ma, the Erguna Block accreted onto the Xing’an Block along the Xinlin–Xiguitu suture; (4) ca. 480 Ma, the Paleo-Asian Ocean started a double-side subduction beneath the united Erguna–Xing’an and Songnen–Jiamusi blocks. 相似文献
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前人对张广才岭福兴屯组研究程度较低,限制了对区域古生代构造演化的认识.福兴屯组凝灰岩锆石30个测点加权平均年龄为392±3 Ma,砂岩碎屑锆石最小一组年龄为393 Ma,指示福兴屯组形成于中泥盆世.Al2O3/TiO2平均值为19.58,稀土元素球粒陨石标准化曲线具有轻稀土富集、重稀土稳定和负Eu异常特征,结合碎屑锆石年龄峰值,确定福兴屯组物源主要为晚古生代中酸性火成岩和早古生代花岗质岩.地球化学和区域火山岩特征共同揭示福兴屯组形成于伸展构造环境.松嫩-张广才岭地块和佳木斯地块晚古生代早期地层均广泛分布有489~551 Ma的碎屑锆石,暗示两地块在福兴屯组沉积之前已完成拼合,为两地块于早古生代晚期拼合提供了新的证据. 相似文献
15.
东北地块群:构造演化与古大陆重建 总被引：7，自引：0，他引：7
东北地区位于西伯利亚板块、华北板块和太平洋板块之间,为"中亚造山带"的东段和太平洋构造域的叠加部位,因此东北地块群构造属性和背景的研究对深入探讨二大构造域的叠加与转化背景具有重要的理论意义。东北地块群从东到西可细分佳木斯兴凯、松辽、兴安和额尔古纳四大地块,这些地块具有相同的新元古代泛非期变质基底,而古生代沉积岩也存在一定的可比性,表明这些地块存在相同或者相似的构造演化背景。分割这些地块的构造边界特征为:1）额尔古纳与兴安地块的缝合带为早古生代头道桥-新林缝合带,而非中生代德尔布干断裂;2）兴安地块与松辽地块之间的贺根山黑河缝合带形成时代为晚石炭世（330~300 Ma）,而非最近报道的中生代;3）古亚洲洋分布在东北陆块群与华北板块之间,沿西拉木伦-长春缝合带闭合,时代为三叠纪;4）佳木斯兴凯地块与松辽地块之间的吉黑高压带形成于古亚洲构造域与环太平洋构造域转换的关键时期（210~180 Ma）;5）那丹哈达增生杂岩为中国境内古太平洋板块俯冲增生的唯一直接证据,并记录了晚三叠早白垩世古太平洋板块向欧亚大陆俯冲增生的过程。在此基础上,分析了东北地块群发育的典型古生物和年代学标志,重建了东北地块群从Gondwana 大陆到Pangea大陆的位置与模型。 相似文献
16.
本文选取内蒙古苏尼特右旗地区石炭-二叠纪地层及火山岩为研究对象,通过典型地层剖面测制、锆石U-Pb年代学、古生物和地球化学等方法,查明其形成时代、物质来源及沉积环境,并进一步探讨兴蒙造山带中段南缘晚古生代的演化过程。本巴图组2个碎屑岩样品最小年龄为299Ma和296Ma,结合古生物化石研究,其形成时代应为晚石炭-早二叠世;三面井组2个碎屑岩样品的最小年龄为271Ma和272Ma,同样结合其古生物化石资料,判断其形成时代为早-中二叠世。锆石组成和岩相特征显示本巴图组和三面井组形成于不同的沉积背景之下。本巴图组的沉积相变化显示为一个海进序列,形成于弧后伸展背景之下;三面井组则与之相反,显示沉积环境由稳定变为活动,形成于汇聚背景之下。安山岩的喷出年龄为277±1.4Ma,有着高镁安山岩的属性,显示出俯冲背景下陆缘弧火山岩的特征。结合以往区域地质资料,我们认为晚古生代兴蒙造山带南缘的构造演化过程可分为五个阶段:(1)泥盆纪,碰撞后伸展阶段;(2)早石炭世,俯冲开始阶段;(3)晚石炭,俯冲不强烈、局部发生伸展作用阶段,以本巴图组和阿木山组的碎屑岩-碳酸盐组合为代表;(4)早中二叠世,俯冲加强阶段,发育三面井组和大量的陆缘弧火山岩,此时古亚洲洋仍然存在;(5)晚二叠世之后,碰撞结束、古亚洲洋消失阶段,区域开始出现大量A型花岗岩,整体进入造山后环境。 相似文献
17.
LI Yilong WANG Guoqing XIAO Wenjiao ZOU Jing ZHENG Jianping Fraukje M. BROUWER 《《地质学报》英文版》2019,93(5):1228-1260
The Solonker suture zone has long been considered to mark the location of the final disappearance of the PaleoAsian Ocean in the eastern Central Asian Orogenic Belt(CAOB). However, the time of final suturing is still controversial with two main different proposals of late Permian to early Triassic, and late Devonian. This study reports integrated wholerock geochemistry and LA-ICP-MS zircon U-Pb ages of sedimentary rocks from the Silurian Xuniwusu Formation, the Devonian Xilingol Complex and the Permian Zhesi Formation in the Hegenshan-Xilinhot-Linxi area in central Inner Mongolia, China. The depositional environment, provenance and tectonic setting of the Silurian-Devonian and the Permian sediments are compared to constrain the tectonic evolution of the Solonker suture zone and its neighboring zones. The protoliths of the silty slates from the Xuniwusu Formation in the Baolidao zone belong to wacke and were derived from felsic igneous rocks with steady-state weathering, poor sorting and compositional immaturity. The protoliths of metasedimentary rocks from the Xilingol Complex were wackes and litharenites and were sourced from predominantly felsic igneous rocks with variable weathering conditions and moderate sorting. The Xuniwusu Formation and Xilingol Complex samples both have two groups of detrital zircon that peak at ca. 0.9–1.0 Ga and ca. 420–440 Ma, with maximum deposition ages of late Silurian and middle Devonian age, respectively. Considering the ca. 484–383 Ma volcanic arc in the Baolidao zone, the Xuxiniwu Formation represents an oceanic trench sediment and is covered by the sedimentary rocks in the Xilingol Complex that represents a continental slope sediment in front of the arc. The middle Permian Zhesi Formation metasandstones were derived from predominantly felsic igneous rocks and are texturally immature with very low degrees of rounding and sorting, indicating short transport and rapid burial. The Zhesi Formation in the Hegenshan zone has a main zircon age peak of 302 Ma and a subordinate peak of 423 Ma and was deposited in a back-arc basin with an early marine transgression during extension and a late marine regression during contraction. The formation also crops out locally in the Baolidao zone with a main zircon age peak of 467 Ma and a minor peak of 359 Ma, and suggests it formed as a marine transgression sedimentary sequence in a restricted extensional basin and followed by a marine regressive event. Two obvious zircon age peaks of 444 Ma and 280 Ma in the Solonker zone and 435 Ma and 274 Ma in Ondor Sum are retrieved from the Zhesi Formation. This suggests as a result of the gradual closure of the Paleo-Asian Ocean a narrow ocean sedimentary environment with marine regressive sedimentary sequences occupied the Solonker and Ondor Sum zones during the middle Permian. A restricted ocean is suggested by the Permian strata in the Bainaimiao zone. Early Paleozoic subduction until ca. 381 Ma and renewed subduction during ca. 310–254 Ma accompanied by the opening and closure of a back-arc basin during ca. 298–269 Ma occurred in the northern accretionary zone. In contrast, the southern accretionary zone documented early Paleozoic subduction until ca. 400 Ma and a renewed subduction during ca. 298–246 Ma. The final closure of the Paleo-Asian ocean therefore lasted at least until the early Triassic and ended with the formation of the Solonker suture zone. 相似文献
18.
ZHANG Shaohu LIU Chiyang YANG Minghui WANG Jianqiang BAI Jianke Huang Hexin 《《地质学报》英文版》2019,93(4):845-856
Multi-dating on the same detrital grains allows for determining multiple different geo-thermochronological ages simultaneously and thus could provide more details about regional tectonics. In this paper, we carried out detrital zircon fission-track and U-Pb double dating on the Permian-Middle Triassic sediments from the southern Ordos Basin to decipher the tectonic information archived in the sediments of intracratonic basins. The detrital zircon U-Pb ages and fission-track ages, together with lag time analyses, indicate that the Permian-Middle Triassic sediments in the southern Ordos Basin are characterized by multiple provenances. The crystalline basement of the North China Craton (NCC) and recycled materials from pre-Permian sediments that were ultimately sourced from the basement of the NCC are the primary provenance, while the Permian magmatites in the northern margin of NCC and Early Paleozoic crystalline rocks in Qinling Orogenic Collage act as minor provenance. In addition, the detrital zircon fission-track age peaks reveal four major tectonothermal events, including the Late Triassic-Early Jurassic post-depositional tectonothermal event and three other tectonothermal events associated with source terrains. The Late Triassic-Early Jurassic (225–179 Ma) tectonothermal event was closely related to the upwelling of deep material and energy beneath the southwestern Ordos Basin due to the coeval northward subduction of the Yangze Block and the following collision of the Yangze Block and the NCC. The Mid-Late Permian (275–263 Ma) tectonothermal event was associated with coeval denudation in the northern part of the NCC and North Qinling terrane, resulting from the subduction of the Paleo-Asian Ocean and Tethys Ocean toward the NCC. The Late Devonian-early Late Carboniferous (348±33 Ma) tectonothermal event corresponded the long-term denudation in the hinterland and periphery of the NCC because of the arc-continent collisions in the northern and southern margins of the NCC. The Late Neoproterozoic (813–565 Ma) tectonothermal event was associated with formation of the Great Unconformity within the NCC and may be causally related to the Rodinia supercontinent breakup driven by a large-scale mantle upwelling. 相似文献
19.
With the aim of constraining the influence of the surrounding plates on the Late Paleozoic–Mesozoic paleogeographic and tectonic evolution of the southern North China Craton (NCC), we undertook new U–Pb and Hf isotope data for detrital zircons obtained from ten samples of upper Paleozoic to Mesozoic sediments in the Luoyang Basin and Dengfeng area. Samples of upper Paleozoic to Mesozoic strata were obtained from the Taiyuan, Xiashihezi, Shangshihezi, Shiqianfeng, Ermaying, Shangyoufangzhuang, Upper Jurassic unnamed, and Lower Cretaceous unnamed formations (from oldest to youngest). On the basis of the youngest zircon ages, combined with the age-diagnostic fossils, and volcanic interlayer, we propose that the Taiyuan Formation (youngest zircon age of 439 Ma) formed during the Late Carboniferous and Early Permian, the Xiashihezi Formation (276 Ma) during the Early Permian, the Shangshihezi (376 Ma) and Shiqianfeng (279 Ma) formations during the Middle–Late Permian, the Ermaying Group (232 Ma) and Shangyoufangzhuang Formation (230 and 210 Ma) during the Late Triassic, the Jurassic unnamed formation (154 Ma) during the Late Jurassic, and the Cretaceous unnamed formation (158 Ma) during the Early Cretaceous. These results, together with previously published data, indicate that: (1) Upper Carboniferous–Lower Permian sandstones were sourced from the Northern Qinling Orogen (NQO); (2) Lower Permian sandstones were formed mainly from material derived from the Yinshan–Yanshan Orogenic Belt (YYOB) on the northern margin of the NCC with only minor material from the NQO; (3) Middle–Upper Permian sandstones were derived primarily from the NQO, with only a small contribution from the YYOB; (4) Upper Triassic sandstones were sourced mainly from the YYOB and contain only minor amounts of material from the NQO; (5) Upper Jurassic sandstones were derived from material sourced from the NQO; and (6) Lower Cretaceous conglomerate was formed mainly from recycled earlier detritus.The provenance shift in the Upper Carboniferous–Mesozoic sediments within the study area indicates that the YYOB was strongly uplifted twice, first in relation to subduction of the Paleo-Asian Ocean Plate beneath the northern margin of the NCC during the Early Permian, and subsequently in relation to collision between the southern Mongolian Plate and the northern margin of the NCC during the Late Triassic. The three episodes of tectonic uplift of the NQO were probably related to collision between the North and South Qinling terranes, northward subduction of the Mianlue Ocean Plate, and collision between the Yangtze Craton and the southern margin of the NCC during the Late Carboniferous–Early Permian, Middle–Late Permian, and Late Jurassic, respectively. The southern margin of the central NCC was rapidly uplifted and eroded during the Early Cretaceous. 相似文献
20.
黑龙江杂岩主要出露在佳木斯地块西缘,沿牡丹江断裂分布,为佳木斯地块与松嫩地块拼合过程中形成的构造混杂岩.杂岩以强烈变形的长英质糜棱岩为主体,其中含有大量具洋壳性质的超基性岩、变基性熔岩（蓝片岩）及变硅质岩和大理岩等岩块或岩片.对出露于黑龙江省东部牡丹江地区的长英质糜棱岩进行了锆石LA-ICP-MS研究.获得两组206Pb/238U年龄数据,其加权平均年龄分别为509.4±7.1 Ma（n=9,MSWD=1.3）和269±1.9 Ma（n=22,MSWD=0.93）.其中最老2 420和2 459 Ma锆石年龄的出现,表明杂岩中有来自古元古界古老物质;509 Ma左右是佳木斯地块中麻山群的高级变质和花岗质岩浆作用年龄;约269 Ma年龄说明黑龙江杂岩变形基质形成于晚二叠世之后,可能与晚古生代古亚洲洋闭合事件相关. 相似文献