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1.
Two new tetrapod burrow casts from the Naobaogou Formation （Middle or Late Permian） of Nei Mongol,China are described.It marks the first pre-Cenozoic tetrapod burrow from China,and one of the earliest records of tetrapod burrows.Comparison to other Permian and Triassic burrows suggests that these burrows were created by tetrapod slightly smaller than Lystrosaurus.Deduced from the morphology and sizes of two burrows and known tetrapods of the Naobaogou Formation,the burrow should be the production of a therapsid,most likely a dicynodon.These burrows indicate a seasonal climate and this area was semiarid or arid during that time. 相似文献
2.
The early stage of Sichuan Basin formation was controlled by the convergence of three major Chinese continental blocks during the Indosinian orogeny that include South China,North China,and Qiangtang blocks.Although the Late Triassic Xujiahe Formation is assumed to represent the commencement of continental deposition in the Sichuan Basin,little research is available on the details of this particular stratum.Sequence stratigraphic analysis reveals that the Xujiahe Formation comprises four third-order depositional sequences.Moreover,two tectono-sedimentary evolution stages,deposition and denudation,have been identified.Typical wedge-shaped geometry revealed in a cross section of the southern Sichuan Basin normal to the Longmen Shan fold-thrust belt is displayed for the entire Xujiahe Formation.The depositional extent did not cover the Luzhou paleohigh during the LST1 to LST2 （LST,TST and HST mean Iowstand,transgressive and highstand systems tracts,1,2,3 and 4 represent depositional sequence 1,2,3 and 4）,deltaic and fluvial systems fed sediments from the Longmen Shan belt,Luzhou paleohigh,Hannan dome,and Daba Shan paleohigh into a foreland basin with a centrally located lake.The forebulge of the western Sichuan foreland basin was located southeast of the Luzhou paleohigh after LST2.According to the principle of nonmarine sequence stratigraphy and the lithology of the Xujiahe Formation,four thrusting events in the Longmen Shan fold-thrust belt were distinguished,corresponding to the basal boundaries of sequences 1,2,3,and 4.The northern Sichuan Basin was tilted after the deposition of sequence 3,inducing intensive erosion of sequences 3 and 4,and formation of wedge-shaped deposition geometry in sequence 4 from south to north.The tilting probably resulted from small-scale subduction and exhumation of the western South China block during the South and North China block collision. 相似文献
3.
Ammonoid Succession of Setorym River （Verkhoyansk Area） and Problem of Permian—Triassic Boundary in Boreal Realm 总被引：4，自引：0，他引：4
YuriDZakharov 《中国地质大学学报(英文版)》2002,13(2):107-123
The presence of a single Otoceras species (O.boreale), morphologically very variable, at the base of the Nekuchan Formation in Verkhoyansk, we believe, is to be obvious. Some morphological evidence leaves no doubt that two described morphs of O. boreale are s strictly corresponding sexual dimorphic pair. It is very likely that Kummel‘s idea that Canadian. O. concavum Tozer is an invalid species is truthful, considering the range of variability seen in larger Siberian and Himalayan Otoceras fauna. Just above the upper Tatarian Imtachan Formation, the six stages of ammonoid succession can be recognized within the lower part of the Nekuchan Formation in the Setorym River Section:(a) Otoceras boreale;(b) Otoceras boreale-Tompophiceras pascoei; (c) Otoceras boreale-Tompophiceras pascoei-Aldanoceras;(d)Tompophiceras pascoei-Otoceras boreale-Aldanoceras;(e) Tompophiceras morpheous-T.pascoei-Aldanoceras;(f) Tompophiceras more pheous-T.pascoei-Wordieoceras domokhotovi-Ophiceras transitorium;(g)Tompophiceras morpheous-T.pascoei, corresponding to the Otoceras boreale and Tompophiceras morpheous zones. In spite of the domination of Otocerataceae or Xenodiscaceae in both oif these zones and the presence of some Permian type conodonts in the lower part of the Otoceras boreale Zone, they seem to be early Induan in age on the basis of the following arguments:(1) in contrast to the underlying regressive type sediments of the Upper Tatarian Imtachan Formation, both the Otoceras boreale and the Tompophiceras morpheous zones of the lowermost part of the Nekuchan Formation correspond to the single transgressive cycle;(2)typical early Induan ammonoids (Ophiceras and Wordieoceras) have been recognized in the Tompophiceras morpheous zone; (3) all described ammonoid succession stages (a-g) are characterized by very gradual changes and therefore correspond to the different parts of the single zone or to the different zones of the same stage, but not to the different systems (Permian and Triassic);(4)elsewhere in the Boreal realm (Arctic Canada), the conodont index species for the base of the Triassic, Hindeodus parvus, has been reported from the Otoceras boreale Zone. A new scheme of the phylogeny for the Otocerataceae and its Induan-Olenekian offspring (Araxceratidae-Otoceratidae-Vavilovitidae n.fam.-Proptychitidae-Arctoceratidae) and Xenodiscaceae is offered. 相似文献
4.
MeiMingxiang MaYongsheng DengJun GaoJinhan ChenHuijun MengQingfen LiDonghai 《中国地质大学学报(英文版)》2003,14(2):103-118
There are complex and regular changes on sedimentary facies from the Early to the Middle Triassic in the Nanpanjiang basin. After the obvious drowned event of carbonate platforms in the transitional period between Permian and Triassic, carbonate platforms have evolved into the ramp type from the rimmed-shelf type. The differentiation of sedimentary facies becomes dearer in space, which are marked by the changes from an attached platform to a turbidity basin and several isolated platforms in the basin. The striking characteristics are the development of oolitic banks on isolated platforms in Nanning and Jingxi and the reef- and bank-limestones in the margin of the attached platform in the Early Triassic. Despite the difference of the time-span and the architectnre of fades succession of third-order sedimentary sequences, the process of the third-order relative sea-level changes reflected by the sedimentary facies succession of the third-order sequences is generally synchronous. Therefore, six third-order sequences could be discerned in the strata from the Early to the Middle Triassic in the Nanpanjiang basin. Using two types of facies changing surfaces and two types of diachronisms in stratigraphic records as the key elements, the sedimentary facies architectures of the third-order sequences that represent sequence stratigraphic frameworks from the Early to the Middle Triassic in the Nanpanjiang basin could be constructed. 相似文献
5.
MEI Mingxiang 《《地质学报》英文版》2008,82(2):295-309
In the long Precambrian period, stromatolitic carbonate successions were very common. However, the non-stromatolitic carbonate succession that is marked by subtidal deposits shows a sharp contrast to the stromatolitic carbonate succession. Both the non-stromatolitic and the stromatolitic carbonate successions are important clues for the further understanding of the evolving carbonate world of the Precambrian. The Mesoproterozoic Gaoyuzhuang Formation at the Qiangou section in northwestern suburb of Beijing is a set of more than 1000 m-thick carbonate strata that can be divided into four members （or subformations）, in which a non-stromatolitic carbonate succession marked by the scarcity of stromatolites makes up the third member of the formation. This non-stromatolitic carbonate succession can further be subdivided into three third-order sequences that are marked by the regular succession of sedimentary facies. In third-order sequences, a lot of subtidal carbonate meter-scale cycles made up of medium-bedded leiolite limestones and thin-bedded marls constitute their transgressive system tracts （TSTs） and the early high-stand system tracts （EHSTs）, a lot of meter- scale cycles made up by thin-bedded limestones and marls constitute their condensed sections （CSs）, and thick-bedded to massive dolomitic limestones or lime dolomites make up the late high-stand system tracts （LHSTs）. The particularly non-stromatolitic carbonate succession making up the third member of the Mesoproterozoic Gaoyuzhuang Formation at the Qiangou section might be the representative of the non-stromatolitic carbonate succession of the Precambrian because of its special lithological features and particular sedimentary structures, and its general sedimentary features are helpful and meaningful for the further understanding of the evolution rules of the sophisticate and evolving carbonate world of the Precambrian. The time scale of the Gaoyuzhuang Formation is deduced as that from 1600 Ma to 1400 Ma; thus, the non-stromatolitic 相似文献
6.
Wang Yue Wang Jing CHEN Jun WANG Weijie Shen Shuzhong Charles M. HENDERSON 《《地质学报》英文版》2011,85(2):387-398
The Kungurian Stage is one of the three remaining stages of the Permian that is not yet defined at the base by a Global Stratotype Section and Point (GSSP). The candidate section at the Yuryuzan’River in the Urals yields few conodonts, and contains non-marine sediments near the boundary. The search for a suitable, continuous marine succession is a principal task for the Subcommission on Permian Stratigraphy. The Leonardian, with its type area in the southwest United States, and in objective stratigraphic succession directly beneath the basal Guadalupian Roadian Stage, has priority to serve as a subseries of the Lower Permian. However, distinct provincialism limits the correlation of Leonardian fossil zones with the fusuline-based Tethyan timescale. Conodonts can be correlated in many important regions on opposite sides of Pangea, yet contradictions arise when relating conodont zones with fusuline and ammonoid zones. The different taxonomic philosophies are highly suspected for the cause of the conflicts, but also there are different conodonts from the type Roadian in West Texas. Given that the Pamir and Darvaz in central Asia are difficult to access, further investigations should focus on South China, where abundant fusulines and ammonoids facilitate correlation throughout the Tethyan region, and where conodonts permit correlation with North America. 相似文献
7.
Hydrodynamic Evolution and Hydrocarbon Accumulation in the Dabashan Foreland Thrust Belt,China 总被引：1，自引：0，他引：1
There are two plays in the Dabashan foreland tectonic belt: the upper and the lower plays. The lower play experienced one sedimentary hydrodynamic stage, two burial hydrodynamic stages, two tectonic hydrodynamic stages and two infiltration hydrodynamic stages from the Sinian to the Cenozoic, while the upper play had one sedimentary hydrodynamic stage, one burial hydrodynamic stage, two tectonic hydrodynamic stages and one infiltration hydrodynamic stage from the Permian to the Cenozoic. Extensive flows of both sedimentary water, including hydrocarbons, and deep mantle fluid occurred in the Chengkou faults during collision orogeny in the Middle-Late Triassic Indosinian orogeny, and fluid flow was complicated during intracontinental orogeny in the Middle-Late Jurassic. In addition to these movements, infiltration and movement of meteoric water took place in the Chengkou faults, whereas in the covering-strata decollement tectonic belt, extensive sedimentary water flow (including hydrocarbons) occurred mainly in the Zhenba and Pingba faults. During the stage of rapid uplift and exhumation from the Cretaceous to the Cenozoic, the fluid flow was characterized mainly by infiltration of meteoric water and gravity-induced flow caused by altitude difference, whereas sedimentary water flow caused by tectonic processes was relatively less significant. Sedimentary water flow was more significant to the lower play in hydrocarbon migration and accumulation during collision orogeny in the Middle-Late Triassic Indosinian orogeny, but its influence is relatively slight on the upper play. On one hand, hydrodynamics during intracontinental orogeny in the Middle-Late Jurassic adjusted, reformed or oven destroyed oil reservoirs in the lower play; on the other hand, it drove large amounts of hydrocarbons to migrate laterally and vertically and is favorable for hydrocarbon accumulation. Infiltration hydrodynamics mainly adjusted and destroyed oil reservoirs from the Cretaceous to the Cenozoic. 相似文献
8.
Sequence stratigraphical analysis was applied to the Upper Carboniferous–Lower Permian sedimentary succession of the northeastern Ordos Basin, north China based on data acquired from ten entire logging curves and eight outcrops. The facies framework of the lithostratigraphical unit, the Taiyuan Formation comprises seven facies in two facies associations, varying from fluvio-delta to shelf-barrier islands. The facies are presented within a chronostratigraphical framework, linked by systems tract, which in turn are limited by flooding surfaces and sequence boundaries. Six third-order depositional sequences are recognised, bounded by six type 2 unconformities. An upwards-shallowing epicontinental sea sedimentary model is created, which consists of a sandstone, coal seam and carbonate succession. 相似文献
9.
<正>Sequence stratigraphical analysis was applied to the Upper Carboniferous-Lower Permian sedimentary succession of the northeastern Ordos Basin,north China based on data acquired from ten entire logging curves and eight outcrops.The facies framework of the lithostratigraphical unit,the Taiyuan Formation comprises seven facies in two facies associations,varying from fluvio-delta to shelf-barrier islands.The facies are presented within a chronostratigraphical framework,linked by systems tract,which in turn are limited by flooding surfaces and sequence boundaries.Six third-order depositional sequences are recognised,bounded by six type 2 unconformities.An upwards-shallowing epicontinental sea sedimentary model is created,which consists of a sandstone,coal seam and carbonate succession. 相似文献
10.
Sequence Stratigraphy of the Permian--Triassia Boundary Section of Changxing, Zhejiang, Southern China 总被引：1，自引：0，他引：1
Zhang Kexin Tong Jinnan Yin Hongfu Wu Shunbao China University of Geosciences Wuhan Hubei 《《地质学报》英文版》1997,71(1):90-103
Three third-order sequences and about one hundred high-frequency cycles or Milankovitchcycles within the Late Permian Changxingian to Early Triassic Griesbachian are identified in theMeishan Section of Changxing, Zhejiang Province, southern China, the candidate stratotype sec-tion of the global Permo-Triassic boundary, based on a detailed study of the biological,ecological and high-resolution allochthonous cyclic events, microfacies and depositional systems.Furthermore, the stacking pattern of the depositional systems across various Changxingian andGriesbachian sedimentary facies of the Lower Yangtze and the sequence stratigraphic frameworkare outlined with the Meishan section as the principal section. In this paper the habitat types offossil biota are applied to semiquantitative palaeobathymetry and the study of relative sea levelchanges. 相似文献
11.
中下扬子区二叠系露头层序地层研究 总被引：15，自引：1，他引：15
按新近国际年代地层划分方案（ICS，2000），下扬子区二叠纪地层自下向上分为3统，9阶和相对应的华南传统6阶划分。二叠系从阿瑟尔阶至长兴阶（44Ma)共划分出14个三级层序，每个三级层序平均时限约为3.14Ma，其中“紫松阶”）相当阿瑟尔＋2／3萨克马尔阶）1个（船山组中上部）、“隆林阶、（相当1／3萨克马尔阶＋阿丁斯克阶）2个（分别对应船山组上部和梁山组或镇江组）、“栖霞阶”（相当库班甘德阶＋1／3罗德阶）3个（栖霞组），“茅口阶”（相当于2／3罗德阶＋沃德阶＋卡皮丹阶）4个（孤峰组，茅口组，堰桥组，银屏组和武穴组），吴家坪阶2个（龙潭组或吴家坪组），长兴阶2个（长兴组或大隆组）；共归并为4个层序组（sequence set)。 相似文献
12.
近年来的研究资料证明,在Misellina claudiae带之下马平组灰岩(船山组)上部,产二叠纪的(竹蜓)类、珊瑚和腕足类,其时代相当于阿舍利阶(Asselian)上部至萨克马尔阶(Sakmarian)和阿丁斯克阶(Artinaskian)的一部分。湖南嘉禾袁家剖面,船山组灰岩上部盛产该期代表分子Mccloudia,许寿永等称Mccioudia带,并以该带的底,视作石炭一二叠系的分界。据此,笔者将嘉禾袁家剖面二叠系的底界,下移到船山组灰岩第六层产Mccloudia带的底。该剖面的船山组灰岩为跨时的岩石地层单位。石炭一二叠系为连续沉积。本文还讨论该剖面与邻区的对比及其古地理环境。 相似文献
13.
黔桂地区石炭系层序地层格架及海平面变化 总被引：8，自引：1，他引：7
从石炭系到下二叠统,构成一个二级层序,其底面为紫云运动主幕不整合面及其相关面,顶界面为黔桂运动不整合面及其相关面,包含6个三级层序。研究区范围内,从连陆台地到孤立台地乃至台沟背景,沉积特征明显不同,如在连陆台地上发育煤系地层并且发育较多的白云岩地层,而在孤立台地上则以大套碳酸盐岩地层为特征,台沟背景中以暗色细粒沉积为主包括台盆相和台棚相沉积。因此,三级沉积层序的相序特征形成有规律的空间变化,虽然在不同的地点三级层序的形成时限和相序组构存在差异,但它们所代表的相对海平面变化过程基本上是同步的。在前人大量的古生物学研究成果的基础上,追索各三级沉积层序界面的空间展布特征,以地层记录中的两种相变面和两种穿时性为基本要素,可以建立黔桂地区石炭系(含下二叠统)的地层层序格架。 相似文献
14.
本文以野外露头观察及录井、测井、地震、古生物等资料为基础,通过岩石地层、测井地层及生物地层等的综合分析,在四川盆地东北部中二叠统地层中识别出4种类型的层序界面:隆升侵蚀不整合面、暴露层序不整合面、海侵上超不整合面及岩性岩相转换面。划分了3个三级层序:SQ1对应梁山组和栖霞组,时限约7Ma;SQ2对应茅口组一段,时限约3Ma;SQ3对应茅口组二段-三段,时限约5Ma。三级层序的平均时限约5Ma。同时,分析了层序对储层的控制作用,其主要体现在两个方面:层序控制了沉积相,影响了储层原生孔隙的发育;碳酸盐岩的发育受三级层序海平面升降控制,优质储层明显受控于海退半旋回。 相似文献
15.
16.
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17.
华南晚中生代构造体制转折结束时限研究——兼与华北燕山地区对比 总被引：24，自引：0，他引：24
中国东部中生代构造体制转折过程及其相应的岩浆作用是当前研究热点。福建是华南中生代多期次火山活动发育最齐全的地区之一,锆石SHRIMP UPb法测年表明：福建分布最广的晚中生代“南园组”火山岩形成时代可明显分为两期,分别为中侏罗世末—晚侏罗世（162.3～149.8Ma）和早白垩世（142.3～130.1Ma）。区域地质构造和地层对比表明,该两期火山岩形成于不同的火山活动旋回和构造背景,不能归入同一地层组中。与华北燕山地区相比较,前者层位相当于髫髻山组,后者层位相当于张家口组,推断它们分别形成于华南构造体制转折最终结束前后。据此提出华南中生代构造体制转折结束于晚侏罗世（149.8～142.3Ma）,也即华南与华北的构造体制转折基本同时结束。 相似文献
18.
湘中地区船山组四射珊瑚新属种 总被引：1，自引：0，他引：1
湘中地区船山组含丰富的四射珊瑚化石,主要为地方性分子,其发展具有明显的阶段性:下部主要为单体双带型珊瑚及互嵌状复体珊瑚;中部以单体三带型珊瑚和Kepingophyllidae科的原始分子繁衍为特征;而在上部,Kepingophyllidae科的进化分子非常繁盛,并出现了一些早二叠世的分子,如Vesotabularia,Lonsdaleiastraea。这些阶段性的变化对揭示石炭纪和二叠纪四射珊瑚的演化具有重要意义。 笔者在船山组中上部建立了两个四射珊瑚组合,自下而上为:（1）Eokepingophyllum-Qinglongshanophyllum组合; （2）Kepingophyllum-Parawentzellophyllum组合。此外,描述1新属Paraivanovia及10新种。 相似文献
19.
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
20.
内蒙古阿拉善北部好比如地区下石炭统好比如组时代修订及其地质意义 总被引：1，自引：0，他引：1
内蒙古阿拉善北部好比如地区地层研究程度较低,好比如组时代久有争议,制约了该区地层层序、沉积建造及构造演化的深入研究。测得好比如地区原定为早石炭世的好比如组碎屑岩LA-ICP-MS锆石U-Pb最小峰值年龄为279Ma,火山岩LA-ICP-MS锆石U-Pb年龄为270.3±2.2Ma,时代应修订为早二叠世空谷期—中二叠世罗德期。结合区域上岩性特征、地层对比及锆石年龄谱对比,将好比如组中段修订为船山统隆林阶—罗甸阶埋汗哈达组(P1-2m),将其上段修订为阳新统祥播阶—冷坞阶阿其德组(P2a)。好比如组的时代修订为研究区晚古生代地层层序、沉积建造及构造演化的研究提供了新的依据。 相似文献