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1.
《地质科技情报》2017,(3)
通过对新疆柯坪地区上石炭统-下二叠统康克林组和巴立克立克组腕足动物化石的系统研究,共鉴定出46属82种,根据垂向分布将腕足动物群划分为5个组合,其中康克林组自下而上划分为Avonia-Dictyoclostus组合,Schizophoria-Brachythyrina组合,Orthotetina-Chonetes组合和Compressoproductus-Enteletes组合;巴立克立克组划分为Plicatifera-Liraplecta组合。区域对比表明,研究区晚石炭世-早二叠世腕足动物群生物古地理区属于特提斯大区,混有少量北方大区冷水型分子,早二叠世混生的冷水型分子较晚石炭世明显增加。从Orthotetina-Chonetes组合开始,明显出现早二叠世分子。腕足动物的演化阶段特征表明,腕足动物群对石炭系-二叠系界线的响应明显滞后于牙形刺和类等生物门类,即明显变化发生在康克林组的中下部。 相似文献
2.
内蒙哲斯腕足动物群混生类型及古气候变化 总被引：2，自引：0，他引：2
根据早二叠世中国腕足动物地理分区和哲斯组腕足动物群中各属在世界的分布,筛选出一些典型冷暖属.据其地层产出特点确定了这个动物群的混生类型,并进一步讨论了哲斯期的古气候变化. 相似文献
3.
通过对华北地台早石炭世晚期至早二叠世腕足动物群的全面系统研究,认为全区腕足动物群的发展演化具有一致性和阶段性,可清楚地分为5个阶段,即田师傅期（C13-C21）、本溪期（C22）、太原期早期（C23）、太原期晚期（P11）和山西期（P12）。在此基础上,进行了国内外同期腕足动物群的对比和腕足动物生物古地理分析,确立了华北地台东北部田师傅期腕足动物的生物地理归属,命名为天山-辽吉腕足动物生物地理分区,同时阐明了研究区内晚石炭世晚期至早二叠世腕足动物生物地理区划特征。 相似文献
4.
姜建军 《沉积与特提斯地质》1997,(21)
滇西保山地区早石炭世生物地层研究姜建军（地质矿产部国际合作司）本文研究了滇西保山早石炭世腕足动物群的分布及特征。笔者根据腕足动物纵向的分布规律，建立了三个腕足类组合，它们分别是岩关阶渔洞组Ｕｎｉｓｐｉｒｉｆｅｒｓｔｒｉａｔｏｃｏｎｖｏｌｕｔｕｓ－Ｍａ... 相似文献
5.
与天山造山带大地构造解释相关的两个地层问题 总被引：1，自引：0，他引：1
综合分析巴音沟蛇绿混杂岩带(以下简称巴音沟混杂带)构造地层组合所含生物化石群性质,认为安集海组不存在特提斯型早石炭世Gigantoproductus为代表的腕足动物群;巴音沟混杂带蛇绿混杂岩上覆磨拉石相地层体,不应引用含义不清、成因和构造关系无直接联系的“科古琴山组”,而应使用同一构造沉积区带、构造相位关系一致、沉积组... 相似文献
6.
内蒙古锡林浩特二叠系哲斯组腕足动物群特征及其意义 总被引：1，自引：0，他引：1
内蒙古锡林浩特克什克腾旗哈尔呼舒剖面哲斯组灰岩中发现了大量腕足化石,经鉴定计有22属42种,以长身贝亚目和石燕贝亚目为主,化石组合面貌具有典型的哲斯动物群特征。根据其与邻区的腕足生物地层对比,确定该腕足生物群时代为中二叠世Wordian期。哲斯动物群中凉水型分子共计10属26种,约占种级总量的61.9%,暖水型分子仅1种,约占种级总量的2.4%,体现了典型的凉水型动物群特征。古生物地理区划属于北方生物地理大区。此外,哲斯组碳酸盐岩中颗粒组合属于苔藓虫-棘皮动物-腕足动物组合,代表凉水沉积环境,也印证了哲斯动物群的凉水型特征。 相似文献
7.
首次在新疆准噶尔盆地西北缘和什托洛盖以北地区的晚泥盆世法门晚期地层中发现板海神石及大型弓海神石菊石动物。板海神石动物群由Platyclymenia （Pl.） subnautilina （Sandberger）、Sporadoceras sp.和Prionoceras frechi （Wedekind）等分子组成;可能与Annulata事件有关。弓海神石动物群中Protactoclymenia sp.和Cyrtoclymeniasp.以壳体硕大为显著特征,直径可达20cm。这些菊石可与西欧晚泥盆世标准菊石带第Ⅳ带的菊石组合进行对比（相当于牙形石Upper trachytera至Lower expansa带）,而且在区域上的分布具有一定的稳定性,尤其是弓海神石动物群,其产出层位可作为和什托洛盖以北地区地层对比的标志层。 相似文献
8.
9.
通过对华北地台河南鹤壁地区太原组有孔虫动物群的系统研究,共鉴定出有孔虫化石18属33种,建立了一个区域性有孔虫动物组合带：Bradyina—Palaeotextularia组合带,根据有孔虫化石的属种类型、数量,应用数理统计方法得出组合带有孔虫化石在地层中的比例变化情况,并根据化石组合带与国内其它地区的有孔虫动物群进行对比研究,认为鹤壁剖面有孔虫动物群Bradyina—Palaeotextularia组合带归于晚石炭世晚期的早期（C2^2-）,进而对研究区石炭-二叠系界线的划分进行探讨,界限应该放在第16层（泥岩）和第15层（灰岩）之间。 相似文献
10.
文中论述和比较分析了贵州紫云扁平早二叠世碳酸盐岩连续沉积剖面腕足动物群扭月贝目（Strophomenida）、长身贝目（Productida）、石燕贝目（Spiriferida）共9科,21属,14种及7个未定种的特征、性质,认为贵州紫云扁平早二叠世腕足动物群属高分异度、热水或暖水（热带或亚热带）性质动物。它们之中的Licharewiellaapiocallosa（Clarke）,Stctozostersp.,Dyschrestiasp.,RetimarginiferaperarataWaterhouse,CallytharrellaKhaliiArchbold,LinoproductusCora（Orbigny）Globiellafoodi（Etheridge）,G．flexousa（Waterhouse）,Cancrinellasp.,Attenuatellasp.,Trigonotretacf.StokesiKoenig,ElivinabisnainiArchbold＆Thomas,Spiriferellasp.,LatedCallytharreasisArchbold＆Thomas,？Sulci－plicaCrassaClarke,SpireythafredericksiArchbold＆Thomas等与澳大利亚,特别是澳大利亚西部早二叠世的相当属种很相似。它们之间有着密切的亲缘关系。澳大利亚早二叠世上述腕足动物可能来源于华夏特提斯区。并据澳大利亚早二叠世上述腕足动物最新研究成果,对我国沿用过去的上述腕足动物名称术语作了订正。据资料,认为贵州扁平早二叠世上述腕足动物特征与伊朗加亚、巴基斯坦盐岭、阿富汗、中国 相似文献
11.
依据保山地区岩关晚期地层至大塘早期地层连续发育,化石丰富及动物群既具酉欧区系分子,又具北美区系分子等特征,提出这一地区是我国岩关阶至大塘阶界线层型理想地区,易于与西欧和北美地层对比。 相似文献
12.
西藏申扎和改则地区早石炭世地层及腕足类研究 总被引：1，自引：0，他引：1
西藏申扎和改则地区早石炭世地层发育,腕足类及珊瑚类化石丰富。腕足类化石计有34属45种,共建立3个组合;申扎大塘阶下部巴日阿郎寨组Ovatia-Unispirifer组合;大塘阶上部永珠组Balakhonia-Productus组合;改则大塘阶上部Latiproductus-Striatifera组合。本文系统讨论了各腕足类组合的时代及与国内外同期地层的对比,将西藏境内早石炭世的沉积物及生物群划分为3个类型。根据生物群及沉积物在空间上的分布特点,笔者认为在早石炭世时,班公湖至怒江断裂南北生物群及沉积物具有明显的差异,即南部申扎和珠峰地区生物群及沉积物特征与冈瓦纳大陆相似,而北部改则地区与扬子地台的生物群及沉积物特征相同,其间可能有宽阔的海域隔离。 相似文献
13.
湘中下石炭统痕迹化石及其环境分布 总被引：2，自引：0，他引：2
湘中下石炭统中发育有非常丰富的痕迹化石，本文报道了在其中鉴别出的１７种痕迹化石，并对其组合特征及环境分布进行分析，划分出Ｆｕｃｏｓｏｐｓｉｓ组合、Ｓｋｏｌｉｔｈｏｓ组合、ｐａｌａｅｏｐｈｙｃｏｓ组合、Ｒｈｉｚｏｃｏｒａｌｌｉｕｍ组合、Ｃｈｏｎｄｒｉｔｅｓ组合等。它们分别与潮坪－湖、障壁砂坝、滨外碎屑陆棚、滨外浅水碳酸盐陆棚及深水碳酸盐陆棚等环境相对应。文中还对区内几种常见的痕迹化石如Ｔｈａｌａｓｓｉｎｏｉｄｅｓ、Ｐｌａｎｏｌｉｔｅｓ、Ｚｏｏｐｈｙｃｏｓ及Ｃｈｏｎｄｒｉｔｅｓ等的环境意义做进一步探讨。 相似文献
14.
A.V. Prokopiev V.B. Ershova E.L. Miller A.K. Khudoley 《Russian Geology and Geophysics》2013,54(10):1195-1204
The first U–Pb dating of detrital zircons from the Lower Carboniferous sandstones in the frontal part of the northern Verkhoyansk fold-and-thrust belt showed that detrital zircon age spectra for the Lower Visean (Krestyakh Formation) and the Upper Visean–Serpukhovian (Tiksi Formation) rocks are quite different. The Early Visean sandstones contain up to 95% detrital zircons of Precambrian age, while those of Late Visean–Serpukhovian age, only 55%. The shape of age distribution plots of Precambrian zircons for both samples is similar, indicating that reworking of terrigenous sediments of the Krestyakh Formation or the same sources dominated in Early Visean time (crystalline basement of the craton, eroded Meso- and Neoproterozoic sedimentary complexes, and igneous rocks of Central Taimyr) contributed significantly to the accumulation of the Late Visean–Serpukhovian deposits. In the rocks of the Tiksi Formation, 45% of detrital zircons are of Paleozoic age, while 24% are Early Paleozoic, with prevailing Cambrian and Ordovician ages. Possible provenance areas with abundant igneous rocks of this age could be the Taimyr–Severnaya Zemlya and Central Asian fold belts extending along the northern, western or southwestern margins of the Siberia. The presence of Middle–Late Devonian zircons is thought to be related to the erosion of granitoids of the Yenisei Ridge and the Altai–Sayan region. Early Carboniferous detrital zircons probably had a provenance in igneous rocks of the Taimyr–Severnaya Zemlya fold belt, on the assumption that collision between the Kara block and the northern margin of the Siberian continent had already occurred by that time. In Early Visean time, sedimentation occurred in small deltaic fans, likely along steep fault scarps that formed as a result of Middle Paleozoic (Devonian–Carboniferous) rifting. The clastic material came from small rivers that eroded the nearby area. Late Visean–Serpukhovian time was marked by a sharp increase in the amount of clastic material and by the appearance of detrital zircons coming from new provenance regions, such as fold belts extending along the northern and southwestern margins of the Siberian continent. A large river system, which was able to transport clastic material over large distances to deposit it in submarine fans on the northern Verkhoyansk passive continental margin, had already existed by that time. 相似文献
15.
海南岛南好组剖析 总被引：9，自引：2，他引：7
南好组是海南岛目前使用最广泛的地层单位之一 ,代表该岛整个下石炭统 ,但其选层型为下志留统而非岩关阶 ,保亭南好地区并不存在下石炭统 ;其副层型原本是青天峡组的层型。据此 ,南好组应予废弃。根据新近发现的吉维特期胞石 Eisenackitina castor、Grahanichitina pilosa、L agenochitina amottensis;法门期牙形刺 Palmatolepisgracilis gracilis、P.gracilis sigmoidalis、Polygnathus germanus;以石燕贝类为主的岩关期腕足动物群 Spirifercf.subgrandis、Fusella cf.fornacensis、Palaeochoristites sp.、Chonetipustula sp.、Marginatia sp.、Rhipidomellaspp.和牙形刺 Siphonodella isosticha- S.cooperi组合 ;以及滑石板期—达拉期牙形刺 Mesogondolella clarki组合 ,岛西北部地区的南好组废弃后可划分出 :中泥盆统吉维特阶 (?) (组名待建 )、上泥盆统法门阶昌江组、下石炭统岩关阶鸡实组 (新名 )、大塘阶青天峡组下段及三棱山组等不同地层单元 相似文献
16.
Carboniferous deep‐water marine strata have been insufficiently studied in western Junggar, NW China where the deep‐water facies successions have long been disputed in terms of age constraints, sequence and palaeoenvironmental reconstruction. This paper introduces some views in the light of new materials obtained from this region in recent years. The presence of the Visean plant fossils from the upper Ta'erbahatai Formation in the Tarbgatay Mountains indicates that the formation can be extended to the Early Carboniferous epoch in age. This unit also displays obvious diachroneity, which is of Late Devonian to Early Tournaisian age in the Saur Mountains and Late Devonian to Visean age in the Tarbgatay Mountains. The Xibeikulasi, Baogutu and Tailegula formations are widely distributed in northwestern Karamay areas. The scouring structures and graded bedding near the boundaries between the three formations confirm the stratal sequence that they were originally assigned, namely the Xibeikulasi, Baogutu and Tailegula formations in ascending order. The ‘fossil chaos’ of the three formations is due to mistaking fossils of other stratigraphic units for fossils of these three formations. After revision, only the Early Carboniferous fossils are considered reliable, and combined with the newly found plant fossils, the Xibeikulasi, Baogutu and Tailegula formations are re‐assigned to the early Visean, late Visean, and latest Visean to Serpukhovian ages, respectively. An extension of the lower Hala'alate Formation was recognized in the southwestern Hala'alate Mountains. The presence of the latest Early Carboniferous brachiopods constrains the Hala'alate Formation as late Serpukhovian to Bashkirian in age, bearing the mid‐Carboniferous boundary. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
17.
The early Carboniferous series of the Adarouch area (northeast central Morocco) are subdivided into three sedimentological and biostratigraphical units. The first unit, which belongs to the Late Visean zones V3bβ and V3bγ, was deposited on shallow carbonate platforms. The second unit belongs to the Late Visean zone, V3c, and incudes terrigenous deposits, such as turbidites, shales and olistostromes. The third unit belongs to the Serpukhovian stage and consists of sandstones and limestones. A new biostratigraphical analysis, which is based on foraminiferal, algae and pseudoalgae, allows an accurate dating of the units. The deposits of the zones V3bβ and V3bγ contain characteristic calcareous microfossils, such as Stacheoides sp., Pseudoendothyra sp. and Ungdarella uralica. The V3c zone (300–400 m) is shown in two oolitic beds of the Mouarhaz and Akerchi Formations, respectively, with Janischewskina sp. and Asteroarchaediscus sp. The Serpukhovian stage is characterised by the disappearance of the algae Koninckopora and the appearance of the brachiopod Titanaria. The new data from the Adarouch area confirm the Moroccan biostratigraphical scale of the Moroccan meseta. 相似文献
18.
新疆乌鲁木齐祁家沟晚石炭世四射珊瑚 总被引：1，自引：0，他引：1
本文共描述12属、24种和亚种,其中1新属,19新种和新亚种。隶属于晚石炭世早期祁家沟组的四射珊瑚9属、16种和亚种及Amplexus qijiagouensis-Cystilophophyllum minor组合。隶属于晚石炭世晚期奥尔吐组的四射珊瑚5属9种。 相似文献
19.
吉林中部志留─泥盆纪生物地层、群落生态及生物古地理 总被引：7，自引：1，他引：7
吉林省中部的二道沟组、小绥河组、张家屯组的时代归属，一直是国内、外地质学家争议的问题之一。根据无脊椎动物化石鉴定结果，张家屯组的时代为志留纪Ｌｕｄｌｏｗ晚期至Ｐｒｉｄｏｌｉ早期，小绥河组为志留纪末Ｐｒｉｄｏｌｉ期或泥盆纪初Ｌｏｃｈｋｏｖ期，二道沟组为早泥盆世Ｌｏｃｈｋｏｖ早期。根据上述地层中珊瑚和腕足动物化石，推测它们当时是生活在正常浅海的生活环境中，大致相当于底栖组合ＢＡ３。我国东北地区中古生代存在着两个不同的动物地理区：华北地台北缘产Ｒｅｔｚｉｅｌｌａ腕足动物群和Ｃａｒｌｉｎａｓｔｒａｅａ珊瑚动物群，吉林中部就位于这一个动物地理区范围之内；西伯利亚地台南缘产Ｔｕｖａｅｌｌａ腕足动物群。 相似文献
20.
在山东惠民凹陷渐新统东营组二段发现了浪花介超科尾花介科Recticytherura ualisicosta gen.et sp.nov.－－U形脊直尾花介（新属、新种），化石产于该段近底部含生物砂质灰岩中。这是本区乃至渤海湾盆地下第三系尾花介科化石的首次发现。对该新属、新种进行了描述并据铰合构造、尾突、放射毛细管及壳壁构造等特征判断其为海相介形类。与之共生的介形类的组合特征、壳壁的元素组成特征及围岩的碳、氧同位素特征反映了微咸－半咸水的沉积环境，并由古湖泊的扩张和古气候分析认为东营组二段沉积期在惠民凹陷发生了一次短暂海泛。 相似文献