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1.
福建西部中石炭世地层以往被认为有两套不同岩性组合,一套以碳酸盐沉积为特征的灰岩、白云岩等,另一套以碎屑沉积为主的砂、泥、硅质岩。前者称黄龙组(C_2h),后者称经畬组(C_2j),二者为同期异相产物。还认为中石炭世的(竹蜓)类化石自下而上仅有:Profusulinella和Beedeina-Fusulina两个组合带,其下缺失Pseudostaffella带。最近,在1:50000区域地质调查中,我们在宁化泉上、湖村、石洞峡,清流嵩溪等地系统地测制了林地组(C_1l)之上、黄龙组之下的一套以硅质岩为主、 相似文献
2.
在黔北地区铝土矿层之下的黄龙组灰岩中采获了大量时代意义很强的(蜓)类及非(蜓)有孔虫化石.经鉴定,这些化石包括(蜓)类5属13种,另有3个未定种,非(蜓)有孔虫8属17种,另有9个未定种.在此基础上建立了两个(蜓)带,自下而上为Pseudostaffella antiqua带和Profusulinella带,由此确定铝土矿层之下黄龙组时代为晚石炭世滑石板期至达拉期早期.此外,通过对区域上石炭纪至二叠纪层序地层及海平面变化的分析研究,确定研究区石炭纪末至中二叠世栖霞期早期为当时区域上海平面下降幅度最大的时期,继而判断铝土矿的形成时代应为石炭纪末至中二叠世栖霞期早期. 相似文献
3.
柴达木盆地北缘晚石炭世地层 总被引：2，自引：0，他引：2
本文对柴达木盆地北缘晚石炭世地层进行了划分、对比,分2个组,下部为克鲁克组,上部称扎布萨朵秀组。克鲁克组自下而上分为4个段。第2段建立(竹蜓)类Eostaffella su-bsolana-Pseudowedekindellina prolixa组合带;腕足类1—2段为Productus concinus-Choristitesyanghukouensis组合带;3段(竹蜓)类为Profusulinella-Pseudostaffella qinghaiensis组合带,4段(竹蜓)类为Fusulina- 相似文献
4.
太原西山上石炭统太原组的(竹蜓)类分带 总被引：9，自引：3，他引：9
<正> 太原西山是华北晚石炭世海陆交替相含煤沉积之一——太原组的层型剖面建立地区。李四光教授(1927—1931)曾于《中国北部之(竹蜓)科》等专著中,记述产于区内太原组中的若干(竹蜓)类,为华北区石炭纪的(竹蜓)类研究及地层的划分对比,奠定了重要基础。盛金章、李星学(1965)亦曾记载过太原西山太原组的部份(竹蜓)类名单。但区内太原组的(竹蜓)类尚缺乏系统的研究。近年来,山西区调队在太原西山的玉门沟—北岔沟—前火山一带,重新测 相似文献
5.
一、序言(代研究简史) 有关福建栖霞组层位的研究工作,可追溯到1930年王绍文创立的“曹远石灰岩”及1935年侯德封等使用的“栖霞灰岩”其均指福建现今划为林地组与文笔山组之间的一套灰岩地层。当时不知其中尚包含有中、上石炭统的黄龙组和船山组层位。至1941年陈旭等在清流沙芜塘采获晚石炭世(竹蜓)类后方告分晓并予划出。到此福建“栖霞灰岩”才名符其实地 相似文献
6.
在对福建上杭上石炭统[竹蜓]类系统研究的基础上,根据[竹蜓]类化石在地层中的分布和垂向变化规律,自下而上建立了2个[竹蜓]带：Profusulinella带和Fusulina-Fusulinella带。Profusulinella带细分为2个亚带：Profusulinellastaffellaeformis亚带和Profusulinella wangyui-Eofusulinatriangula亚带;Fusulina-Fusulinella带细分为3个亚带：Fusulinella helence-Pseudostaffellapaxadxa亚带,Beedeina meyiensis亚带及Fusulinaquasicylindrica亚带。通过与我国华南沉积区和欧美同期[竹蜓]类生物地层的对比,解决了本区上石炭统地层的时代归属,为福建以及我国石炭系的划分和对比提供重要的基础资料。 相似文献
7.
江苏南部黄龙组底部白云岩的归属问题 总被引：4，自引：0，他引：4
<正> 江苏南部中石炭统黄龙组底部有两套白云岩,一为宁镇地区黄龙组与和州组之间的白云岩,二为宜兴、溧阳地区黄龙组与高骊山组之间的白云岩。不少人都将这两套白云岩归于黄龙组底部,时代均为中石炭世早期。自夏邦栋(1959)提出“老虎洞白云岩”以来,陈敏娟和黄建辉、南京地质矿产所、江苏区测队等对这两套白云岩都进行了研究,并提出各自的看法。陈敏娟、黄建辉(1962)将宁镇地区的白云岩称老虎洞组,时代为早石炭世韦宪晚期。最近他们再次论证了老虎洞组的时代,并认为宜兴、溧阳地区的白云岩的时代应晚于老虎洞组白云岩的时代。陈华成等(1979)将宁镇地区的白云岩作为和州组(广义)的上 相似文献
8.
<正> 江西九瑞地区的大地构造位于下扬子台褶带,南与江南地背斜雪峰期褶皱带、北与武当大别雪峰期褶皱带毗邻。九瑞地区加里东运动长期以来系指上志留统西坑组与上泥盆统五通组间的假整合关系。普遍缺失早、中泥盆世的沉积,到晚泥盆世才开始下降,沉积了五通组。岳文浙等(1987)应用沉积相的研究方法,认为本区五通组实际上应划入黄龙组,作为黄龙组的一个岩性段,时代为晚石炭世威宁期。因此,九瑞地区加里东运动的时 相似文献
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10.
一、引岩吉林省延边地区属于华力西晚期地槽褶皱区,晚古生代地层发育,经杨启伦、李西昆等于1962～1963年在区域地质调查中进行了较为详细的划分,建立了晚石炭世山秀岭组。标准剖面位于延吉县开山屯镇西南十公里的山秀岭。1980年李莉、谷峰在古生物学报上描述了该剖面的腕足类化石13属20种,同年,韩建修在东北地区古生物图册中研究和描述了(竹蜓)类化石6属9种,但对(竹蜓)类化石的分带尚未涉及。笔者根据对该剖面(竹蜓)的研 相似文献
11.
近年来，在江西中西部黄龙组底部发现了Ｐｓｅｕｄｏｓｔａｆｆｅｌｌａ，由此涉及到了黄龙组底部的地层时代及对比问题。根据匕高石坎尾剖面上类化石的分布和动物群性质，江西黄龙组底部与Ｅｏｓｔａｆｆｅｌｌａ、Ｓｃｈｕｂｅｒｔｅｌｌａ共生的Ｐｓｅｕｄｏｓｔａｆｆｅｌｌａ和贵州、湖南Ｐｓｅｕｄｏｓｔａｆｆｅｌｌａ带组合面貌相差甚远。江西中西部至今不存在确切的Ｐｓｅｕｄｏｓｔａｆｆｅｌｌａ带。 相似文献
12.
河北完县中、晚寒武世牙形石和三叶虫生物地层 总被引：5，自引：1，他引：5
<正> 华北寒武系三叶虫生物地层学的研究历史悠久,目前已趋完善。但凤山期前的牙形石研究是牙形石学研究中的薄弱环节。国外学者对长山阶及以下地层中的牙形石研究甚少,仅Mller(1956)对波罗的海沿岸地区和美国以及Mller et Hintz(1991)对瑞典中南部的寒武系牙形石的研究成果。Miller(1980,1984)在美国西部相当于凤山阶的地层中建立了详细的牙形石带,迄今为止,尚无人在长山阶及之下的地层中建立牙形石带。在国内,安太庠(1982)研究了山东莱芜、河北涞水、辽宁复县和本溪等地的牙形石,并综合 相似文献
13.
<正> 广西隆林县隆或的马平组灰岩,与下伏黄龙组为整合接触,与上覆栖霞组由于第四纪坡积覆盖关系不清,厚215m。宜山马平组厚364m(赵金科,1947),德胜马平组厚481m(盛金章、侯祐堂等,1959),隆或马平组的厚度较小,但(竹蜓)类在地层上的垂直演化阶段仍是完整的,规律清楚。自下而上可分为四个(竹蜓)类化石带。 1.Montiparus带,2.Triticites带,3.Pseudoschwagerina带,4.Pseudofusulina带。各带特征详述如下: 1.Montiparus带 为最低的(竹蜓)类化石带,厚22m。以产旋壁蜂巢层发育较差的(竹蜓) 相似文献
14.
雪峰古陆边缘石岩统为一套滨浅海碳酸盐岩和碎屑岩沉积。下部黄龙组为白云岩，灰岩和砾岩及少量硝岩互层，上部船山组为灰岩，白云质与砂岩及少量砂岩互层，船山组含Ｔｒｉｔｉｃｉｅｓ带和Ｐｓｅｎｄｏｓｃｈｗａｇｅｎｉｎａ带。整个上石炭统碎屑岩和碳酸盐岩交替出现，属海水浅的滨海陆脊滩相至局限台地相。 相似文献
15.
S.J. Gallagher C.V. MacDermot I.D. Somerville M. Pracht A.G. Sleeman 《Geological Journal》2006,41(1):61-91
The Burren region in western Ireland contains an almost continuous record of Viséan (Middle Mississippian) carbonate deposition extending from Chadian to Brigantian times, represented by three formations: the Chadian to Holkerian Tubber Formation, the Asbian Burren Formation and the Brigantian Slievenaglasha Formation. The upper Viséan (Holkerian–Brigantian) platform carbonate succession of the Burren can be subdivided into six distinct depositional units outlined below. (1) An Holkerian to lower Asbian unit of skeletal peloidal and bryozoan bedded limestone. (2) Lower Asbian unit of massive light grey Koninckopora‐rich limestone, representing a shallower marine facies. (3) Upper Asbian terraced limestone unit with minor shallowing‐upward cycles of poorly bedded Kamaenella‐rich limestone with shell bands and palaeokarst features. This unit is very similar to other cyclic sequences of late Asbian age in southern Ireland and western Europe, suggesting a glacio‐eustatic origin for this fourth‐order cyclicity. (4) Lower Brigantian unit with cyclic alternations of crinoidal/bryozoan limestone and peloidal limestone with coral thickets. These cycles lack evidence of subaerial exposure. (5) Lower Brigantian bedded cherty dark grey limestone unit, deposited during the maximum transgressive phase of the Brigantian. (6) Lower to upper Brigantian unit mostly comprising cyclic bryozoan/crinoidal cherty limestone. In most areas this youngest unit is truncated and unconformably overlain by Serpukhovian siliciclastic rocks. Deepening enhanced by platform‐wide subsidence strongly influenced later Brigantian cycle development in Ireland, but localized rapid shallowing led to emergence at the end of the Brigantian. A Cf5 Zone (Holkerian) assemblage of microfossils is recorded from the Tubber Formation at Black Head, but in the Ballard Bridge section the top of the formation has Cf6 Zone (Asbian) foraminiferans. A typical upper Asbian Rugose Coral Assemblage G near the top of the Burren Formation is replaced by a lower Brigantian Rugose Coral Assemblage H in the Slievenaglasha Formation. A similar change in the foraminiferans and calcareous algae at this Asbian–Brigantian formation boundary is recognized by the presence of upper Asbian Cf6γ Subzone taxa in the Burren Formation including Cribrostomum lecomptei, Koskinobigenerina sp., Bradyina rotula and Howchinia bradyana, and in the Slievenaglasha Formation abundant Asteroarchaediscus spp., Neoarchaediscus spp. and Fasciella crustosa of the Brigantian Cf6δ Subzone. The uppermost beds of the Slievenaglasha Formation contain a rare and unusual foraminiferal assemblage containing evolved archaediscids close to tenuis stage indicating a late Brigantian age. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
16.
Sediments of Early Aptian age in Bulgaria can be assigned to four different facies: platform carbonates (Urgonian complex), shallow-water siliciclastics, hemipelagic and flyschoid siliciclastics. The taxonomic analysis of the ammonite faunas of 18 sections from these four different facies resulted in a revision of the existing ammonite zonation scheme so far applied in Bulgaria and adjoining areas. A new biostratigraphic scheme, which bridges the western and eastern Tethys, is thereby proposed for the Lower Aptian of Bulgaria.The Upper Barremian Martelites sarasini Zone is characterized in its upper part by the Pseudocrioceras waagenoides Subzone in the shallow-water sections and by a horizon with Turkmeniceras turkmenicum in the deep-water settings. The Upper Barremian/Lower Aptian boundary is fixed by the first appearance of Paradeshayesites oglanlensis. For the Lower Aptian the following ammonite zones were established (from bottom to top): The Paradeshayesites oglanlensis Zone, the Deshayesites forbesi Zone (= formerly Paradeshayesites weissi Zone) including the Roloboceras hambrovi Subzone in the upper part, the Deshayesites deshayesi Zone including the Paradeshayesites grandis Subzone in the upper part and the Dufrenoyia furcata Zone. The Lower–Middle Aptian boundary has been defined by the appearance of species belonging to the genera Epicheloniceras and Colombiceras.The Lower Aptian ammonite faunas of Bulgaria, allow an interregional correlation with other areas of the Tethyan Realm. The presence of Turkmeniceras in the Upper Barremian enables a correlation with the Transcaspian region, whereas Roloboceras, Koeneniceras and Volgoceratoides found in the middle part of the Lower Aptian are more typical representatives of the ammonite faunas in northern Europe (England, Germany, Volga region).The analysis of the ammonite successions in combination with sedimentological observations enable us to conclude that the marls and marly limestones of the Lower Aptian studied here also cover the interval of the Oceanic Anoxic Event 1a. An interval of thin-laminated clays, rich in organic matter, was identified in the upper part of the D. forbesi Zone (Roloboceras hambrovi Subzone). This interval is characterized by a total lack of benthic faunas. 相似文献
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18.
华南泥盆系－石炭系界线附近的珊瑚、有孔虫和牙形类及其地层意义 总被引：1，自引：1，他引：0
华南地区岩关阶依皱纹珊瑚可分为Ｃｅｒｉｐｈｙｌｌｕｍ－Ｃａｎｉｎｏｐｈｙｌｌｕｍｐａｔｕｌｕｍ（Ｇ－Ｃ）组合带、Ｃｙｓｔｏｐｈｙｒｅｎｔｉｓ（Ｃ）延限带和Ｐｓｅｕｄｏｕｒａｌｉｎｉａ（Ｐ）延限带及相应的有孔虫带和牙形类带（表１）。与法国一比利时盆地、英国和俄罗斯奥莫朗地区有关生物地层相比,Ｃ－Ｃ组合带与法一比盆地的ＲＣ１间隔带下部和英国的Ｋｍ－Ｋ１亚带大致相当;Ｃ延限带与ＲＣ１间隔带上部至ＲＣ２间隔带下部和英国的Ｋ２－Ｚ１亚带对比;Ｐ延限带与ＲＣ２间隔带上部至ＲＣ３奥佩尔带和英国的Ｚ方亚带至γ层对比。若以Ｐ延限带或所谓的＂Ｃ－Ｐ间隔带＂做为中国石炭系与泥盆系的分界标志,则石炭系的底界过于偏高。笔者认为Ｃ－Ｃ组合带或邵东组属于早石炭世地层。 相似文献
19.
The genus Euthymiceras is considered as the junior synonym of the genus Neocosmoceras. Four species N. euthymi, N. cf. transfigurabilis, N. minutus sp. nov., and N. giganteus sp. nov. from the Berriasian deposits of the Crimean Mountains are described for the first time. The biostratigraphic unit formerly termed the “Euthymiceras-Neocosmoceras Beds” is ranked now as the Neocosmoceras euthymi Subzone with a synonymous index species. The subzone is correlated to the following biostratigraphic units: the synonymous subzone of the northern Caucasus, the Neocosmoceras-Septaliphoria semenovi (upper part) and Buchia volgensis local zones of Mangyshlak, the upper part of the Riasanites rjasanensis Zone in the East European platform, and the paramimounum Subzone of the boissieri Zone in the standard zonation of the Tethyan ammonites. 相似文献
20.
The Middle Oxfordian to lowermost Upper Kimmeridgian ammonite faunas from northern Central Siberia (Nordvik, Chernokhrebetnaya, and Levaya Boyarka sections) are discussed, giving the basis for distinguishing the ammonite zones based on cardioceratid ammonites of the genus Amoeboceras (Boreal zonation), and, within the Kimmeridgian Stage, faunas–for distinguishing zones based on the aulacostephanid ammonites (Subboreal zonation). The succession of Boreal ammonites is essentially the same as in other areas of the Arctic and NW Europe, but the Subboreal ammonites differ somewhat from those known from NW Europe and Greenland. The Siberian aulacostephanid zones—the Involuta Zone and the Evoluta Zone—are correlated with the Baylei Zone (without its lowermost portion), and the Cymodoce Zone/lowermost part of the Mutabilis Zone (the Askepta Subzone) from NW Europe. The uniform character of the Boreal ammonite faunas in the Arctic makes possible a discussion on their phylogeny during the Late Oxfordian and Kimmeridgian: the succession of particular groups of Amoeboceras species referred to successive subgenera is revealed by the occurrence of well differentiated assemblages of typical normal-sized macro and microconchs, intermittently marked by the occurrence of assemblages of paedomorphic “small-sized microconchs” appearing at some levels preceeding marked evolutionary modifications. Some comments on the paleontology of separate groups of ammonites are also given. These include a discussion on the occurrence of Middle Oxfordian ammonites of the genus Cardioceras in the Nordvik section in relation to the critical review of the paper of Rogov and Wierzbowski (2009) by Nikitenko et al. (2011). The discussion shows that the oldest deposits in the section belong to the Middle Oxfordian, which results in the necessity for some changes in the foraminiferal zonal scheme of Nikitenko et al. (2011). The ammonites of the Pictonia involuta group are distinguished as the new subgenus Mesezhnikovia Wierzbowski and Rogov. 相似文献