西藏晚白垩世晚Campanian期至早Maastrichtian期菊石群——中国最年轻的菊石群

记述产自西藏南部仲巴县的一个中国目前所知最年轻的菊石群 ,含 2科 4属 6种 ,其中 4新种。据菊石群面貌和它们所产出的层位可以划分出上、下两个组合带 :上部Pachydiscuscf.hidakaensis Libycoceraszhongbaense组合带 ;下部Manambolitescujiangdingensis M .pivaeteaui组合带。产菊石的曲贝亚组的下段和上段的中、下部(82F5 0及其以下层位 )为晚Campanian期 ,上段上部 (即 82F5 2及其以上层位 )为早Maastrichtian期。

奥地利Gosau群Bibereck组Campanian早期海水变深序列的地层学和地球化学(英文)

Schmidsippl剖面位于奥地利北钙质阿尔卑斯构造带内Gosau群典型地区。剖面出露的Bibereck组记录了一个海侵和沉积区海水变深过程。Bibereck组之下是Santonian晚期Hoclamoos组(Santlkalkbank段)，主要为砂质、粉砂质灰色生物扰动构造发育的泥灰岩，含少量双壳类碎片。Hochmoos组之上为灰色泥灰岩和泥灰质灰岩。Bibereck组下部显示变深到近滨-远滨过渡带区域；向上，泥灰岩指示细粒泥质远滨沉积，水深大致50～150m；之上出现浮游有孔虫含量超过90％的泥灰质灰岩，代表着半深海沉积环境。生物地层数据显示采样层位整体位于浮游有孔虫asymetrica-elevata带，由Globotruncanita elevata和Dicarinella asymetrica的共同出现来界定。钙质超微化石Calculites obscurus、Lucianorhabdus cayeuxii、Arkhangelskiella cymbi formis的出现指示属于钙质超微化石带CC17b／UC12，相当于Campanian初期。地层深度剖面上，Ca／Al比值和Catot含量显示海水来源的Ca在0～5m地层内几近于零，向上快速增加；(Fe／Al)／碳酸盐显示两个峰值，代表更还原条件，分别位于4m和10m位置；K／Al比值的下降被解释为更潮湿气候条件；剖面上部Ba含量的增加显示向更低原始生产条件的变化；陆源矿物在剖面7m以下保持稳定，之上一直到剖面顶部不断下降。生物地层数据表明在约50万年短暂的时间间隔内水深由几米深浅水环境变深为800～1500m深半深海环境。地球化学数据显示在海侵过程中出现两个海平面变化波动过程。这些数据为与上覆大洋红层进行对比提供了基础。

Albian－Campanian钙质超微化石描述生物地理学研究

本文以Ａｌｂｉａｎ－Ｃａｍｐａｎｉａｎ的钙质超微化石为例，介绍了一种描述生物地理学研究的新方法──运用计算机绘制化石种的分布图（包括平面图和立体图两种），并运用这一方法对该时间段的近２００个种进行了具体研究，归纳出六种分布类型，即：广布型，南半球分布型，北半球分布型，赤道海域缺失型，赤道海域分布型，迁移型。并且对每个种在这一时间段中的分布作了具体阐述。

Campanian Climatic Change:Isotopic Evidence from Far East,North America,North Atlantic and Western Europe

Paleoclimatic settings have been reconstructed for the Campanian using original oxygenisotopic analyses of well-preserved molluskan and foraminifera shells from Russian Far East, Hokkaido, USA, Belgium and some DSDP holes （95, 98, 102, 390A, and 392A） in North Atlantic. Early Early Campanian climatic optimum has been recognized from data on high bottom shelf water paleotemperatures in middle latitudes of both the western circum-Pacific （to 24.2℃） and the eastern circum-Pacific （to 26.4℃） areas and high bottom shallow water paleotemperatures in high latitudes of the Koryak Upland （22.4-25.5℃）, which agrees with the data on the Campanian Barykovskaya flora in high latitudes （Golovneva and Herman, 1998） and Jonker flora and its equivalents in middle latitudes. Judging from the data on comparatively high bottom shallow water paleotemperature values in high latitudes, South Alaska （19.4℃） and the Koryak Upland （22.4-25.5℃）, we also expect Latest Campauian temperature maximum, which has not been confirmed, however, for low and middle latitudes by neither of isotopic nor paleobotanic data now. Main dimatic tendency during the Campanian （with the exception of Latest Campanian） has been learned from isotopic composition of Campanian aragonitic ammonoid shells from the Hokkaido-South Sakhalin （Krilyon） marine basin. In contrary to Huber＇s et al. （2002） assumption, we expect warm greenhouse conditions during the most part of the Campanian.

Pb Isotopes Data from the Campanian Volcanic Province: A Model to Generate These Distinctive Pb Isotopic Variations

A broad set of samples from the CVP has been analyzing Pb isotopes. Campanian Volcanic Province (CVP) has been produced by various ranges of mixing between three components: 1) MORB, 2) Hercynian basement and 3) upper crust. Anyhow, the upper crust that has modified the Pb isotopic composition also shows trends towards an Achaean upper crust. This is consistent for all Mediterranean area. This is not in contrast with the past plate tectonic reconstruction. Also the surface sediments (GLOSS) may have been a mixing between the Achaean upper crust and a Hercynian component with an implication worldwide due to the rock cycle processes.

Timing of Onset of Volcanic Centers in the Campanian of Western North America as Determined by Distal Ashfalls

Strata of the Late Cretaceous Niobrara Formation and Pierre Shale Group include bentonites that provide a distal record of volcanic activity taking place to the west. Detailed stratigraphic analysis combined with mineralogy and geochemistry of the bentonites indicates the following timing of events: 1) Eustatic sea level fall as a result of the end of the Niobrara Cycle;2) Tectonic deformation of the Western Interior Seaway coincident with tectonism on the Absoroka Thrust in Wyoming and Late Canyon Range Thrust in Utah;3) Backarc volcanism in Montana associated with the Little Elkhorn Mountain volcanic complex;4) Forearc volcanism in the Cascades area indicates subduction of a hot oceanic crust where plagioclase in the oceanic crust is being incorporated into the melt;5) Cessation of tectonic activity results in a return of sedimentation patterns to north-south trending belts with the Boyer Bay and Burning Brule members of the Sharon Springs Formation deposited to the east and the Mitten Black Shale Formation deposited in the basin.

Dolomitization in Campanian Oil Shale Rocks from South-Western Jordan

This work represents the first detailed study of an oil shale (OS) section from the Upper Campanian Amman Silicified Limestone (ASL) Formation in south-western part of Jordan. More than five meters of oil shale have been recorded. Using the petrography and geochemistry, this study aims to focus on such non-conventional types of oil shale rocks in Jordan and to shed some light on their composition and formational environment. Unlike oil shale from Maastrichtian to early Tertiary, this type of oil shale is highly dolomitized. The dolomite is diagenetic in origin. This oil shale type contains considerable amount of OM and remarkably enriched in some trace elements and shows quite low sulfur content. Results suggest that the formation of dolomite appears to be limited by the rate of organic matter oxidation.

The first occurrence of Scincomorpha lizard from Nenjiang Formation(lower Campanian)of Jilin,Northeast China

Fossil lizards are scarce in Jinlin Province,with only two jaws of Middle Eocene Acrodonta.Here the authors report the first scincomorph lizard materials from the early Campanian Nenjiang Formation in Nong’an,Changchun,Jilin Province.Three tooth morphologies of scincomorph lizards represented by fragmentary dentaries are tentatively identified as Scincomorpha.The morphology of the crowns indicates probably the insectivorous and omnivorous diets of these small lizards.It is the first lizard fossils discovered in the Late Cretaceous of Northeast China,extends the known paleogeographic distribution of scincomorph lizards,and provides new information about the terrestrial vertebrate fauna of the Cretaceous Songliao Basin.

大杨树盆地嫩江组孢粉化石及其地质意义

大杨树盆地是松辽盆地外围重要的具有油气勘探潜力的中生代盆地。研究大杨树盆地嫩江组露头样品孢粉化石,建立雪松粉Cedripites—罗汉松粉Podocarpidites—雏囊粉Parcisporites组合。结果表明:大杨树盆地嫩江组建立的孢粉化石组合以三缝类孢子和双气囊类花粉为主,Schizaeoisporites属、Cyathidites属和被子植物花粉的质量分数较低,Classopollis属未见,组合特征与以往建立在松辽盆地的嫩江组孢粉组合明显不同。Lytharites、Pentapollenites、Callistopollenites、Consoliduspollenites、Retitricolpites和Borealipollis等具有时代意义的被子植物花粉化石的出现,明确大杨树盆地嫩江组的沉积时代为晚白垩世Campanian期。大杨树盆地嫩江组沉积时期古植被以松柏类、真蕨类和石松类为主,古气候环境属于湿润的亚热带。该结果对大杨树盆地地层及古气候研究具有指导意义,为盆地油气勘探提供基础地质支撑。

松科1井南孔白垩系姚家组沉积序列精细描述：岩石地层、沉积相与旋回地层

中国白垩纪大陆科学钻探松科1井南孔连续取姚家组岩心长157.67m,岩心收获率为99.96%。上白垩统姚家组对应着三冬阶和坎潘阶下部。松科1井南孔姚家组岩心的精细描述,揭示其岩性-岩相-旋回的沉积序列及其过程。姚家组中可识别基本岩石类型11种,相类型为浅湖、半深湖和三角洲前缘3种亚相,白云岩沉积、泥质灰岩沉积、浅湖和深湖浊流沉积、河口坝、远砂坝、席状砂、分流间湾、水下滑塌沉积、浅湖和深湖静水泥沉积11种沉积微相。姚家组可识别的米级旋回(六级旋回)有8种类型,可划分出151个米级旋回。这些米级旋回叠加成45个五级旋回、9个四级旋回和3个三级旋回。完整组段厘米级刻画为高精度沉积过程研究提供了可能。姚家组红层厚度占姚家组总厚度的43%,作为该时期已被揭示的全球为数不多的陆相红层之一,厘米级刻画的姚家组大套陆相红层为全球白垩纪富氧事件研究提供了可能的立典剖面。

松辽盆地松科1井上白垩统嫩江组三～五段沉积序列厘米级精细刻画:岩性·岩相·旋回

中国白垩纪大陆科学钻探松科1井连续取嫩江组三～五段岩心长532.07m,岩心收获率为94.8%,是迄今获取的最连续完整的沉积记录。文章对此进行了厘米级沉积地质描述(分层厚度2～5cm)。嫩三～五段沉积时期与坎潘阶中期对应。通过对松科1井嫩三～五段岩心的精细描述,揭示其岩性-岩相-旋回的沉积序列及其过程。嫩三～五段识别出9种岩石类型,发育曲流河、湖泊和三角洲3种沉积相,河道、堤岸、河漫、三角洲前缘和浅湖5种沉积亚相以及河床滞留、点砂坝、天然堤、决口扇、决口水道、河漫滩、河漫湖、河口砂坝、水下分流河道、水下天然堤、分流间湾、远砂坝、浅湖静水泥、临滨砂坝、浊流15种沉积微相。在岩相序列上共识别出9种共417个米级旋回(六级旋回),94个五级旋回,26个四级旋回,3个三级旋回。连续的组段厘米级刻画为高精度沉积过程研究提供了可能,嫩江组五段厘米级刻画识别出的陆相红层为全球白垩纪富氧事件研究提供了可能的立典剖面,嫩江组三、四段的厘米级刻画为松辽盆地黑帝庙油层的研究与开发提供了不可替代的精准地质资料。

西藏南部晚白垩世坎潘期碳同位素偏移及其意义

对西藏南部定日地区特提斯喜马拉雅晚白垩世坎潘期海相沉积进行高分辨率碳氧同位素分析,获得较为丰富的实验数据。分析表明,δ13C值在坎潘期呈现二高二低变化:坎潘早期较低,平均值约1.2‰～1.3‰;坎潘中期持续升高,平均值1.9‰～2.0‰,并形成正偏高原,到剖面196m位置达到最大值约2.3‰;坎潘晚期变低,平均值在1.2‰～1.4‰范围;坎潘末期再一次升高,均值达2.0‰左右。其中,坎潘中期的正偏高原全球对比研究暗示可能与南半球特别是南极大陆高温和高降雨量有关。根据δ13C值偏移幅度和时间跨度,在坎潘早期、中期和晚期识别出三次负偏事件Ⅰ、Ⅱ、Ⅲ,分别对应于有孔虫G.elevata带下部(剖面162～166m)、G.ventricosa带下部(188～192m)和G.ventricosa带-G.stuartiformis带界线(226～230m),时间跨度平均小于0.74Ma,它们显示了与欧洲同期δ13C值偏移事件的可比性和与Haq等全球I型层序低海平面的相关性。

黑龙江嘉荫晚白垩世渔亮子组孢粉地层研究

黑龙江嘉荫县渔亮子组是我国最早发现爬行动物化石的层位，盛产鸭嘴龙等爬行类化石。前人认为，该组在层位上相当于北美晚白垩世马斯特里赫特期Ｅｄｍｏｎｔｏｎ群、ＨｅｌＣｒｅｅｋ和Ｌａｎｃｅ组。但孢粉化石资料揭示，渔亮子组中的被子植物花粉尚未发展至上述群（组）的阶段，其层位应较之低。

Calcareous Nannoplankton Biostratigraphy of the Bartin Province,Western Black Sea,Turkey

Calcareous nannoplankton biostratigraphy has been performed on five sedimentary sections through the marine Akveren Formation from the Bartin region of northern Turkey, on the southern Black Sea coast. This new biostratigraphy provides an age for the formation of the Early Campanian （nannofossil zone UC15aTp） to Early Selandian （nannofossil zone NPS）, and highlights the presence of the Campanian/Maastrichtian, Cretaceous/Tertiary （K/T）, and Danian/Selandian boundaries in this intermediate palaeolatitude location. Micula murus was identified below the K/T boundary, but Micula prinsii and Nephrolithus frequens were not, which implies that the K/T boundary interval is not complete in the study area. These dates are in agreement with previous micropaleontological studies.

High resolution continuous sedimentary records of Upper Cretaceous obtained from the continental drilling(SK-1) borehole in Songliao Basin:Sifangtai and Mingshui Formations

The Sifangtai and Mingshui formations were continuously cored in the SK-1 n borehole（China Cretaceous Continental Scientific Drilling-SongKe1-the north borehole）.The core is 767.96 m long,and the recovery is 94.7%.The ages of the formations range from middle Campanian to Danian.The sequence and process of lithology-lithofacies and cyclic stratigraphy were described in detail.Eight litho-types compose the Sifangtai Formation,and 15 litho-types compose the Mingshui Formation.Deposition was predominantly in meandering river and lacustrine environments,including 10 microfacies in the Sifangtai Formation and 15 microfacies in the Mingshui Formation.The complete sequence is composed of 535 m-scale cycles（sixth-order cycle）,152 fifth-order cycles,42 fourth-order cycles and five third-order cycles.The centimeter-scale description of the section revealed some previously unknown horizons such as a special type of mudstone,marl,volcanic ash and favorable sand reservoirs in the formations.The new-found evidence is very important for the interpretation of the evolution of the basin,conditions such as lake oxic events,the K/Pg boundary,tectonism in the late sag basin stage,and the reservoir-cap rock assemblages in the shallow stratigraphy.

西藏南部堆纳－岗巴地区晚白垩世瓮虫类及相关微体化石的发现

文章首次报道了产于西藏南部堆纳─岗巴、时代为晚白垩世Ｃａｍｐａｎｉａｎ期宗山组下部的瓮虫类及其相关微体化石，分别概括地说明了它们的形态特征，讨论了它们的系统分类，在Ｃａｌｐｉｏｎｅｌｌｉｄｅａ超科的Ｃａｌｐｉｏｎｅｌｌｉｄａｅ科中，建立新属Ｅｎｄｏｔｈｉｃｏｌｌａｒｉａ属。瓮虫类的相关微体化石，是指过去长期来作为分类位置未定的钙球类分子，它们营浮游生活，常与瓮虫类共生的一类微体化石，现已作为钙质沟鞭藻而归于Ｃａｌｃｉｏｄｉｎｅｌｌａｃｅａｅ科。依据宗山组下部灰岩的岩性特征、时代及微体化石的产状，作者认为上述微体化石为原生成因，提出瓮虫类化石的时代不仅仅局限于晚侏罗世至早白垩世，它们可以延续至晚白垩世Ｃａｍｐａｎｉａｎ期的新的结论。

First description of scleractinian corals from the Santa Marta and Snow Hill Island(Gamma Member) formations, Upper Cretaceous, James Ross Island, Antarctica

Antarctic corals are known from the Upper Cretaceous Santa Marta Formation(Santonian–early Campanian)and Gamma Member(late Campanian)of Snow Hill Island Formation(late Campanian–early Maastrichtian)but they have not so far been taxonomically described.We describe three corals taxa based on 29 specimens collected in 2007 and 2016 on James Ross Island(northeast of the Antarctic Peninsula).They represent the first formal record of scleractinian corals from the Santa Marta Formation,identified as Caryophylliidae indet.and Gamma Member of Snow Hill Island Formation,identified as Astreopora sp.and Fungiacyathus deltoidophorus.The family Caryophylliidae and the genus Astreopora were not restricted to the Weddellian Biogeographic Province but the species Fungiacyathus deltoidophorus was endemic to Antarctica during the Cretaceous.The genus Fungiacyathus and the family Caryophylliidae thrive in Antarctica until the present day.Fungiacyathus occurred in shallower environments during the late Campanian than today.No specimens related to Astreopora have yet to be found in Antarctica after the late Campanian.This can be explained by the capacity of Fungiacyathus and Caryophyllidae to endure cold waters,since they are asymbiotic corals.The symbiotic Astreopora sp.,due to its sensitivity to low temperatures,became extinct in this continent as soon as the Antarctic waters began to cool,around the Campanian/Maastrichtian.The presence of Astreopora sp.in Gamma Member of Snow Hill Island Formation may represents the first occurrence of this genus in Antarctica and the oldest record of this genus in the Southern Hemisphere.

Biozonation and Paleobathymetry on Foraminifera Upper Cretaceous Deposites of Central Iran Basins (Isfahan, Baharestan Section)

In this study Late Cretaceous stratum in central Iran, Baharestan section in Isfahan area, was evaluated by biozonation and paleobathymetry.?These sediments have 89 meters thick, and strata have been formed of marl and marl limestone. In order to indicate the ancient depth of Upper Cretaceous at this time, planktonic and benthic foraminifera were studied. The percentage of the total planktonic foraminifera to the whole sample of foraminifera after the removal of indwell benthic foraminifera (%P*) using the formula?D?=?e(3.58718 + (0.03534?×?%P*))?was identified and depth of 200 - 450 meters was achieved for them. In the present investigation, 30 planktonic species of 11 genus have been identified. The Upper Cretaceous deposit was divided to 6 biozones on the basis of planktonic foraminifera which are cosmopolitan and consist of: Biozone 1—Marginotruncana sigali-Dicarinella primitiva?partial range zone;?Biozone 2—Dicarinella concavata?interval zone;?Biozone 3—Dicarinella asymetrica?total range zone;Biozone 4—Globotruncanita elevata?partial range zone;Biozone 5—Globotruncana ventricosa?interval zone;Biozone 6—Radotruncana calcarata?interval zone.?Based on planktonic foraminifera, the Upper Cretaceous sediments in the study area are of the Turonian-Late Campanian ages.

西藏中部若干地层问题讨论

野外考察和有关的研究结果表明,白垩纪阿尔布—赛诺曼期,在西藏中部沉积了由海相灰岩组成的郎山组;白垩纪坎潘期,在班戈一带出现由磨拉石建造组成的竞柱山组;新近纪中—上新世,西藏中部沉积了湖相的丁青组。因此,前人关于该区一些地层归属的厘定值得商榷。

台湾东部未变形花岗岩LA-ICP-MS锆石U-Pb定年及其地质意义

台湾源头山位于台湾岛东部太鲁阁带的北部,主体为花岗闪长岩-辉长岩"浆混岩"组合,发生了强烈变形变质,其中央分布有未变形的侵入体,具有典型岩浆岩特征,代表了变形变质期后的岩浆事件。通过开展野外地质调查和岩石学、同位素年代学研究,揭示了变形变质作用前后侵入岩在岩石特征及主量、微量元素方面存在明显差别,表明二者是不同构造岩浆事件的产物。未变形的侵入岩为石英闪长岩,具有高Pb、Rb、U、Th、Zr轻度富集特征,属典型的Ⅰ型花岗岩,其LA-ICPMS锆石U-Pb年龄为82±1Ma,属晚白垩世坎潘期。这是台湾东部地区变形变质事件结束的标志,其后台湾东部进入了一个非挤压的新构造作用阶段。