苏州用直第四纪地层划分

叙述了苏州用直地区SK03孔第四纪的岩性地层.岩性地层有更新世海门组、启东组、昆山组、滆湖组和全新世如东组;生物地层划分了7个有孔虫组合;磁性地层划分了2个极性世.并对地层进行了综合划分.     

苏州甪直第四纪地层划分

叙述了苏州甪直地区SK03孔第四纪的岩性地层。岩性地层有更新世海门组、启东组、昆山组、滆湖组和全新世如东组；生物地层划分了7个有孔虫组合；磁性地层划分了2个极性世。并对地层进行了综合划分。     

四川省纳溪县上马剖面侏罗系至白垩系古地磁研究

运用磁性地层学研究岩石单元磁性特征,是一种有效的地层对比方法。上马剖面按地层序列磁性特征的分异把磁极性一致或极性反向频率大致相当的区段组合在一起,由此划分了３３个磁性地层极性带,３个极性亚超带,２个极性超带,可与国际标准磁极性年表对比。     

米仓山南缘奥陶纪地层新见

详细描述了米仓山南缘奥陶系剖面,将该奥陶系划分为湄潭组,宝塔组和龙马溪组三个岩石地层单位,并探讨了其空间变化规律,同时根据生物组合特征建立了四个生物带,发现了Ｈｉｒｎａｎｔｉａ－Ｋｉｎｎｅｌｌａ组合带的存在,拟定后的龙马溪组为一跨晚奥陶世－－早志留世的岩石地层单位。     

苏州甪直第四纪重矿物地层及其意义

苏州直地区SK03孔第四纪的岩石地层有更新世海门组、启东组、昆山组、滆湖组和全新世如东组.采用重矿物组合方法,对第四系地层进行划分,共划分了10个组合,并对重矿物组合类型的地质意义进行了讨论.它不仅是岩石地层划分的依据,而且对古气候和沉积环境的分析也有指导意义.     

苏州直第四纪重矿物地层及其意义

苏州直地区 SK03孔第四纪的岩石地层有更新世海门组、启东组、昆山组、湖组和全新世如东组.采用重矿物组合方法,对第四系地层进行划分,共划分了 10个组合,并对重矿物组合类型的地质意义进行了讨论.它不仅是岩石地层划分的依据,而且对古气候和沉积环境的分析也有指导意义.     

上海晚新生代地层的划分

据岩石地层、气候地层、生物地层和磁性地层等方法综合,将上海疏松地层划分为上第三系和第四系。古地磁测量表明,第四系和上第三系之间的界限位于考克斯年表上高斯正极性期凯纳事件或为英斯事件处。这与河北阳原盆地泥河湾、云南元谋盆地、华北平原东部及长江三角洲可以对比。上第三系为中新统白龙港玄武岩和陆相沉积的上新统崇明组组成。第四系划分为四个“统”,十“个组”。     

安徽省华北型石炭—二叠纪地层多重划分与对比

安徽省华北型石炭—二叠纪地层的划分与对比一直存在着不同的观点。在《中国地层指南及中国地层指南说明书》（2001）思想框架下,采用多重地层分类原则,对区内岩石地层、生物地层、年代地层和层序地层进行划分对比研究。岩石地层可划分为本溪组、太原组、山西组、下石盒子组、上石盒子组和孙家沟组,其中山西组和上石盒子组为主要含煤地层;在生物地层方面,建立2个组合带和5个植物组合带;区内石炭纪地层仅发育上石炭统,二叠纪地层齐全;区内石炭二叠系含煤地层划分为6个三级层序。通过多重地层划分与对比,突出了不同地层单位的属性特征,优化了区域等时地层格架,有助于煤炭资源的预测与评价。     

包头地区晚更新世—全新世地层划分对比及环境变迁

对包头平原第四纪堆积物的年代地层、生物地层、岩石地层和磁性地层的研究表明,该区晚更新世—全新世地层可与我国华北晚更新世—全新世典型地层剖面——萨拉乌苏河滴哨沟湾剖面对比,并可进一步划分出萨拉乌苏组、城川组、大沟湾组和滴哨沟湾组。这一研究不仅重新厘定了包头平原这一时段地层的层序,完成大区域地层对比,同时也为研究包头地区乃至呼包盆地晚更新世—全新世古气候和古地理环境变迁提供了基础资料。     

贵州紫云晒瓦晚二叠世深水相地层

通过对晒瓦晚二叠世岩石地层和生物地层的初步研究 ,认为晒瓦晚二叠世地层属于深水相沉积 ,可划分成4段 ;并根据双壳类、腕足类延限和发育特征 ,分别建立了一个双壳类化石带 (Claraia primitiva- H unanopecten exi-lis组合带 )和二个腕足类化石带 (N eochonetes substrophomenoides- Orthothetina ruber组合带 ,Acosarina dorsisulca-ta- Crurithyris speciosa组合带 ) ;在对牙形石、双壳类和腕足类等典型化石的综合研究基础上 ,首次划分出吴家坪阶和长兴阶 ,改变了以往本区晚二叠世年代地层未细分的状况 ,提高了划分对比精度。     

新疆拜城古近系磁性地层划分

通过对研究区387个可靠退磁数据的分析,确定其原生剩磁的极性及其变化。在此基础上根据古地磁测试资料,引入小波分析方法,对塔里木盆地拜城古近纪红层进行了磁性地层精确划分,确定了不同层段的地质时代,建立了克拉苏河剖面磁性地层柱。样品测试结果表明,绝大部分样品的磁性较强,退磁曲线质量较高,且分离出两个稳定分量:低温分量和高温分量,由此进行主分量分析并利用菲舍尔统计法求得最终结果,在小波分析方法的帮助下,参照国际标准磁性地层年表和综合地层划分方案,建立克拉苏河磁性地层柱。确定出吉迪克组/苏维依组,苏维依组/库姆格列木组以及库姆格列木组底界年代分别为27.7M a、38M a、60.5M a。其沉积速率在10130mm/m a。      

Late Cenozoic magnetostratigraphy (11 – 0 Ma) of the Dongshanding and Wangjiashan sections in the Longzhong Basin,western China

A paleomagnetic study of the 510-m-thick Wangjiashan section of Late Miocene and Pliocene terrestrial sediments reveals a fairly complete reversal record with ages from 11 to 1.8 Ma. The magnetostratigraphy of the Dongshanding section, located nearby, reveals a partially overlapping reversal record with ages from 2.2 to 0 Ma, and facilitates correlation of the Wangjiashan section with the global polarity time scale. A new stratigraphic division of the Wangjiashan section replaces the name Linxia formation by five new formation names, based on lithologic variation and mammalian fossil finds. The new formations and their magnetostratigraphically determined ages are: Dongshan Formation (c. 1.75–2.6 Ma), Jishi Fm. (c. 2.6–3.6 Ma), Hewangjia Fm. (4.5–6.0 Ma), Liushu Fm. (6.0–7.6 Ma), and Dongxiang Fm. (7.6–c. 12 Ma). The Neogene stratigraphy and fossil mammals suggest that the nearby part of the Tibetan Plateau experienced a persistent denudation during the Late Miocene and Early Pliocene, but that it was uplifted more rapidly at about 3.6 Ma.     

塔里木盆地沙雅隆起托甫2井志留系划分对比

托甫2井志留系发育不全,仅残存下统(兰多维列统)柯坪塔格组与塔塔埃尔塔格组,柯坪塔格组分为三段:上下为砂岩段,中间为泥岩段,颜色以灰色、灰绿色为基调.塔塔埃尔塔格组为褐色、棕红色细砂岩与泥岩.在柯坪塔格组中下段获丰富的笔石、几丁石与疑源类化石,详细地讨论了这些属种的时代分布与地理分布,根据生物群特征,可将其归入3个化石组合(带),即Parakidograptus acuminatus,Belonechitinacf.postrobusta-Spinachitina sp.nov.与Dactylofusa cabottii-Cymatiosphaera densisepta-Leiosphaeridia组合,首次为主要勘探目的层之一的柯坪塔格组划分与对比提供了多门类的化石依据.托甫2井志留系可划分为1个Ⅱ级层序,4个Ⅲ级层序;Ⅱ级层序的顶、底界分别为区域不整合面T06与T07,具有明显的下削、上超特征.并以岩石地层为基础,生物地层为依据,结合测井地层与层序地层,厘定了托普2井志留系地层层序及组段的岩电特征,同时建立了覆盖区井下柯坪塔格组下段与上奥陶统桑塔木组的划分标准.     

碎屑岩沉积微相工业制图方法及应用探讨--以辽河欢喜岭油田齐108块莲花油层为例

根据层序地层学及动力沉积学原理,结合开发层系需要,将齐108块莲花油层分为3个油层组10个砂岩组,该油层可识别出Gm,Ss,Sm,Smg,Sp,Sw,Sh,Sr,Sm,Sf和Sds等11种岩石（性）相,它们构成了二级扇三角洲沉积模型,细分出水下分流河道、前缘砂坝等７种沉积微相,利用古河道趋势分析法,编绘了不同时期砂体的分布网络及沉积微相图,砂体分布明显受控于水下分流河道的展布趋势,不同级别水下分流河道砂体构成了研究区的主要储集层,控制了储层的非均质性,并讨论了沉积微相研究在油田开发中的作用。     

Pliocene and Pleistocene magnetic stratigraphy in Le Castella area,Southern Italy—A preliminary report

A preliminary study was made of the magnetic stratigraphy of the Pliocene and Lower Pleistocene marine sediments in Le Castella area, Calabria, Southern Italy. Microbiostratigraphic evidence of the measured sediments provides a basis for tentative correlation with the standard magnetic chronology. The Gilsa Event in the Matuyama Reversed Polarity Epoch is estimated to be a little older than the lower limit of the Calabrian in Le Castella area.     

Speleology and magnetobiostratigraphic chronology of the Buffalo Cave fossil site, Makapansgat, South Africa

Speleological, stratigraphic, paleomagnetic and faunal data is presented for the Buffalo Cave fossil site in the Limpopo Province of South Africa. Speleothems and clastic deposits were sampled for paleomagnetic and mineral magnetic analysis from the northern part of the site, where stratigraphic relationships could be more easily defined and a magnetostratigraphy could therefore be developed for the site. This is also where excavations recovered the fossil material described. A comparison of the east and South African first and last appearance data with the Buffalo Cave fauna was then used to constrain the magnetostratigraphy to produce a more secure age for the site. The magnetostratigraphy showed a change from normal to reversed polarity in the basal speleothems followed by a short normal polarity period in the base of the clastic deposits and a slow change to reversed directions for the remainder of the sequence. The biochronology suggested an optimal age range of between 1.0 Ma and 600,000 yr based on faunal correlation with eastern and southern Africa. A comparison of the magnetobiostratigraphy with the GPTS suggests that the sequence covers the time period from the Olduvai event between 1.95 and 1.78 Ma, through the Jaramillo event at 1.07 Ma to 990,000 yr, until the Bruhnes-Matuyama boundary at 780,000 yr. The faunal-bearing clastic deposits are thus dated between 1.07 Ma and 780,000 yr with the main faunal remains occurring in sediments dated to just after the end of the Jaramillo Event at 990,000 yr.     

印度阶-奥伦尼克阶界线层型候选剖面--安徽巢湖平顶山西剖面地层序列

位于安徽省中部巢湖市郊的平顶山西剖面被推荐为印度阶-奥伦尼克阶界线的全球层型候选剖面。系统记述了该剖面的地层序列,包括岩石地层、生物地层、磁性地层、碳氧同位素地层和旋回地层等方面的最新研究成果。该剖面包括3个岩石地层单元、7个牙形石带、5个菊石带、3个双壳类带;在剖面下段地层中识别出2个正向磁性带和2个反向磁极性带;与地球轨道天文周期相对应的Milankovitch气候沉积旋回也可以明确地辨认;碳氧同位素δ1 3Ccarb演变呈现两次大的旋回。以牙形石N eospathodus waageni首现定义的印度阶-奥伦尼克阶界线在该剖面上位于三叠系第二个主要的正向极性带近顶部,也接近三叠纪碳同位素δ1 3Ccarb首次正向漂移峰值处     

Magnetostratigraphy of the Maastrichtian continental record in the Upper Aude Valley (northern Pyrenees,France): Placing age constraints on the succession of dinosaur-bearing sites

The first detailed stratigraphic succession of the Upper Cretaceous continental record from the Upper Aude Valley (southern France) is presented together with a magnetostratigraphic study. The combined stratigraphy and magnetostratigraphy of the Marnes rouges inférieures Fm (Lower Red Marls), constrained by biochronological markers such as charophyte occurrence and revised dinosaur eggshells, results in a succession of fluvial red beds dated from chron C32n to the top of chron C31r. It implies an earliest Maastrichtian age close to the C32n.1n-C31r reversal for the majority of the dinosaur sites including Bellevue. In contrast, the upper Maastrichtian is likely represented by a short interval within the lacustrine-palustrine Calcaires et argiles de Vignevieille Fm (Vignevieille Limestones), or it might even not be recorded. The proposed age indicates that the marine to continental transition, as a result of the Late Cretaceous transgression, took place earlier in the north Pyrenean basin than in the southern area.     

广东三水芦苞-大塘地区古近纪早中期淡水生物群的发现及其地质意义

对研究区内地层进行了多重划分对比,将古近纪地层划分为莘庄村组、土布心组、宝月组和华涌组4个岩石地层单位,并在该地层中首次发现轮藻、介形虫、腹足类、双壳类、鱼类、植物6个门类7个化石组合25属60余种生物化石,填补了本区生物地层的空白。根据岩石地层层序、生物组合特征和7个动植物化石组合的国内外对比,确定其形成时代为古新世-始新世,形成环境为陆相淡水,气候干旱、炎热。喜马拉雅运动使本区抬升为陆地,进一步证实晚古新世海侵边界大致在南边镇-水锅尾-基塘连线之南东地带。