塔里木板块晚奥陶世桃曲坡牙形石属的分布及对比北大核心CSCD

塔里木板块见有桃曲坡牙形石Taoqupognathus An的两个种:Taoqupognathus blandus An和T.tumidus Trotter&Webby。T.blandus的出现层位、产出层位、共生牙形石分子与鄂尔多斯盆地大致相同,始于Belodina compressa/Periodon grandis组合,上延至Yaoxianognathus yaoxianensis带,广泛分布于塔里木库鲁克塔格地区乌里格孜塔格剖面乌里格孜塔格组和轮南、英买力、塔中等二十余口钻井剖面的良里塔格组;T.tumidus见于轮南、英买力、塔中少数钻井剖面良里塔格组上部至桑塔木组Yaoxianognathus yaoxianensis带。Taoqupognathus An的始现层位比澳大利亚低,消失层位比澳大利亚更高;T.tumidus存在层位与澳大利亚大致相当。     

塔里木板块晚奥陶世桃曲坡牙形石属的分布及对比

塔里木板块见有桃曲坡牙形石Taoqupognathus An的两个种:Taoqupognathus blandus An和T.tumidus TrotterWebby。T.blandus的出现层位、产出层位、共生牙形石分子与鄂尔多斯盆地大致相同,始于Belodina compressa/Periodon grandis组合,上延至Yaoxianognathus yaoxianensis带,广泛分布于塔里木库鲁克塔格地区乌里格孜塔格剖面乌里格孜塔格组和轮南、英买力、塔中等二十余口钻井剖面的良里塔格组;T.tumidus见于轮南、英买力、塔中少数钻井剖面良里塔格组上部至桑塔木组Yaoxianognathus yaoxianensis带。Taoqupognathus An的始现层位比澳大利亚低,消失层位比澳大利亚更高;T.tumidus存在层位与澳大利亚大致相当。     

新疆库鲁克塔格奥陶系的划分与对比

新疆库鲁克塔格奥陶系特别发育,分布较广,化石丰富。本文根据岩性和化石,分为下统雅尔当组、巷古勒塔格组、雅尔当布拉克组;上统却尔却克组、穆赫来布拉克组、乌里格孜塔格组和元宝山组,上与石炭系呈假整合接触,下与上寒武统为整合接触。     

木孜塔格幅、鲸鱼湖幅地质调查新成果及主要进展

发现并填绘出前寒武纪地层单元.于木孜塔格地区下石炭统托库孜达坂群中发现早石炭世放射虫.在阿尔格山大断裂以南中二叠统鲸鱼湖组灰岩中首次发现冷温型单通道(竹蜓).在黑顶山缝合带中识别出畅流沟-向阳泉和木孜塔格蛇绿混杂岩带,二者分别形成于新元古代早、晚期.对各构造带中的岩石地层进行了古地磁研究与对比,建立了各自的古地磁极移曲线.获取一批新生代火山岩的同位素测年资料.     

木孜塔格幅、鲸鱼湖幅地质调查新成果及主要进展

发现并填绘出前寒武纪地层单元。于木孜塔格地区下石炭统托库孜达坂群中发现早石炭世放射虫。在阿尔格山大断裂以南中二叠统鲸鱼湖组灰岩中首次发现冷温型单通道筵。在黑顶山缝合带中识别出畅流沟-向阳泉和木孜塔格蛇绿混杂岩带，二者分别形成于新元古代早、晚期。对各构造带中的岩石地层进行了古地磁研究与对比，建立了各自的古地磁极移曲线。获取一批新生代火山岩的同位素测年资料。     

中昆仑北部地区构造地层学初步研究

中昆仑北部造山带可分为 5个构造地层区 :白干湖、求勉雷克、大九坝、祁漫塔格南缘和祁漫塔格北缘。白干湖和求勉雷克构造地层区出露前寒武纪变质结晶基底 ;早古生代期间 ,祁漫塔格洋沿鸭子泉—阿特阿特坎河断裂向北西俯冲碰撞 ,在祁漫塔格北缘沉积了古海沟岛弧浊积岩、晚泥盆世蛇绿混杂岩 ,在祁漫塔格南缘被动大陆边缘上发育晚泥盆世前陆磨拉石沉积 ;晚古生代早期 ,昆中求勉雷克地区简单剪切滑覆 ,在祁漫塔格南、北缘形成浅海相沉积 ,而大九坝地区由于断层高角度伸展 ,沉积了一套海相碳酸盐岩建造 ;晚古生代晚期 ,特提斯洋沿昆中断裂斜向俯冲 ,在大九坝出露了托库孜达坂蛇绿混杂岩和早二叠世前陆盆地堆积 ;晚三叠世陆相火山岩出露于祁漫塔格山南缘。     

新疆伊热达坂铅锌矿矿床地质特征及找矿标志

伊热达坂铅锌矿区位于塔里木微板块的塔里木北缘古生代被动陆缘带,阿尔彼什麦晚古生代前陆盆地,矿体主要赋存于上泥盆统哈孜尔布拉克组下段（D3h1）。本文主要对伊热达坂铅锌矿床地质特征进行分析和总结,初步揭示矿床的找矿标志。     

东昆仑卡特里西铜锌矿成因

卡特里西铜锌多金属矿是新疆东昆仑地区首次发现的海相火山沉积型硫化物矿床,该矿产于下石炭统托库孜达坂群内的火山岩地层中,矿体分布明显受地层控制,含矿岩性为一套双峰式火山岩上部的灰绿色基性凝灰岩,一般呈平行层状、似层状、透镜状夹于灰岩中及灰岩与含炭粉砂岩的接触处。该矿海相火山沉积特征明显,为在相对封闭的浅海盆地内,火山活动形成的成矿物质在火山机构边部洼地内堆集形成。东昆仑下石炭统托库孜达坂群地层中海相火山岩带分布有众多铜多金属矿点,为一较有前景的海相火山岩型铜矿成矿带,卡特里西铜锌矿找矿及成因认识上的突破不但填补了东昆仑一带该矿床类型的空白,而且对在该区广泛分布的托库孜达坂群内火山岩系地层中寻找该类矿床具有重大指导意义。     

新疆西昆仑奥依塔格一带铜矿地质特征及成矿远景

近年来西昆仑基础地质及矿床地质发展迅速,尤以金属矿产的发现最为突出,比如塔什库尔干县赞坎一带的沉积变质型铁矿(刘建平等,2009;冯昌荣等,2011),如赞坎、莫喀尔、叶里克等已达大型以上;新发现的喀拉果如木铜多金属矿(王核,2010)、喀依孜钼(铜)矿具有斑岩铜矿特征。本文通过对奥依塔格一带铜矿地质特征总结,希望对该带铜矿赋存的地质规律及勘探有一定的启示作用。     

柴达木盆地北缘石炭系顶、底界线再认识

根据近年来确定的国际年代地层界线标准讨论了柴达木盆地北缘石炭系的顶、底界线。把石炭系的底界置于陆相沉积的阿木尼克组和海相沉积的穿山沟组之间。认为阿木尼克组可以与泥盆、石炭纪之交的全球性海退事件层对比 ,穿山沟组底界是这个海退事件层之上的海进面 ,相当于三级层序初始海泛面。把石炭、二叠系界线置于扎布萨尕秀组上段类Pseudoschwagerina组合带或Sphaeroschwagerina带之底部。这个界线大体相当于以牙形石Streptognathodusisolatus首现为标志确定的二叠系底界。     

湘中佘田桥剖面上泥盆统弗拉斯阶地层研究新进展

湘中佘田桥剖面的佘田桥阶大致与弗拉斯阶范围一致 ,其下为吉维阶泥质灰岩 ,含腕足类 Emanuella tak-wanensis等及竹节石 Viriatellina kienelensis等。佘田桥阶自下而上分别为榴江组、蒸水河组、老江冲组。榴江组主要是紫红色粉砂质泥岩 /粉砂岩互层、底部为黑色薄层硅质岩。蒸水河组下部以灰黑色及暗灰色钙质泥页岩为主 ,含介形虫 Bertillonella erecta、B.cicatricosa?、Franklinella calcarata、Entomozoe(N ehdentomis) tenera及菊石 Meso-beloceras?sp.;上部泥质灰岩、似瘤状灰岩、粉砂质泥岩含牙形石 Palmatolepis cf.semichatovae、大型菊石 Mantico-ceras sp.及介形虫 Entomozoe(N ehdentomis) pseudorichterina。老江冲组以泥页岩为主 ,顶部附近则出现一些泥质灰岩、似瘤状泥灰岩层 ,产丰富的小嘴贝类、无洞贝类及弓石燕类等腕足动物 ,少量海绵 (?)及珊瑚等。佘田桥阶的顶界与弗拉斯阶的顶界一致 ,即以无洞贝类和大量四射珊瑚的绝灭为标志 ,而 Yannanellina腕足动物群的出现开始于锡矿山阶 (或法门阶 )。综合各类化石资料 ,佘田桥剖面的榴江组大致相当于牙形石 falsiovalis带— punctata带 ,蒸水河组相当于 L ower hassi带— L ower rhenana带 ,老江冲组相当于 U pper rhenana带— linguiform     

“Sub-Triticites Beds” of the Donskaya Luka and lower boundary of the Kasimovian Stage

Micro- and macrofauna remains were studied from transitional deposits of Moscovian and Kasimovian Stages in the Donskaya Luka (Volgograd Region). The preliminary analysis of microfauna showed that “sub-Triticites Beds” of the Donskaya Luka contain fusulinid and conodont assemblages enabling correlation of the Middle and Upper Carboniferous deposits in the study region with the type sections of Moscow area and Donbass. Conodonts from the “sub-Triticites Beds” stratotype were studied for the first time. As is established, upper part of the Sukhov Fm. and the base of the Seleznev Fm. belong to the Protriticites pseudomontiparus-Obsoletes obsoletus Zone. Based on fusulinids, higher parts of the Seleznev Fm. belong to the Montiparus Zone of the Khamovnikian Substage, whereas conodonts suggest their correlation with lower part of the Khamovnikian Substage, i.e., with the Ratmirovo Fm. or a basal part of the Neverovo Fm. Middle part of the Seleznev Fm. is correlated to middle cycle of the Neverovo Fm. of the Khamovnikian Substage in Moscow area. The Middle-Upper Carboniferous boundary deposits of the Donskaya Luka are represented by deposits of extremely shallow-water settings and contain only sporadic microfauna. These sections cannot be considered as possible candidates for the GSSP of the Kasimovian Stage base.     

Temporal and Spatial Distribution of the Late Devonian (Famennian) Strata in the Northwestern Border of the Junggar Basin, Xinjiang, Northwestern China

The base of the Saerba Member (Mbr) of the Hongguleleng Formation (Fm.) probably lies in the Famennian Palmatolepis crepida Zone; the Longkou Mbr is probably a sedimentary wedge that thins out northwards; the Duguer Mbr has an approximate age from the upper part of the Pa. marginifera Zone or the Lower Pa. rugosa trachytera Zone through the top of the Pa. perlobata postera Zone; the Wulan Mbr has an age approximately corresponding to the whole Pa. gracilis expansa Zone. In the Bulongguoer section, the Lower Mbr of the Hongguleleng Fm. corresponds to Famennian Pa. crepida Zone through Pa. marginifera Zone; the Middle Mbr probably ranges from the Pa. r. trachytera Zone through the Pa. g. expansa Zone. The basal Namu Mbr of the Heishantou Fm. is probably the product during and after the Hangenberg Event in the upper part of the Siphonodella praesulcata Zone, which is still within the Devonian. In this context, the underlying Chasi Mbr may approximately correspond to the lower part of the S. praesulcata Zone (before the Hangenberg Event). Lateral distribution of strata indicates that the Upper Devonian in the Gennaren and Saerba areas each constitutes a structure of syncline, which differs from the previous recognition of a monocline structure.     

嘉禾石炭—二叠系界线新认识

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。     

安徽淮北地区寒武系“崮山阶”—凤山阶新知

根据三叶虫Acanthometopus obesus、Trianguraspis nodus、Petalocephalus laevis、Taishaniasp.等的发现,将淮北地区捻山剖面原属凤山阶的地层划归长山阶,以Acanthometopus带作为该区长山阶最顶部的三叶虫带,淮北地区凤山阶与长山阶的界线应在Ptychaspis-Tsinania带与Acanthometopus带之间;通过与标准剖面及邻近地区的对比,淮北地区的崮山组应予解体,原崮山组上部与炒米店组岩性一致,应划入炒米店组,其下部岩性与张夏组一致,应划入张夏组,淮北地区无崮山组。淮北地区的炒米店组跨越了整个长山阶和凤山阶中下部,据岩性差异可分为上、下两段;炒米店组在华北地区具有明显的穿时性,其底界从长山阶底界跨至凤山阶顶界。     

Carbon Isotope Features of the Sugetbrak Section in the Aksu?Wushi Area, Northwest China: Implications for the Precambrian/Cambrian Stratigraphic Correlations

The upper Qigeblaq Formation （Fm） dolostones and the Yurtus Fm phosphatic cherts, black shales, limestones, and dolostones are widely distributed in the Precambrian/Cambrian transitional succession of the Aksu-Wushi area. Negative δ13C excursion above the Yurtus Fm/ Qigeblaq Fm boundary was determined in this study. The pronounced negative carbon isotope excursion occurs in the phosphatic chert layers at the bottom of the Cambrian Yurtus Fm, below which the first appearance of the Asteridium- Heh＇osphaeridium-Comasphaeridium （AHC） acritarch assemblage zone. The δ13C curve of the lower part of the Yurtus Fm in the Aksu-Wushi area was found to be correlated with the early Cambrian δ13C curves of the Zhujiaqing Fm （Daibu Member）, the lower part of the Yanjiahe Fm on the Yangtze Platform in China, the lower Tal Fm in India, the Sukharikha Fm in Siberia, and the upper part of the Tsagaan Oloom Fm in Mongolia through biostigraphy. The lower part of the Yurtus Fm in the Tarim Basin is at the Nemakit-Daldynian stage, and the Precambrian/Cambrian boundary of the Aksu-Wushi area may be located in the phosphatic chert unit which just below the first appearance AHC acritarch assemblage zone. The negative δ13C excursion （N1） across the Precambrian/Cambrian boundary in the studied section may have resulted from oceanic overturning and sea level rise.     

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

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。     

华南上泥盆统和下石炭统层序地层学

本文把华南法门阶上部和杜内阶分为４个层序，自下而上依次命名为ＳＱ０、ＳＱ１、ＳＱ２和ＳＱ３。其中ＳＱ０属斯图年阶（Ｓｔｒｕｎｉａｎ）（泥盆系最顶部），其余３个层序归杜内阶。这４个层序可以与欧美等地同期的层序进行对比，表明当时的海平面升降变化及其由此而产生的沉积层序具有全球的一致性。层序地层学、生物地层学和事件地层学综合研究表明，华南浅海相区与Ｓｉｐｈｏｎｏｄｅｌａｐｒａｅｓｕｌｃａｔａ－Ｓ．ｓｕｌｃａｔａ界线一致的泥盆－石炭系界线不仅高于Ｃｙｓｔｏｐｈｒｅｎｔｉｓ带顶界，而且还应高于引起Ｃｙｓｔｏｐｈｒｅｎｔｉｓ绝灭的海退事件层的顶界。因此建议以Ｃｙｓｔｏｐｈｒｅｎｔｉｓ－Ｐｓｅｕｄｏｕｒａｌｉｎａ间隔带中最明显的一个海进面，即ＳＱ１的海进体系域的底界作为华南浅海相区泥盆－石炭系界线。这条界线与泥盆－石炭纪之交海退事件层的顶界正好一致，大致相当于Ｐｓｅｕｄｏｕｒａｌｉｎａ组合带底部。     

一条新发现的奥陶系—志留系界线剖面

在贵州省桐梓县红花园乡南坝子村发现一条新的穿越奥陶系—志留系界线的地层剖面。该剖面自下而上依次出露有宝塔组、涧草沟组、五峰组和龙马溪组等,露头良好,产状平缓,化石丰富。其五峰组观音桥段顶部与龙马溪组交界处,即穿越奥陶系—志留系界线的一段地层,横向上可连续追索逾百米。自五峰组底部到龙马溪组底部(相当于D icellograptus complanatus带—Coronograptus cyphus带下部)的地层中已发现25层斑脱岩。根据生物地层、层序地层等资料初步确认了这些斑脱岩与湖北宜昌等地的斑脱岩具高分辨对比性。该剖面的发现为华南奥陶系—志留系界线附近的各项研究提供了新的资料。     

内蒙古呼鲁斯太石炭纪脊椎动物化石

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