A New Species of Liadotaulius (Insecta: Trichoptera) from the Middle Jurassic of Daohugou,Inner Mongolia

Diverse caddis flies are recently collected from the Middle Jurassic Daohugou fauna in Ningcheng County, Inner Mongolia, northern China, and different types of caddis cases have been reported in the same locality. A new species of caddisfly, Liadotaulius daohugouensis sp. nov. is described and illustrated; the establishment is based on a well-preserved isolated forewing collected from the Middle Jurassic Jiulongshan Formation of Daohugou. The family status of Liadotaulius is discussed on the basis of new material and is referred to the family Philopotamidae. The Daohugou fauna continues to provide new data for studying the early evolution of Trichoptera.     

The characteristic target-pattern regional ore zonality of the Nanling region, China (Ⅲ)

By applying the ‘theory of synchronization' from the science of complexity to studying the regional regularity of ore formation within the Nanling region of South China,a characteristic target-pattern regional ore zonality has been discovered.During the early and late Yanshanian epoch (corresponding respectively to the Jurassic and Cretaceous periods),two centers of ore formation emerged successively in the Narding region; the former is mainly for rare metals (W,Sn,Mo,Bi,Nb) and one rare earth element (La) and was generated in the Jurassic period; whereas the latter is mainly for base metals (Cu,Pb,Zn,Sb,Hg),noble metals (Au,Ag),and one radioactive element (U) and was generated in the Cretaceous period.Centers of ore formation were brought about by interface dynamics respectively at the Qitianling and Jiuyishan districts in southern Hunan Province.The characteristic giant nonlinear target pattern regional ore zonality was generated respectively from the two centers of ore formation by the spatio-temporal synchronization process of the Nanling complex metallogenic system.It induced the collective dynamics and cooperative behavior of the system and displayed the configuration of the regional ore zonality.Then dynamical clustering transformed the configuration into rudimentary ordered coherent structures.Phase dynamics eventually defined the spatio-temporal structures of the target-pattern regional ore zonality and determined their localization and distribution.The integral successive processes of synchronization-dynamical clustering-phase dynamics accomplished the regional ore zonality by way of "multiple field dynamics" of spatio-temporal superposition of multiple coupled pulsatory solitary wave trains of the zonal sequences of different ores.A new methodology for revealing regional ore zonality is developed,which will encourage further investigation of the formation of deep-seated ore resources and the onset of large-scale mineralization.     

西藏申扎永珠乡晚石炭世和早二叠世的腕足动物化石

申扎地区石炭二叠系发育良好,化石丰富。本文描述的化石采自上下两个层位,下部化石少,以石燕贝类为主, 其组合特征反映了石炭纪腕足类的特点与改则县玛米雪山地区上石炭统所产相似;上部化石丰富,以石燕贝类的Spiriferella和Syrin-gothyris的出现为特征,共生还有长身贝类的Chonetinella,Echinauris,Tylo-pecta等。这个化石组合与西藏其他地区相同时代的化石组合不同。特别是Syringothy-ris在下二叠统的发现具有重要意义。     

鲁西南地区石炭纪—二叠纪含煤岩系层序地层及聚煤特征

根据钻井、测井和地质等资料,对鲁西南地区石炭纪—二叠纪含煤岩系进行了层序地层学与聚煤作用研究。识别出以区域不整合面、古土壤层底面、海侵方向转换面、下切谷砂体底面为代表的4种类型的层序界面;划分出本溪组、太原组、山西组和下石盒子组中的4个三级层序,从下到上依次为SⅢ1、SⅢ2、SⅢ3及SⅢ4。通过对比研究不同层序的含煤性及煤层的发育特征后认为,形成于分流间湾沼泽环境的SⅢ3煤层发育最好,形成于潟湖与沼泽环境的SⅢ1及SⅢ2煤层发育次之,SⅢ4没有煤层发育。在同一个层序内部,泥炭聚集速率与可容空间增加速率之间的平衡状态决定了煤层的厚度,这种平衡状态保持较长时间是煤层形成的基本条件,而与泥炭聚集有关的可容空间的持续增加需要基准面的不断抬升,因此,发育较好的煤层最可能形成于海侵体系域末期,如SⅢ3的TST末期的3号煤层。     

贵州遵义二叠纪锰矿气液喷口群的发现及地质意义

在通过对遵义市锰矿整装勘查区及周边所有探矿工程资料整理、分析研究的基础上,结合野外大比例尺专项地质填图、剖面实测和测试的成果。将贵州遵义二叠系锰矿与华南古天然气渗漏沉积型锰矿床成矿理论进行详细对比,认为遵义锰矿总体是"内生外成",成锰物质主体来自地幔,遵义锰矿属"古天然气渗漏沉积型锰矿床",借鉴古天然气渗漏沉积型锰矿床的成矿理论和研究方法,运用遵义锰矿裂陷槽盆地结构的划分、同沉积断裂的识别和中心相、过渡相和边缘相判别标志,在断陷盆地中喷溢口及附近,发现矿石及其顶底板具有古天然气渗漏沉积型锰矿床独有的结构构造、同位素、生物组合等特征。研究认为遵义成锰盆地至少存在5个气液渗漏喷溢口,分布于Ⅲ级断陷盆地内,每一个喷溢口构成一个相对独立的气液渗漏喷溢沉积成矿系统,遵义锰矿床是形成由若干个气液渗漏喷溢沉积成矿子系统构成的沉积成矿系统。贵州遵义二叠纪锰矿成矿的气液渗漏喷溢口的发现,对遵义锰矿"内生外成"成因研究提供了宏观地质证据,为建立深部锰矿找矿预测模型提供了重要依据,为研究遵义锰矿的古天然气渗漏沉积型锰矿床成矿系统具有重要意义。     

黑龙江省张广才岭南部早侏罗世花岗岩暗色微粒包体成因研究

黑龙江省张广才岭南部早侏罗世花岗岩具有明显的岩浆混合特征。岩体中暗色微粒包体发育,主要为细粒闪长质岩浆包体,包体形态多样,与寄主岩呈截然、过渡关系。包体的矿物组合明显不平衡,如矿物具有定向排列的特点,斜长石发育自形环带并存在新、老两个世代,发育针状磷灰石。由电子探针对斜长石、角闪石和黑云母等矿物分析结果可知,寄主花岗岩和包体中各主要矿物含量基本一致。岩石地球化学特征研究显示,包体与寄主花岗岩关系密切,两者在稀土元素和微量元素方面也表现为明显的地球化学亲缘关系。这表明张广才岭南部早侏罗世花岗质岩石具有壳幔混合成因特征,暗色微粒包体是由较基性的地幔岩浆进入寄主岩浆中淬火结晶而成,花岗质岩浆的源区主要为新生的地壳物质。     

喀什凹陷中生代以来的构造事件对中-下侏罗统铀矿化的影响

喀什凹陷是我国西部重要的含铀区,自中生代以来主要发生过5次重大构造事件,对该地区中-下侏罗统铀矿成矿及保矿具有重要意义,即晚三叠世有利的构造背景,早-中侏罗世有利的构造-沉积环境形成的有利岩性-岩相建造,晚侏罗世构造掀斜与古层间氧化带及铀矿化的形成,白垩纪-古近纪的保矿作用及新近纪以来的构造破坏与局部层间氧化带的形成与叠加,从而很可能在中-下侏罗统中形成一定规模受层间氧化带控制的砂岩型铀矿床。指出主要找矿靶区为库孜贡苏断陷以西的南天山山前,同时还有托云盆地。     

福建建阳县虞墩剖面二叠纪腕足动物群

通过研究福建省建阳县虞墩剖面所采集的腕足动物化石,共获6属5种,2个未定种,其中Paracrurithyris pygmaea,Tethyochonetes quadrata和Acosarina minuta在虞墩剖面为首次报道。综合化石时代分布和区域对比,将该动物群的时代确定为晚二叠世长兴期,含该动物群的地层为大隆组,而非文笔山组或泉上组。通过对该腕足动物群的古生态分析,并结合该套地层的沉积特征,判断沉积环境为温暖条件下的浅海相。     

Sequence Stratigraphy of the Jurassic Coal Measures in Northwestern China

The sequence stratigraphy of the Jurassic coal measures of northwestern China has been studied based on data from outcrop and borehole sections. Because of the geological background and the diversity of basin types, such as isochronisms of coal seams and recognition of key sequence boundaries, it is rare to summarize and correlate sequence structure and framework. The types and recognition characteristics of the sequence boundaries of the Jurassic coal measures are revealed by comparing climatic characteristics, structural styles and the base level cycle. A total of five third-order sequences and 15 systems tracts have been subdivided and the sequence stratigraphic framework has been reconstructed confirming that the thick coals accumulated in the late stage of transgression system tracts of sequence I (SQ I) and sequence III (SQ III). This idea is of important academic significance for instructing coal resources exploration, and enhancing geological effects of prospecting engineering. It is also of practical significance for guaranteeing construction of the large-scale coal production base in northwestern China, accelerating the westward development of the coal industry stratagem.     

川东北上二叠统长兴组白云岩地球化学特征及形成机制

四川盆地东北部长兴组储集层主要由细—中晶白云岩组成,其次为微晶白云岩。根据薄片观察、阴极发光、电子探针分析发现,细—中晶白云岩与微晶白云岩在阴极发光特征方面很相似,都不发光,且在Mg、Ca、Fe、Mn、Sr和Ba含量方面也没有区别。根据上述分析结果认为,研究区的细—中晶白云岩是微晶白云岩在准同生期重结晶形成的,控制重结晶的主要因素是引起准同生白云石化的蒸发卤水下渗。这一认识为确定研究区白云岩储集层的空间分布提供了新的思路。