黔东震旦系—下寒武统黑色岩系稀土元素地球化学特征

：通过对黔东丹寨南皋剖面和三都渣拉沟剖面的稀土元素分析发现：两条剖面的梅树村期与筇竹寺期 分界处大量稀土元素明显富集,黑色页岩中存在明显的Ｃｅ负异常和Ｅｕ、Ｙ 正异常,表明为缺氧和热水沉积的产物。 这套黑色岩系总体沉积于缺氧和具热水注入的环境中,但发生缺氧和热水注入的时间和强度在不同地方会有不同 的表现。     

A New Vetulicolian from the Early Cambrian Chengjiang Fauna in Yunnan of China

The genus and species Yuyuanozoon magnificissimi gen. et sp. nov., a new fossil vetulicolian, is reported from the Early Cambrian Chengjiang Fauna in Yunnan of China. It has a bipartite body plan and five pairs of chain-formed gill sacs, showing the general characteristics of Ventulicolia. However, the exclusive "atrial cavity" and external gill observed indicate that the new form is different from those previously described as vetulicolians, probably representing a lineage developed within deuterostomes and more primitive than urochordates.     

Early Cambrian Mollusc Watsonella crosbyi: A Potential GSSP Index Fossil for the Base of the Cambrian Stage 2

The mollusc Watsonella crosbyi was studied on the basis of material from the lower Cambrian Dahai Member of the Zhujiaqing Formation in eastern Yunnan, China and the Pestrotsvet Formation of the Aldan River region in the Siberian Platform. This fossil had been excessively described under different names in the literature, such as Heraultia varensalensis Cobbold, 1935, H. sibirica Missarzhevsky, 1974, Heraultipegma yunnanensis He and Yang, 1982, H. yannanese He and Yang, 1982, Watsonella yunnanensis, W. crosbyi Grabau, 1900, etc. Taxonomic revision shows that other species are junior synonyms of W. crosbyi. Analysis of functional morphology implies that W. crosbyi may be rather a helcionelloid than a rostroconch since its univalved conch is untorted endogastric and lacks a rostrum and a true internal pegma. Replicas of the original microstructures preserved on the surfaces of phosphatic internal moulds confirm that the shell consists of two layers. The inner layer is lamello-fibrillar, and the outer layer is spherulitic prismatic. The widespread geographical occurrences in both siliciclastic and carbonate rocks of the late Terreneuvian indicate that W. crosbyi is an important index fossil for global correlations and subdivision of the Cambrian Series 1 (Terreneuvian). The first appearance datum (FAD) of W. crosbyi is suggested to be a potential GSSP (Global Boundary Stratotype Section and Point) candidate marker for defining the base of the Cambrian Stage 2.     

Organic Carbon Isotopic Evolution during the Ediacaran-Cambrian Transition Interval in Eastern Guizhou, South China： Paleoenvironmental and Stratigraphic Implications

Secular variations of carbon isotopic composition of organic carbon can be used in the study of global environmental variation, the carbon cycle, stratigraphic delimitation, and biological evolution, etc. Organic carbon isotopic analysis of the Nangao and Zhalagou sections in eastern Guizhou reveals a negative excursion near the Precambrian-Cambrian boundary that correlates with a distinct carbonate carbon isotopic negative excursion at this boundary globally. Our results also demonstrate that several alternating positive and negative shifts occur in the Meishucunian, and an obvious negative anomaly appears at the boundary between the Meishucunian and Qiongzhusian. The isotope values are stable in the middle and lower parts but became more positive in the upper part of the Qiongzhusian. Evolution of organic carbon isotopes from the two sections in the deepwater facies can be well correlated with that of the carbonate carbon isotopes from the section in the shallow water facies. Integrated with other stratigraphic tools, we can precisely establish a lower Cambrian stratigraphic framework from shallow shelf to deep basin of the Yangtze Platform.     

黔东前寒武纪-寒武纪转换时期微量元素地球化学特征研究

对黔东丹寨南皋剖面和三都渣拉沟剖面前寒武纪-寒武纪转换时期地层进行了系统的微量元素地球化学研究,结果表明:丹寨南皋剖面的Ba、Pb、Ni、Cu、Zn、Li、V、U等过渡元素和亲硫元素在多金属矿层和牛蹄塘组下部的黑色页岩中明显富集;三都剖面在相同层位也明显富集Cu、Pb、Rb、Ti、Ni、V、Th、Li、Cr、Zr、Sc等微量元素。南皋剖面的δU值和V/(Ni V)值表明老堡组硅质岩为正常海水的弱氧化环境下沉积物,而牛蹄塘组黑色页岩表现出缺氧环境的特征。三都渣拉沟剖面的δU值和V/(Ni V)值表明该剖面的还原条件比丹寨南皋剖面强,暗示着水体也较它深,为缺氧环境,其间在老堡组硅质岩中有两个短暂的充氧阶段,进入渣拉沟组缺氧环境较稳定。除丹寨老堡组硅质岩和三都渣拉沟组中上部钙质泥岩U/Th值小于1,表现出水成沉积岩的地球化学特征外,本次研究的两条剖面的其他黑色岩系的U/Th值都大于1,表现出明显的热水沉积岩的地球化学特征。从我们的研究剖面也可看出下寒武统牛蹄塘组底部的Ni-Mo矿多金属的Ni、V等金属的含量是上地壳的9～10倍之高,U高达近百倍,可作地层对比标志层,即梅树村阶的顶界标志。     

推行项目法施工促进勘察施工业的发展

阐述了项目法施工的基本原理，并针对我部中小型工程施工企业的现状，为最大限度提高施工企业的生产经营能力，促进我部勘察施工业的发展，提出了一些参考意见。     

新型水下监控器设计与可行性分析

反潜作战是世界难题,及早及时发现潜艇是反潜作战中至关重要的一步.水下预警系统是侦搜潜艇效率高、隐蔽性强的一种手段.针对水下预警系统侦搜潜性能不足、成本昂贵、布设不便等问题,提出了一款新型水下监控器构想,设计了基于此水下监控器的侦搜工作模式,讨论了新型水下监控器的指标要求,并分析了研制这种水下监控器的关键技术以及实现的可...     

Kaili Biota: A Taphonomic Window on Diversification of Metazoans from the Basal Middle Cambrian: Guizhou, China

1 Introduction The Burgess Shale Biota was discovered in the Cambrian strata of western Canada by American paleontologist C. D. Walcott in 1909 (Walcott, 1911). The fauna contains more than 140 metazoan genera (Robison, 1991, Briggs et al., 1994), with a preservational range from hard skeletal parts, non-mineralized remains and internal soft-tissue and soft-body remains. Following that discovery up to 40 similar taphonomic locations have been found globally in Lower and Middle Cambrian …     

扬子地台早寒武世古盘虫类的地层分布及其古地理控制?

早寒武世早期的黑色页岩系在扬子地台非常发育，但由于具有时代标志的化石稀少，这套黑色页岩系的层序问题一直未能很好解决。古盘虫类化石是早寒武世黑色页岩系中仅有的具有地层意义的化石类别,然而它们的分类混乱、层位不清，限制了其在地层对比中的应用。在古盘虫类分类重新厘定的基础上，通过对Tsunyidiscus 的4个种和Hupeidiscus orientalis地层分布的系统总结，认为T.aclis和T. armatus的层位限于筇竹寺早期，T. niutitangensis和T. tingi的层位主要是筇竹寺晚期，只有T. tingi延伸至沧浪铺早期。而H. orientalis在筇竹寺晚期开始出现，到沧浪铺早期繁盛。因此它们的层位分布特征可以用于地层学对比。通过对华南地区古盘虫类古地理分布和沉积相与环境分析，我们认为古盘虫类的分布受海平面升降、海水浑浊度、水深、含氧性等古海洋环境因素的控制： T. armats和T. aclis分布于近滨-远滨及外陆架上，适应水体平静，水动力能量较低，低沉积速率的相对较深的海域; T. tingi和T. niutitangensis在开阔的外陆架区域大量繁盛，T. niutitangensis生存在具有分层结构海洋的贫氧带和富氧带，海水较深，水体平静； 而H. orientalis在陆架边缘灰岩相中大量出现，适应于海水较深，水动力能量较低，浮游微生物丰富的洁净海水; 此外在粗碎屑岩、高碳质页岩、石煤发育的地层中无古盘虫类分布, 表明古盘虫类不适合海水动荡而混浊，沉积速率高的浅水高能环境和深水滞流缺氧的环境。