A New Eusauropod Dinosaur from the Lower Cretaceous of Guangxi Province, Southern China

<正>A new sauropod dinosaur,Liubangosaurus hei gen.et sp.nov.,is erected based on a specimen represented by five articulated middle-caudal dorsal vertebrae,which was discovered in the Lower Cretaceous Napai Formation of Guangxi Province,southern China.This new taxon is diagnosed by a unique combination of derived features:prezygapophysis closely contacts with parapophysis,with the prdl and prpl absent;presence of cavity on the dorsal surface of the diapophysis;neural spine very low,with its distal end level with that of diapophysis;distal end of the neural spine strongly expanded laterally to form a platform;marked fossa formed between the infradiapophyseal lamina and the parapophysis;broad,flat area of featureless bone on lateral surface of neural arch;vertically directed infradiapophyseal lamina expands or bifurcates ventrally to form a inverted "Y";highly positioned parapophyses large and tear-drop in shape.The discovery of this new taxon increases the diversity of sauropods in China during the Early Cretaceous.     

A Megatheropod Tooth from the Early Cretaceous of Fusui,Guangxi, Southern China

A nearly complete right maxillary or left dentary tooth（NHMG 10858） from the Lower Cretaceous Xinlong Formation of the Napai Basin, Fusui County, Guangxi, southern China, is described. The tooth is large in size, with a CBL of 37 mm. Given the geological age and its crown morphology, including the size, it is most likely that the tooth belongs to a carcharodontosaurid. The recovered specimen represents one of the largest theropod teeth hitherto reported from the Early Cretaceous of Asia.     

桐柏-大别造山带剪切带阵列的构造岩研究

桐柏—大别造山带剪切带阵列经受长期的应变软化、应变局部化和变形分解作用,形成了一系列构造岩,包括糜棱岩、变晶糜棱岩、半塑性糜棱岩和面理化碎裂岩等。糜棱岩普遍具二相糜棱结构或由相连的弱相基质或层分离强相残斑或布丁所形成的IWL(Interconnected weak matrix or layers)结构。构造岩中显微构造各式各样,并具一定的组合形式和演化规律,反映了不同环境下主导变形机制的多样性及变形机制间转换的规律性。代表性剪切带岩石化学成分变异的研究表明,除流体流动外,体积亏损是造成某些组分,尤其是一些不活动组分,如钛、磷、锆、钒、钇等相对富集的主导因素,并由化学成分的变异和质量平衡计算,求出了该剪切带的体积亏损率以及流体/岩石值。较大的体积亏损和大量渗透体的存在,对剪切带的化学行为和流变行为都有着重要的影响作用。     

滇中大红山岩群变质火山岩类的原岩性质和构造属性

大红山岩群中的变质火山岩类经在了区域性的海水蚀变和区域变质的改造,其岩石学特征和化学成分都发生了较大的变化,不活动组分的研究显示,其原岩主查拉斑玄武岩类,且具有形成于洋中脊环境的地球化学特征,可能属于Ｔ型地幔源区的洋中脊玄武岩（ＭＯＲＢ）大红山式Ｃｕ－Ｆｅ矿床具有富洋壳成矿元素特性,与所识别的变质火山岩类的原岩和形成的大地构造背景是一致的。     

碰撞造山过程中热—构造状态演化与陆壳岩石熔融的关系

碰撞造山作用过程中陆壳岩石熔融形成花岗岩浆主要出现在加热期和伸展抬升期，是碰撞后岩石圈热状态调整引起陆壳物质化学分异的结果。陆壳碰撞前的构造历史，大陆岩石圈的热参数和地幔过程，造山带的几何学特征和运动学性质等制约了造山带花岗岩类的发育，尤其是与各种造成地幔高热流叠加于下部地壳的岩石调整过程关系密切。     

Magmatism and Genesis of the Beiya Giant Gold-Polymetallic Deposit, SW China

Please refer to the attachment(s) for more details.     

大别超高压变质带流体包裹体的组台关系与演变

对大别超高压变质带主要构造单元各类地质体岩石中的流体包裹体进行了岩相学和相变温度的观察与测定。流体包裹体类型和成分特征显示，与超高压变质、早期退变质有关的流体成分主要属于盐—H2O体系，减压熔融释放的流体成分主要属于NaCl—CO2—H2O体系，脆性变形期间涉及的成分流体主要属于NaCl—H2O体系。由于超高压变质岩系的快速折返抬升造成的压力迅速降低等影响，各个事件中形成的流体包裹体都发生了程度不同的颈缩及爆裂等捕获后变化，其密度大都已不能反映捕获时的状态。超高压变质和退变质岩石中常常叠加了与不同流体事件有关的流体包裹体组合，因此，对群体制样获得的各种化学成分和同位素成分等数据所做的各种地质解释风险较大。