Harts Range地区的“毛虫构造”:澳大利亚中部东Arunta内露层中两个连续元古宙拉伸—碰撞造山带的亲缘关系

我们认为在澳大处亚中部Aranta内露层的Harts Range地区,原先我们描述的基底和盖层之间的关系,实际上代表了早中元古宙褶皱带,即Strangways造山带(SOB)与较年轻的中元古宙造山带,即Harts Range造山带之间一个厚的复杂变形接触带,这两个造山带都含有各自的表壳岩序列。SOB岩石在地壳拉伸的早期阶段,大约1800Ma时沉积,并可能遭受了麻粒岩相的最高级变质作用,它们接着被大量的1767Ma酸性岩浆侵入,并且被挤压形成一个具有特色的NNE-SSW走向的造山带。在NNE-SSW地壳拉伸阶段,形成了一个NWW-SEE走向向北缓倾斜的强烈多次重复变形带,命名为Harts Ranga拆离带(HRDZ),它是SOB基底岩石中一个主要的低角度正剪切/拆离带,而且与基底岩石走向呈高角度相交。自从HRDZ形成之后,就做为地壳的一个薄弱带断断续续地活动。这个带上的首次拉伸运动开始于Harts Range活动带(HRMB)的形成,HRMB表现出许多由现代板块运动引起的构造带特征。表壳岩盖层序列,即Harts Range盖层(HRC),形成在HRDZ上盘沉降产生的主要地槽盆地内。在运动方向发生根本变化导致地壳收缩和与碰撞作吼有关的逆冲作用阶段开始之前,地壳的连续拉伸使盖层和麻粒岩相的基底并置,随后盖层发生角闪岩相最高级变质作用。HRMB包括HRDZ和HRC,Harts Range造山作用(HRO)期间,在大量花岗质岩浆主要沿HRDZ侵入之前,HRMB在一个相对非常短的时间内(15～20Ma)内部就发生了变形作用。这些1747Ma侵入的花岗岩类侵入体精确地确定了HRO早期阶段演化的时间尺度。HRO作为一种地壳收缩的特殊造山形式在文献中被详细的阐述,这种造山形式主要是通过与HRDZ伴生的断层和剪切带上发生反向不连续的逆冲及剪切作用来完成的。HRDZ的位移是一个粘带滑动过程,由于向南部依次各点上的牵制作用,使逆冲滑移运动重复间断,间断的每个周期后都发生不连续冲断层的、HRDZ中捕获的基底岩片的和上覆表壳岩序列的褶皱作用。每个不连续运动阶段和褶皱幕都单独给予了命名和描逆,这可以做为元古宙构造活动的非同一般类型的模式。     

Looking for the most "primitive" organism(s) on Earth today: the state of the art

Molecular phylogenetic studies have revealed a tripartite division of the living world into two procaryotic groups, Bacteria and Archaea, and one eucaryotic group, Eucarya. Which group is the most "primitive"? Which groups are sister? The answer to these questions would help to delineate the characters of the last common ancestor to all living beings, as a first step to reconstruct the earliest periods of biological evolution on Earth. The current "Procaryotic dogma" claims that procaryotes are primitive. Since the ancestor of Archaea was most probably a hyperthermophile, and since bacteria too might have originated from hyperthermophiles, the procaryotic dogma has been recently connected to the hot origin of life hypothesis. However, the notion that present-day hyperthermophiles are primitive has been challenged by recent findings, in these unique microorganisms, of very elaborate adaptative devices for life at high temperature. Accordingly, I discuss here alternative hypotheses that challenge the procaryotic dogma, such as the idea of a universal ancestor with molecular features in between those of eucaryotes and procaryotes, or the origin of procaryotes via thermophilic adaptation. Clearly, major evolutionary questions about early cellular evolution on Earth remain to be settled before we can speculate with confidence about which kinds of life might have appeared on other planets.     

Public housing and migration: a multi-level modelling approach

"This paper...[analyzes] the distance moved by one-year migrants using a multi-level modelling approach. Controlling for a range of socio-economic variables, derived from the 1991 British Census Sample of Anonymised Records (SAR), at both the individual and area level, the distance moved by household heads in public, privately rented and owner-occupied housing within Britain is assessed.... It is confirmed that migrants in public housing are less likely to migrate long distances than owner-occupiers and that the proportion of public housing in a SAR area, and the absolute reduction in public housing in a SAR area between 1981 and 1991, does not have a significant effect on the distance that in-migrants have moved."     

THE ADVERSE IMPACT OF HUMAN ACTIVITIES ON FLOOD CONTROL IN THE HUAIHE BASIN

LIN~DUCnONTheHuaiheBasinislOCatedbetWeen31"-36"llorthemlahtudeand112"-121"easternlongitude,andcoversatotalareaofabout269,000sq.kin,OfwhichthemountainousandhillyareasocCUPyl/3,theplainsandlow-iringland2/3.ThebasinelicitSsalientphysicalgeographicalfeatllTesasfollowsf(l)Thereisnoobviousmountaindividebe~ntheWatershedoftheriVerandtheYellowforerBasinaswellastheYangtZeRadBasin.MostofthetributariesinthenoalbudoftheHuaiheforertakethesouthdikesOftheYellowherasthedivide.(2)TheriVerbedofthetr…     

Study of annual mass balance(2011–2013) of Rikha Samba Glacier,Hidden Valley,Mustang, Nepal

Although Himalayan glaciers are of particular interest in terms of future water supplies, regional climate changes, and sea-level rises, little is known about them due to lack of reliable and consistent data. There is a need for monitoring these glaciers to bridge this knowledge gap and to provide field measurements necessary to calibrate and validate the results from different remote sensing operations. Therefore, glaciological observations have been carried out by the Cryosphere Monitoring Project(CMP) since September 2011 on Rikha Samba Glacier in Hidden valley, Mustang district in western Nepal in order to study its annual mass balance. This paper presents the first results of that study. There are 10 glaciers in Hidden Valley, named G1, G2, G3, up to G10. Of these, G5 is the Rikha Samba Glacier, which has the largest area(5.37 km2) in this valley and the highest and lowest altitudes(6,476 and 5,392 m a.s.l., respectively). The glacier mass balance discussed in this paper was calculated using the glaciological method and the equilibrium line altitude(ELA). The glacier showed a negative annual point mass balance along the longitudinal profile of its lower part from September 10, 2011 to October 3, 2012. Stake measurements from October 4, 2012 to September 30, 2013 indicated a negative areal average of annual mass balance-0.088±0.019 m w.e. for the whole glacier. Based on these observations, the ELA of the Rikha Samba Glacier is estimated at 5,800 m a.s.l. in 2013. This negative balance may be due to rising air temperatures in the region, which have been incrementally rising since 1980 accompanied by little or no significant increase in precipitation in that period. The negative mass balance confirms the general shrinking trend of the glacier.     

Proterozoic Dyke Swarms of the Siberian Craton and Their Geodynamic Implications

正We present a summary of late Paleoproterozoic to Neoproterozoic mafic magmatism in the Siberian craton which allows us distinguish following main pulses of mafic dyke emplacement:1)1860–1850 Ma mafic dykes are localized within the     

Role of Multi-Generation Dyke Emplacements in Moyar-Bhavani Shear Zone,South India

正The Moyar-Bhavani Shear Zone(MBSZ)of the South Indian Granulite Terrain(SIGT),a complex continental block formed by the accretion of various crustal units during the Archaean to Neoproterozoic,bear evidences of     

使用威斯特波克射电望远镜对古代东方“客星”射电遗迹的探测

作者使用威斯特波克射电望远镜在610兆赫频率上对古代东方天文学家观测到的“客星”的七个视场区(1~o.5×1~o.5)进行了射电遗迹的巡天探测,结果没有发现弥漫射电辐射。本文给出了在这些视场区中的分立射电源的表,表中列出作者提出的这些射电源|b|<15°以內的光学证认。     

ON AN ENIGMATIC PTEROPOD-LIKE FOSSIL FROM THE LOWER CAMBRIAN OF SOUTHERN SHANSI,BICONULITES GRABAUI,NOV.GEN.,NOV.SP.

Ⅰ. GEOLOGY OF THE SITE The Lower Cambrian fossils here described were first found, insufficiently preserved, by Licent and Teilhard in 1926 at K(?)ntingshih (圪丁石), just along the border of the high limestone range, 50 lis N. of Cbishanhsien (S. Shansi).