Limited modification of mid-latitude landscapes by ice sheets: The case of northeast Scotland   总被引：1，自引：0，他引：1  

Adrian M. Hall  David E. Sugden 《地球表面变化过程与地形》1987,12(5):531-542

The paper uses a case study in Scotland to examine the amount and processes of landscape modification by Quaternary ice sheets. There is an inverse correlation between the distribution of landforms of glacial erosion and pre-glacial landscape remnants in northeast Scotland. The implication is that in places ice sheets can preserve a pre-glacial landscape unscathed, while elsewhere they remove the pre-glacial weathered rock. The location of glacial protection or erosion is strongly influenced by the topography and its influence on former ice sheet flow and basal thermal regime. The classic glacially eroded landscape of areal scouring can be produced by the removal of only 10–50 m of weathered rock. Furthermore rock basins, often regarded as the hallmark of glacial erosion, may be directly inherited from the pre-glacial pattern of deep weathering.  相似文献   

Slump blocks, intraformational conglomerates and associated erosional structures in Pennsylvanian fluvial strata of eastern Canada   总被引：2，自引：0，他引：2  

H. W. VAN DE  POLLI. M. PATEL 《Sedimentology》1989,36(1):137-145

  相似文献   

Significance of MORB-derived Amphibolites from the Aracena Metamorphic Belt, Southwest Spain   总被引：2，自引：0，他引：2  

CASTRO  ANTONIO; FERNANDEZ  CARLOS; DE LA ROSA  JESUS D.; MORENO-VENTAS  IAKI; ROGERS  GRAEME 《Journal of Petrology》1996,37(2):235-260

The Aracena metamorphic belt, in the southwest Iberian Massif,is characterized by the presence of MORB-derived amphibolitesand continental rocks deformed and metamorphosed during theHercynian orogeny. Geochemical relationships of these amphibolitesindicate the existence of a multiple fractionation process froma set of parental magmas, implying the existence of a multi-chambersystem beneath the ridge where the basalt protolith was extruded.Neodymium isotopic ratios are typical of MORB, and oxygen isotopesindicate that these amphibolites have been derived from theuppermost part of the oceanic crust. Thermal evolution, revealedfrom the study of chemical variations in the amphibole chemistry,is interpreted as resulting from subduction in a low-pressureregime in which the thermal structure of the continental hanging-wallplayed an important role. This continental wall was previouslyheated by subduction of a slab window resulting from migrationof a triple junction along the continental edge during plateconvergence. Three petrologic arguments support this tectonicmodel. These are: (1) the low-pressure inverted metamorphicgradient of amphibolites of the oceanic domain; (2) the high-temperature-low-pressure metamorphism of the continental hanging wall; (3)the early intrusion of boninites into the continental domain. ^*Corresponding author.  相似文献   

Study　on　the　feature　selection　and　classifica－tion　effect　of　precursory　data　of　ground　tilt     

李正媛  吴奕麟  李晓军 《地震学报(英文版)》1996,9(4):605-610

Ｓｔｕｄｙｏｎｔｈｅｆｅａｔｕｒｅｓｅｌｅｃｔｉｏｎａｎｄｃｌａｓｓｉｆｉｃａ┐ｔｉｏｎｅｆｅｃｔｏｆｐｒｅｃｕｒｓｏｒｙｄａｔａｏｆｇｒｏｕｎｄｔｉｌｔＺＨＥＮＧ－ＹＵＡＮＬＩ（李正媛），ＤＥ－ＦＵＣＨＥＮ（陈德福），ＹＩ－ＬＩＮＷＵ（吴奕麟）ａ...  相似文献   

Characteristics of fault rocks and paleo-earthquake source along the Koktokay-Ertai fault zone,Xinjiang,China     

史兰斌  林传勇  陈孝德  张小鸥  柏美祥 《地震学报(英文版)》1997,10(3):365-373

ＣｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆｆａｕｌｔｒｏｃｋｓａｎｄｐａｌｅｏｅａｒｔｈｑｕａｋｅｓｏｕｒｃｅａｌｏｎｇｔｈｅＫｏｋｔｏｋａｙＥｒｔａｉｆａｕｌｔｚｏｎｅ，Ｘｉｎｊｉａｎｇ，ＣｈｉｎａＬＡＮＢＩＮＳＨＩ１）（史兰斌）ＣＨＵＡＮＹＯＮ...  相似文献   

TRACING FLOOD FLOWS USING SEDIMENTARY INDICATORS     

Carmen DE JONG Habilitation fellow of the Deutsche Bundesstiftung Umwelt  B.E.R.G. 《国际泥沙研究》1997,(3)

LinTRODUCTIONANDAIMSTheaimsofthisStUdyaretointroducenewtechniquesforanalysingfloodflowsfromsedimentarrangementmsapproachincorporatestheeffectsofflotvonthedevelopmentofrouglmessontheriverbed,andnot,asismostlythecase,theeffectsofbedroughnessonflow.Differentacsofflows,includingthemaalmumfloodflowarereconsmictedfromfloworientahonsofparticlesoveranentiregravCIbar.DuetOtheddricultiesinvolvedinobtaininglargeparticlesamples,studiesonpAncleOrientationsintheliteratUrearerare.WhilstmoStanalyse…  相似文献   

A kind of informationon short-term and imminent earthquake precursors-research on atmospheric electric field anomalies before earthquakes     

郝建国  唐天明  李德瑞 《地震学报(英文版)》1998,(1)

Ａｋｉｎｄｏｆｉｎｆｏｒｍａｔｉｏｎｏｎｓｈｏｒｔｔｅｒｍａｎｄｉｍｍｉｎｅｎｔｅａｒｔｈｑｕａｋｅｐｒｅｃｕｒｓｏｒｓ—ｒｅｓｅａｒｃｈｏｎａｔｍｏｓｐｈｅｒｉｃｅｌｅｃｔｒｉｃｆｉｅｌｄａｎｏｍａｌｉｅｓｂｅｆｏｒｅｅａｒｔｈｑｕａｋｅｓＪＩ...  相似文献   

SUR LA CRISTALLINITÉ DE L'ILLITE DANS LA DIAGENÈSE ET L'ANCHIMÉTAMORPHISME     

G. DUNOYER DE  SEGONZAC J. FERRERO  B. KUBLER 《Sedimentology》1968,10(2):137-143

On the crystallinity of illite in diagenesis and anchimetamorphism A simple method to estimate the degree of “crystallinity” of illite has been used for several years in three French laboratories. Many results, which are unpublished, were obtained; three examples are presented in this paper. They show the sensibility of the method, which allows one to appreciate, above all other methods, burial diagenesis, the front of metamorphism, or some regional areas of very weak metamorphism.  相似文献   

Notes on Continental Geology     

P.TEILHARD DE CHARDIN 《地质学报》1937,(Z1)

Over a continental area, the sediments are mostly found, either asoriginally spread by water along the slopes (gravels or loams: fan-deposits), or as accumulated by streams in the bottom of the basins(lake-deposits, or fluvial plains), either as disseminated by wind (sand-dunes and loess deposits).  相似文献   

HOW AND WHERE TO SEARCH THE OLDEST MAN IN CHINA.     

P.TEILHARD DE CHARDIN 《地质学报》1926,5(3)

During the summer of 1923, we were so lucky F. Licent and myself as to get, in three different places, the first records of the palaeolithic Man in China.  相似文献