Геология России: Recent submissions

Now showing items 121-140 of 43139

CRYSTAL STRUCTURES OF SULFIDES AND OTHER CHALCOGENIDES

Makovicky E. (2006)

In this chapter, the crystal structures of sulfides and related chalcogenide compounds (involving Se, Te, As and Sb as well as S) are reviewed with emphasis on mineral phases but with some discussion of related synthetic ...
GEOCHEMICAL AND MINERALOGICAL DISTRIBUTION OF GERMANIUM IN THE KHUSIB SPRINGS CU-ZN-PB-AG SULFIDE DEPOSIT, OTAVI MOUNTAIN LAND, NAMIBIA

Melcher F.; Oberthür T.; Rammlmair D. (2006)

The Khusib Springs deposit in the Otavi Mountain Land, Namibia, is a small though high-grade carbonate-hosted Cu-Zn-Pb-Ag-(As-Sb-Ge) deposit of the "Tsumeb-type" containing approximately 300,000 t of ore grading 10% Cu, ...
CATAMARCAITE, CU6GEWS8, A NEW GERMANIUM SULFIDE MINERAL SPECIES FROM CAPILLITAS, CATAMARCA, ARGENTINA: DESCRIPTION, PARAGENESIS AND CRYSTAL STRUCTURE

Putz H.; Paar W.H.; Topa D.; Makovicky E.; Roberts A.C. (2006)

Catamarcaite, ideally Cu6GeWS8, was discovered in bornite-rich ore from old dumps near the La Rosario vein, Capillitas epithermal deposit, Catamarca Province, Argentina. The new mineral is associated with bornite, digenite, ...
PHOTIC ZONE PALAEOENVIRONMENTS OF THE KIMMERIDGE CLAY FORMATION (UPPER JURASSIC, UK) SUGGESTED BY CALCAREOUS NANNOPLANKTON PALAEOECOLOGY

Lees J.A.; Bown P.R.; Young J.R. (2006)

Nannoplankton abundance data has revealed significant and systematic population fluxes through all representative lithologies and cycle types of the Kimmeridge Clay Formation (KCF), and also through intervals in which ...
PALAEOENVIRONMENTAL CHANGES AT THE FRASNIAN/FAMENNIAN BOUNDARY IN KEY EUROPEAN SECTIONS: CHEMOSTRATIGRAPHIC CONSTRAINTS

Pujol F.; Berner Z.; Stüben D. (2006)

The study aims to put constraints on global environmental changes, which took place during the Frasnian-Famennian (F/F) transition by using a geochemical multiproxy approach. For this several key European F/F boundary ...
VEGETATION BURIED UNDER DAWSON TEPHRA (25,300 14C YEARS BP) AND LOCALLY DIVERSE LATE PLEISTOCENE PALEOENVIRONMENTS OF GOLDBOTTOM CREEK, YUKON, CANADA

Zazula G.D.; Mathewes R.W.; Froese D.G.; Reyes A.V.; Elias S.A.; Kuzmina S.; La Farge C.; Sanborn P.T.; Schweger C.E.; Scott Smith C.A. (2006)

Paleoecological research at Goldbottom Creek in the Klondike region of Yukon Territory (NW Canada) documents an in situ riparian grassy meadow that was buried during the winter or early spring by Dawson tephra, near the ...
ASSEMBLAGE PALAEOECOLOGY OF THE EDIACARA BIOTA: THE UNABRIDGED EDITION?

Droser M.L.; Gehling J.G.; Jensen S.R. (2006)

Fossils of the Ediacara biota offer our earliest insight into diverse macroscopic life on this planet. In particular, given the diversity and range of exquisite soft-bodied preservation, the potential for unraveling aspects ...
CRUSTAL MOTION AND STRAIN ACCUMULATION IN WESTERN BULGARIA

Kotzev V.; Nakov R.; Georgiev Tz.; Burchfiel B.C.; King R.W. (2006)

Global Positioning System (GPS) data acquired between 1996 and 2004 and fault plane solutions for four seismic zones are analyzed to obtain the velocity and strain rate fields for western Bulgaria. The GPS derived velocities ...
MOLAR TOOTH STRUCTURES OF THE NEOARCHEAN MONTEVILLE FORMATION, TRANSVAAL SUPERGROUP, SOUTH AFRICA. I: CONSTRAINTS ON MICROCRYSTALLINE CACO3 PRECIPITATION

Bishop J.W.; Sumner D.Y. (2006)

Molar tooth (MT) structures are enigmatic, contorted millimetre- to decimetre-long veins and spheroids of microcrystalline calcite that formed during very early diagenesis in Precambrian sediments. MT structures in the ca ...
WATER IN NOMINALLLY ANHYDROUS CRUSTAL MINERALS: SPECIATION, CONCENTRATION, AND GEOLOGIC SIGNIFICANCE

Johnson E.A. (2006)

Why should we be interested in trace hydrous species in nominally anhydrous minerals in the Earth’s crust? After all, hydrous minerals dominate the pedosphere and are abundant to fairly common trace minerals in many ...
HYDROGEN IN HIGH PRESSURE SILICATE AND OXIDE MINERAL STRUCTURES

Smyth J.R. (2006)

Earth is the water planet. Liquid water covers more than 70% of the surface and dominates all surface processes, geological, meteorological, and biological. However the hydrosphere composes only about 0.025% of the planet’s ...
MOLAR TOOTH STRUCTURES OF THE NEOARCHEAN MONTEVILLE FORMATION, TRANSVAAL SUPERGROUP, SOUTH AFRICA. II: A WAVE-INDUCED FLUID FLOW MODEL

Bishop J.W.; Sumner D.Y.; Huerta N.J. (2006)

Sedimentological, morphological, and geochemical characteristics of molar tooth (MT) structures in the ca 2·6Ga Monteville Formation suggest a new fluid flow model for MT formation: (i) intercalated shales and carbonate ...
LA-ICP-MS U-PB ZIRCON GEOCHRONOLOGY OF THE NEOPROTEROZOIC IGNEOUS ROCKS FROM NORTHERN GUANGXI, SOUTH CHINA: IMPLICATIONS FOR TECTONIC EVOLUTION

Wang X.-L.; Zhou J.-C.; Qiu J.-S.; Zhang W.-L.; Liu X.-M.; Zhang G.-L. (2006)

The western end of the Proterozoic Jiangnan orogen is located at the Northern Guangxi, South China. Neoproterozoic granitoids are dominant (>90%) in the area, with ca. 8% being the mafic-ultramafic rocks. The generation ...
HYDROCARBON SEEP AND HYDROTHERMAL VENT PALEOENVIRONMENTS AND PALEONTOLOGY: PAST DEVELOPMENTS AND FUTURE RESEARCH DIRECTIONS

Campbell K.A. (2006)

Hydrocarbon seeps and hydrothermal vents are now known to be common at continental margins and oceanic spreading centers worldwide, exuding fluids rich in CH4 and H2S, and teeming with life based on chemosynthesis. These ...
EXHUMATION OF BASEMENT-CORED UPLIFTS: EXAMPLE OF THE KYRGYZ RANGE QUANTIFIED WITH APATITE FISSION TRACK THERMOCHRONOLGY

Sobel E.R.; Oskin M.; Burbank D.; Mikolaichuk A. (2006)

The Kyrgyz Range, the northernmost portion of the Kyrgyzstan Tien Shan, displays topographic evidence for lateral propagation of surface uplift and exhumation. The highest, most deeply dissected segment lies in the center ...
ABIOGENIC ORIGIN OF HYDROCARBONS: AN HISTORICAL OVERVIEW

Glasby G.P. (2006)

The two theories of abiogenic formation of hydrocarbons, the Russian-Ukrainian theory of deep, abiotic petroleum origins and Thomas Gold's deep gas theory, have been considered in some detail. Whilst the Russian-Ukrainian ...
AN INVESTIGATION OF UPPER MANTLE HETEROGENEITY BENEATH THE ARCHAEAN AND PROTEROZOIC CRUST OF WESTERN CANADA FROM LITHOPROBE CONTROLLED-SOURCE SEISMIC EXPERIMENTS

Gorman A.R.; Németh B.; Clowes R.M.; Hajnal Z. (2006)

Observations of upper mantle reflectivity at numerous locations around the world have been linked to the presence of a heterogeneous distribution of rock types within a broad layer of the upper mantle. This phenomenon is ...
RECONSTRUCTION OF MEGALAKE CHAD USING SHUTTLE RADAR TOPOGRAPHIC MISSION DATA

Leblanc M.; Favreau G.; Leduc C.; Delclaux F.; Lemoalle J.; Maley J.; Nazoumou Y.; Stagnitti F.; van Oevelen P.J. (2006)

In the 2,500,000 km2 Lake Chad Basin in central Africa, the 2000 Shuttle Radar Topographic Mission (SRTM) data have been used to supplement the existing topographic data. SRTM data produce much sharper images of the region's ...
EAST-ASIAN MONSOON VARIABILITY BETWEEN 15 000 AND 2000 CAL. YR BP RECORDED IN VARVED SEDIMENTS OF LAKE SIHAILONGWAN (NORTHEASTERN CHINA, LONG GANG VOLCANIC FIELD)

Schettler G.; Mingram J.; Dulski P.; Liu Q.; Stebich M. (2006)

A palaeohydrological reconstruction on decadal scale for the period 15000-2000 cal. yr BP based on calculated net accumulation rates for biogenic silica (F-bSiO2) and additional proxies (sedimentological data, geochemical ...
THE HETEROGENEOUS UPPER MANTLE LOW VELOCITY ZONE

Thybo H. (2006)

The upper mantle low velocity zone (LVZ) is a depth interval with slightly reduced seismic velocity compared to the surrounding depth intervals. The zone is present below a relatively constant depth of 100 km in most ...

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