丹凤地区秦岭岩群片麻岩锆石U-Pb年龄:北秦岭地体中-新元古代岩浆作用和早古生代变质作用的记录

秦岭岩群被认为是出露于北秦岭地体内最古老的前寒武纪基底岩石,记录了北秦岭造山带的地壳形成和演化历史。本文报道丹凤-西峡地区五件秦岭岩群片麻岩锆石U-Pb年龄结果,限定其形成和变质时代,探讨北秦岭地体的构造归属。定年结果表明,岩浆成因锆石颗粒的年龄集中在1400～1600Ma左右和850～950Ma左右,记录两期主要岩浆活动。6粒锆石具有变质成因特征,低Th/U比值(0.03),206Pb/238U年龄变化在510～465Ma之间,加权平均值477±18Ma。这一古生代变质叠加时代与北秦岭地体南北缘高压变质作用时代基本一致,说明秦岭岩群遭受到北秦岭造山带俯冲-碰撞造山过程的变质作用。秦岭岩群主要形成于中元古代晚期至新元古代早期,基底岩石缺乏早元古代和太古代岩浆活动的记录。在岩浆作用时代上,北秦岭地体与广泛发育新元古代中-晚期岩浆作用的扬子陆块北缘有差别,也不同于晚太古代-早元古代的华北陆块南缘,可能是中-新元古代形成的独立微陆块。     

Synchrotron radiation and galactic field configurations

Models of the galactic magnetic field are discussed with respect to their influence on calculated contour maps as well as longitudinal distributions of the synchrotron brightness temperature. A comparison is made with Landecker-Wielebinski (1970) data.     

Electric Potential and Fréchet Derivatives for a Uniform Anisotropic Medium with a Tilted Axis of Symmetry

In this paper we develop analytic solutions for the electric potential, current density and Fréchet derivatives at any interior point within a 3-D transversely isotropic medium having a tilted axis of symmetry. The current electrode is assumed to be on the surface of the Earth and the plane of stratification given arbitrary strike and dip. Profiles can be computed for any azimuth. The equipotentials exhibit an elliptical pattern and are not orthogonal to the current density vectors, which are strongly angle dependent. Current density reaches its maximum value in a direction parallel to the longitudinal conductivity direction. Illustrative examples of the Fréchet derivatives are given for the 2.5-D problem, in which the profile is taken perpendicular to strike. All three derivatives of the Green’s function with respect to longitudinal conductivity, transverse resistivity and dip angle of the symmetry axis (dG/dσ_l, dG/dσ_t, dG/dθ₀) show a strongly asymmetric pattern compared to the isotropic case. The patterns are aligned in the direction of the tilt angle. Such sensitivity patterns are useful in real-time experimental design as well as in the fast inversion of resistivity data collected over an anisotropic earth.     

New brown dwarf companions to dM(e) stars

We present new astrometric and spectroscopic data to confirm two new M/L dwarf systems, G124‐62 and LHS5166, and discuss the nature of a third system (LP261‐75). Age and thus mass determinations of the L dwarf companions are discussed based on various activity‐age relationships of the M dwarf primaries. This publication will update the list of widely separated substellar companions to nearby stars. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

铜陵狮子山地区中酸性侵入岩锆石SHRIMP U-Pb定年及岩浆作用的深部过程

铜陵狮子山地区中酸性侵入岩锆石SHRIMP U-Pb定年结果表明,白茫山辉石二长闪长岩、鸡冠山和大团山石英二长闪长岩以及胡村花岗闪长岩的年龄分别为:138.21 ±0.82Ma、139.9 ±1.1Ma、139.3 ±1.2Ma和140.9 ±1.2Ma.岩浆侵位顺序为花岗闪长岩→石英二长闪长岩→辉石二长闪长岩.根据锆石SHRIMP U-Pb年龄变化范围,推测该区岩浆活动持续的时间约为15Ma,且岩浆属脉动式多次侵位,后期岩浆侵位的热使早期岩体中已结晶的锆石发生熔解、重结晶,形成新的锆石.地下深部岩浆活动频繁,形成了多级岩浆房,使得本区的莫霍面界线不明显.     

Geomagnetische Tiefentellurik Teil III: Die Geomagnetischen Variationen in Mittel- und Südost-Europa als Indikator der Streichrichtung grossräumiger elektrischer Untergrundstrukturen

Zusammenfassung Nach der im Teil II(²) geschilderten Methode wurde die Streichrichtung von regionalen elektrischen Leitfähigkeitsstrukturen des Untergrundes mit Hilfe erdmagnetischer Variationen an über 100 Orten in Mittel- und Südosteuropa kartenmäßig dargestellt. Die Untergrundsverhältnisse prägen die zeitlichen Variationen der magnetischen Vertikalfeldkomponente an vielen Orten in mittleren und niederen Breiten. Schon aus den Registrierungen eines einzigen Ortes kann man wichtige Schlüsse auf die Untergrundstrukturen ziehen, sofern die zeitlichen magnetischen Variationen der Vertikalkomponente gut ausgeprägt sind.

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Summary According to the method described in part II(²) the direction of regional electric sub-surface structures was evaluated at more than 100 points in Middle and SE-Europe by geomagnetic variations. The sub-surface conditions determine the time variations of the magnetic vertical component in middle and low latitudes to a great part. The evaluation of the registrations of a single place can give important results about the electric structures of the underground, as far as the time-variations of the vertical component are strongly marked.

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Mitteilung Nr. 151 des Geomagnetischen Instituts Potsdam.     

Geomagnetische Induktionspfeile in der ČSSR,Hervorgerufen durch Grossräumige Elektrische Leitfähigkeitsstrukturen

Резюме Значительные раэности электропроводности в горизонтальном направлении заставляют индуцируемые ионосферными временными вариациями электрические токи в подстиляющих слоях протекать по преимущественным направлениям. В статье представляются вызванные этим вариации вертикальной и горизонтальной составляющих для периодов 19–40 мун в 20 пунктах в ЧССР, где регистрировались магнитные вариации при помощи полевых регистрирующих станций.

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Mitteilung Nr. 194 des Geomagnetischen Instituts Potsdam.     

A recent history of metal accumulation in the sediments of the Thames Estuary, United Kingdom

Sediment cores were collected from the Tilbury Tidal Basin in the Thames Estuary to determine the depositional history of metals in the estuary. Profiles of metals in sediments deposited in the lower Thames Estuary show a 30–50% decrease in concentration for Ag, Cd, Cu, Pb, and Zn, and a 70% decrease for Hg in recent decades. Historic depth soundings data showed the decreases in metal concentrations occurred between 1944 and 1966. The decline in sediment metal concentrations has been attributed to reduced inputs to the estuary, following updating of the major sewage treatment works in 1959 and 1963. This is indicated by the through-core distribution of Mn which implies that prior to 1960 the sediments were deposited in anoxic conditions, which subsequently improved. An increase in Mn concentrations observed in one of the cores has been attributed to increases in the dissolved oxygen of the estuarine waters resulting from the increased efficiency of the sewage treatment works.     

Well-based hydraulic and geochemical monitoring of the above zone of the CO2 reservoir at Ketzin, Germany

In order to detect hydraulic and geochemical impact on the groundwater directly above the CO₂ storage reservoir at the Ketzin pilot site continuous monitoring using an observation well is carried out. The target depth (446 m below ground level, bgl.) of the well is the Exter formation (Upper Triassic, Rhaetian) which is the closest permeable stratigraphic overlying formation to the CO₂ storage reservoir (630–636 m bgl. at well location). The monitoring concept comprises evaluation of hydraulic conditions, temperature, water chemistry, gas geochemistry and δ¹³C values. This is achieved by a tubing inserted inside the well with installed pressure sensors and a U-tube sampling system so that pumping tests or additional wireline logging can be carried out simultaneously with monitoring. The aquifer was examined using a pump test. The observation well is hydraulically connected to the regional aquifer system and the permeability of about 1.8 D is comparatively high. Between Sept. 2011 and Oct. 2012, a pressure increase of 7.4 kPa is observed during monitoring under environmental conditions. Drilling was carried out with drilling mud on carbonate basis. The concentration of residual drilling mud decreases during the pump test, but all samples show a residual concentration of drilling mud. The formation fluid composition is recalculated with PHREEQC and is comparable to the literature values for the Exter formation. The gas partial pressure is below saturation at standard conditions and the composition is dominated by N₂ similar to the underlying storage reservoir prior to CO₂ injection. The impact of residual drilling mud on dissolved inorganic carbon and the respective δ¹³C values decreases during the monitoring period. The pristine isotopic composition cannot be determined due to calcite precipitation. No conclusive results indicate a leakage from the underlying CO₂ storage reservoir.     

The influence of relative humidity on the SO2 deposition velocity to building stones: a chamber study at very low SO2 concentration

We report on a chamber study to determine the influence of SO₂ concentration and relative humidity (RH) on the deposition velocity of SO₂ to a carbonaceous sandstone (Ihrlerstein sandstone) and to two silicate sandstones (Sand sandstone and Obernkirchen sandstone). Two different chambers were used, one operated at constant inlet SO₂ concentration, the other one at constant outlet concentration. Measurements were carried out at realistically low SO₂ concentrations ranging from 15 ppb to 200 ppb. The relative humidity was varied from 45 to 95 %. The measurements confirm a strong influence of concentration on the deposition velocity for all stones investigated. This concentration dependence can be represented using a very simple model with only one rate constant as the only adjustable parameter. A significant influence of the relative humidity on the deposition velocity to the carbonaceous stone is also observed. In contrast, the deposition velocity to the silicate stones is independent of RH. It is demonstrated that the combined influences of concentration and RH on the deposition velocity can be only correctly determined in chambers with constant outlet concentration.