Geochemical and Isotopic (O, Nd, Pb and Sr) Constraints on A-type Granite Petrogenesis Based on the Topsails Igneous Suite, Newfoundland Appalachians   总被引：24，自引：2，他引：22  

WHALEN  JOSEPH. B.; JENNER  GEORGE A.; LONGSTAFFE  FREDERICK J.; ROBERT  FRANCINE; GARIPY  CLMENT 《Journal of Petrology》1996,37(6):1463-1489

The voluminous, bimodal, Silurian Topsails igneous suite consistsmainly of ‘A-type’ peralkaline to slightly peraluminous,hypersohnis to subsolvus granites with subordinate syenite,onzonite and diabase, plus consanguineous basalts and highsilicarhyolites. _Nd(T) values from the suite range from –1.5to +5.4; most granitoid components exhibit positive _Nd(T) values(+1.1 to +3.9). Granitoid initial ⁸⁷Sr/⁸⁶Sr and most ¹⁸ O valuesare in the range expected for rocks derived from mantle-likeprotoliths (0.701–0.706 and +6 to +80/). Restricted ²⁰⁷Pb/²⁰⁴Pbvariation is accompanied by significant dispersion of ²⁰⁶Pb/²⁰⁴Pband ²⁰⁸Pb/²⁰⁴Pb. Superficially, petrogenesis by either direct(via fractionation from basalt) or indirect (via melting ofjuvenile crust) derivation from mantle sources appears plausible.Remelting of the granulitic protolith of Ordovician are-typegranitoids can be ruled out, because these rocks exhibit negative_Nd(T) and a large range in ²⁰⁷Pb/²⁰⁴Pb. Geochemical and isotopicrelationships are most compatible with remelting of hybridizedlithospheric mantle generated during arc-continent collision.A genetic link is suggested among collision-related delaminationor slab break-off events and emplacement of ‘post-erogenic’granite suites. A-type granites may recycle previously subductedcontinental material, and help explain the mass balance notedfor modern arcs. However, they need not represent net, new,crustal growth. KEY WORDS: A-type granites; juvenile crust; isotopes; Newfoundland ^*Telephone: (613) 995-4972. Fax: (613) 995-7997. e-mail: jwhalen{at}gsc.emr.ca  相似文献   

Minor-element and Revised Major-element Contents of Some Mediterranean Pantellerites and Comendites     

NOBLE  DONALD C.; HAFFTY  JOSEPH 《Journal of Petrology》1969,10(3):502-509

Optical emission spectrographic analysis of three pantelleritesfrom Pantelleria and two comendites from Sardinia show highconcentrations of B, Be, Ga, La, Mo, Nb, Sn, Y, Yb, and Zt andlow contents of Ba, Co, Cr, Ni, Sr, and V. Minor-element trendsof these specimens are very similar to those of pantelleritesfrom southern Nevada and New Zealand and other peralkaline silicicrocks from various localities. Fluorine contents of the Pantellerianspecimens range from 0.19 to 0.32 per cent by weight resultingin abnormally high Cl to F ratios. New analyses for MgO, Na₂O,and K₂O are almost identical with the values obtained by Zies.Revised major-element compositions and calculated glass-phasecompositions for the three Pantellerian specimens are given.  相似文献   

首次在中国发现的矿物   总被引：2，自引：0，他引：2  

约瑟夫.阿.曼德伦诺  傅小土 《矿物学报》2005,25(3):217-229

本文主要内容是根据作者近期发表在英文杂志《岩石与矿物》上的同名文章译成的,它追述了在中国发现的新矿物种（类）的基本历史。列出了在中华人民共和国发现的99种矿物的名字及其发现地点和文献出处。本文修正了英语文献中的大量错误,从语言学角度介绍了矿物学在英文和中文交流之间存在的困难。作者为中文稿增加了一些新内容,更新了几处发现地的资料,还增加了一个新矿物：碲锌（铁）石（Zineospiroffite）,它发表在英文稿付印之后。本文按化学组成和年代顺序对中国发现的新矿物进行了分析。所有列出的新矿物都是经过IMA-CNMMN批准的或者是“祖先级”（“grandfathered”）的矿物,只有一个是没有被批准的矿物。新矿物是按英文字母的顺序排列的。  相似文献   

Response of the terrestrial carbon cycle to the El Niño-Southern Oscillation     

HAIFENG QIAN  RENU JOSEPH  NING ZENG 《Tellus. Series B, Chemical and physical meteorology》2008,60(4):537-550

  相似文献   

Evidence from Xenoliths for a Dynamic Lower Crust, Eastern Mojave Desert, California   总被引：2，自引：1，他引：1  

HANCHAR  JOHN M.; MILLER  CALVIN F.; WOODEN  JOSEPH L.; BENNETT  VICTORIA C.; STAUDE  JOHN-MARK G. 《Journal of Petrology》1994,35(5):1377-1415

Garnet-rich xenoliths in a Tertiary dike in the eastern MojaveDesert, California, preserve information about the nature andhistory of the lower crust. These xenoliths record pressuresof 10–12 kbar and temperatures of 750–800C. Approximately25% have mafic compositions and bear hornblende + plagioclase+ clinopyroxene + quartz in addition to garnet. The remainder,all of which contain quartz, include quartzose, quartzofeldspathic,and aluminous (kyanitesillimanite-bearing) varieties. Mostxenoliths have identifiable protoliths—mafic from intermediateor mafic igneous rocks, quartzose from quartz-rich sedimentaryrocks, aluminous from Al-rich graywackes or pelites, and quartzofeldspathicfrom feldspathic sediments and/or intermediate to felsic igneousrocks. However, many have unusual chemical compositions characterizedby high FeO(t), FeO(t)/MgO, Al₂O₃, and Al₂O₃/CaO, which correspondto high garnet abundance. The mineralogy and major-and trace-elementcompositions are consistent with the interpretation that thexenoliths are the garnet-rich residues of high-pressure crustalmelting, from which granitic melt was extracted. High ⁸⁷Sr/⁸⁶Srand low ¹⁴³Nd/¹⁴⁴Nd, together with highly discordant zirconsfrom a single sample with Pb/Pb ages of 1.7 Ga, demonstratethat the crustal material represented by the xenoliths is atleast as old as Early Proterozoic. This supracrustal-bearinglithologic assemblage may have been emplaced in the lower crustduring either Proterozoic or Mesozoic orogenesis, but Sr andNd model ages> 4 Ga require late Phanerozoic modificationof parent/daughter ratios, presumably during the anatectic event.Pressures of equilibration indicate that peak metamorphism andmelting occurred before the Mojave crust had thinned to itscurrent thickness of <30 km. The compositions of the xenolithssuggest that the lower crust here is grossly similar to estimatedworld-wide lower-crustal compositions in terms of silica andmafic content; however, it is considerably more peraluminous,has a lower mg-number, and is distinctive in some trace elementconcentrations, reflecting its strong metasedimentary and restiticheritage. ^* Author to whom correspondence should be addressed. Present address: Rensselaer Polytechnic Institute, Department of Earth and Environmental Sciences, Troy, New York 12180, USA. Fax: 518–276–8627; email: hanchj{at}rpi.edu.  相似文献   

Sulfur deposition onto European forests: throughfall data and model estimates     

WILFRIED IVENS  PEKKA KAUPPI  JOSEPH ALCAMO  MAXIMILIAN POSCH 《Tellus. Series B, Chemical and physical meteorology》1990,42(3):294-303

  相似文献   

Fundamental operations in computer-assisted map analysis     

JOSEPH K. BERRY 《International journal of geographical information science》2013,27(2):119-136

Abstract

Geographical information systems (GIS) provide capabilities for the mapping, management and analysis of cartographic information. Unlike most other disciplines, GIS technology was born from specialized applications. A comprehensive theory relating the various techniques used in these applications is only now emerging. By organizing the set of analytic methods into a mathematical structure, a generalized framework for cartographic modelling is developed. Within this framework, users logically order primitive operators on map variables in a manner analogous to traditional algebra and statistics. This paper describes the fundamental classes of operations used in computer-assisted map analysis. Several of the procedures are demonstrated using a fourth-generation computer language for personal computers.  相似文献   

Interannual variability of total ozone and its relation with the Asia Pacific Wave     

V. SATHIYAMOORTHY†  K. MOHANKUMAR  P. V. JOSEPH 《Tellus. Series B, Chemical and physical meteorology》2002,54(3):269-277

Analysis of the NCEP/NCAR reanalysis wind data shows the presence of a stationary Rossby wave in the lower stratosphere during May. This wave is seen prominently below 70 hPa level, confined between 10°N and 50°N latitudes and has a zonal wave number of 6 or 7. It is an extension into the stratosphere of the Asia Pacific Wave (APW) of the troposphere documented by Joseph and Srinivasan (1999) . As in the troposphere, in the lower stratosphere this wave shows a phase shift of 20° longitude between deficient and excess Indian summer monsoon rainfall (ISMR) years. This wave has maximum amplitude at about 200 hPa. The amplitude of the wave decreases both above and below 200 hPa level. The large-amplitude portion of this wave is thus situated in the break region between the tropical and extratropical tropopauses around 30°N latitude. It is suggested that this large-amplitude APW exchanges the tropical and extratropical airmasses through the tropopause break, making the APW signature seen in the satellite monitored total ozone (TOMS data). APW is found to exist in the following monsoon season (June to September) with the same phase as in May and its signature is also seen in that season in total ozone.  相似文献   

An initial-value problem for testing numerical models of the global shallow-water equations     

JOSEPH GALEWSKY  RICHARD K. SCOTT  LORENZO M. POLVANI 《地球，A辑:动力气象学与海洋学》2004,56(5):429-440

  相似文献   

Studies using an airborne laser altimeter to measure landscape properties     

JERRY C. RITCHIE  THOMAS J. JACKSON  JURGEN D. GARBRECHT  EARL H. GRISSINGER  JOSEPH B. MURPHEY  JAMES H. EVERITT 《水文科学杂志》2013,58(5):403-416

Abstract

Vertical surface properties of the landscape were measured using a laser altimeter mounted in a small twin-engine aeroplane. The laser altimeter makes 4000 measurements per second with a vertical recording precision of 0.05 m for a single measurement. These airborne laser measurements were analysed to provide information on topography, vegetation canopy and stream and gully cross-sections. Laser altimeter data were used to measure small (less than 0.20 m deep) and large gullies and stream cross-sections. Vegetation canopy heights, cover, structure and distribution were determined in studies in Texas and Arizona. Laser measurements of vegetation cover and height were significantly correlated with ground measurements made with line-intercept methods. While conventional ground-based techniques may be used to make all these measurements, airborne laser altimeter techniques allow the data to be collected in a quick and efficient way over large and inaccessible areas. The airborne laser altimeter data can also help quantify various land surface parameters needed for natural resource and landscape management or required by hydrological simulation models. Measurements of landscape properties over large areas provide a better understanding of landscape functions and can lead to the development of better management plans to conserve and improve the productivity of natural resources.  相似文献