Pre-Middle Jurassic accretionary metamorphism in the southern Klamath Mountains of northern California, USA     

J. W. GOODGE 《Journal of Metamorphic Geology》1995,13(1):93-110

Abstract High- P/T metamorphic parageneses are preserved within two late Palaeozoic to early Mesozoic assemblages of the southern Klamath Mountains that show contrasting structural styles and mineral parageneses reflecting formation in different parts of a subduction-zone regime. Blueschist facies tectonites of the Stuart Fork terrane represent a coherent subduction complex formed at relatively deep crustal levels, whereas the chaotic metasedimentary mélange of the eastern Hayfork terrane contains a diverse range of metamorphic parageneses reflecting complex structural mixing of metamorphic components at shallower levels. The convergent-margin-type accretionary metamorphism evident in both terranes pre-dates Middle Jurassic low- P/T metamorphism resulting from regional tectonic contraction and magmatism.
The epidote- to lawsonite-zone Stuart Fork blueschists (and eclogites locally) formed at pressures of about 6-11 kbar and temperatures of 250-400° C. Deformed matrix material of the eastern Hayfork mélange formed at similar temperatures but lower pressures, on the order of 3-6 kbar. The mélange contains a diverse assemblage of tectonic blocks that formed under a range of P-T conditions, including those of the blueschist, pumpellyite-actinolite, greenschist and upper greenschist to amphibolite facies.
The succession of mineral parageneses and inferred P-T conditions of the eastern Hayfork blocks reflect those of igneous protolith formation, structural mixing, subduction-zone metamorphism, olistolith transport, and tectonic and erosional denudation. Although temporal relations are not well constrained, the evolution of these terranes is consistent with formation within a single convergent-margin system.  相似文献   

BOOK REVIEWS     

《The Professional geographer》1985,37(2):226-262

Book Reviewed in this article: The City in Cultural Context . John Agnew, John Mercer, David Sopher, eds. Soils and Geomorphology Peter W. Birkeland. Urbanization and Settlement Systems, International Perspectives . L. S. Bourne, R. Sinclair, and K. Dziewoński. eds. An Introduction to Urban Historical Geography . Harold Carter. Overshoot, The Ecological Basis of Revolutionary Change . William J. Catton, Jr. Rivers of the World . Eberhard Czaya. Jewish Communities in Frontier Societies: Argentina, Australia and South Africa . Daniel J. Elazar with Peter Medding. Color in Public Spaces: Toward a Communication-Based Theory of the Urban Built Environment. Kenneth E. Foote. Spatial Statistics and Models. Gary L. Gaile and Cort J. Willmott, eds. Mega-Geomorphology. Rita Gardner and Helen Scoging, eds. Technological Change and Regional Development. Gillespie, ed. The Arid Lands: Their Use and Abuse. R. L. Heathcote. The Location of Industry in Britain. A. G. Hoare. Groundwater as a Geomorphic Agent . R. G. LaFleur, ed. Rural Public Services: International Comparisons. Richard E. Lonsdale and Gyorgy Enyedi, eds. Saving Water in a Desert City. William E. Martin, Helen M. Ingram, Nancy K. Laney, and Adrian H. Griffin. Water Resources: Distribution, Use and Management. John R. Mather. Transnationals and the Third World: The Struggle for Culture. Armand Mattelart. South Hadley, MA: USGS Digital Cartographic Data Standards. R. B. McEwen, R. E. Witmer, and B. S. Ramey, eds. The Ecosystem Concept in Anthropology. Emilio F. Moran, ed. Boulder, CO: Women, Men, and the International Division of Labor. June Nash and Maria Patricia Fernandez-Kelly, eds. Nuclear Power: Assessing and Managing Hazardous Technology. Martin J. Pasqualetti and K. David Pijawka, eds. Mary Somerville and the Cultivation of Science 1815-1840. Elizabeth Chalmers Patterson. An Introduction to Coastal Geomorphology. John Pethick. Late Quaternary Environments of the United States , Vol. 1, The Late Pleistocene. Stephen C. Porter, ed. Planning and Ecology. R. D. Roberts and T. M. Roberts, eds. Regionalism and the Pacific Northwest. William G. Robbins, Robert J. Frank, and Richard E. Ross, eds. Environment and Health. Anthony J. Rowland and Paul Cooper. Sunbelt/Snowbelt: Urban Development and Regional Restructuring. Larry Sawers and William K. Tabb, eds. The Bad Earth. Environmental Degradation in China. Vaclav Smil. Armonk, NY: Voyage into Substance: Art, Science, Nature, and the Illustrated Travel Account, 1760–1840. Barbara Maria Stafford. The Institute of British Geographers: The First Fifty Years. Robert W. Steel. Visions of the Past. Christopher Taylor and Richard Muir. Glacial Lake Agassiz. J. T. Teller and Lee Clayton, eds. The Tule Breakers: The Story of the California Dredge. John Thompson and Edward A. Dutra. The Balkan City 1400–1900. Nikolai Todorov. Explanation, Prediction and Planning: the Lowry model. Michael J. Webber. Mercedes Reales: Hispanic Land Grants of the Upper Rio Grande Region. Victor Westphall. The World Atlas of Revolutions. Andrew J. M. Wheatcroft. The West European City, A Social Geography. Paul White. Urban Elites and Mass Transportation. J. Allen Whitt. Princeton, NJ: Urban Life In Contemporary China. Martin King Whyte and William L. Parish. The Demand for Energy in the Soviet Union. David Wilson. London and Canberra: Rethinking Geographical Inquiry. J. David Wood, ed.  相似文献   

BOOK REVIEWS     

《The Professional geographer》1985,37(3):357-389

Book Reviewed in this article: Redundant Spaces in Cities and Regions? Studies in Industrial Decline and Social Change . J. Anderson, S. Duncan and R. Hudson. eds. The Social Consequences and Challenges of New Agricultural Technologies . Gigi M. Berardi and Charles C. Geisler, eds. Determinants of Fertility in Developing Countries, Vol. I, Supply and Demand for Children . Rodolfo A. Bultao and Ronald D. Lee, eds. Computer Mapping: Progress in the‘80s . James R. Carter. Washington: Colonial Africa . A. J. Christopher. Geography of the Soviet Union . J. P. Cole. Chicago Mapmakers, Essays on the Rise of the City's Map Trade . Michael P. Conzen, ed. Changes in the Land: Indians, Colonists and the Ecology of New England . William Cronon. Mizner's Florida: American Resort Architecture . Donald W. Curl. Geographical Studies on the Soviet Union: Essays in Honor of Chauncy D. Harris . George Demko and Roland J. Fuchs, eds. Fluvial Hydrology . S. Lawrence Dingman. Pueblo Indian Water Rights: Struggle For a Precious Resource . Charles T. DuMars, Marilyn O'Leary and Albert E. Utton. Women in the Cities of Asia: Migration and Urban Adaptation . James T. Fawcett, Siew-Ean Khoo, and Peter C. Smith, eds. America's National Parks and Their Keepers . Ronald A. Foresta. Neighborhood Revitalization and the Postindustrial City . Dennis E. Gale. China in Canada: A Dialogue on Resources and Development . R. Louis Gentilcore, ed. China: The 80s Era . Norton Ginsburg and Bernard A. Lalor, eds. Boulder, CO: Global Resources: Challenges of Interdependence . Martin I. Glassner, ed. River Networks . Texas: A Geography . Terry G. Jordan with John L. Bean, Jr. and William M. Holmes. The American Frontier: An Archaeological Study of Settlement Pattern and Process . Kenneth E. Lewis. Water Resources, Geography and Law . Olen Paul Matthews. A Field Guide to American Houses . Virginia and Lee McAlester. Population: Patterns, Dynamics, and Prospects . James L. Newman and Gordon E. Matzke. Wood, Brick, and Stone, The North American Settlement Landscape, Vol. 1: Houses . Allen G. Noble. Historical Analysis in Geography . William Norton. The Displaced Worker and Community Response: Case Study of Portsmouth, Scioto County, Ohio . H. Milton Patton and Janet W. Patton. Disaster Management: Warning Response and Community Relocation . Ronald W. Perry and Alvin H. Muskatel. The Anthropology of Space: Explorations into the Natural Philosophy and Semantics of the Navajo . Rik Pinxten, Ingrid van Dooren, and Frank Harvey. What STYLE Is It? A Guide To American Architecture . John C. Poppeliers, S. Allen Chambers, Jr., and Nancy B. Schwartz. Appalachia: A Regional Geography—Land, People and Development . Karl Raitz and Richard Ulack. An Introduction to Urban Geography . John R. Short. Ford, A Village in the West Highlands of Scotland: A Case Study of Repopulation and Social Change in a Small Community . John B. Stephenson. Income and Jobs: USA Diagnosing the Reality . George Sternlieb and James W. Hughes. Weather and Climate of the Antarctic . W. Schwerdtfeger. History and Ecology: Studies of the Grassland, James C. Malin . Robert P. Swierenga, ed. Optimal Control of Spatial Systems . K. C. Tan and R. J. Bennett. Social Science and Revolutions . Stan Taylor. The Global Textile Industry . Brian Toyne, Jeffrey S. Arpan, David A. Ricks, Terence A. Shimp and Andy Barnett. Integrated Water Development: Water Use and Conservation Practice in Western Colorado . James L. Wescoat, Jr. Proceedings of the First International Symposium on Maps and Graphics for the Visually Handicapped . Joseph W. Wiedel, ed.  相似文献   

Petrogenesis of UHP metamorphic rocks from Qinglongshan, southern Sulu, east-central China   总被引：23，自引：0，他引：23  

Zeming Zhang  Yilin Xiao  Fulai Liu  J.G. Liou  Jochen Hoefs 《Lithos》2005,81(1-4):189-207

Five kinds of UHP metamorphic rocks, including eclogite, orthogneiss, paragneiss, schist and quartzite are exposed in the Qinglongshan roadcut, southern Sulu orogenic belt of eastern central China. They comprise metamorphic supracrustal rocks with bimodal volcanic characteristics and continental affinity, and granitic intrusive associations. The preservation of coesite inclusions and/or its pseudomorphs in eclogite and other rocks indicate that they have been subjected to in-situ UHP metamorphism. Four stages of metamorphism were recognized by combining petrographic observations and compositions of minerals from various UHP rocks. Prograde epidote-amphibolite facies, UHP coesite–eclogite facies, post UHP quartz–eclogite facies, and retrograde amphibolite facies assemblages delineate an inferred P–T path with a clockwise trajectory and a retrograde event characterized by the coupling of decompression with a temperature decrease. Garnet porphyroblasts in UHP eclogites display a complex growth zoning and mineral distribution, and record a crucial segment of the prograde and retrograde metamorphic evolution. The preservation of growth zoning in eclogitic and gneissic garnets suggests that the UHP rocks had a short residence time before retrograde metamorphism and a very high uplift rate in order to preserve the prograde growth zoning.  相似文献   

Phase Relations and Stability of Magnetoplumbite- and Crichtonite-Series Phases under Upper-Mantle P-T Conditions: an Experimental Study to 15 GPa with Implications for LILE Metasomatism in the Lithospheric Mantle     

KONZETT  JURGEN; YANG  HEXIONG; FROST  DANIEL J. 《Journal of Petrology》2005,46(4):749-781

High-pressure–high-temperature experiments were performedin the range 7–15 GPa and 1300–1600°C to investigatethe stability and phase relations of the K- and Ba-dominantmembers of the crichtonite and magnetoplumbite series of phasesin simplified bulk compositions in the systems TiO₂–ZrO₂–Cr₂O₃–Fe₂O₃–BaO–K₂Oand TiO₂–Cr₂O₃–Fe₂O₃–BaO–K₂O. Both seriesof phases occur as inclusions in diamond and/or as constituentsof metasomatized peridotite mantle xenoliths sampled by kimberlitesor alkaline lamprophyres. They can accommodate large ion lithophileelements (LILE) and high field strength elements (HFSE) on awt % level and, hence, can critically influence the LILE andHFSE budget of a metasomatized peridotite even if present onlyin trace amounts. The Ba and K end-members of the crichtoniteseries, lindsleyite and mathiasite, are stable to 11 GPa and1500–1600°C. Between 11 and 12 GPa, lindsleyite breaksdown to form two Ba–Cr-titanates of unknown structurethat persist to at least 13 GPa. The high-pressure breakdownproduct of mathiasite is a K–Cr-titanate with an idealizedformula KM₇O₁₂, where M = Ti, Cr, Mg, Fe. This phase possessesspace group P6₃/m with a = 9·175(2) Å, c = 2·879(1)Å, V = 209·9(1) ų. Towards high temperatures,lindsleyite persists to 1600°C, whereas mathiasite breaksdown between 1500 and 1600°C to form a number of complexTi–Cr-oxides. Ba and K end-members of the magnetoplumbiteseries, hawthorneite and yimengite, are stable in runs at 7,10 and 15 GPa between 1300 and 1400°C coexisting with anumber of Ti–Cr-oxides. Molar mixtures (1:1) of lindsleyite–mathiasiteand hawthorneite–yimengite were studied at 7–10GPa and 1300–1400°C, and 9–15 GPa and 1150–1400°C,respectively. In the system lindsleyite–mathiasite, onehomogeneous Ba–K phase is stable, which shows a systematicincrease in the K/(K + Ba) ratio with increasing pressure. Inthe system hawthorneite–yimengite, two coexisting Ba–Kphases appear, which are Ba rich and Ba poor, respectively.The data obtained from this study suggest that Ba- and K-dominantmembers of the crichtonite and magnetoplumbite series of phasesare potentially stable not only throughout the entire subcontinentallithosphere but also under conditions of an average present-daymantle adiabat in the underlying asthenosphere to a depth ofup to 450 km. At still higher pressures, both K and Ba may remainstored in alkali titanates that would also be eminently suitablefor the transport of other ions with large ionic radii. KEY WORDS: crichtonite; magnetoplumbite; high-P–T experiments; phase relations; upper mantle  相似文献   

黄铁矿加热过程中的矿相变化研究——基于磁化率随温度变化特征分析   总被引：19，自引：2，他引：19       下载免费PDF全文

李海燕  张世红 《地球物理学报》2005,48(6):1384-1391

对采自河南嵩县祁雨沟7号角砾岩筒的黄铁矿样品进行了详细的磁化率随温度变化特征研究，加热的最高温度为700℃，结果表明黄铁矿受热分解最终生成磁黄铁矿.黄铁矿通过两个可能的途径转变为磁黄铁矿：一个是黄铁矿颗粒首先经表面吸附氧的氧化转变为磁铁矿，随温度升高新生成的磁铁矿与黄铁矿晶格中挥发出的硫进一步反应转变为磁黄铁矿；另一可能途径是黄铁矿直接脱硫转变为磁黄铁矿，此反应为磁黄铁矿的主要来源.氩气环境下加热过程中，从约380℃开始即有磁铁矿生成，但直到约535℃才有磁黄铁矿的生成.在535℃～560℃的加热过程中生成的磁黄铁矿居里温度不稳定，直到加热至高于约560℃时才生成居里温度稳定的磁黄铁矿.氩气环境下，黄铁矿受热生成的磁性矿物的类型仅受最高温度的控制，与高温段的滞留时间无明显关系，而其生成量同时受最高温度和高温段滞留时间的控制.  相似文献   

中朝地台的志留系——纪念中、韩两国杰出的微体古生物学者安太庠和李河荣     

李东津  殷长建  路孝平 《世界地质》2006,25(4):323-331

中朝地台内部无争议的志留系只有朝鲜半岛平南盆地的谷山组和宝良里组。中朝地台北缘活动陆缘带志留系比较发育,有桃山组、西别河组(至少其大部分)等。李河荣等根据牙形刺将朝鲜半岛太白山盆地的桧洞里组划归志留系,但是从层序、岩石和安太庠修定的牙形刺化石来看,桧洞里组可能不是志留系,而是与中朝地台华北区峰峰组八陡段(或包括部分耀县组)可比的中奥陶世地层。微体古生物学家安太庠和李河荣分别为中国和韩国的牙形学及其生物地层学研究做出了重要贡献。他们的英年早逝,对东北亚地学研究是一个重大损失。  相似文献   

NCEP-FNL与T213L31同化资料对比 分析中的地形差异影响     

李长青  闫之辉  王瀛  郜凌云 《气象》2007,33(1):62-69

分析了2005年5月11日至6月10日的NCEP—FNL与T213L31分析资料在位势高度、温度和风场上的整体差异，揭示了低层差异最小，差异极值主要分布在3个关键区的特征。进一步通过地形高度差异与位势高度差异的相关性分析，认为青藏高原附近的地形高度差异的极值是引起两种资料位势高度差异的主要原因，并计算分析了这种差异对高原周围中低层大气环流的动力和热力影响。结果显示，在NCEP—FNL中的西南涡强度和热源作用较强，中层风速切变较弱。  相似文献   

2007年6—8月T213与ECMWF及日本模式中期预报性能检验   总被引：1，自引：3，他引：1  

李勇 《气象》2007,33(11):93-100

对2007年6—8月T213模式进行天气学检验,并与欧洲中心ECMWF模式及日本模式进行了比较。结果表明:3种模式对亚洲中高纬环流形势的调整演变具有较好的预报性能。综合来看,ECMWF模式对各系统及要素的预报误差最小,最接近实况,日本模式和T213模式稍差,稳定性不如ECMWF模式,特别是T213模式对0709号台风圣帕路径及强度的预报与实况相差较大,而ECMWF模式及日本模式预报较为准确。  相似文献   

浅谈质量管理体系在测绘生产单位中的应用     

刘玉杰 《四川测绘》2007,30(6):278-280

本文在简要叙述了GB/T19001-2000(idt ISO 9001:2000)质量管理体系的基础上,以测绘产品的质量控制为例论述了质量管理体系在测绘生产单位的具体应用。通过实施质量管理体系,实现对生产过程的质量控制,实现持续改进,不断地提高产品质量。  相似文献