Editorial     

Z. Švestka  C. De Jager 《Solar physics》1969,8(1):3-4

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Solar Physics at the Goddard Space Flight Center     

John C. Brandt 《Solar physics》1969,6(3):490-497

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Ground-Water Studies— Chicagoland Deep Tunnel System     

Istavros S. Papadopulos  William R. Larsen  Forrest C. Neil 《Ground water》1969,7(5):3-15

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CHANGING RURAL SETTLEMENT PATTERNS IN ARCTIC ALASKA*     

Ralph C. Brown 《The Professional geographer》1969,21(5):324-327

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Lineages and Fractionation Trends in Undersaturated Volcanic Rocks from the East Otago Volcanic Province (New Zealand) and Related Rocks     

COOMBS  D. S.; WILKINSON  J. F. G. 《Journal of Petrology》1969,10(3):440-501

The petrology of the East Otago Volcanic Province (late Miocene),including the Dunedin Complex, is dominated by undersaturatedsodic lavas and shallow intmsives whose compositions range fromalkali basalt, basanite, and nephelinite to trachyte and phonolite.A range of relatively potassic volcanic rocks is also developedin the Province. The degree of undersaturation and ratios suchas (FeO+Fe₂O₃):MgO and K₂O:Na₂O vary widely in rocks with comparabledifferentiation indices. Chemical and mineralogical data onwhole rock-glass pairs and variants of shallow intrusives inthe Province, assessed in conjunction with similar data fromother volcanic provinces, demonstrate the production of trachyticliquids from alkali basaltic parents and of phonolitic liquidsfrom basanitic parents. Fractionation trends in both sodic andpotassic series, defined by variation in differentiation indexand normative nepheline, indicate that the degree of undersaturationof the derivative salic liquids is dependent on that of theparent; the slope of the fractionation trend lines is influencedby additional factors, including Po₂. The unequivocal productionof phonolite from trachyte in the East Otago Province has notbeen demonstrated. The mafic variants of theralites from Waihola and a basanite-pegmatoidassociation from Omimi are similar in composition, but the mostsalic differentiates from these differentiation sequences displaypronounced differences in their KO:Na₂O ratios, tending towardsleuco-theralitic (cf. lugarite) and malignitic compositionsrespectively. A multicomponent spectrum of fractionation lineages is suggestedfor individual differentiated bodies and for lava series. Sodiclineages include: (I) alkali basalt–hawaiite–mugearite–benmoreite–trachyte;(2) a more undersaturated series from basanite through nephelinehawaiite, nepheline mugearite, and nepheline benmoreite, tophonolite; (3) a nephelinite series, more restricted in compositionalrange. The relatively high Fe: Mg ratios characterizing themugearitic variants are sometimes exhibited by members of themore potassic series in which, however, Fe:Mg ratios tend tobe characteristically lower. This feature is correlated withthe frequent occurrence of kaersutitic amphibole or its resorptionproducts, indicative of intratelluric fractionation under relativelyhydrous conditions and probably relatively high Po₂. Certainnepheline trachyandesites from East Otago are described in detail.Trachy-basalt-trachyandesite-tristanite-trachyte and sanidinebasanite-nepheline trachyandesite-nepheline tristanite-phonolitelineages are also proposed, and the nomenclature of these moreseries discussed.  相似文献   

THE DELINEATION OF THE BEDROCK CONFIGURATION OF PART OF PORT JACKSON,NEW SOUTH WALES,WITH A BOOMER SYSTEM*     

D. W. EMERSON  C. V. G. PHIPPS 《Geophysical Prospecting》1969,17(3):219-230

A high resolution Boomer system was used to investigate the bedrock configuration of part of Port Jackson, New South Wales. The continuous reflection profiling technique was successful in delineating a channel incised in bedrock under a thickness of up to 60 m. of unconsolidated sediment covered by up to 20 m. of water.  相似文献   

SUMMARY OF AAG COUNCIL MINUTES ANN ARBOR,AUGUST 14, 1969     

Wesley C. Calef 《The Professional geographer》1969,21(6):415-417

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CHANGES IN THE MORPHOLOGY OF THREE AMERICAN CENTRAL BUSINESS DISTRICTS 1952–1966     

David C. Weaver 《The Professional geographer》1969,21(6):406-410

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The Lausanne Congress: Commission     

J. Visser 《The Photogrammetric Record》1969,6(34):408-409

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THE AIR PHOTOGRAPH REQUIREMENTS OF GEOLOGISTS     

J. W. Norman 《The Photogrammetric Record》1968,6(32):133-149

The geologist's use of air photographs and the characteristics studied by photogeologists are briefly described. The influence of photographic factors such as scale, season, time of day, film type, processing, overlap and dimensional accuracy are considered from the geologist's viewpoint.  相似文献