radiolaria - Marum

More documents

Recommendations

Info

Bibliography - 1990 Radiolaria 14 continental margin of India. Oceanologica Acta, 13/3, 327- 333. Twenty-one surficial sediment samples were analysed for planktonic foraminifers, radiolarians, calcium carbonate and organic carbon. The distribution of these parameters suggest that the sediments record an upwelling signature. Q-mode factor analysis of twenty-two planktonic foraminifera species reveals four assemblages accounting for 96% of the information given in the original data matrix. Based on the distribution of factor loadings, the frequency of Globigerina bulloides in the sediments can be used to reconstruct the intensity of past upwelling in the Arabian Sea. Dunbar, R.B., Mucciarone, D., Jones, B., Leventer-Reed, A.R., Pyne, A.R. & Moser, C. 1990. Biogenic sediments fluxes in the western Ross Sea. Antarct. J. U. S., 25/5, 100-102. Although it is clear that deep shelf currents play a major role in the redistribution of biogenic phases on the antarctic margin, the extent to which photic-zone and mid-water-column processes control the flux of organic debris to the seafloor is not yet known. A major impediment to a more complete understanding of the fluxes of key elements like carbon, nitrogen, silicon, and phosphorus in the southern ocean water column has been the absence of year-round environmental monitoring and sampling. Our principal goal during the 1989-1990 field season was to install four sets of time-series sediment traps on winter-over moorings in the western Ross Sea. We also recovered winter-over moorings equipped with current meters and single-cup sediment traps and completed a sediment collection program in Granite Harbor. Our field work was conducted from the sea ice during November, 1989, and aboard the R/V Polar Duke during January and February, 1990. On Polar Duke, we deployed six time-series (15 cups) sediment traps at three sites in the western Ross Sea. These deployments are part of an interdisciplinary, multi-institutional study of the biogeochemical cycles of silicon and carbon in the Ross Sea. The sediment traps will be deployed for 2 years and will provide the first view of sediment fluxes over a monthly time-scale throughout the austral winter and summer in the Ross Sea. These results will complement the water-column production and recycling studies of organic matter (W. Smith, University of Tennessee) and biogenic silica (D. Nelson, Oregon State University), and the shelf current and seafloor sediment studies of D. DeMaster (North Carolina State University) and C. Nittrouer (State University of New York at Stonybrook). The mooring sites (table 1) were located at the ends of sampling transects which traverse areas ranging from icefree to heavily ice-covered during most of the austral summer. Mooring A is located in a region of highly biosiliceous seafloor sediment (greater than 40 percent opal; Dunbar et al. 1985) and in which a large ice-edge bloom was encountered Farimond, P., Eglinton, G. & Brassell, S.C. 1990. The Cenomanian-Turonian anoxic event in Europe; an organic geochemical study. Marine Petroleum Geol., 7/1, 75- 89. Thirty-two sediment samples, mainly. black shales from Cenomanian/Turonian organic-rich sequences in Europe and Tunisia, were examined by organic geochemical techniques. The results of molecular analyses indicate that all the black shales are dominated by marine-derived organic matter from both algal and bacterial sources, with only a minor terrestrial component. Oxygen-deficient conditions prevailed during the deposition of the black shales, although interbedded non-laminated, organic-lean horizons indicate that oxygen deficiency was intermittent at some sites. The presence of 17 α (H), 18 α (H), 21 β (H)-28, 30-bisnorhopane in some black shale samples from shallow shelf areas may be evidence for severely oxygen-depleted conditions, possibly in association with upwelling and an oxygen-minimum layer. Overall, the organic geochemical data are in agreement with a depositional model whereby an oxygen-minimum layer developed in response to high surface productivity. This oxygen-minimum layer may have extended over a considerable thickness of the water column (>1000 m) in some areas. We report the first observation of an A-ring methylated C29 hopane, namely methyl-17 α (H), 18 α (H), 21 β (H)-28, 30bisnorhopane. The environmental significance of this compound cannot yet be assessed, although in the sample in which it occurs, the direct parallel between the carbon number distribution of the hopanes and that of the methylhopanes suggests either that they have the same biological origin or that methylation of hopanoids may have occurred, possibly during diagenesis. Faure, M. & Ishida, K. 1990. The mid-Upper Jurassic olistostrome of the west Philippines: a distinctive keymarker for the North Palawan block. J. Southeast Asian Earth Sc., 4/1, 61-67. - 46 - A field survey in North Palawan shows that this part of the island is mainly occupied by a chaotic clastic sequence in which several facies are distinguished; namely turbidite and slump deposits, pebbly mudstone, thick coarse sandstone and olistostrome, with exotic blocks of Permian or Triassic chert and limestone Mid-Upper Jurassic Limestone, acidic lava and volcanoclastic rocks. Callovian to Lower Kimmeridgian radiolarian assemblages have been discovered from the mudstone matrix. Combining our new results with previous stratigraphic data, it is likely that the olistostrome with exotic blocks is followed by late Cretaceous-Eocene (?) turbidites. The same kind of olistostrome is known from the Calamian, Mindoro, Panay and Carabao islands. We propose that this olistostrome can be used as a distinctive criteria of the Palawan block. Comparisons of the age range of the matrix and the nature of the olistoliths suggest that the Palawan olistostrome can be correlated with the Sanbosan zone of S.W. Japan and central Ryukyu. To the south, such an Upper Jurassic olistostrome has not yet been recognized, though it is probably present below the chert-spilite formation of Borneo. Febvre, J. 1990. Phylum Actinopoda Class Acantharia. In: Handbook of Protoctista. (Margulis, L., Corliss, J.O., Melkonian, M. & Chapman, D.J., Eds.), The Jones and Barlett Series in Life Sciences. Jones and Barlett Publishers, Boston. pp. 363-379. The Acantharia, comprising about 50 genera and 150 species in 20 families grouped into 4 orders,-display relatively little diversity. Systematics are given in Schewiakoff (1926) and Rechetniak (1981). They are unicellular phagotrophic actinopods which have three main distinctive characters: (i) skeletons of strontium sulfate (celestite) that exhibit a strictly defined configuration of 10 diametral or 20 radial spicules diverging according to Muller's law (Muller, 1858) (Fig. l); (ii) cell body covered with an outer pellicle, the periplasmic cortex (Febvre, 1972, 1974), composed of at least 20 polygonal parts centered around the apex of each spicule and joined to one another by elastic junctions (Febvre 1973); and (iii,' the possession of numerous ribbonlike or cylindrical motile organelles called myonemes composed of dense bundles of 3 nm microfilaments, each of which is connected by one end to the tip of the spicule and by the other end to the periplasmic cortex (Fig. 2, 3) (Febvre, 1971). Although they form cysts and mastigotes, sexual life cycles have never been described. Febvre, J., Febvre-Chevalier, C. & Sato, H. 1990. Polarizing microscope study of a contractile nanofilament system: the Acantharian myoneme. Biol. Cell, 69, 41-51. Birefringence changes have been studied during the contraction—relaxation cycle of the myonemes (contractile organelles consisting of a bundle of nonactin filaments) in Acantharians (Protista, Actinopoda). Myonemes can either contract rapidly or undulate slowly between their anchorage points. In thin sections they appear as a large cross-striated bundle with long clear zones (LZs) and thin transversal dense bands (TBs). The filaments (2-4 nm in diameter) are twisted in pairs in elementary microstrands. The spacing of the LZ depends on the extent of contraction [161. A negative birefringence has been seen in vivo and in vitro. In vivo, retardation varied with the extent of relaxation of the myoneme (2.5 nm-4.4 nm). When the myoneme was tightened, it appeared to be homogeneously dark or bright in contrast depending on the orientation for the vibrating plane of polarized light. When it was partially relaxed and moved slowly, a series of birefringent bands, 0.8-2.8 µm thick, could be seen. They propagated at the same speed (about 2 µm-s -1 ) by successive trains, either forward or backward. Each of these birefringent bands may correspond to 4-13 contracted LZs. It is suggested that the negative birefringence of the myoneme is mainly caused by the orientation of the filaments forming the microstrands. Our results strongly suggest that the orientation of the myoneme filaments is altered during the movement an-l that the orientation of the filaments in the negative bands is caused by perpendicular orientation compared to the other parts of the myoneme. These observations support our previous hypothesis in which we postulated that the length of the myoneme varies in relation to the pitch of the elementary microstrands. Febvre-Chevalier, C. 1990. Phylum Actinopoda Class Heliozoa. In: Handbook of Protoctista. (Margulis, L., Corliss, J.O., Melkonian, M. & Chapman, D.J., Eds.), The Jones and Barlett Series in Life Sciences. Jones and Barlett Publishers, Boston. pp. 347-362. The Heliozoa are a small group of predaceous heterotrophic actinopods, spherical unicells having naked, organic, or siliceous coated bodies from which long axopods radiate. Axopods, underlain by a microtubular axoneme, are used as organelles of locomotion and feeding. About 34 genera and more than 90 species have been
Radiolaria 14 Bibliography - 1990 reported (Rainer, 1968; Bardele, 1977; Thomsen, 1978; Shigenaka et al., 1980; Febvre-Chevalier, 1982). The heliozoa, once called "sun animalcules" are divided into two orders: Cryptaxohelida and Phaneraxohelida, each comprising four suborders (Febvre-Chevalier and Febvre, 1984). Eleven families can be recognized from the 14 genera so far examined ultrastructurally. Sexual processes have been reported in two species. Fourcarde, E., Azema, J., De Wever, P. & Busnardo, R. 1990. Contribution à la datation de la croûte océanique de l'Atlantique central: Age Valanginien inférieur des basaltes océaniques et âge Néocomien des calcaires maiolica de Maio (Iles du Cap Vert). Marine Geol., 95/1, 31- 44. The discovery of calpionellids and radiolarians in thin sedimentary layers intercalated in the upper part of MORB tholeiitic pillow basalts allows us to date the oceanic crust of Maio Island (Cape Verde Islands) as early Valanginian instead of, as was hitherto believed Late Jurassic. This new dating fits better with reconstructions of the geological history of the central Atlantic based on magnetic anomalies. The overlying light-coloured pelagic limestones (Maiolica facies) with radiolarians, apatychi and ammonites are Valanginian-Barremian in age. These limestones are lithologically similar to the white limestones drilled at several DSDP sites in the central Atlantic. Fukudomi, T. 1990. Jurassic melange, Kanoashi Complex, western Shimane Prefecture, southwestern Japan. J. geol. Soc. Japan, 96/8, 653-667. (in Japanese) The Kanoashi Complex in the western part of Shimane Prefecture is a melange composed of mudstone, sandstone and chert with a small amount of greenstones and limestone, ranging from Carboniferous to Jurassic in age. On the basis of the lithologic character, this complex is subdivided into four units, namely the Kl, K2, K3 and K4 in ascending order. Judging from the lithological, structural and chronological character, the Kanoashi Complex is regarded as an accretionary complex which was formed in a Jurassic subduction zone. Reconstructed strata of the Kanoashi Complex show that pelagic chert is always overlain by terrigenous clastic rocks. The youngest fossil age of the chert and the mudstone of each unit is younger than the unit above it. This younging direction from the upper unit to the lower one is explained by downward growing of the accretionary complex. This complex is correlated with the oldest unit of the Jurassic complex in the Mino and Tamba terrane, Southwest Japan. Furutani, H. 1990. Middle Paleozoic radiolarians from Fukuji Area, Gifu Prefecture, central Japan. J. Earth Sci. Nagoya Univ., 37, 1-56. Paleontological studies of middle Paleozoic radiolarians were carried out in the Fukuji Area, Gifu Prefecture, Central Japan. Paleozoic rocks of the Fukuji Area are divided into three facies: i.e. facies A, mainly composed of limestone and calcareous shale; facies B, mainly composed of clastic or pyroclastic rocks such as tuffaceous shale, tuff, sandstone and conglomerate; facies C, containing various kinds of rocks mainly pyroclastic and siliceous sedimentary rocks. Radiolarian fossils were extracted mainly from tuffaceous shale and shale of the facies B. In the radiolarian fauna five assemblages are recognized: i.e. Fusalfanus osobudaniensis Assemblage, Spongocoelia parvus - Spongocoelia kamitakarensis Assemblage, Zadrappolus yoshikiensis Assemblage, Stylosphaera? sp. A - Stylosphaera? sp. B Assemblage, and Stylosphaera? sp. C Assemblage in ascending order. Fusalfanus osobudaniensis Assemblage, Wenlockian or early Ludlovian in age, is characterized by Fusalfanus osobudaniensis, Secuicollacta itoigawai, Secuicollacta typica, Goodbodium elegans. Spongocoelia parvus and Spongocoelia kamitakarensis Assemblage, late Ludlovian or Pridolian, is characterized by Spongocoelia parvus, Spongocoelia kamitakarensis, Zadrappolus spinosus, and Secuicollacta vulgaris. Zadrappolus yoshikiensis Assemblage, latest Silurian or early Devonian, is characterized by Zadrappolus yoshikiensis, Zadrappolus tenuis, and Futobari morishitai. Stylosphaera? sp. A - Stylosphaera? sp. B Assemblage, early or middle Devonian, is characterized by Stylosphaera? sp. A, Stylosphaera? sp. B, and some undetermined species of Zadrappolus and Futobari. Stylosphaera? sp. C Assemblage, middle Devonian, is characterized by Stylosphaera? sp. C. Any radiolarians are not obtained from the facies A. Poorly preserved radiolarians with middle Devonian aspect were obtained from the siliceous rock of the facies C. In the Early Devonian time the rocks of the facies A, B, and C were probably contemporaneous heterotopic facies. The facies A, B, and C are represented by the Fukuji Formation, the part of the Zadrappolus yoshikiensis Assemblage and Stylosphaera ? sp. A and S? sp. B Assemblage, and the rock which yields Spongocoelia sp., respectively. It is considered that in the Early Devonian time the three facies were deposited from the shore to open sea in the order of the facies A, B, to C. At least a - 47 - part of Devonian radiolarians are thought to be dwellers of the neritic sea. In the Late Silurian time the facies A and the facies B were thought to be under the same condition as the Early Devonian time. Within the middle Paleozoic spicule bearing radiolarians seven types of spicules are recognized. Such radiolarians should be classified based on the construction of the spicule. 28 species belonging to 17 genera are described, of which 7 genera and 21 species are new. The genus Futobari n. gen. is characterized by a single cortical shell, double medullary shell, and 5 to 7 strong conical spines. The genus Zadrappolus n. gen. is characterized by a single cortical shell, double medullary shells, and numerous cylindrical spines. The genus Fusalfanus n. gen. is characterized by a spongy cortical shell with a pylome, double medullary shells, and many tapered spines. The genus Goodbodium n. gen. is characterized by having a tent-like shell and pendant spinules along the surface of the pyramid edged by four basal spines. The genus Holdsworthum n. gen. is characterized by a conical net formed by repeated bifurcations of three or four basal spines, and by the porous or poreless lamellae developed at the proximal part of the cone. The genus Fukujius n. gen. is characterized by 12 spines: i.e. 2 apical, 6 lateral, and 4 basal spines. The genus Nazaromistonella is characterized by having an oval ring, an intersector penetrating the ring, and other three extra-ring spines. Garrison, D.L. & Gowing, M.M. 1990. Protozooplankton. In: Antarctic Microbiology. (Friedman, E.I., Eds.). Wiley-Liss, pp. 123-165. Gersonde, R. et al. 1990. Biostratigraphic synthesis of Neogene siliceous microfossils from the Antarctic Ocean, ODP Leg 113 (Weddell Sea). In: Proceedings of the Ocean Drilling Program, Scientific Results. (Barker, P.F., Kennett, J.P. et al., Eds.), vol. 113. College Station, TX (Ocean Drilling Program), pp. 915-936. This paper summarizes the magnetostratigraphic and biostratigraphic results obtained with siliceous microfossils (diatoms, radiolarians, silicoflagellates) on Neogene sections recovered in the Weddell Sea (Antarctic Ocean) during Ocean Drilling Program Leg 113 (Sites 689, 690, 693, 694, 695, 696, and 697). The biostratigraphic studies resulted in the establishment of an improved and revised Neogene biosiliceous zonation for the Antarctic Ocean. The zones are calibrated directly to the geomagnetic time scale. This is the first attempt at direct calibration of Miocene Antarctic biostratigraphic zones with the geomagnetic time scale. Gorican, S. & Buser, S. 1990. Middle Triassic radiolarians from Slovenia (Yugoslavia). Geologija, 31-32, 133-197. The radiolarian fauna presented derives from five Middle Triassic localities in NW and central Slovenia. The sections consist of tuff and tuffite alternating with micritic limestone with chert. On the basis of radiolarians extracted from the limestone beds, an Upper Illyrian-Fassanian age is assumed for the Zaklanec, Bohinj and Vojsko localities and a Langobardian age for Vrsic and Mokronog. 89 species are included in the investigation, four of them are newly described: Dumitricasphaera ? pennata, Falcispongus uncus, Hozmadia pyramidalis, Plafkerium ? firmum. Granlund, A. 1990. Evolutionary trends of Antarctissa in the Quaternary using morphometric analysis. Mar. Micropaleontol., 15/3-4, 265-286. Three piston cores from a latitudinal traverse across the Polar Front in the southeast Indian Ocean have been used as the basis for a morphological analysis of the Antarctissa complex (Radiolaria) . All three cores penetrate sediments deposited during at least the last 0.5 Ma B.P. The radiolarian genus Antarctissa has been selected to look for variations in size and shape through time. The method used is an interactive outline detection utilizing a cubic b-spline technique. Shape change is evaluated by phi function analysis. Size variability is measured by the area of the test. The results of this study indicate that Antarctissa tests seem to oscillate in size and shape according to prevailing oceanographical/climatological conditions, and thus they may be employed as indices of paleoclimatological fluctuations in the Southern Ocean. The size pattern for Antarctissa shows larger forms during glacial periods and smaller forms during interglacial periods. For the shape change, the study is differentiated between an allometric component and one growth-free component. The allometric component shows variation closely related to the size pattern, i.e. an oscillating pattern close to the changes in glacial interglacial patterns. The growth-free shape component on the other hand shows a long-term variation in shape that may be interpreted as change due to evolution. The use of the computerized measuring technique employed here, enables
Page 1 and 2: RADI LARIA VOLUME 14 MAY 1994 NEWSL
Page 3 and 4: RADIOLARIA Newsletter of the Intern
Page 5 and 6: Radiolaria 14 Secretary's Letter Fi
Page 7 and 8: Radiolaria 14 News Usefulness of th
Page 9 and 10: Radiolaria 14 News U.S.S.R.,* and t
Page 11 and 12: Radiolaria 14 News we have our pets
Page 13 and 14: Radiolaria 14 News James Stratford
Page 15 and 16: Radiolaria 14 Symposia TX, 77845. Y
Page 17 and 18: Radiolaria 14 Symposia Ormiston, A.
Page 19 and 20: Radiolaria 14 Interrad VII Symposiu
Page 21 and 22: Radiolaria 14 Interrad VII FIELD EX
Page 23 and 24: Radiolaria 14 Meetings 1994 • 29
Page 25 and 26: Radiolaria 14 Bibliography - 1989 B
Page 27 and 28: Radiolaria 14 Bibliography - 1989 t
Page 29 and 30: Radiolaria 14 Bibliography - 1989 p
Page 31 and 32: Radiolaria 14 Bibliography - 1989 r
Page 35 and 36: Radiolaria 14 Bibliography - 1989 T
Page 37 and 38: Radiolaria 14 Bibliography - 1989 w
Page 39 and 40: Radiolaria 14 Bibliography - 1989 v
Page 41 and 42: Radiolaria 14 Bibliography - 1989 l
Page 43 and 44: Radiolaria 14 Bibliography - 1989 Y
Page 45 and 46: Radiolaria 14 Bibliography - 1990 A
Page 47: Radiolaria 14 Bibliography - 1990 o
Page 53 and 54: Radiolaria 14 Bibliography - 1990 r
Page 57 and 58: Radiolaria 14 Bibliography - 1990 S
Page 61 and 62: Radiolaria 14 Bibliography - 1991 B
Page 65 and 66: Radiolaria 14 Bibliography - 1991 a
Page 67 and 68: Radiolaria 14 Bibliography - 1991 o
Page 69 and 70: Radiolaria 14 Bibliography - 1991 K
Page 71 and 72: Radiolaria 14 Bibliography - 1991 o
Page 73 and 74: Radiolaria 14 Bibliography - 1991 1
Page 75 and 76: Radiolaria 14 Bibliography - 1991 s
Page 77 and 78: Radiolaria 14 Bibliography - 1992 g
Page 79 and 80: Radiolaria 14 Bibliography - 1992 S
Page 81 and 82: Radiolaria 14 Bibliography - 1992 n
Page 93 and 94: Radiolaria 14 Bibliography - 1992 &
Page 95 and 96: Radiolaria 14 Bibliography - 1993 A
Page 97 and 98: Radiolaria 14 Bibliography - 1993 h
Page 99 and 100:
Radiolaria 14 Bibliography - 1993 P
Page 101 and 102:
Radiolaria 14 Bibliography - 1993 K
Page 103 and 104:
Radiolaria 14 Bibliography - 1993 H
Page 105 and 106:
Radiolaria 14 Bibliography - 1993 r
Page 107 and 108:
Radiolaria 14 Bibliography - 1993 l
Page 109 and 110:
Radiolaria 14 Bibliography - 1994 t
Page 111 and 112:
Radiolaria 14 Announcements "RADREF
Page 113 and 114:
Radiolaria 14 Directory ARAKAWA Ryu
Page 115 and 116:
Radiolaria 14 Directory El KADIRI K
Page 117 and 118:
Radiolaria 14 Directory ISOZAKI Yuk
Page 119 and 120:
Radiolaria 14 Directory MAROLT Rich
Page 121 and 122:
Radiolaria 14 Directory REED Kitty
Page 123 and 124:
Radiolaria 14 Directory TAKAHASHI K
Page 125:
Mémoires de Géologie (Lausanne) I
show all

radiolaria - Marum

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?