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Bibliography - 1990 Radiolaria 14 Species constituents, relative species contributions, and seasonal flux patterns of diatoms and other siliceous plankton are very much alike at the two sites. The level of similarity between the two sites is as close as that between two different depths at Station Papa, suggesting tightness of covariance between the two sites. It is possible to conclude that the oceanic flux province of the two sites is nearly the same and that the processes responsible for such similar export productions must be similar. Although quality of the fluxes is similar, the flux levels are not exactly the same at the two sites. Overall diatom export production at Station Papa was about twice that at Station C. Flux levels of Radiolaria and silicoflagellates were also higher at Station Papa than at Station C. Seasonal flux maxima at Station C were generally delayed by 2 1 weeks over those at Station Papa. The lower flux levels and delayed flux peaks at Station C are correlated with density structure of upper water masses. Takami, M., Isozaki, Y., Nishimura, Y. & Itaya, T. 1990. Geochronology of weakly metamorphosed Jurassic accretionary complex (the Kuga Group) in eastern Yamaguchi Prefecture, Southwest Japan. J. geol. Soc. Japan, 96, 669- 681. Weakly metamorphosed Jurassic accretionary complex called the Kuga Group in eastern Yamaguchi Prefecture is composed mainly of olistostromal complex with matrices of mudstone and with allochthonous blocks of chert, sandstone, siliceous mudstone, black mudstone and greenstones. The northern part of this group (Northern Unit) is separated from the southern part (Southern Unit) by a north-dipping fault and is characterized by phyllitic nature of the rocks. Microfossil researches clarified that the Northern Unit contains Late Carboniferous to Late Triassic chert, Early Triassic and Late Triassic to Early Jurassic siliceous mudstone, and Early Jurassic black mudstone. Reconstructed primary stratigraphy of these rocks is identical to that of modern trench sediments. Although the age of matrices of mudstone has not been fixed, it is considered that the Northern Unit formed as an accretionary complex probably at early Middle Jurassic subduction zone. The rocks in the Northern Unit have undergone a high pressure type metamorphism of the pumpellyite-actinolite facies. K-Ar ages of recrystallized white micas from 18 phyllitic pelites in the Northern Unit concentrate in the range of 170-150 Ma (middle Middle to early Late Jurassic). Above-mentioned facts indicate that the Northern Unit of the Jurassic complex formed as an accretionary complex in early Middle Jurassic time and successively underwent a high pressure type metamorphism at the depth of subduction zone in middle Middle to early Late Jurassic time Takemura, A. 1990. Paleogene radiolarian biostratigraphy in the Antartic Ocean regions. Kaiyo Monthly, 22, 263-270. (in Japanese) Tan, Z.Y. & Chen, M.H. 1990. Some revisions of Pylonidae. Chinese J. Oceanol. Limnol., 8/2, 109-127. The three faces of the Pylonid are similar to one another but actually have obvious differences. Their similarities and obvious differences in dorsal. Iateral, and apical views are the criteria for the author in species identification and redefinition of the Subfamilies Diplozonaria and Triplozonaria (6 species in all) and description of 7 new species. Tipper, H.W. & Carter, E.S. 1990. Evidence for defining the Triassic-Jurassic boundary at Kennecott Point, Queen Charlotte Islands, British Columbia. Geol. Surv. Canada, curr. res., Pap., 90-1F, 37-41. At Kennecott Point in Queen Charlotte Islands, a minor discordance within sediments of the Sandilands Formation, Kunga Group is proposed as the Triassic-Jurassic boundary. Ammonites and radiolarians above the unconformity strongly indicate that the beds are earliest Hettangian in age; ammonites, conodonts, and radiolarians below the unconformity indicate that these beds are probably latest Triassic in age. Tominaga, R. 1990a. Jurassic accretionary prism of the northern part of the Chichibu Belt, eastern Shikoku. J. geol. Soc. Japan, 96/7, 505-522. (in Japanese) Geology of the Sawadani area, Eastern Shikoku, is described. And the province underlain by the Jurassic strata in the northern part of Chichibu Belt is redefined as an independent terrane based on the investigation in the Sawadani area. The Jurassic strata distributed in the Sawadani area are divided into three units, the Kenzan unit, the Higashiura unit and the Sawadani unit in ascending order. All boundaries of the units are thrust faults which dipped - 56 - south and were formed before the deposition of the Lower Cretaceous series over the Chichibu Belt. The Sawadani unit, which consists mainly of olistostromes with pelitic or psammitic matrices, is characterized by the occurrence of large amounts of greenstones, limestone and stratified serpentinite bodies associated with crystalline schists as olistoliths. The Higashiura unit is composed mainly of alternation of olistostromes with pelitic and psammitic matrices, and characteristically contains thick chert olistoliths associated with dolomite. The Kenzan unit also consists chiefly of olistostromes with pelitic matrices and abundant chert olistoliths, and contains intercalated acid tuff. Judging from radiolarian fossils obtained from the Sawadani area, the Sawadani, Higashiura, and Kenzan units are dated as early to middle Early Jurassic, middle to late Early Jurassic, and Middle Jurassic age, respectively. In the Sawadani area, these units show the following four regularities regarding the ages of the constituent rocks: (1) Whithin each unit, sedimentation took place in the order of limestone ⇒ chert ⇒ siliceous mudstone ⇒ mudstone. (2) Whithin each unit, there tends to be periods of overlapping sedimentation between limestone and chert, chert and siliceous mudstone, and siliceous mudstone and mudstone. (3) Of the same rock species, those in the lower unit are younger than those in the upper unit. (4) The rocks of the same kind in different units tend to have the overlapping periods of sedimentation. It is common among the accretionary prisms of other belts that constituent rocks have such regularities and that the unit boundaries are imbricated thrust faults. The model, which explains the regularity regarding the ages of the constituent rocks of the three units in the Sawadani area, illustrates the process of accumulation of the accretioary materials. Judging from the age polarity among the units, and from the content of the terigenous materials in each unit, the Sawadani unit, the Higashiura unit and the Kenzan unit are inferred to have accreted along the northern front of the land consisting mainly of the Kurosegawa rocks, during Early and Middle Jurassic time. Therefore, I propose to redefine the province, underlain by such Jurassic strata, as a terrane and to call the "Sawadani Terrane". Tominaga, R. 1990b. Tectonic development of the Chichibu belt, southwest Japan. J. Sci. Hiroshima Univ., Ser. C: Geol. Min., 9/2, 377-413. Tectonic development of the Chichibu belt, Southwest Japan was discussed in this paper. on the basis of analysis of tectonostratigraphic units and tectonic development of individual units of the Chichibu belt in Shikoku, clarifying following points. The Chichibu belt in Shikoku consists of three terranes, the Sawadani Terrane, the Kurosegawa Terrane and the Sambosan Terrane. The Sawadani Terrane is composed of three tectonostratigraphic units, which develop as nappes separated by southward dipping thrusts and show the northward younging age polarity. They in Eastern Shikoku correspond to the Sawadani unit of early to middle Early Jurassic time, Higashiura unit of middle to late Early Jurassic time and Kenzan unit of Middle Jurassic time in descending order, respectively. The Ohnogahara and Kanogawa nappes in Western Shikoku are correlated with the Sawadani and Higashiura nappes respectively. The ages of the constituent rocks of the nappes show following rules: (1) In each unit the age of the constituent rocks arrange in the order of limestone, chert, siliceous mudstone and mudstone from older to younger. (2) Each pair of limestone and chert, chert and siliceous mudstone and siliceous mudstone and mudstone of individual units tends to show the overlap of age. (3) The rocks of a kind in the lower unit are younger in age than those of the same kind in the upper unit. (4) The same sort of rocks in the different units tend to show the overlap of age. The Sawadani Terrane in Shikoku is defined as a belt occupied by Early to early Middle Jurassic accretionary prism formed along the northern (inner) front of the Kurosegawa Island-arc. The Kurosegawa Terrane is defined as a realm converted through Jurassic diastrophism from an older island-arc (Kurosegawa Island-arc), which consists of the Siluro-Devonian basement complex of continental crust type, Permo- Triassic continental shelf type sediments, Permo-Triassic accretionary prism etc. The Sambosan Terrane of the Hiradani- Shiraishi area, Eastern Shikoku, has been divided from north to south into the Torinosu Group and the A, B1, B2 and C tectonostratigraphic units. The A, B1, B2 and C units have lithological and chronological sequences regarded as accretionary prisms which show a younging age polarity from north to south. The Sambosan Terrane is defined as a belt which is occupied by Middle Jurassic to Early Cretaceous accretionary prism formed along the southern front of the Kurosegawa Terrane. Late Paleozoic to Mesozoic tectonic development of the Chichibu belt, Southwest Japan, is divided into nine stages. The initial structure of the Sawadani Terrane and the Sambosan Terrane were built up during the stages from 2 to 4 and the stages 5 to 7, respectively. And the diastrophism throughout the Chichibu belt had a climax at the change of the accretionary site from the northern (inner) side to the southern (outer) side across the Kurosegawa Terrane.
Radiolaria 14 Bibliography - 1990 Tumanda, F.P., Sato, T. & Sashida, K. 1990. Preliminary late Permian radiolarian biostratigraphy of the Busuanga Island, Palawan, Philippines. Annu. Rep. Inst. Geosci., Univ. Tsukuba, 16, 39-45. In the Philippines, Radiolaria have been used in establishing and checking its pre-Tertiary geology particularly in the North Palawan Block. Radiolaria were reported in the area and were used in the age determination of the rock units (Wolfart et al., 1986; Isozaki et al., 1988, Amiscaray and Tumanda, 1988; Cheng,1989). Although Cheng (1989) recognized 6 radiolarian assemblages, no concrete biostratigraphic work has been published yet. In a preliminary work reported by the senior author during the 1989 Geological Convention in the Philippines, 8 radiolarian assemblages were recognized. This paper presents the results of the paleontologic analyses of samples from the Permian sections in northern Mabintangin River, central Busuanga Island. It is part of the on-going detailed biostratigraphic study of the Island aimed at establishing radiolarian biostratigraphy to provide basic paleontologic control in deciphering the tectonic setting of the area. Umeda, M. 1990. Jurassic radiolarians associated with chert arenite in the western part of the Nanjo Massif, Fukui Prefecture, central Japan. Bull. Fukui municip. Mus. nat. Hist., 37, 7-19. (in Japanese) Vishnevskaya, V.S. 1990. Albian-Cenomanian radiolarians from northwestern Pacific Regions, a tool for Paleotectonic reconstruction. In: Geology of the Pacific. Eds.), vol. 2. Dokl. Akad. Nauk SSR., pp. 3-16. Vishnevskaya, V.S., Agarkov, Y.V., Zakariadze, G.S. & Sedaeva, K.M. 1990. Late Jurassic-Cretaceous radiolarians of the Greater Caucasus as a key for determination of age and paleoenvironment of the ophiolites from the Lesser Caucasus. Dokl. Akad. Nauk SSSR, 310/6, 1417. Wakamatsu, H., Sugiyama, K. & Furutani, H. 1990. Silurian and Devonian radiolarians from the Kurosegawa Tectonic Zone, southwest Japan. J. Earth Sci. Nagoya Univ., 37, 157-192. Well-preserved radiolarians are obtained from the Silurian and Devonian rocks of the Kurosegawa Tectonic Zone, Southwest Japan. On the basis of the existence of characteristic species, six assemblages are recognized. They are, the Secuicollacta ? exquisita assemblage (S. ? exquisita n. sp., S. ? sp. A, Goodbodium sp., Palaeoscenidium spp., etc.; late Llandoverian-Wenlockian), the Pseudospongoprunum tazukawaensis assemblage (P. tazukawaensis n. gen., n. sp., Secucollacta ? sp., Spumellaria gen. indet. spp., etc.; middle Wenlockian-middle Ludlovian), the Pseudospongoprunum sagittaturn assemblage (P. sagittatum n. gen., n. sp., P. ? sp., Haplentactinia sp., etc.; age unknown), the Devoniglansus unicus assemblage (D. unicus n. gen., n. sp., Copicyntra ? nuda n. sp., Helioentactinia ? prismspinosa n. sp., etc.; age and the stratigraphic relationship to the P. sagittaturn assemblage unknown), the Palaeoscenidium ishigai assemblage (P. ishigai n. sp., Deflantrica solidum n. gen., n. sp., Ceratoikiscum Iyratum, etc.; Middle Devonian) and the Tlecerina-Glanta assemblage (T. horrida, T. exilis, G. fragilis n. gen., n. sp., Pactarentinia holdsworthi, Helenifore sp., etc.; Middle Devonian), in ascending order. Component species of these assemblages are fairly different from those of previously known Silurian and Devonian faunas of other districts, which may be caused by the difference of age and/or paleoenvironment. Four new genera, Deflantrica, Pseudospongoprunum, Devoniglansus and Glanta, are proposed and eleven new species and seventeen indeterminable species are described. Watanabe, Y., Asano, H., Ino, M., Kitamura, E., Takahashi, O., Mashiko, S., Miyachi, T. & Ishii, A. 1990. Occurrence of Late Cretaceous fossils from the Tochiya Formation, northeastern part of the Kanto Mountains, central Japan. J. geol. Soc. Japan, 96/8, 683- 685. (in Japanese) Welling, L.A. 1990. Radiolarian microfauna in the Northern California current system: spatial and temporal variability and implications for paleoceanographic - 57 - reconstructions. M. Sci. Thesis. Oregon State University, Corvallis, Oregon, 80 p. (unpublished) Yamashita, M. & Ishiga, H. 1990. Correlation between the radiolarian and the fusulinacean biostratigraphy of the Upper Middle Permian in Atetsu Plateau, Okayama Prefecture, Southwest Japan. J. geol. Soc. Japan, 96, 687- 689. (in Japanese) Yang, Q. & Wang, Y.J. 1990. A taxonomic study of Upper Jurassic radiolarian from Rutog county, Xizang (Tibet). Acta micropalaeont. sinica, 7/3, 195-218. A diversified radiolarian fauna from a chert sample of a primarily basic volcanic succession, locally known as the "Muggarkangri Group", in Rutog County, NW Xizang (Tibet), contains 15 families, 32 genera, and 54 species-level taxa. One new family (Leugeonidae), three new genera (Dantze, Leugeo, and Levileugeo), and 12 new species are erected herein. This radiolarian assemblage is assignable to Upper Kimmeridgian/Lower Tithonian (Subzone 2 alpha to Subzone 3 beta of Pessagno et al., 1987b)~ based on the presence of Mirifusus guadalupensis, Tripocyclia jonesi, Hsuum maxwelli, etc. Yao, A. 1990. Triassic and Jurassic radiolarians. In: Pre- Cretaceous Terranes of Japan. Publication of IGCP Project No. 224: Pre-Jurassic Evolution of Eastern Asia. (Ichikawa, K., Mizutani, S., Hara, I., Hada, S. & Yao, A., Eds.). IGCP Project 224, Osaka, Japan. pp. 329-345. Triassic and Jurassic radiolarians are abundantly contained in siliceous and fine-grained clastic rocks of the Mesozoic sedimentary complexes of the B terrane-group (Ichikawa et al., 1985) that is the Jurassic-earliest Cretaceous terranes. Research on these radiolarians has recently played an important role in reexamination of "Upper Paleozoic" and Mesozoic stratigraphy and tectonic history of Japan. As important results, it is revealed that the B terranegroup is composed mainly of Mesozoic sedimentary complexes which for a long time were believed to be the Upper Paleozoic, and that the complexes are mostly the product of tectonic and/or sedimentary mixture of rocks of different ages. Moreover, it is clarified that the complexes are generally classified into three kinds of sequences, namely chert-clastics sequence, olistostromal sequence and clastic orderly sequence as cover sediments (cf. Matsuoka and Yao, in this book). In this paper, the author firstly reviews the brief history of Triassic and Jurassic radiolarian researches in Japan, secondly summarizes the recent results on the radiolarian biostratigraphy, thirdly correlates the Japanese zones with foreign ones, and finally remarks on the Triassic and Jurassic radiolarian paleobiogeography. Yeh, K.Y. 1990. Taxonomic studies of Triassic Radiolaria from Busuanga Island, Philippines. Bull. natl. Mus. nat. Sci., Taiwan, 2, 1-63. Bedded chert in Busuanga Island often contains abundant and highly diversified Radiolaria. This report deals with taxonomic studies of Middle and Upper Triassic Radiolaria from a bedded chert section near San Nicolas, Busuanga Island, Philippines. Three radiolarian assemblages can be distinguished from the studied samples. These assemblages are Ladinian Busuanga chengi Assemblage, Carnian Trialatus megacornutus Assemblage, and upper Norian Livarella sp. A Assemblage. In this study over one hundred and fifty radiolarian forms are figured, two new genera and fifteen new species are described. Yeh, K.Y. & Nien, C.Y. 1990. Radiolaria in surface sediments from marginal basin off southwest Taiwan. Bull. natl. Mus. nat. Sci., Taiwan, 2, 65-87. Radiolarian faunas were analyzed for the surface sediments from the basin to the southwest of Taiwan. In this study, the occurrence of radiolarian faunas shows that 1) Radiolaria occurs from shallow coastal environment to the deep area; 2) the abundance and diversity of Radiolaria in the sediments are mainly controlled by the depth; the diversity of radiolarian assemblage increases with increasing depth. Radiolarian assemblages in the sediments may indicate the variation of water masses of past. A preliminary test shows that during the deposition of these surface sediments, the water column of deep area consisted of at least three water masses; the boundaries of upper three water masses were possibly around the depths at 130 and 300 meters, respectively.
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