radiolaria - Marum

Radiolaria 14 Bibliography - 1991
scales. The Middle Jurassic radiolarian complex is typical of
relatively shallow-water conditions, while the Late Jurassic, typically
Tethyan complex is characteristic of an open pelagic zone.
Wang, Y.J. 1991. On progress in the study of Paleozoic
radiolarians in China. Acta micropalaeont. sinica, 8/3, 237-
251. (in Chinese)
The study of Paleozoic radiolarians in China has been much
improved ever since the publication of the first paper on Paleozoic
Radiolaria in 1982(Sheng & Wang, 1982, in Chinese) with
radiolarian faunas ranging from Ordovician to Permian discovered in
many localities. This paper gives a summary of the progress in the
study of Paleozoic radiolarians during the last 10 years. All the
materials used in this paper have not been published unless
otherwise stated.
Widz, D. 1991. Les Radiolaires du Jurassique supérieur des
radiolarites de la zone des Klippes de Pieniny (Carpathes
occidentales, Pologne). Rev. Micropaléont., 34/3, 231-260.
About one hundred radiolarian species have been found in forty
three samples from radiolarites of the Pieniny Klippen Belt. For some
species short descriptions or taxonomic remarks are given. The
examination of the fauna allowed to identify the following Upper
Jurassic Unitary Associations: U.A.7-8 (Oxfordian), U.A.8 (Upper
Oxfordian) U.A.8-9 (Upper Oxfordian-Kimmeridgian). U.A.9
(Kimmeridgian). In most cases these biostratigraphical results are in
agreement with previous age-determination of these strata by
aptychi.
Yamashita, M., Ishida, K., Yamaoka, Y., Goto,
H. & Ishiga, H. 1991. P/T boundary occurs in the "Toishi
type" shale of southwest Japan. Appendix: Early Triassic
radiolarians. Geol. Rep. Shimane Univ., 10, 47-52. (in
Japanese)
Yang, Q. 1991. Paleobiogeographic analysis of Jurassic
Radiolaria. In: Palaeocology of China. (Jin, Y., Wang, J. &
Xu, S., Eds.), vol. 1. pp. 233-248.
Paleobiogeographic studies on Mesozoic Radiolaria are still in
their infancy. Pessagno et al. distinguished the Tethyan and Boreal
Faunal Realms which are further subdivided into four faunal
provinces for Late Triassic and Jurassic Radiolaria. Their studies in
North America together with Mizutani and Kojima's studies in East
Asia on radiolarian paleobiogeography have proved to be useful in
tectonic investigations. The present study analyzes some of the
important issues in radiolarian paleobiogeographic studies and
proposes an East Tethyan and a West Tethyan radiolarian province
for the Jurassic. The difference between the East Tethyan and West
Tethyan radiolarian assemblages is revealed by the fact that two
different radiolarian zonations of Pessagno et al. and Baumgartner
for North America and the Mediterranean areas respectively are
currently in parallel use. The East Tethyan province for Jurassic
Radiolaria comprises Japan, China, Oman, Turkey, Greece, Italy,
Switzerland and 'North Atlantic (DSDP sites), insofar as known, while
the West Tethyan province includes east-central Mexico, California,
Oregon, western Canada and probably Argentina. Such a faunal
differentiation is a result of preliminary investigation and should be
subjected to testing by more data from radiolarian and other fossil
groups and tectonic-paleooceanographic investigations.
Abelmann, A. 1992a. Early to Middle Miocene radiolarian
stratigraphy of the Kerguelen Plateau, Leg 120. In:
Proceedings of the Ocean Drilling Program, Scientific
Results. (Wise, S.W.J., Schlich, R. et al., Eds.), vol. 120.
College Station, TX (Ocean Drilling Program), pp. 757-783.
Early to middle Miocene radiolarian assemblages were examined
at three sites (747, 748, and 751) that were cored during Ocean
Drilling Program Leg 120 south of the present polar frontal zone on
the Kerguelen Plateau (Indian sector of the Southern Ocean). The
radiolarian biostratigraphic study relies on a radiolarian zonation
recently developed on Leg 113 materials in the Atlantic sector of
the Southern Ocean, which is correlated with the geomagnetic time
scale. New radiolarian biostratigraphic data also considering the
established geomagnetic polarity record were used to improve and
emend the age calibration of some lower Miocene radiolarian zones
and a redefined middle Miocene radiolarian zonation is proposed.
Based on these results, a revised age assignment of the lower
Miocene sections drilled at Leg 113 Sites 689 and 690 is proposed.
1992
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Yang, Q. & Mizutani, S. 1991. Radiolaria from the
Nadanhada Terrane, Northeast China. J. Earth Sci. Nagoya
Univ., 38, 49-78.
The Nadanhada Terrane located in the northeastern part of
Heilongjiang Province, northeast China, is correlative to the Mino
Terrane of Japan. The geologic and biostratigraphic studies have
been done particularly in terms of terrane analysis, and the
Mesozoic tectonics of the western Pacific has been discussed on the
basis of these study results. This paper outlines the geology and
biostratigraphy of the Nadanhada Terrane and presents new data of
radiolarian micropaleontology. Abundant and diversified
parasaturnalids associated with other groups of Radiolaria were
discovered from Upper Triassic and Lower Jurassic strata of the
Nadanhada Terrane. Fourteen species-level taxa under six genera of
the Parasaturnalidae are illustrated in this paper, including five new
species (Praemesosaturnalis heilongjiangensis, Pseudoheliodiscus
rotundus, Saturnosphaera shengi, Saturnosphaera zhangi, and
Stauracanthocircus nadanhadaensis).
The parasaturnalids from the Triassic-Jurassic transitional
strata in the Nadanhada Terrane show significant morphological
changes from latest Triassic to earliest Jurassic times. Notably Late
Triassic parasaturnalids have a broader peripheral ring and mostly
possess auxiliary rays or more than two undifferentiated rays; on
the other hand, in the lowermost Jurassic occurs abundant
Palaeosaturnalis Donofrio and Mostler sensu Kozur and Mostler;
some species of Palaeosaturnalis are distinctive for lowermost
Jurassic, such as P. Iiassicus Kozur and Mostler, P. Ienggriesensis K.
& M. and their related forms; the earliest Jurassic parasaturnalids
commonly possess a narrow peripheral ring, and species with
auxiliary rays or more than two undifferentiated rays are less
abundant. This study indicates that the parasaturnalids, together
with other radiolarian groups, may be used as good markers for
identifying Upper Triassic and Lower Jurassic strata and have a
great potential for determining the T/J boundary.
Based on the new data and on a selected set of morphological
criteria, one of the authors (Q. Yang) intends to propose a revised
classification of the Mesozoic ring-type Radiolaria in order to
simplify the taxonomy. Revised parasaturnalid genera now include
Acanthocircus (incl. synonyms Eospongosaturnalis, Hexasaturnalis,
Spongosaturnalis and Spongosaturninus), Heliosaturnalis,
Mesosaturnalis (incl. Pseudacanthocircus), Palaeosaturnalis (incl.
Praehexasaturnalis and Spinoellipsella), Praemesosaturnalis,
Pseudoheliodiscus (incl. Liassosaturnalis, Octosaturnalis and
Pessagnosaturnalis), Saturnosphaera (incl. Praeacanthocircus,
Stauromesosaturnalis and Triacanthocircus), Stauracanthocircus,
Yaosaturnalis (incl. Kozurastrum), and multiple-ringed genera such
as Japonisaturnalis, Parasaturnalis and Pseudosaturnalis.
Yao, A. 1991a. Prospects in biochronology: A comment
from the viewpoint of Mesozoic radiolarian chronology. In:
Problems and prospects of paleontology in 21st century;
reports on 1991 annual meeting of the Paleontological
Society of Japan. Eds.), vol. 50. Fossils, pp. 8-9. (in
Japanese)
Yao, A. 1991b. Occurrence of Paleozoic radiolarians from
eastern inner Mongolia. In: Pre-Jurassic Geology of Inner
Mongolia, China. (Ishii, K., Liu, X., Ichikawa, K. & Huang,
B., Eds.). Report of China-Japan Cooperative Research
Group, pp. 175-187.
Abelmann, A. 1992b. Radiolarian flux in the Antarctic
waters (Drake Passage, Powell Basin, Bransfield Strait). Polar
Biol., 12, 357-372.
The study of radiolarians collected during sediment trap
experiments in the Drake Passage, the northern Powell Basin, and the
King George Basin of the Bransfield Strait provides new information
on the flux rates of radiolarian shells in Antarctic waters, on the
annual flux pattern, the species distribution and its ecological
significance, and on alteration processes of the radiolarian shells in
the water column and at the sediment/water interface. A 28-month
monitoring with time-series sediment traps in the Bransfield Strait
indicates an annual flux pattern characterized by short-term flux
pulses during austral summer, which reach daily flux rates of up to 5
x 10 3 shells m -2 and account for more than 90 % of the total annual
flux. The distinct seasonal variations are linked to variations In the
sea Ice coverage. Other controlling factors are the production of
phytoplankton and the Impact by zooplankton grazers, e. g. the krill.
The vertical flux rates of radiolarians of the summer flux pulses