radiolaria - Marum

Radiolaria 14 Bibliography - 1993
Hole 438A of the mid- to high-latitutde NW Pacific. N. Osaka
Micropaleont. spec. Vol., 9, 337-347. (in Japanese)
Nagai, H. & Mizutani, S. 1993. Early Triassic
radiolarians from Tsuzuya, Minokamo City, Gifu Prefecture,
central Japan. Bull. Nagoya Univ. Furukawa Mus., 9, 1-23.
(in Japanese)
Early Triassic radiolarians extracted from bedded chert
exposed at Tsuzuya (Minokamo City, Gifu Prefecture) in the Mino
terrane are briefly described. They are partly correlative with those
of the Parentactinia nakatsugawaensis (Pn) assemblage of Sugiyama
(1992) and are supposed to be Spathian in age. In the study area,
this Spathian part of chert seems to be successively overlain by the
Anisian and younger chert; but no older or lower part is exposed. The
chert formation changes abruptly to sandstone of the clastic facies
to an apparently lower direction. The occurrence of the Spathian
radiolarians in this area suggests that the early Triassic bedded
chert is rather common as has been pointed out so far by the
paleontological evidence of conodont. The Triassic chert formation in
the Mino terrane is discussed from the radiolarian biostratigraphic
point of view.
Nazarov, B.B. & Ormiston, A.R. 1993. New
biostratigraphically important Paleozoic Radiolaria of
Eurasia and North America. In: Radiolaria of giant and
subgiant fields in Asia. Nazarov Memorial Volume. (Blueford,
J.R. & Murchey, B.L., Eds.), Micropaleontology, special
Publication vol. 6. Micropaleontology Press, American
Museum of Natural History, New York. pp. 22-60.
In previous publications by the authors (Nazarov and Ormiston
1985a, 1985b, 1986). a scheme for the temporal succession and
distribution of twenty-seven radiolarian assemblages (Cambrian to
Permian) was introduced as a means for biostratigraphic subdivision
of the Paleozoic using radiolarians. Among the component species of
these assemblages, radiolarians of the Late Carboniferous to
Permian are more completely described, whereas older ones remain
insufficiently characterized. There are many radiolarian species
from the Ordovician to Middle Carboniferous which have
biostratigraphic importance but have not been described. To fill that
need, two new genera, Haplotaeniatum, and Aciferopylorum, and
thirty-three new species are described, and four species are
redescribed from the lower and middle Paleozoic. In addition, four
new polycystine species are described from the Lower Permian of
the southern Urals and western Texas. The diagnosis of Meschedea
(Won 1983) is modified and augmented. Range charts are provided
for Ordovician, Silurian, Devonian, Mississippian and latest
Carboniferous to earliest Permian radiolarians.
Nishimura, A. 1993. Nazarov, Boris B. (1988): Paleozoic
Radiolaria. Practical manual of microfauna of the USSR,
Leningrad "Nedra" vol. 2, 232p. N. Osaka Micropaleont.
spec. Vol., 9, 365-377. (in Japanese)
Nishimura, H., Kawata, T. & Ogawa, Y. 1993.
Microfabrics of Deep Sea Bottom Sediment Collected by
Research Dive 134 of "Shinkai 6500". Proc. JAMSTEC
Symp. Deep Sea Res., 9, 49-64. (in Japanese)
Deep sea bottom and fissure sediment was sampled by
Research Dive 134 of "Shinkai 6500" in the oceanward slope of the
Japan trench. The primary objective of the study was to examine the
contents of three samples of Recent biogenic sediment with a
scanning electron microscope. Our observation clarified that the
samples consist mainly of Recent diatom shells, Tertiary and Recent
radiolarians, silicoflagellates, foraminifers and Tertiary coccoliths,
sponge spicules, and clay minerals. The geological age indicated by
fossils, the state of preservation, arrangements of Recent shells and
spicules, and composition of their fillings, suggest that flocculated
solitary planktonic shells and colonial phyto- and zoo-planktons sank
from the oceanic surface layer and accumulated on the bottom at
the same time as the arrival of derived Tertiary and Recent
sediment.
The secondary objective was to classify the microfabrics in
three core samples. An approach to microfabric characterization
based on the size of grains and particles, arrangement of grains and
assemblages, and size and form of pore-spaces has been presented
to accommodate the depositional environments in the deep sea and
the relationship between diagenetic effect (especially compaction)
and depth in bottom sediment.
Ogawa, Y. 1993. Destruction and dissolution of radiolarian
test in relation to the present and ancient decollement zones,
Barbados accretionary compley, Ocean Drilling Program Leg
- 101 -
110. Sci. Rep. Inst. Geosci., Univ. Tsukuba, Sect. B: geol.
Sci., 14, 53-64.
Radiolarian preservation states related to mechanical
destruction and chemical dissolution of samples from Ocean Drilling
Program Leg 1 10, the Barbados accretionary complex. are observed
by using SEM photographs, and are classified into four grades. The
first is almost intact, and the second is structurally fragmented. The
latter group results from slight shearing in the imbricate thrust part
or in the deeper part in front of the deformation front. The third
preservation grade is defined by chemical dissolution chiefly
observed near the thrust faults or along the decollement zone. The
fourth grade is of strong shearing characterized by striated
foliation. This is only seen in samples of the present and plausible
ancient decollement zones. The ancient decollement zone is
interpreted to be uplifted in the accretionary complex by
underplating.
Okamoto, S. 1993. Radiolarian fossils obtained from the
Cretaceous Miyama Complex of the Shimanto Belt in the
western part of the Kii Peninsula. N. Osaka Micropaleont.
spec. Vol., 9, 205-214. (in Japanese)
Ondrejickowa, A., Borza, V., Korabova, K. &
Michalik, J. 1993. Calpionellid, radiolarian and
calcareous nannoplankton association near the Jurassic-
Cretaceous boundary (Hrusove section, Cachticke Karpaty
Mts., western Carpathians). Geologica carpath., 44/3, 177-
188.
The article presents the results of a biostratigraphic study
based on the distribution and joint occurrences of calpionellids,
radiolarians and calcareous nannoplankton, in a time section around
the Jurassic-Cretaceous boundary in the Hrusove section of the
Cachticke Karpaty Mts. The results gained show that the boundaries
of biozones established on the basis of studies of the above
mentioned groups of micro- and nannoplankton are not
synchronnous. The association of radiolarians (U.A.11) and
calcareous nannoplankton (zonee CC1 Nannoconus steinmanii
occurs in the uppermost Tithonian, below the boundary of the
calpionellid zones Crasicolaria/Calpionella, which in the conception
of Remane et al. (1986) corresponds to the Tithonian-Berriasian
boundary.
Ormiston, A.R. 1993a. Dedication: Dr. Boris Borisovich
Nazarov (1937-1989). In: Radiolaria of giant and subgiant
fields in Asia. Nazarov Memorial Volume. (Blueford, J.R. &
Murchey, B.L., Eds.), Micropaleontology, special
Publication vol. 6. Micropaleontology Press, American
Museum of Natural History, New York. pp. 1-2.
Ormiston, A.R. 1993b. The association of radiolarians
with hydrocarbon source rocks. In: Radiolaria of giant and
subgiant fields in Asia. Nazarov Memorial Volume. (Blueford,
J.R. & Murchey, B.L., Eds.), Micropaleontology, special
Publication vol. 6. Micropaleontology Press, American
Museum of Natural History, New York. pp. 9-16.
As the only planktic group commonly recovered from deposits
of all Phanerozoic systems, radiolarians have special significance in
discriminating deep basinal or oceanic marine environments of
deposition through time. Assuming radiolarian planktic habit has
changed little since the Ordovician, they can be used for
comparative environmental analysis for much of the Phanerozoic.
This approach must be tempered by the realization that there is
probably much yet to learn about the details of environmental
response of pre-Mesozoic radiolarians. Radiolaria were clearly not
the dominant planktic group throughout the Phanerozoic. However,
their consistent association with other planktic organisms in the
stratigraphic record and their association with facies inferred to be
deeper-water validates their cautious use as indicators of distal
basinal or oceanic environments from the Ordovician to the present.
As such environments are often optimal sites for the preservation of
abundant lipid-rich, organic material largely derived from
phytoplankton, radiolarians are commonly associated with riche
marine hydrocarbon source rocks irrespective of their age within the
Phanerozoic. Other equally rich source rocks that are of nonmarine
origin do not, of course, contain radiolarians. In addition to being
associated with environmental settings favorable to the accretion
and preservation of organic-rich sediments, radiolarians themselves
may have been significant contributors to the ultimately preserved
petroleum precursors, because certain living radiolarians are known
to contain high levels of lipid material. Thus, Radiolaria may have had
both environmental and some measure of causative association with
the accumulation of organic-rich rocks which have the potential to
become source rocks for hydrocarbons through most of the
Phanerozoic.