radiolaria - Marum

Radiolaria 14 Bibliography - 1989
Yamauchi, M. 1989. Radiolarian assemblage in JT-01
sediment trap sample. Kaiyo Monthly, 21/4, 203-208.
Yang, Q. & Pessagno, E.A. 1989. Upper Tithonian
Vallupinae (Radiolaria) from the Taman Formation, eastcentral
Mexico. Micropaleontology, 32/2, 114-134.
The pantanelliid subfamily Vallupinae Pessagno and MacLeod
reached its acme of development during the late Tithonian. Two new
genera (Neovallupus and Supervallupus) and seven new species are
described from the upper Tithonian portion of the Taman Formation,
east-central Mexico; new species are Bivallupus oppositus, B.
primigenus, Neovallupus dumitricai, N. modestus, Protovallupus
excellens, Supervallupus haeckeli, and Vallupus laxus. In addition,
the definition of the subfamily Vallupinae is emended. Many taxa
belonging to the Vallupinae are short-ranging, distinctive, and
cosmopolitan—occurring in both Boreal and Tethyan strata.
Vallupinid taxa have proven to be useful in developing a meaningful
radiolarian zonation for the upper Tithonian of North America.
Yao, A. 1989. Paleozoic and Mesozoic radiolarian fossils
from Japan (Triassic 1-3). Atlas of Japanese fossils, 66, 1-
12. (in Japanese)
Yasuda, M. 1989. Equivalents to the Torinosu Group of the
Chichibu Belt in the southeastern part of the Kanto
Mountans, central Japan; lithology and radiolarian
biostratigraphy. J. geol. Soc. Japan, 95/6, 463-478. (in
Japanese)
Mesozoic sedimentary complexes of middle and southern
Chichibu Belt in the southeastern part of the Kanto Mountains are
composed of three types of strata, namely, (1) chert-clastics
strata, (2) chaotic strata and (3) clastics with limestone strata (the
equivalent to the Torinosu Group). In this paper, the strata of type
(3) in the area is described, and further the age by radiolarian
remains and its geological significance are discussed.
The equivalents of the Torinosu Group in the area are the
Itsukaichi Formation (lower-upper Middle Jurassic), the Kowada
Formation (lower Upper-Jurassic) and the Hikawa Formation (middle
Upper Jurassic-Lower Cretaceous: Akaisawa area; Lower
Cretaceous: Hinatagayato area; lower-upper Upper Jurassic).
Commonly, these formations consist mainly of terrigenous
clastics mudstone, sandstone, alternation of sandstone and
mudstone, rarely conglomerate) and limestone (Torinosu-type) not
including other allochthonous or older blocks. The Itsukaichi and
Hikawa (Akaisawa area) Formations show stratigraphic change of
radiolarian assemblage. So these strata are regarded as normally
accumulated sediments of clastics, having little processes of mixing
and reconstruction. Judging from the relative position of
contemporaneous heterotopic facies formations, depositional site of
these strata was situated at the northeastern side of those of chertclastics
and chaotic strata.
Abelmann, A. 1990. Oligocene to Middle Miocene
radiolarian stratigraphy of southern high latitudes from Leg
113, sites 689, and 690, Maud Rise. In: Proceedings of the
Ocean Drilling Program, Scientific Results. (Baker, P.F.,
Kennett, J.P. et al., Eds.), vol. 113. College Station, TX
(Ocean Drilling Program), pp. 675-708.
At Sites 689 and 690, drilled during ODP (Ocean Drilling
Program) Leg 113 on the Maud Rise (southeast Weddell Sea),
moderately to well preserved radiolarian assemblages were obtained
from continuously recovered upper Oligocene and Neogene
sequences. Based on radiolarian investigations, a biostratigraphic
zonation for a time interval covering the late Oligocene to the middle
Miocene is proposed. The radiolarian zonation comprises 10 zones.
Five zones are new, and five zones previously defined by Chen
(1975) were modified. The zones and the ranges of the nominate
species are directly calibrated with a geomagnetic polarity record.
This is the first attempt at a direct correlation of late Oligocene to
middle Miocene radiolarian zones with the geomagnetic time scale.
Six hiatuses were delineated in the studied upper Oligocene to middle
Miocene sections. One major hiatus, spanning ca. 6 m.y., is between
the upper Oligocene and the lower Miocene sequences. Another
important hiatus separates the lower and middle Miocene sediments.
As a base for the biostratigraphic investigations, a detailed
taxonomic study of the recovered radiolarian taxa is achieved. Three
new radiolarian species that occur in upper Oligocene and lower
Miocene sediments are described (Cycladophora antiqua,
Cyrtocapsella robusta, and Velicucullus altus).
1990
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Yeh, K.Y. 1989. Studies of Radiolaria from Fields Creek
Formation, east-central Oregon, U.S.A. Bull. natl. Mus. nat.
Sci., Taiwan, 1, 43-109.
From the Fields Creek Formation, east-central Oregon, four
major radiolarian assemblages were recovered, they are the Ladinian
Pseudostylosphaera magnispinosa Assemblage, Karnian Poulpus
karnicus Assemblage, Norian Corum parvum Assemblage, and an
upper Norian or Hettangian fauna of Orbiculiform sp. A Assemblage.
Characteristic species of each assemblage and other distinct
radiolarian taxa including twenty three new species and four new
genera are figured and described in this report. The results of this
study indicate that (1) the Fields Creek Formation was mainly
deposited during Norian times, but the deposition of the Fields Creek
sediment may have initiated from Ladinian times, or (2) the rocks
contain Ladinian or Karnian Radiolaria represent the allochthonous
blocks in the Fields Creek olistostromes.
Zagorcev, I., Boyanov, I. & Tikhomirova, L.B.
1989. Correlation of Jurassic sections from SW Bulgaria and
eastern Rhodopes by radiolarians complex. In: XIV Congress
CBGA, abstracts. Eds.). Sofia, Bulgaria. pp. 795-798. (in
Russian)
Zagorcev, I., Mavridis, A., Budurov, K.,
Tikhomirova, L.B., Trifonova, E., Scourtsis-
Coroneou, V. & Manacos, C. 1989. New stratigraphic
data on Lower Drimos Limestones (Upper Triassic) from the
section of Karpenission, Pindos-Olonos Zone (Eurytania,
Greece). Geol. balcan., 19/5, 3-14.
The uppermost parts of the Lower Drirnos Iimestones from the
section at Karpenission contain rich conodont assemblage
corresponding to the middle parts of the Sevatian Epigondolella
bidentata Range Zone It is dominated by the species Misikella
posthernsteini Kozur & Mock and Paragondella steinbergenses
Mosher, and contains the new conodont species Epigondonella
postspatulata Budurov & Mavridis. A rich radiolarian complex has
been found too, it contains specific Upper Triassic taxa belonging to
Spumellaria and Nassellarian including representatives of
superfamily Archocyrtoidea. The foraminiferal assemblage is
characterised also by taxa typical of the Upper Triassic. Red cherts
from the base of the overlying cherty interval contain a radiolarian
complex of l ate Norian—Rhaetian age.
Zhang, Q., Mizutani, S., Kojima, S. & Shao, J.
1989. The Nadanhada Terrane in Heilongjiang Province.
Geological Review, 35/1, 67-71. (in Chinese)
Zhu, G. 1989. Diet analysis of Antarctic krill Euphausia
superba Dana. Acta Oceanol. sinica, 8/3, 457-462.
Afanasieva, M.S. 1990a. Experimental evidence for
changes during fossilization of radiolarian tests and
implications for a model of biomineralization. Mar.
Micropaleontol., 15/3-4, 233-248.
This paper contains informations of two kinds: (1) observation
on the effects of high-temperatures annealing on the organization of
opaline radiolarian test that may simulate fossilization processes
and (2) an hypothetical model for the processes of formation,
preservation and destruction of radiolarian shells in geologic history,
based on diverse published reports and observations of heat-treated
skeletons. Biomineralization of radiolarian skeletons start with an
appearance of some primary amorphous opal globules E (0.06-0.15
µm) on the hexagonal polysaccharide plates of the organic matrix.
The finest globules E are grouped together, forming the globule units
D (0.2-03 µm), which, in their turn, are united into a globule unit C
(0.4-1 µm) .The globule units C are grouped into the hexagonal
prismatic units B (1-3 µm) . The largest mineral units A (3-8 µm) are
formed from the units B and pass throughout the whole shell wall.
Besides that, every ultrastructural skeleton unit is surrounded by
organic lamella. Therefore, the main tenement of biomineralization is
corroborated: the existence of any skeleton as a single solid body is
provided by the interactions of all ultrastructural skeleton elements
through the unmineralized residual organic matrix.
A common trend in the fossilization of skeletons is (1)
destruction of the covering organic lamellae accompanied by
disintegration of skeletons and (2) carbonization (tannage) of the
residual organic matrix increasing a skeleton strength and silica