News of Osaka Micropaleontologists (NOM), Special Volume, no. 14, p. 523 – 531, Feb., 2009© Editorial Committee of NOM

Late Permian Albaillellaria (Radiolaria) from a nodule in the boundary part between Northern Chichibu and Kurosegawa Belts in central Shikoku, Japan

YAMAKITA Satoshi1)

1) Department of Earth and Space Sciences, Faculty of Education and Culture, The University of Miyazaki, Miyazaki 889-2192, Japan

(2007 4 4 2007 5 2 2007 7 27 )

Abstract

523

ISSN 0287– 0436

Key words: Late Permian, Albaillellaria, nodule, Neoalbaillella ornithoformis Assemblage Zone, Albaillella levis

Abundance Zone, Northern Chichibu Belt, Kurosegawa Belt

����������������� �������� �� �� ������ �� ��������� ������������������������������ ������������������� �����������the boundary part between the Northern Chichibu and Kurosegawa Belts in central Shikoku were reexamined, and 6 species (Neoalbaillella optima, N. ornithoformis, Albaillella levis, A. angusta, ������� and Follicucullus scholasticus) ��������������!��A. levis was the dominant species in Albaillella. Such a faunal composition suggested that this fauna is correlated with that of the upper part of the N. ornithoformis Assemblage Zone or the uppermost part of the A. levis Abundance Zone. The age of this fauna is regarded as early Changhsingian (late Late Permian).

はじめに

Takemura 1986 1997

1993

Yamakita 1988

Albaillellaria

Shikoku

M T L34� N

33� N

133� E

134� E

Fig. 2

Northern Chichibu Belt (Including Mikabu Greenstone)

Southern Chichibu Belt

Kurosegawa Belt

0 50 km

Fig. 1. Index map.

524

産出地点周辺の地質状況

1.5km

Figs. 1, 2 and 3 Yamakita 1988

Loc. C-67

10cm

1985

Fig. 21983 1986

Follicucullus scholasticus Follicucullus ventricosus Neoalbaillella ornithoformis

1983

1985 1986

Yamakita 1988

km

1985 1986

Yamakita 1988

1998

1982

1998

2000

1983 1985 1986

Yamakita 1988

0 5 km

N

Kochi

Tosa-yamada

Shogase

Fig. 3

133�30' E

33�35' N

Tosayama

Kurosegawa Belt

Northern Chichibu Belt

Northern Chichibu Belt

Sawadani Formation

Cretaceous strata (typical Monobegawa Group)

Sumaizuku Formation

Kamiyoshida Formation

Yusukawa Formation

Shingai Formation

Kurosegawa BeltCretaceous strata (Monobegawa-Nankai transitional type)

Jurassic (?) chaotic rocks

Permian (?) and Triassic clastic rocks

Ino Formation

Pre-Caroboniferous rocks

Serpentinite

Ino

"�#!�$!�%���������#����#���� �����&��������'��������*���� ���+����# � �*�������/���;� � � � � �� <������ ��%��=�=�!

525

1998

1980 1990

1985 Hada and Kurimoto 1990 Yoshikura et al. 1990

1990 1991 1992

1998

300 km100 300

Fig. 3

Maruyama 1981

200 Fig. 3

Sumaizuku Formation Shingai Formation

Serpentinite Ino Formationsandstone

mixed rock

chert

greenstone

green schist

serpentinite

0 1 km

Kagami-dam

nodule locality

Engyoji

N

133�30' E

33�36' N

Kagam

i River

Fig. 3. Route map around the locality of the nodule.

526

1998

1998

試料の処理

10

60 200

Neoalbaillellawing Albaillella H-frame

1993

1993

Yamakita 1988

100

放散虫化石

AlbaillellariaNeoalbaillella optima Ishiga, Kito and Imoto

Neoalbaillella ornithoformis Takemura and Nakaseko Albaillella levis Ishiga, Kito and Imoto Albaillella angusta Kuwahara Albail lel la f le�a KuwaharaFollicucullus scholasticus Ormiston and Babcock

Plate 1 Table 1Yamakita 1988 Albaillella

triangularis Ishiga, Kito and Imoto Albaillella e�celsa Kito and Imoto

transverse band A. triangularisPlate 1, �g. 15 A. triangularis

ventral wingKuwahara and Sakamoto 1992

ventral 40

A. �e�aA. e�celsa Plate 1, �gs. 13-14

A. e�celsa ventral wing

Ishiga et al. 1982a Kuwahara and Sakamoto 1992

Kuwahara 1997b ventral wing

2.5 transverse band A. angusta

.

ノジュールの地質時代

Ishiga et al. 1982bIshiga 1986

1980

1997a N.

Neoalbaillella optima Ishiga, Kito and Imoto 20Neoalbaillella ornithoformis Takemura and Nakaseko 7Albaillella levis Ishiga, Kito and Imoto 24Albaillella angusta Kuwahara 3Albaillella flexa Kuwahara 2Follicucullus scholasticus Ormiston and Babcock 1

Total 57

Table 1. Numbers of albaillellarian specimens obtained from the nodule.

527

ornithoformis N. optima

Kuwahara et al.1998

1997aKuwahara et al. 1998

Ishiga et al. 1982a 1997a

N. ornithoformis N. ornithoformis

N. optima N. ornithoformis N. optima Ishiga et al. 1982bKuwahara et al. 1998 A. levis N. ornithoformis

N. optimaKuwahara et al. 1998 Kuwahara 1999 A.

angusta N. ornithoformis N. optimaKuwahara 1999 A. �e�a

N. ornithoformis N. optimaKuwahara

et al. 1998 Kuwahara 1999 F. scholasticus F. scholasticus – F. ventricosus N. ornithoformis

Kuwahara et al. 1998 N. optima

Kuwahara et al. 1998 Kuwahara 1999 A. triangularis N. ornithoformis

N. optimaA. �e�a A. angusta

Kuwahara et al. 1998 Kuwahara 1999

N. ornithoformis N. optima1997a A. e�celsa

N. ornithoformis N. optima

Fig. 41997a Albaillella

N. ornithoformis N. optimaAlbaillella

AlbaillellaTable 1 Albaillella

Albaillella A. levis A. levis

Ch

ang

hsi

ng

ian

Wu

chia

pin

gia

n

N. optima

N. ornitho-formis

F. charveti -A. yamakitai

AssemblageZone

AbundanceZone

A. triangularis

A. excelsaA. flexa

A. levis

N. o

ptim

a

N. o

rnith

ofor

mis

N. g

raci

lisN

. pse

udog

rypa

N. g

rypa

A. t

rian

gula

ris

A. e

xcel

saA

. ang

usta

A. f

lexa

A. l

auta

A. l

evis

A. p

roto

levi

s

F. p

orre

ctus

F. s

chol

astic

us

253.8 Ma

251.0 Ma

occurrence

abundance

Nodule reported byTakemura and Yamakita (1993)

This nodule

Fig. 4. Composite stratigraphic ranges of important albaillellarian species in the N. ornithoformis and N. optima Assemblage Zones in bedded chert in Mino Belt and assignable ages of the two nodules of this study and Takemura and Yamakita (1993). Stratigraphic ranges of the selected species are based on Ishiga et al. (1982a), Kuwahara (1997a, b, 1999) and Kuwahara et al. (1998).

528

A. �e�aA. angusta A. levis

1997aA. levis Albaillella lauta Kuwahara

1997a A. lauta

A. levisFig. 4 N.

ornithoformis N. optima1997a

Kuwahara et al. 1998

N. optimaA. levis

Neoalbaillella AlbaillellaA. levis

A. �e�a N. optimaAlbaillella

1997aFig. 4

N. ornithoformis N. optima

A. levis

Yao et al. 2001

Neogondolella subcarinata Sweet Neogondolella prechang�ingensis (Mei, Zhang and Wardlaw) Neogondolella chan�ingensis Wang and Wang Clarkina

Changhsingian

Mei et al. 1998

N. optima ChanghsingianN. ornithoformis Wuchiapingian

Changhsingian Wuchapingian/Changhsingian N. ornithoformis

Changhsingian Fig. 4

考察

1983 1986

1996

Yamakita 1988

1993

1992

2001

1993 1994

Kuwahara et al. 1998

Neoalbaillella grypa Ishiga, Kito and Imoto Neoalbaillella pseudogrypa Sashida and TonishiAlbaillella protolevis Kuwahara A. levis N. optima N. ornithoformis

1993

1994 A. levisA. protolevis A. triangularis

2009 Yao et al. 2001

Wuchapingian ChanghsingianFig. 4 N.

529

ornithoformis

Albaillellaria1997a

Albaillella

1997aAlbaillella

1993

NeoalbaillellaA. levis N.

ornithoformis1987 2005

2006 1985 1985

1986 Hada et al. 1992 1993

2001 2001

まとめ

1) Yamakita 1988

Albaillellaria2) Albaillellaria

A. levis

N. ornithoformis

Changhsingian

謝辞

文献

2001107

749-754Hada, S. and Kurimoto, C., 1990, Northern Chichibu Terrane. In

Ichikawa, K., Mizutani, S., Hara, I., Hada, S. and Yao, A. eds., Pre-Cretaceous terranes of Japan, Publication of IGCP Project no. 224, 165-183.

Hada, S., Sato, E., Takeshima, H. and Kawakami, A., 1992, Age of the covering strata in the Kurosegawa Terrane: dismembered continental fragment in southwest Japan. Palaeogeography, Palaeoclimatology, Palaeoecology, 96, 59-69.

198591 155-156

2001no. 12

129-144Ishiga, H., 1986, Late Carboniferous and Permian radiolarian

biostratigraphy of Southwest Japan. Journal of Geosciences, Osaka City University, 29, 89-100.

Ishiga, H., Kito, T. and Imoto, N., 1982a, Late Permian radiolarian assemblages in the Tamba district and an adjacent area, Southwest Japan. Earth Science (Chikyu Kagaku), 36, 10-22.

Ishiga, H., Kito, T. and Imoto, N., 1982b, Permian radiolarian biostratigraphy. News of Osaka Micropaleontologists, Special Volume, no. 5, 17-26.

1985 91 535-5511986

92 497-5161992

98 917-9411990

K-Ar 96 623-6391991

97 431-4502001

530

Explanation of plate 1Scanning electron photomicrographs of Late Permian albaillellarians from a nodule in the boundary part between

Northern Chichibu and Kurosegawa Belts in central Shikoku. Scale bars are 100μm.

no. 12 23-321997a Albaillella

no. 10 55-75Kuwahara, K., 1997b, Paleontological study of Late Permian Albaillella

(Radiolaria). Journal of Geosciences, Osaka City University, 40, 15-36.Kuwahara, K., 1999, Phylogenetic lineage of Late Permian Albaillella

(Albaillellaria, Radiolaria). Journal of Geosciences, Osaka City University, 42, 85-101.

Kuwahara, K. and Sakamoto, M., 1992, Late Permian Albaillella (Radiolaria) from a bedded chert section in the Gujo-hachiman area of the Mino Belt, Central Japan. —Preliminary report on morphometry and cluster analysis—. Journal of Geosciences, Osaka City University, 35, 33-51.

Kuwahara, K., Yao, A. and Yamakita, S., 1998, Reexamination of Upper Permian radiolarian biostratigraphy. Earth Science (Chikyu Kagaku), 52, 391-404.

Maruyama, S., 1981, The Kurosegawa melange zone in the Ino district to the north of Kochi city, central Shikoku. The Journal of the Geological Society of Japan, 87, 569-583.

1998

104 634-653Mei, S., Zhang, K. and Wardlaw, B. R., 1998, A refined succession of

Changhsingian and Griesbachian neogondolellid conodonts from the Meishan section, candidate of global stratotypesection and point of the Permian-Triassic boundary. Palaeogeography, Palaeoclimatology, Palaeoecology, 143, 213-226.

2005

90pp

198539 78-84

1987Neoalbaillella 41 194-197

1996

31 21-421993

115pp2006

112 390-4061982

88 975-9781983

16 143-167; =���� <�?!<����@<�'� ��� ��������Q�� ���& ��� �� ��VX ���� �� [!��

Palaeontographica, Abt. A, 195, 29-74.1994

no. 57 1-5

no. 141993

Neoalbaillellano. 9 41-49

1986 Follicucullus charveti92 909-911

Yamakita, S., 1988, Jurassic - Earliest Cretaceous allochthonous complexes related to gravitational slidings in the Chichibu Terrane of eastern and central Shikoku, Southwest Japan. Journal of the Faculty of Science, The University of Tokyo, Section.II, 21, 467-514.

1998104 623-633

2000

no. 44 5-321992 Palaeofusulina sinensis

Neoalbaillella ornithoformis98 1145-1148

198539 41-56

1997no. 10 155-182

Yao, J., Yao, A. and Kuwahara, K., 2001, Upper Permian biostratigraphic correlation between conodont and radiolarian zones in the Tamba-Mino Terrane, Southwest Japan. Journal of Geosciences, Osaka City University, 44, 97-119.

Yoshikura, S., Hada, S. and Isozaki, Y., 1990, Kurosegawa Terrane. In Ichikawa, K., Mizutani, S., Hara, I., Hada, S. and Yao, A. eds., Pre-Cretaceous terranes of Japan, Publication of IGCP Project no. 224, 185-201.

1–4. Neoalbaillella optima Ishiga, Kito and Imoto

5–7. Neoalbaillella ornithoformis Takemura and Nakaseko

8–12. Albaillella levis Ishiga, Kito and Imoto

13, 14. Albaillella angusta Kuwahara

15. �������������� Kuwahara

16. Follicucullus scholasticus Ormiston and Babcock

1Plate

1 2 3 4

5 6 7 8

9 10 11 12

13 14 15 16