Magnetostratigraphy of a Lower-Middle Triassic Boundary Section from Chios (Greece)

Publication Status is "Submitted" Or "In Press: 
LDEO Publication: 
Publication Type: 
Year of Publication: 
1995
Editor: 
Journal Title: 
Physics of the Earth and Planetary Interiors
Journal Date: 
Dec
Place Published: 
Tertiary Title: 
Volume: 
92
Issue: 
3-4
Pages: 
245-260
Section / Start page: 
Publisher: 
ISBN Number: 
0031-9201
ISSN Number: 
Edition: 
Short Title: 
Accession Number: 
ISI:A1995TG81800008
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Call Number: 
Abstract: 

The Marmarotrapeza Formation at Chios Island (northern Aegean Sea, Greece) is renowned for its Lower-Middle Triassic boundary sections in a marine Tethyan setting. Two sections have been sampled bed by bed to develop a magnetostratigraphic framework for the ammonoid and conodont biostratigraphy. The boundary sections occur within a lower normal (A(+))-reverse (B-)-upper normal (C+) polarity sequence. The Lower-Middle Triassic boundary, placed at the first occurrence of the ammonoid genera Aegeiceras ugra Diener, Parncrochordiceras spp., Paradanubites depressus Fantini Sestini and Japonites sp., and close to the first appearance of the conodont species Gondolella timorensis Nogami, occurs in normal polarity zone Chios C+. The overall mean direction of the reversal-bearing characteristic component, whose early acquisition is suggested by a tilt test, is D = 271.2 degrees, 1 = 33.2 degrees (alpha(95) = 11.7 degrees, k = 112.5, N = 3). The inferred paleolatitude of the sampling sites is about 18 degrees N, consistent with either an African or stable European affinity, although the declinations suggest large-scale counter-clockwise rotations with respect to Africa or stable Europe since the Early-Middle Triassic.

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Tg818Times Cited:12Cited References Count:40

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