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タイトル: Tectonic significance of Late Cretaceous Radiolaria from the obducted Matakaoa Volcanics, East Cape, North Island, New Zealand(MEMORIAL VOLUME TO THE LATE PROFESSOR TERUHIKO SAMESHIMA)
著者: Spörli, K. Bernhard
Aita, Yoshiaki
掲載誌名: Geoscience reports of Shizuoka University
出版者: Shizuoka University. Institute of Geosciences
巻: 20
開始ページ: 115
終了ページ: 133
出版日付: 1994-03
NDC: 455
抄録: Radiolarian faunas from several localities in the Matakaoa Volcanics of the Mangaroa Range, North Island, New Zealand indicate Late Cretaceous (Campanian to Maastrichtian) ages. This contrasts with Late Paleocene/Early Eocene ages obtained from foraminifera approximately 3 km higher in the section. The radiolarian faunas are cosmopolitan and may have been deposited at mid to high latitude. A new structural analysis indicates that the fossils occur in a sequence of intercalated pillow lavas, sediments and dolerites about 10 km thick equivalent of layer 2B of the oceanic crust. This great thickness implies that there has been much repetition by shortening deformation. Layering dips steeply; younging is generally to the north and the sequence is affected by km-scale steeply plunging folds associated with decollements. Structural development involved first formation of melange, and subsequent refolding of these structures to give the present dextral, steeply plunging folds. It is not clear yet how another phase of deformation, steepening and overturning of layering in the Matakaoa Volcanics, relates to these two tectonic events.
ISSN: 03886298 OPAC
NII論文ID: 110000413351 ciniia
NII書誌ID: AN00103190 OPAC ciniib
バージョン: publisher
出現コレクション:1993 20

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