Spathian to Aegean (upper Lower Triassic to lower Middle Triassic) carbon isotope stratigraphy constrained by the conodont biostratigraphy of carbonates on top of a mid‐oceanic seamount formed in the Panthalassic Ocean
نویسندگان
چکیده
Abstract The Taho Formation in western Shikoku Island, Japan, consists of Triassic carbonates that formed on a seamount the Panthalassic Ocean. In order to investigate stratigraphy and paleoceanography this carbonate succession, we analyzed biostratigraphy chemostratigraphy 17.6 m‐thick section upper at stratotype area Tahokamigumi, Seiyo City. This comprises bioclastic limestone containing bivalves, ammonoids, conodonts. We recognized six conodont zones (in ascending order): Novispathodus pingdingshanensis , brevissimus Triassospathodus symmetricus homeri Chiosella timorensis Magnigondolella cf. alexanderi zones. Thus, studied succession is latest Smithian Aegean age. A δ 13 C profile shows elevated values during lowest Spathian followed by gradual negative excursion, subsequent positive excursion near Spathian–Aegean boundary, relatively constant Aegean. characteristic series excursions correlates with other records for period, including peak Smithian–lowest (P3), lower middle (N4), Spathian–lowest (P4). represents new high‐resolution record Ocean, which ages are constrained biostratigraphy. exhibits consistent offset ~2 ‰ as compared those from regions (i.e., mostly Tethyan Ocean). can be explained preferential removal 12 seawater photosynthesis calcification marine organisms over platform, and/or high dissolved inorganic carbon Ocean due less influence C‐enriched terrestrial waters organic production/burial more restricted
منابع مشابه
from linguistics to literature: a linguistic approach to the study of linguistic deviations in the turkish divan of shahriar
chapter i provides an overview of structural linguistics and touches upon the saussurean dichotomies with the final goal of exploring their relevance to the stylistic studies of literature. to provide evidence for the singificance of the study, chapter ii deals with the controversial issue of linguistics and literature, and presents opposing views which, at the same time, have been central to t...
15 صفحه اولa synchronic and diachronic approach to the change route of address terms in the two recent centuries of persian language
terms of address as an important linguistics items provide valuable information about the interlocutors, their relationship and their circumstances. this study was done to investigate the change route of persian address terms in the two recent centuries including three historical periods of qajar, pahlavi and after the islamic revolution. data were extracted from a corpus consisting 24 novels w...
15 صفحه اولdepositional environments and sequence stratigraphy of the sorkh shale formation (lower triassic) in the tabas block
the sorkh shale formation (lower triassic) crops out in parts of tabas block. this formation is composed of limestone, dolomite, sandstone, shale and gypsum. its lower contact with the permian rocks and its upper contact with the shotori formation is marked by distinct erosional unconformity. to determine the depositional environments of the sorkh shale formation, stratigraphic sections of goda...
متن کاملa study on the effectiveness of textual modification on the improvement of iranian upper-intermediate efl learners’ reading comprehension
این پژوهش به منظور بررسی تأثیر اصلاح متنی بر بهبود توانایی درک مطلب زبان آموزان ایرانی بالاتر از سطح میانی انجام پذیرفت .بدین منظور 115 دانشجوی مرد و زن رشته مترجمی زبان انگلیسی در این پزوهش شرکت نمودند.
ذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Island Arc
سال: 2021
ISSN: ['1038-4871', '1440-1738']
DOI: https://doi.org/10.1111/iar.12391