Marine osmium isotope record during the Carnian “pluvial episode” (Late Triassic) in the pelagic Panthalassa Ocean
نویسندگان
چکیده
The Carnian Pluvial Episode (CPE) was a global environmental change and biotic crisis that occurred during the (Late Triassic). climate CPE characterized by short-lived period of extreme rainfall, an extinction marine taxa is known to have latest Julian (i.e. early Carnian). Although these events are considered been caused Wrangellia Flood Basalt (FB) volcanism, existing studies found little direct evidence support this. We investigated temporal relationship between eruption FB using high-resolution microfossil biostratigraphy paleo-seawater Os isotope data Upper Triassic bedded chert succession from accretionary complex in Japan, which accumulated pelagic deep-sea environment equatorial region Panthalassa Ocean. Our biostratigraphic analysis, based on conodonts radiolarians, osmium show: (i) continuous decline initial ratios (187Os/188Osi) Julian; (ii) low 187Os/188Osi late (iii) abrupt increase at end Julian. decrease throughout suggests increased input unradiogenic into ocean. Moreover, redox-sensitive elements, such as V U, abruptly Julian, first reducing conditions within Marine anoxic event has recognized widespread deposition black shales organic-rich marls intermediate shallow water Tethyan sections. Thus, oxygen-depleted continental margin, well Ocean, volcanism.
منابع مشابه
A Late Triassic major negative !13C spike linked to Wrangellia LIP: The Carnian Pluvial Event revealed
A Late Triassic major negative !13C spike linked to Wrangellia LIP: The Carnian Pluvial Event revealed J. DAL CORSO1*, P. MIETTO1, R.J. NEWTON2, R.D. PANCOST3, N. PRETO1, G. ROGHI4 AND P.B. WIGNALL2 1Dipartimento di Geoscienze, Università degli Studi di Padova, via Gradenigo 6, 35131, Padova, Italy (*correspondence: [email protected]). 2School of Earth and Environments, University of Lee...
متن کاملOsmium isotope evidence for a large Late Triassic impact event
Anomalously high platinum group element concentrations have previously been reported for Upper Triassic deep-sea sediments, which are interpreted to be derived from an extraterrestrial impact event. Here we report the osmium (Os) isotope fingerprint of an extraterrestrial impact from Upper Triassic chert successions in Japan. Os isotope data exhibit a marked negative excursion from an initial O...
متن کاملDetermining chondritic impactor size from the marine osmium isotope record.
Decreases in the seawater 187Os/188Os ratio caused by the impact of a chondritic meteorite are indicative of projectile size, if the soluble fraction of osmium carried by the impacting body is known. Resulting diameter estimates of the Late Eocene and Cretaceous/Paleogene projectiles are within 50% of independent estimates derived from iridium data, assuming total vaporization and dissolution o...
متن کاملthe effect of the record infancy in crimilly acts of guilties (in karaj city)
چکیده یکی از مهمترین دغدغه های بزرگ جوامع بشری، از دیر باز تا کنون که ذهن پژوهشگران و متخصصان بهداشت روانی و اجتماعی و دولتها رابه خود مشغول داشته، مسأله ی بزهکاری می باشد. شناخت کامل پدیده ی بزهکاری و بزهکار، علل وعوامل سقوط یک انسان، چگونگی درمان وی و درنهایت پیشگیری ازبزهکاری ودریک کلام سالم سازی یک جامعه، رسالت عظیم، انسانی ومقدسی می باشد که با بررسی شخصیت مجرم یعنی[ انسانی که تحت شرای...
15 صفحه اولذخیره 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: Global and Planetary Change
سال: 2021
ISSN: ['0921-8181', '1872-6364']
DOI: https://doi.org/10.1016/j.gloplacha.2020.103387