Index Geophysics

eng Correlated variations and periodicity of global CO2, biological mass extinctions and extra-terrestrial bolide impacts over the past 250 million years and possible geodynamical implications

hrv Korelacije između periodičnosti promjena globalnog CO2, masovnih izumiranja vrsta i udara izvanzemaljskih bolida tijekom proteklih 250 milijuna godina s mogućim geodinamičkim posljedicama

eng Earth’s history has been witness to recurrently alternating phases of catastrophic evolution and dominant tectonic deformations, contractions and extension of rifting and spreading leading to quasi-cyclic changes in sedimentary environment and various earth processes. Recent studies have shown quasi-periodicities of 32 ± 2 Million years (Myr) in various endogenic (geomagnetic reversals, magmatic events, mantle convection, various tectonic activities, climate change and biological extinctions) and exogenic (impact cratering) processes indicating a remarkable kinship. We present here time series analysis of the available CO2 record over the past 250 Myr decoded from CaCO3 accumulation rates in sedimentary environment. The time series analysis reveals an intriguing evidence of a dominant periodicity of 33 ± 2 Myr which matches closely with a common “catastrophic periodicity” of 32 Myr identified in various terrestrial and extra-terrestrial records. We argue here for a common physical link among the periodic global CO2 variations, mantle convection, geomagnetic reversals, volcanism, geotectonic cycles and enhanced cometary showers. We also suggest periodic variations in CO2 as one of the possible terrestrial stimulators for the oscillating “greenhouse effect” and related climatic deterioration that result in quasi-periodic mass extinctions. Identical “catastrophic cycles” of endogenic and exogenic origin enhance the credence of their physical linkages and uphold the “concept of non-uniformitarianism” in earth’s processes.

hrv U Zemljinoj povijesti izmjenjivale su se faze evolucije kao posljedica prirodnih katastrofa s dominantno tektonskim deformacijama, kontrakcijama i širenjima, što je dovelo do pojave kvazi-periodičkih promjena u sedimentima, kao i kod mnogih sa Zemljom povezanih procesa. Nedavne studije ukazale su na kvaziperiodičnost od 32±2
milijuna godina pri raznim endogenim (geomagnetske izmjene polova, vulkanizam, konvekcija u plaštu, tektonska aktivnost, klimatske promjene i izumiranja vrsta) i egzogenim (udarni krateri) procesima, sa zamjetnim sličnostima. Prikazat ćemo analizu
vremenskih nizova dostupnih podataka o količini CO2 tijekom proteklih 250 milijuna godina, o čemu je zaključeno na temelju globalne akumulacije CaCO3 u sedimentima.
Analiza otkriva intrigantnu periodičnost od 33±2 milijuna godina, što je vrlo slično »periodičnosti katastrofa« od 32±2 milijuna godina koja je evidentirana u raznim nizovima zemaljskog i izvanzemaljskog podrijetla. Predlažemo zajedničku fizikalnu
vezu između globalne varijacije količine CO2, konvekcije u plaštu, promjena geomagnetskih polova, vulkanizma, geotektonskih ciklusa i pojačanih meteorskih rojeva. Također predlažemo mogućnost da je periodička varijacija količine CO2 jedan od mogućih Zemaljskih stimulatora promjenljivosti »efekta staklenika« i s time povezanog
pogoršanja klime koje dovodi do masovnog izumiranja vrsta. Identični »ciklusi katastrofa« endogenog i egzogenog podrijetla dokaz su više u prilog njihovoj fizikalnoj povezanosti i u skladu s konceptom neuniformnosti pri procesima na Zemlji.

Tiwari, R. K.

Rao, K. N. N.

eng Periodicity; global CO2; geodynamics

hrv periodičnost; globalni CO2; geodinamika

Andrija Mohorovicic Geophysical Institute

1998

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https://hrcak.srce.hr/17773

eng https://hrcak.srce.hr/file/27541

Geofizika

ISSN 0352-3659 (Print)

ISSN 1846-6346 (Online)

Volume 15

Issue 1

eng

info:eu-repo/semantics/openAccess

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