期刊
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
卷 126, 期 4, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020JB019682
关键词
High reliable paleointensities; IZZI protocol; Lesser Caucasus; multispecimen protocols; Thellier-Thellier protocol
资金
- Agencia Estatal de Investigacion, Spain [PID2019-105796/10.13039/501100011033]
- Junta de Castilla y Leon, Spain [BU066U16]
- MINECO, Spain [BES-2013-064060]
- Fulbright Commission
- Spanish Ministry of Science, Innovation and Universities
- DGAPA-PAPIIT [IN101717]
- French National Agency for Research [ANR-12-BS06-0015]
- Agence Nationale de la Recherche (ANR) [ANR-12-BS06-0015] Funding Source: Agence Nationale de la Recherche (ANR)
Using a multimethod approach, including MSP and Thellier-type methods, reliable paleointensity data were obtained through strict selection criteria, demonstrating consistency in intensity values from different methods.
We report paleointensity results obtained with the multispecimen method (MSP) over the Pliocene sequence of Apnia (Georgia) which records a polarity reversal. Paleointensity determinations with the multispecimen technique were performed on 12 flows with the original (MSP-DB) and the domain-state corrected (MSP-DSC) protocol. Eight MSP-DSC determinations passed the proposed quality criteria. To obtain highly reliable data through the agreement between intensity values from different methods, MSP results were combined with paleointensities from a previous study with Thellier-type methods and especially strict selection criteria (RCRIT) on same flows (Sanchez-Moreno et al., 2020). Application of this multimethod procedure resulted in three new paleointensities including both MSP and Thellier-type results and an additional one obtained with two different Thellier-type methods, yielding one paleointensity of 36.9 mu T in the normal-polarity, and three paleointensities between 19.2 and 24.1 mu T in the reverse-polarity section. Additionally, Thellier-type data have been reinterpreted in this study with more flexible criteria (TTP) and the results combined with the MSP data. As a result, four flows yield paleointensities including MSP and Thellier-type determinations and seven include paleointensities obtained with two different Thellier-type methods. Results range from 37.2 and 44.3 mu T in the normal-polarity and from 12.5 to 24.6 mu T in the reverse-polarity section. Comparison of results from the four flows yielding multimethod determinations applying RCRIT criteria with those from the same flows under TTP criteria yields no significant difference in paleointensity values and their experimental uncertainty. Thus, application of a multimethod approach supports the possibility of using TTP criteria.
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