Filling the Gap: New Precise Early Cretaceous Radioisotopic Ages from the Andes

Beatriz Aguirre-Urreta; Marina Lescano; Mark D. Schmitz; Maisa Tunik; Andrea Concheyro; Peter F. Rawson; Victor A. Ramos

doi:10.1017/S001675681400082X

Filling the Gap: New Precise Early Cretaceous Radioisotopic Ages from the Andes

Beatriz Aguirre-Urreta, Marina Lescano, Mark D. Schmitz, Maisa Tunik, Andrea Concheyro, Peter F. Rawson, Victor A. Ramos

Geosciences Department

Research output: Contribution to journal › Article › peer-review

64 Scopus citations

Abstract

Two tuffs in the Lower Cretaceous Agrio Formation, Neuquén Basin, provided U–Pb zircon radioisotopic ages of 129.09 ± 0.16 Ma and 127.42 ± 0.15 Ma. Both horizons are well constrained biostratigraphically by ammonites and nannofossils and can be correlated with the ‘standard’ sequence of the Mediterranean Province. The lower horizon is very close to the base of the Upper Hauterivian and the upper horizon to the Hauterivian/Barremian boundary, indicating that the former lies at c . 129.5 Ma and the latter at c . 127 Ma. These new radioisotopic ages fill a gap of over 8 million years in the numerical calibration of the current global Early Cretaceous geological time scale.

Original language	American English
Pages (from-to)	557-564
Number of pages	8
Journal	Geological Magazine
Volume	152
Issue number	3
DOIs	https://doi.org/10.1017/S001675681400082X
State	Published - May 2015

Keywords

Hauterivian
Neuquén Basin
U–Pb CA-ID-TIMS
ammonoids
biostratigraphy
calcareous nannofossils

EGS Disciplines

Earth Sciences
Geophysics and Seismology

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10.1017/S001675681400082X

Filling the Gap New Precise Early Cretaceous Radioisotopic AgesFinal published version, 650 KBLicense: Other

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@article{796c072075274bc7803fb3c2853af232,

title = "Filling the Gap: New Precise Early Cretaceous Radioisotopic Ages from the Andes",

abstract = " Two tuffs in the Lower Cretaceous Agrio Formation, Neuqu{\'e}n Basin, provided U–Pb zircon radioisotopic ages of 129.09 ± 0.16 Ma and 127.42 ± 0.15 Ma. Both horizons are well constrained biostratigraphically by ammonites and nannofossils and can be correlated with the {\textquoteleft}standard{\textquoteright} sequence of the Mediterranean Province. The lower horizon is very close to the base of the Upper Hauterivian and the upper horizon to the Hauterivian/Barremian boundary, indicating that the former lies at c . 129.5 Ma and the latter at c . 127 Ma. These new radioisotopic ages fill a gap of over 8 million years in the numerical calibration of the current global Early Cretaceous geological time scale.",

keywords = "Hauterivian, Neuqu{\'e}n Basin, U–Pb CA-ID-TIMS, ammonoids, biostratigraphy, calcareous nannofossils",

author = "Beatriz Aguirre-Urreta and Marina Lescano and Schmitz, {Mark D.} and Maisa Tunik and Andrea Concheyro and Rawson, {Peter F.} and Ramos, {Victor A.}",

note = "Publisher Copyright: Copyright {\textcopyright} Cambridge University Press 2015.",

year = "2015",

month = may,

doi = "10.1017/S001675681400082X",

language = "American English",

volume = "152",

pages = "557--564",

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TY - JOUR

T1 - Filling the Gap

T2 - New Precise Early Cretaceous Radioisotopic Ages from the Andes

AU - Aguirre-Urreta, Beatriz

AU - Lescano, Marina

AU - Schmitz, Mark D.

AU - Tunik, Maisa

AU - Concheyro, Andrea

AU - Rawson, Peter F.

AU - Ramos, Victor A.

PY - 2015/5

Y1 - 2015/5

N2 - Two tuffs in the Lower Cretaceous Agrio Formation, Neuquén Basin, provided U–Pb zircon radioisotopic ages of 129.09 ± 0.16 Ma and 127.42 ± 0.15 Ma. Both horizons are well constrained biostratigraphically by ammonites and nannofossils and can be correlated with the ‘standard’ sequence of the Mediterranean Province. The lower horizon is very close to the base of the Upper Hauterivian and the upper horizon to the Hauterivian/Barremian boundary, indicating that the former lies at c . 129.5 Ma and the latter at c . 127 Ma. These new radioisotopic ages fill a gap of over 8 million years in the numerical calibration of the current global Early Cretaceous geological time scale.

AB - Two tuffs in the Lower Cretaceous Agrio Formation, Neuquén Basin, provided U–Pb zircon radioisotopic ages of 129.09 ± 0.16 Ma and 127.42 ± 0.15 Ma. Both horizons are well constrained biostratigraphically by ammonites and nannofossils and can be correlated with the ‘standard’ sequence of the Mediterranean Province. The lower horizon is very close to the base of the Upper Hauterivian and the upper horizon to the Hauterivian/Barremian boundary, indicating that the former lies at c . 129.5 Ma and the latter at c . 127 Ma. These new radioisotopic ages fill a gap of over 8 million years in the numerical calibration of the current global Early Cretaceous geological time scale.

KW - Hauterivian

KW - Neuquén Basin

KW - U–Pb CA-ID-TIMS

KW - ammonoids

KW - biostratigraphy

KW - calcareous nannofossils

UR - http://www.scopus.com/inward/record.url?scp=84927696866&partnerID=8YFLogxK

UR - https://scholarworks.boisestate.edu/geo_facpubs/252

U2 - 10.1017/S001675681400082X

DO - 10.1017/S001675681400082X

M3 - Article

SN - 0016-7568

VL - 152

SP - 557

EP - 564

JO - Geological Magazine

JF - Geological Magazine

IS - 3

ER -

Filling the Gap: New Precise Early Cretaceous Radioisotopic Ages from the Andes

Abstract

Keywords

EGS Disciplines

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