Coupled U-Pb and Lu-Hf zircon data of the marine Pilmatue Member, Agrio Formation: Implications for sedimentary provenance and source areas across the Early Cretaceous in the Neuquen Basin, Argentina

被引：0

作者：

Lugo, Francisco I. ^{[1
]}

Comerio, Marcos A. ^{[2
,3
]}

Justiniano, Carlos A. Ballivian ^{[2
,4
]}

Arnol, Jonatan A. ^{[2
,5
]}

Rolan, Julian D. ^{[2
,5
,6
]}

Pazos, Pablo J. ^{[2
,7
]}

Basei, Miguel A. S. ^{[8
]}

机构：

[1] Univ Nacl Plata, Fac Ciencias Nat & Museo, Av 60 Esq 122 S-N, RA-1900 Buenos Aires, Argentina

[2] Consejo Nacl Invest Cient & Tecn CONICET, Buenos Aires, Argentina

[3] Y TEC YPF Tecnol, Av Petr S-N, RA-1923 Buenos Aires, Argentina

[4] Univ Buenos Aires, Inst Geociencias Bas Aplicadas & Ambientales Bueno, CONICET, Ciudad Univ Pabellon 2 Piso 1, RA-1428 Buenos Aires, Argentina

[5] Univ Nacl Plata, Fac Ciencias Nat & Museo, Div Geol, Museo Plata, Paseo Bosque S-N, RA-B1900FWA Buenos Aires, Argentina

[6] Univ Buenos Aires, CONICET, Inst Geocronol & Geol Isotop INGEIS, Ciudad Univ Pabellon INGEIS, RA-1428 Buenos Aires, Argentina

[7] Univ Buenos Aires, CONICET, Inst Estudios Andinos Don Pablo Groeber IDEAN, Ciudad Univ Pabellon II, Ciudad Univ Pabellon 2,Piso 1, RA-1428 Buenos Aires, Argentina

[8] Univ Sao Paulo, Ctr Pesquisas Geocronol & Geoquim Isotop CPGeo, Inst Geociencias, Rua Lago 562,Cidade Univ, BR-05508080 Sao Paulo, Brazil

来源：

CRETACEOUS RESEARCH | 2025年 / 169卷

关键词：

Lower Cretaceous; Western Gondwana; Detrital zircons; Clay minerals; Provenance; Paleoclimate; FAMATINIAN MAGMATIC ARC; PROTO-ANDEAN MARGIN; DETRITAL ZIRCON; SOUTHWESTERN GONDWANA; CRUSTAL GROWTH; CLAY-MINERALS; PALEOCLIMATIC INTERPRETATION; SEQUENCE STRATIGRAPHY; ISOTOPIC COMPOSITION; WESTERN ARGENTINA;

D O I：

10.1016/j.cretres.2025.106083

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

The Lower Cretaceous Neuquen Basin is characterized by an almost complete stratigraphic record with marine and continental successions that have been addressed from the perspective of compositional and provenance analyses. However, determination of source areas through geological time is still a matter of debate. This work focuses in the upper Valanginian-lower Hauterivian Pilmatue Member (Agrio Formation of the Mendoza Group), a marine unit that represents shallow to offshore settings mainly composed of mudstones. In order to study the provenance and source areas, outcrop samples were examined through petrography, X-ray diffraction, and U-Pb/Lu-Hf zircon analyses. Sandstone deposits are scarce in the unit and show high compositional maturity related to fine-grained sediments preserved during transport until their final deposition. In the Pilmatue Member, the clay fraction is dominated by detrital illite and chlorite derived from the erosion of plutonic/metasedimentary basement rocks likely subjected to arid-semi-arid climate in the hinterland. Four main U-Pb age populations were determined: (1) Mesoproterozoic-Neoproterozoic, (2) Cambrian-Ordovician, (3) Permian-Triassic, and (4) Early-Middle Jurassic, which indicate an important denudation of old igneous-metamorphic basement rocks not recorded in the underlying Upper Jurassic and Lower Cretaceous units. A detailed compilation of the limited U-Pb/Lu-Hf zircon data from Upper Jurassic and Lower Cretaceous units reinforce the ideas that hinterland source regions located adjacent to the basin boundaries were the main source of clastic detritus. Since U-Pb ages show little variations across late Valanginian-Albian times, sediment transfer zones seem to have been stable during the closure of the back-arc basin stage. Published by Elsevier Ltd.

引用

页数：22

共 136 条

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