干旱区生态环境知识资源中心(Arid): Mineralogy and geochemistry of deeply-buried marine sediments of the Vaca Muerta-Quintuco system in the Neuquen Basin (Chacay Melehue section), Argentina: Paleoclimatic and paleoenvironmental implications for the global Tithonian-Valanginian reconstructions

Arid

DOI	10.1016/j.jsames.2020.103103
	Mineralogy and geochemistry of deeply-buried marine sediments of the Vaca Muerta-Quintuco system in the Neuquen Basin (Chacay Melehue section), Argentina: Paleoclimatic and paleoenvironmental implications for the global Tithonian-Valanginian reconstructions
	Capelli, Ignacio A.; Scasso, Roberto A.; Spangenberg, Jorge E.; Kietzmann, Diego A.; Cravero, Fernanda; Duperron, Maria; Adatte, Thierry
通讯作者	Capelli, IA (corresponding author), Univ Buenos Aires, CONICET, Inst Geociencias Basicas Aplicadas & Ambientales, Intendente Guiraldes 2160, RA-1428 Buenos Aires, DF, Argentina.
来源期刊	JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
ISSN	0895-9811
EISSN	1873-0647
出版年	2021
卷号	107
英文摘要	The Vaca Muerta-Quintuco (VM-Q) system of Tithonian-early Valanginian age was studied in the Chacay Melehue section of the Neuqu en Basin (western Argentina) by means of sedimentological, mineralogical and geochemical analyses in order to determine the main driving factors that triggered the paleoenvironmental change from a carbonate ramp (Vaca Muerta Formation, VMFm) to a mixed siliciclastic/carbonatic marine environment (Quintuco Formation, QFm). The VMFm was divided into two stratigraphic intervals: Lower VMFm (LVMFm) and Upper VMFm (UVMFm), whereas the QFm is subdivided into the Puesto Barros Member (PBMb) and the Cerro La Visera Member (CVMb), which can be correlated to other sections in the basin (e.g., Puerta Curaco). Isolated, turbiditic sandstone beds, correlated to the Huncal Member, are included in the QFm. The LVMFm (Tithonian) and the UVMFm (Berriasian) are constituted by dark, well-laminated marls, mudstones, calcite concretions and tuffs. The PBMb (earlier early Valanginian) is constituted by marls and sand-stones, whereas the CVMb (later early Valanginian) is constituted by marls, mudstones, siltstones, sandstones and coquinas. The LVMFm (Total organic carbon, TOC similar to 1-4 wt%) is characterized by the enrichment of redox sensitive trace elements (RSTE), where the enrichment of Ni and Cu suggest high productivity in the water column, and the enrichment of Mo, U, V points to sea bottom anoxia, with periods of increased oxygenation as deduced from higher P concentrations in marls and mudstones. The clay mineral association is constituted by mixed-layer illite/smectite formed by the transformation of smectitic layers. The predominance of smectite in coeval sucessions, less overprinted by burial diagenesis, suggests a temperate and semi-arid climate in the adjacent continent. The UVMFm (TOC similar to >1 wt%) is characterized by a gradual decrease of the RSTE pointing to a decrease in productivity and a slight increase in the oxygenation of the sea bottom. In addition, a change towards more humid conditions in the continent is inferred by both the increase in the Chemical Index of Alteration and the Al2O3/TiO2 ratio. The PBMb (TOC similar to 1 wt%) has even lower content of RSTE indicating diminished sea water productivity and a gradual rise of the oxygenation of the sea bottom. In this interval, increased illite contents suggest periods of enhanced physical weathering, probably related to the tectonic uplift of the Huincul Ridge. The RSTE in the CVMb (TOC <1 wt%) documents a fully oxygenated sea bottom, where the productivity of the water column was negligible. The presence of kaolinite and the increment of the detrital sedimentation in the CVMb indicate a change towards more humid conditions in the hinterlands. The enhanced runoff caused by this paleoclimatic change towards more humid conditions that started in the early Berriasian and increased during the later early Valanginian triggered the change from carbonate ramp to mixed siliciclastic/carbonatic to siliciclastic marine paleoenvironments. The organic carbon isotope composition (delta C-13(org) vs. VPDB) of the VMFm ranges between 30.0 and 23.4%, whereas in the QFm values range between 29.0 and -23.9%. Two positive carbon isotope excursions (PCIE) are recorded in the system: PCIE-A in the lower part of the VMFm (early Tithonian) with delta C-13(org) values similar to -25%, and PCIE-B in the upper part of the QFm (later early Valanginian) with delta C-13(org) values similar to -24.5%. The shift in delta C-13(org) at PCIE-B is up to +4.2% and marks the onset of the Weissert Event. This is the first time that the onset of this event is recorded in the Neuqu ' en Basin, within the Lissonia riveroi ammonite zone. The results of our study confirm that clay mineralogy, trace elements and stable isotopes are valuable proxies of past ocean-climate variability even in sediment deposits that underwent near-surface and deep burial diagenesis.
英文关键词	Organic carbon isotope composition Clay minerals Diagenesis Paleoredox Paleoproductivity Vaca Muerta Formation
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000637668100001
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368901
作者单位	[Capelli, Ignacio A.; Scasso, Roberto A.; Kietzmann, Diego A.; Duperron, Maria] Univ Buenos Aires, CONICET, Inst Geociencias Basicas Aplicadas & Ambientales, Intendente Guiraldes 2160, RA-1428 Buenos Aires, DF, Argentina; [Scasso, Roberto A.; Kietzmann, Diego A.] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Ciencias Geol, Intendente Guiraldes 2160, RA-1428 Buenos Aires, DF, Argentina; [Spangenberg, Jorge E.] Univ Lausanne, Inst Dynam Surface Terr IDYST, Quartier UNIL Mouline, Batiment Geopolis, CH-1015 Lausanne, Switzerland; [Cravero, Fernanda] Consejo Nacl Invest Cient & Tecn, CIC, Ctr Tecnol Recursos Minerales & Ceram CETMIC, Camino Centenario & 506, RA-1897 Buenos Aires, DF, Argentina; [Adatte, Thierry] Univ Lausanne, Inst Sci Terre ISTE, Quartier UNIL Mouline, Batiment Geopolis, CH-1015 Lausanne, Switzerland
推荐引用方式 GB/T 7714	Capelli, Ignacio A.,Scasso, Roberto A.,Spangenberg, Jorge E.,et al. Mineralogy and geochemistry of deeply-buried marine sediments of the Vaca Muerta-Quintuco system in the Neuquen Basin (Chacay Melehue section), Argentina: Paleoclimatic and paleoenvironmental implications for the global Tithonian-Valanginian reconstructions[J],2021,107.
APA	Capelli, Ignacio A..,Scasso, Roberto A..,Spangenberg, Jorge E..,Kietzmann, Diego A..,Cravero, Fernanda.,...&Adatte, Thierry.(2021).Mineralogy and geochemistry of deeply-buried marine sediments of the Vaca Muerta-Quintuco system in the Neuquen Basin (Chacay Melehue section), Argentina: Paleoclimatic and paleoenvironmental implications for the global Tithonian-Valanginian reconstructions.JOURNAL OF SOUTH AMERICAN EARTH SCIENCES,107.
MLA	Capelli, Ignacio A.,et al."Mineralogy and geochemistry of deeply-buried marine sediments of the Vaca Muerta-Quintuco system in the Neuquen Basin (Chacay Melehue section), Argentina: Paleoclimatic and paleoenvironmental implications for the global Tithonian-Valanginian reconstructions".JOURNAL OF SOUTH AMERICAN EARTH SCIENCES 107(2021).