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Armstrong-Altrin, John S.
- Geochemistry of Sandstones from the Upper Cretaceous Sillakkudi Formation, Cauvery Basin, Southern India: Implication for Provenance
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Authors
Affiliations
1 Department of Geology, Anna University, Chennai - 600 025, IN
2 Department of Applied Geology, School of Engineering and Science, Curtin University, CDT 250, 98009, Miri, Sarawak, MY
3 Unidad Academica de Geologia Marina y Ambiental, Instituto de Ciencias del Mar y Limnologia, Universidad Nacional Autonoma de Mexico, Mexico D.F., C.P. 04510, MX
1 Department of Geology, Anna University, Chennai - 600 025, IN
2 Department of Applied Geology, School of Engineering and Science, Curtin University, CDT 250, 98009, Miri, Sarawak, MY
3 Unidad Academica de Geologia Marina y Ambiental, Instituto de Ciencias del Mar y Limnologia, Universidad Nacional Autonoma de Mexico, Mexico D.F., C.P. 04510, MX
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 76, No 5 (2010), Pagination: 453-467Abstract
Major, trace and rare earth elements (REE) composition of sandstones from the Upper Cretaceous Sillakkudi Formation, Ariyalur Group, Cauvery Basin were studied to decipher their weathering and provenance history. Texturally, these sandstones are immature, poorly sorted and grain supported. Abundance of feldspars especially, plagioclase indicates rapid deposition of sediments from a nearby source rocks. Using the geochemical classification diagram the Sillakkudi sandstones are classified as fe-sand, quartz arenite, litharenite, sub-litharenite, sub-arkose, arkose, and wacke types, which is also supported by the petrography study. The transition trace elements like Co, Ni, and V are higher in the Sillakkudi sandstones than upper continental crust (UCC) values. However, the Sillakkudi sandstones are lower in Cr (mean ∼21) content than average UCC value (∼35). The poor correlation between Cr and Ni (r = 0.08, number of samples n = 20) imply that these sandstones were derived from felsic source rocks. Similarly, the Eu/Eu* (0.35-1.73), La/Sc (1.93-9.36), Th/Sc (0.41-6.57), Th/Co (0.14-5.01), Th/Cr (0.23-2.94), and Cr/Th (0.34-4.28) ratios support a felsic source for the Sillakkudi sandstones. The significant enrichment of Zr, Hf, and Th in fe-sand, sub-arkose and litharenite could be related to the presence of heavy minerals, especially zircon. However, the zircon geochemistry did not affect the REE distribution and its patterns in the Sillakkudi sandstones. The Chondrite normalized REE patterns of Sillakkudi sandstones are characterized by relatively flat HREE (Gd/YbCN = ∼0.73-2.41; subscript CN refers to chondrite normalized value), enriched LREE (La/SmCN = ∼3.39-5.82) and negative Eu anomaly (mean value Eu/Eu* = 0.80). The Gd/YbCN ratios (∼0.73-2.50) are less than 2.5, which suggest that these Sillakkudi sandstones were derived from the less HREE depleted source rocks. The comparison of REE patterns and its Eu anomalies to the source rocks reveals that the Sillakkudi sandstones received a major contribution of sediments from Dharwar craton.Keywords
Geochemistry, Zircon, Sandstones, Upper Cretaceous, Sillakkudi, Cauvery Basin.- Petrography and Stable Isotope Geochemistry of the Cretaceous El Abra Limestones (Actopan), Mexico: Implication on Diagenesis
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Authors
John S. Armstrong-Altrin
1,
J. Madhavaraju
2,
Alcides N. Sial
3,
Juan J. Kasper-Zubillaga
1,
R. Nagarajan
4,
K. Flores-Castro
5,
Janet Luna Rodriguez
5
Affiliations
1 Instituto de Ciencias del Mar y Limnologia, Unidad de Geologia Marina y Ambiental, Universidad Nacional Autonoma de Mexico, Circuito Exterior s/n, 04510, Mexico D.F., MX
2 Estacion Regional del Noroeste, Instituto de Geologia, Universidad Nacional Autonoma de Mexico, Hermosillo 83000, Sonora, MX
3 Nucleo de Estudos Geoquimicos e Laboratorio de Isotopos Estaveis (NEG - LABISE), Departmento de Geologia, Universidade Federal de Pernambuco, Caixa Posta 7852, 50670-000 Recife, BR
4 Department of Applied Geology, School of Engineering and Science, Curtin University of Technology, CDT 250, 98009, Miri, Sarawak, MY
5 Universidad Autonoma del Estado de Hidalgo, Centro de Investigaciones en Ciencias de la Tierra, Ciudad Universitaria, Carretera Pachuca-Tulancingo Km. 4.5, 42184 Pachuca, Hidalgo,, MX
1 Instituto de Ciencias del Mar y Limnologia, Unidad de Geologia Marina y Ambiental, Universidad Nacional Autonoma de Mexico, Circuito Exterior s/n, 04510, Mexico D.F., MX
2 Estacion Regional del Noroeste, Instituto de Geologia, Universidad Nacional Autonoma de Mexico, Hermosillo 83000, Sonora, MX
3 Nucleo de Estudos Geoquimicos e Laboratorio de Isotopos Estaveis (NEG - LABISE), Departmento de Geologia, Universidade Federal de Pernambuco, Caixa Posta 7852, 50670-000 Recife, BR
4 Department of Applied Geology, School of Engineering and Science, Curtin University of Technology, CDT 250, 98009, Miri, Sarawak, MY
5 Universidad Autonoma del Estado de Hidalgo, Centro de Investigaciones en Ciencias de la Tierra, Ciudad Universitaria, Carretera Pachuca-Tulancingo Km. 4.5, 42184 Pachuca, Hidalgo,, MX