Integrated analysis for constraining palaeoclimatic and volcanic influences on clay-mineral assemblages in orogenic basins (Palaeogene Andean foreland, Northwestern Argentina)
Variations in clay-mineral assemblages in ancient continental deposits are frequently used to reconstruct past climate changes. In active settings, volcanic events can supply highly labile volcaniclastic material, which can easily be transformed into smectite via diagenesis, which can produce a noti...
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2010
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| LEADER | 21146caa a22014177a 4500 | ||
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| 001 | PAPER-7771 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518203732.0 | ||
| 008 | 190411s2010 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-77954213782 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a Do Campo, M. | |
| 245 | 1 | 0 | |a Integrated analysis for constraining palaeoclimatic and volcanic influences on clay-mineral assemblages in orogenic basins (Palaeogene Andean foreland, Northwestern Argentina) |
| 260 | |c 2010 | ||
| 270 | 1 | 0 | |m Do Campo, M.; CONICET-U.B.A. Instituto de Geocronología y Geología Isotópica, Facultad de Ciencias Exactas y Naturales, Pabellón INGEIS, Ciudad Universitaria (1428) Buenos Aires, Argentina; email: Docampo@ingeis.uba.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 520 | 3 | |a Variations in clay-mineral assemblages in ancient continental deposits are frequently used to reconstruct past climate changes. In active settings, volcanic events can supply highly labile volcaniclastic material, which can easily be transformed into smectite via diagenesis, which can produce a noticeable footprint in clay-mineral assemblages. Southern Central Andean foreland deposits are appropriate case studies to ascertain whether the climatic signal was preserved in the clay assemblages of their fine-grained sediments as tectonic uplift, volcanism, and sedimentation have been interacting since the Cretaceous. We have studied a 1400-m-thick coarsening-upward Palaeogene succession of the Tin Tin basin (northern Calchaquí Valley, Argentina), applying X-ray diffraction (XRD), electron microscopy, and detailed sedimentary facies analysis with the aim of comparing tendencies in the vertical fluctuations of clay minerals with evidence from sedimentological facies.Illite-muscovite plus smectite account for 78% to 100% of the clay minerals in the fine fraction, with kaolinite and chlorite in subordinate amounts. The vertical variation of sedimentary settings from an overbank/lacustrine domain to fluvial braided plains and an aeolian dune field suggests a gradual increase in aridity upsection. However, smectite abundances do not show a gradual decreasing trend compatible with progressively lower hydrolyzing conditions; their relative abundances vary widely throughout the section, depicting pulse-like, abrupt fluctuations. Despite the absence of field evidence for volcanic influence, several indications of volcanic and volcaniclastic material have been found under scanning electron microscopy (SEM) in levels with high smectite abundances from the middle to the top of the succession. They include quartz crystals showing embayments and skeletal forms, with smectite filling the voids, microcrystalline silica, as well as heulandite crystals in close association with authigenic smectite. The XRD analyses of these levels evidence well-crystallized smectite, which is characteristic of a volcaniclastic origin. Therefore, the increase in smectite abundance in these beds reflects a significant volcaniclastic contribution, which is also evidenced by a centimetre-thick ash layer topward in the sequence. The only smectite-rich level near the base of the Tin Tin section also contains well-crystallized smectite associated with heulandite, thus probably evidencing volcaniclastic input. We infer that most of the smectite in these sediments formed during early diagenesis, probably through the dissolution of labile tuffaceous material. Textural and morphological analysis by SEM is essential to determine whether clay-mineral assemblages could be interpreted in terms of palaeoclimate. © 2010 Elsevier B.V. |l eng | |
| 536 | |a Detalles de la financiación: PIP 0781, ANCyT - PICT 2006-381, CGL2007-66744-C02-01 | ||
| 536 | |a Detalles de la financiación: A/5120/06, A/7712/07 | ||
| 536 | |a Detalles de la financiación: Ministerio de Ciencia y Tecnología, MICYT | ||
| 536 | |a Detalles de la financiación: This work was partially financed by CONICET - PIP 0781 and ANCyT - PICT 2006-381 grants and Research Project CGL2007-66744-C02-01 ( Spanish Ministry of Science and Technology ). The stay of M. Do Campo at the University of Granada and the field work of Fernando Nieto in Argentina were supported by AECI projects A/5120/06 and A/7712/07 . The authors are grateful to Parques Nacionales Salta and the park guards of Los Cardones National Park for their collaboration in the research carried out in that park. We also thank Christine Laurin for revising the English text. The authors are grateful to M. Inglès and an anonymous reviewer for their valuable and constructive comments. | ||
| 593 | |a CONICET-U.B.A. Instituto de Geocronología y Geología Isotópica, Facultad de Ciencias Exactas y Naturales, Pabellón INGEIS, Ciudad Universitaria (1428) Buenos Aires, Argentina | ||
| 593 | |a CONICET-Universidad Nacional de Salta, Buenos Aires 177, 4400 Salta, Argentina | ||
| 593 | |a Departamento de Mineralogía y Petrología and I.A.C.T., Universidad de Granada-CSIC, Avda. Fuentenueva s/n, 18002-Granada, Spain | ||
| 690 | 1 | 0 | |a CLAY MINERALS |
| 690 | 1 | 0 | |a FORELAND BASINS |
| 690 | 1 | 0 | |a SMECTITE |
| 690 | 1 | 0 | |a VOLCANICLASTIC MATERIAL |
| 690 | 1 | 0 | |a CLAY MINERAL |
| 690 | 1 | 0 | |a DEPOSITIONAL SEQUENCE |
| 690 | 1 | 0 | |a DIAGENESIS |
| 690 | 1 | 0 | |a FACIES ANALYSIS |
| 690 | 1 | 0 | |a FINE GRAINED SEDIMENT |
| 690 | 1 | 0 | |a FORELAND BASIN |
| 690 | 1 | 0 | |a PALEOCLIMATE |
| 690 | 1 | 0 | |a PALEOGENE |
| 690 | 1 | 0 | |a SMECTITE |
| 690 | 1 | 0 | |a VOLCANICLASTIC DEPOSIT |
| 651 | 4 | |a NORTHWEST ARGENTINA | |
| 651 | 4 | |a ARGENTINA | |
| 700 | 1 | |a del Papa, C. | |
| 700 | 1 | |a Nieto, F. | |
| 700 | 1 | |a Hongn, F. | |
| 700 | 1 | |a Petrinovic, I. | |
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