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Your search keyword '"tectonic versus climatic control"' showing total 3 results
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3 results on '"tectonic versus climatic control"'

1. Evolution of the Upper Yellow River as Revealed by Changes in Heavy-Mineral and Geochemical (REE) Signatures of Fluvial Terraces (Lanzhou, China)

Author

Katharina Pfaff, Xiaofei Hu, Haobo Zhang, Baotian Pan, Wenbin Peng, Sergio Andò, Junsheng Nie, Eduardo Garzanti, Zhao Wang, Wang, Z, Zhang, H, Garzanti, E, Nie, J, Peng, W, Ando, S, Hu, X, Pan, B, and Pfaff, K

Subjects
Provenance, lcsh:QE351-399.2, 010504 meteorology & atmospheric sciences, Geochemistry, Fluvial, 010502 geochemistry & geophysics, 01 natural sciences, Deposition (geology), early-middle Pleistocene transition, provenance analysis, 0105 earth and related environmental sciences, Provenance analysi, geography, lcsh:Mineralogy, geography.geographical_feature_category, Plateau, Heavy mineral, Yellow River terraces, Sediment, Geology, Lanzhou (northern China), Geotechnical Engineering and Engineering Geology, Terrace (geology), Period (geology), tectonic versus climatic control, Yellow River terrace
Abstract

Despite decades of study, the factors that controlled the formation and evolution of theupper reaches of the Yellow River, including uplift of the northeastern Tibetan Plateau, Pliocene-Pleistocene climate change, and autogenetic processes are still poorly constrained. The stratigraphicrecord of such paleogeographic evolution is recorded in the sequence of nine terraces formed duringprogressive incision of the Yellow River in the last 1.7 Ma. This article investigates in detail forsediment provenance in terraces of the Lanzhou area, based on heavy-mineral and geochemical(REE) signatures. Two main provenance changes are identified, pointing each to a majorpaleogeographic reorganization coupled with expansion of the upper Yellow River catchment andenhanced sediment fluxes. The first change took place between the deposition of terrace T9 (formedaround 1.7 Ma) and terrace T8 (formed around 1.5 Ma), when rapid fluvial incision point to tectoniccontrol and active uplift of northeastern Tibetan Plateau. The second change took place betweendeposition of terrace T4 (formed around 0.86 Ma) and terrace T3 (formed around 0.14 Ma), duringa period of low incision rates and notably enhanced sediment fluxes as a response to enhanced EastAsian Summer Monsoon and consequently increased precipitations, pointing instead chiefly toclimatic control.

Published
2019
Full Text
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2. Evolution of the upper yellow river as revealed by changes in heavy-mineral and geochemical (Ree) signatures of fluvial terraces (Lanzhou, China)

Author

Wang, Z, Zhang, H, Garzanti, E, Nie, J, Peng, W, Ando, S, Hu, X, Pan, B, Pfaff, K, Wang Z., Zhang H., Garzanti E., Nie J., Peng W., Ando S., Hu X., Pan B., Pfaff K., Wang, Z, Zhang, H, Garzanti, E, Nie, J, Peng, W, Ando, S, Hu, X, Pan, B, Pfaff, K, Wang Z., Zhang H., Garzanti E., Nie J., Peng W., Ando S., Hu X., Pan B., and Pfaff K.

Abstract

Despite decades of study, the factors that controlled the formation and evolution of the upper reaches of the Yellow River, including uplift of the northeastern Tibetan Plateau, Pliocene- Pleistocene climate change, and autogenetic processes are still poorly constrained. The stratigraphic record of such paleogeographic evolution is recorded in the sequence of nine terraces formed during progressive incision of the Yellow River in the last 1.7 Ma. This article investigates in detail for sediment provenance in terraces of the Lanzhou area, based on heavy-mineral and geochemical (REE) signatures. Two main provenance changes are identified, pointing each to a major paleogeographic reorganization coupled with expansion of the upper Yellow River catchment and enhanced sediment fluxes. The first change took place between the deposition of terrace T9 (formed around 1.7 Ma) and terrace T8 (formed around 1.5 Ma), when rapid fluvial incision point to tectonic control and active uplift of northeastern Tibetan Plateau. The second change took place between deposition of terrace T4 (formed around 0.86 Ma) and terrace T3 (formed around 0.14 Ma), during a period of low incision rates and notably enhanced sediment fluxes as a response to enhanced East Asian Summer Monsoon and consequently increased precipitations, pointing instead chiefly to climatic control.

Published
2019

3. Evolution of the Upper Yellow River as Revealed by Changes in Heavy-Mineral and Geochemical (REE) Signatures of Fluvial Terraces (Lanzhou, China).

Author

Wang, Zhao, Zhang, Haobo, Garzanti, Eduardo, Nie, Junsheng, Peng, Wenbin, Andò, Sergio, Hu, Xiaofei, Pan, Baotian, and Pfaff, Katharina

Subjects
FLUVIAL geomorphology, PROVENANCE (Geology), TERRACING, WATERSHEDS, RARE earth metals, RIVERS, BIOLOGICAL evolution
Abstract

Despite decades of study, the factors that controlled the formation and evolution of the upper reaches of the Yellow River, including uplift of the northeastern Tibetan Plateau, Pliocene-Pleistocene climate change, and autogenetic processes are still poorly constrained. The stratigraphic record of such paleogeographic evolution is recorded in the sequence of nine terraces formed during progressive incision of the Yellow River in the last 1.7 Ma. This article investigates in detail for sediment provenance in terraces of the Lanzhou area, based on heavy-mineral and geochemical (REE) signatures. Two main provenance changes are identified, pointing each to a major paleogeographic reorganization coupled with expansion of the upper Yellow River catchment and enhanced sediment fluxes. The first change took place between the deposition of terrace T9 (formed around 1.7 Ma) and terrace T8 (formed around 1.5 Ma), when rapid fluvial incision point to tectonic control and active uplift of northeastern Tibetan Plateau. The second change took place between deposition of terrace T4 (formed around 0.86 Ma) and terrace T3 (formed around 0.14 Ma), during a period of low incision rates and notably enhanced sediment fluxes as a response to enhanced East Asian Summer Monsoon and consequently increased precipitations, pointing instead chiefly to climatic control. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

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