Palaeogeography, Palaeoclimatology, Palaeoecology
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#1Eric Otto Walliser (University of Mainz)H-Index: 6
#2Lukas Fröhlich (University of Mainz)
Last. Bernd R. Schöne (University of Mainz)H-Index: 38
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Abstract Inoceramid prisms are among the most common microfossils that can be found in Late Cretaceous strata. Since these biomineral units were formed by sequential accretion in the outer shell layer of the bivalves, they potentially serve as archives of short-term (circa-annual) paleowater temperature fluctuations. In the present study, we tested to what extent intra-prismatic stable isotope variations of individual inoceramid prisms reflect sub-annual δ13C and the δ18O patterns. We obtained m...
#1Emanuele Ziaco (UNR: University of Nevada, Reno)H-Index: 10
#2Nicholas Miley (UNR: University of Nevada, Reno)
Last. Franco Biondi (UNR: University of Nevada, Reno)H-Index: 31
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Abstract The annual cycle of precipitation in the southwestern United States is characterized by a bimodal distribution. El Nino-Southern Oscillation (ENSO) episodes influence cool-season precipitation, while the North American Monsoon (NAM) brings warm-season rainfall to the region. Because the covariability of the two seasons may result in both wet and dry water-year anomalies, we evaluated the long-term contribution of cool and warm-season precipitation to water-year totals using newly collec...
#1Qian Xiao (China University of Geosciences)
#2Zhenbing She (China University of Geosciences)H-Index: 11
Last. DuYuansheng (China University of Geosciences)H-Index: 15
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Abstract The terminal Ediacaran Dengying Formation in the eastern Yangtze Gorges area, South China is well known for hosting diverse Ediacara-type macrofossils and trace fossils. However, the depositional processes of this carbonate succession are still poorly known. Here we present detailed sedimentological data on the Dengying carbonates in four sections across the eastern Yangtze Gorges area, with an emphasis on tempestites in limestones of the Shibantan Member of Dengying Formation that have...
#1F. Garrett Boudinot (INSTAAR: Institute of Arctic and Alpine Research)
Last. Julio SepúlvedaH-Index: 11
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#2Karsten GohlH-Index: 30
Last. Lionel Carter (Victoria University of Wellington)H-Index: 45
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Abstract Sedimentary drifts archive the history of the ocean-bottom current dynamics. Bottom currents associated with the Pacific Deep Western Boundary Current (DWBC) along the submarine continental margin off southern and eastern New Zealand are of particular interest because of their potential to contain records of changes in the SW Pacific circulation. Analysis of multi-channel seismic reflection data from the RV Sonne expedition SO246 together with earlier seismic data enabled us to reconstr...
Abstract Origin of the Neogene fluvial sediments in the Jinshaan Gorge is a significant issue concerned with development of the Yellow River. Field investigation shows that the bedrock topography underneath the Neogene fluvial sediments is an up to 8–10 km-wide valley (The Tanghsien-phase valley). The Tanghsien-phase bedrock valley is made up of two flat terrace surfaces. Altitude evidence shows the Neogene fluvial sediments almost continuously distribute on a successively southward-lowering bed...
#1Yali ChenH-Index: 1
#2Jing Huang (CAS: Chinese Academy of Sciences)H-Index: 15
Last. XueleiChu (CAS: Chinese Academy of Sciences)H-Index: 21
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Abstract The Ediacaran witnessed a significant oxygenation of the Earth's surface in line with the emergence and diversification of early animals, but the redox conditions of the shallow waters during this period are still uncertain. Here, we present geochemical profiles from neritic pelitic siltstones of the Doushantuo Formation at the village of Xiaoyang on the northwestern margin of the Yangtze Platform in South China. Most sediments show moderate to low FeHR/FeT ratios (≤0.38), low FePy/FeHR...
#1Guoqiao Xiao (China University of Geosciences)H-Index: 14
#2Yuqi Sun (China University of Geosciences)
Last. Gaowen Dai (China University of Geosciences)
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Abstract The Yellow River (YR) is one of the longest and most sediment-laden rivers in the world. However, the timing and mechanism of the integration of upstream and downstream reaches of the YR is still debated, with estimates ranging from >34 Ma to ~0.15 Ma. Here we address this debate by studying the detrital-zircon age spectra from three boreholes that penetrate late Miocene sediment in the lower YR floodplain. Our results show a significant provenance change between 1.6 and 1.5 Ma marking ...
#1T. Anhäuser (U of T: University of Toronto)
#2Birgit Sehls (Heidelberg University)
Last. Frank Keppler (Heidelberg University)H-Index: 28
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Abstract Stable hydrogen isotope ratios of lignin methoxyl groups (δ2HLM) of wood have been shown to reflect climate-sensitive δ2H values of precipitation (δ2Hprecip). However, a detailed calibration study between high-resolution δ2HLM and δ2Hprecip data has not been performed yet. Here, we present annually resolved δ2HLM values from nine tree-ring series (derived from four Fagus sylvatica L. trees) collected near a station of the Global Isotope Network of Isotopes in Precipitation (GNIP) and th...
Abstract In epicontinental seas, as well as in oceans, amphidromic systems control tidal movement, acting on coastal dynamics and, therefore, influencing the depositional record. Inland seas were common in Pangea during the Permian. However, estimating the conditions that governed the tide in these seas is highly complex. Although Permian marine deposits are well documented on a regional scale, the tidal behavior in the epicontinental sea has not been analyzed yet. In this work, we present a the...
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