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Source and composition of sedimentary organic matter in the head of Three Gorges Reservoir: a multiproxy approach using δ13C, lignin phenols, and lipid biomarker analyses
Springer Science and Business Media LLC - Tập 36 - Trang 452-455 - 2017
He Ding, Changfeng Zhu, Kai Zhang, Shangbin Xiao, Xingqian Cui, Yongge Sun
A multiproxy approach including bulk organic carbon, δ13C, lignin phenols, and lipid biomarker analyses were applied to characterize the source and composition of sedimentary organic matter in the head part of Three Gorges Reservoir. OM consisted of both natural (autochthonous and allochthonous) and anthropogenic inputs. The natural OM included input from vascular plants, especially non-woody angi... hiện toàn bộ
Triple oxygen isotope constraints on the origin of ocean island basalts
Springer Science and Business Media LLC - Tập 38 - Trang 327-334 - 2019
Xiaobin Cao, Huiming Bao, Caihong Gao, Yun Liu, Fang Huang, Yongbo Peng, Yining Zhang
Understanding the origin of ocean island basalts (OIB) has important bearings on Earth’s deep mantle. Although it is widely accepted that subducted oceanic crust, as a consequence of plate tectonics, contributes material to OIB’s formation, its exact fraction in OIB’s mantle source remains ambiguous largely due to uncertainties associated with existing geochemical proxies. Here we show, through th... hiện toàn bộ
Petrogenesis, LA-ICP-MS zircon U-Pb geochronology and geodynamic implications of the Kribi metavolcanic rocks, Nyong Group, Congo craton
Springer Science and Business Media LLC - Tập 41 - Trang 470-495 - 2022
Hermine Mvodo, Sylvestre Ganno, Gus Djibril Kouankap Nono, Donald Hermann Fossi, Philomene Estelle Nga Essomba, Marvine Nzepang Tankwa, Jean Paul Nzenti
Metavolcanic rocks are well-exposed in the Kribi area within the Nyong Group, Congo craton, but their origin, age, and tectonic significance are poorly known. Here we report integrated field mapping and petrography, geochemistry, and LA-ICP-MS zircon U-Pb ages of these metavolcanic rocks to constrain their petrogenesis and geodynamic implications. The studied rocks consist of mafic granulite, garn... hiện toàn bộ
Sự tuyệt chủng hàng loạt ở cuối kỷ Ordovic: do sự nóng lên hay làm mát toàn cầu? Dịch bởi AI
Springer Science and Business Media LLC - Tập 39 - Trang 595-598 - 2020
Renqiang Liao, Weidong Sun
Sự tuyệt chủng hàng loạt ở cuối kỷ Ordovic (LOME) là sự kiện tuyệt chủng toàn cầu đầu tiên với sự tiêu diệt 85% các loài sinh vật biển. Tuy nhiên, nguyên nhân của LOME vẫn còn gây tranh cãi. Hầu hết các nghiên cứu cho rằng nó là do sự hoạt động đáng kể của núi lửa do sự làm lạnh hoặc ấm lên toàn cầu. Thông qua việc phân tích sự khác biệt động lực giữa làm lạnh và ấm lên toàn cầu lên magmatism quy ... hiện toàn bộ
#sự tuyệt chủng hàng loạt #cuối kỷ Ordovic #sự nóng lên toàn cầu #sự làm mát toàn cầu #núi lửa #động lực học #magmatism
Early Silurian Wuchuan–Sihui–Shaoguan exhalative sedimentary pyrite belt, South China: constraints from zircon dating for K-bentonite of the giant Dajiangping deposit
Springer Science and Business Media LLC - Tập 40 - Trang 1-12 - 2020
Yingying Zhang, Taiyi Luo, Tian Gan, Mingzhong Zhou, Xinqiao Han
The Wuchuan–Sihui–Shaoguan (WSS) exhalative sedimentary pyrite belt in the southwestern part of the Qinzhou–Hangzhou (Qin–Hang) belt is the most important sulfur industry base in China. However, a wide range of metallogenetic ages spanning from Ediacaran to Devonian has been reported in the literature. This age range does not support the idea that the typical character of “coeval mineralization” i... hiện toàn bộ
Geochemistry and sediment in the main stream of the Ca River basin, Vietnam: weathering process, solute-discharge relationships, and reservoir impact
Springer Science and Business Media LLC - Tập 38 - Trang 627-641 - 2019
Ho Thi Phuong, Kenji Okubo, Md. Azhar Uddin
In this study, we investigated the chemical composition of dissolved solids in the Ca River basin, North-Central Vietnam. Water samples were collected from August 2017 to July 2018 at three hydrological stations located in the main stream of the Ca River. Carbonate weathering was found as the dominant process controlling the water chemistry in that area. The average concentrations of dissolved sol... hiện toàn bộ
Nitrous oxide (N2O) emissions from a mesotrophic reservoir on the Wujiang River, southwest China
Springer Science and Business Media LLC - Tập 36 - Trang 667-679 - 2017
Xiaolong Liu, Siliang Li, Zhongliang Wang, Guilin Han, Jun Li, Baoli Wang, Fushun Wang, Li Bai
Aquatic ecosystems have been identified as a globally significant source of nitrous oxide (N2O) due to continuous active nitrogen involvement, but the processes and influencing factors that control N2O production are still poorly understood, especially in reservoirs. For that, monthly N2O variations were monitored in Dongfeng reservoir (DFR) with a mesotrophic condition. The dissolved N2O concentr... hiện toàn bộ
The hydrogen and oxygen isotopic compositions of hydroxyl in clay mineral from a weathering profile: New proxies for paleo-climate change?
Springer Science and Business Media LLC - Tập 36 - Trang 370-373 - 2017
Chengfan Yang, Shouye Yang, Ni Su
Recent studies suggest that the hydrogen and oxygen isotopic compositions of clay minerals can indicate paleoclimate. Here, we report mineralogy and stable isotopic records (δD and δ18OOH) of a weathering profile located in the Fujian Province, aiming to validate whether hydroxyl stable isotopes can indicate paleo-precipitation and paleo-temperature. Our results indicate that the δD and δ18OOH cha... hiện toàn bộ
Effects of topography and vegetation on distribution of rare earth elements in calcareous soils
Springer Science and Business Media LLC - Tập 36 - Trang 469-473 - 2017
Zhaoliang Song, Yuntao Wu, Xiaomin Yang, Zijuan Xu, Linan Liu, Xiaodong Zhang, Qian Hao, Shaobo Sun, Guilin Han, Congqiang Liu
This study investigated the impact of topography and vegetation on distribution of rare earth elements (REEs) in calcareous soils using methods of single extraction and mass balance calculation. The purposes of the study were to set a basis for further research on the biogeochemical REE cycle and to provide references for soil–water conservation and REE-containing fertilizer amendments. The result... hiện toàn bộ
Variations of trace elements under hydrological conditions in the Min River, Eastern Tibetan Plateau
Springer Science and Business Media LLC - Tập 37 - Trang 509-518 - 2018
Xuetao Zhu, Yun-chao Lang, Jun Zhong, Hu Ding, Huijun He, Zhifeng Yan, Si-liang Li
In order to better understand the relative importance of hydrologic variation and anthropogenic disturbance and their complex interactions within the trace elemental geochemical cycle, water samples were collected monthly over 1 year in the Min River, eastern Tibetan Plateau, and analyzed for trace element composition. The dissolved trace elements exhibited different relationships with increasing ... hiện toàn bộ
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