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Rixiang Zhu - One of the best experts on this subject based on the ideXlab platform.
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40ar 39ar dating results from the shijiatun formation jiaolai basin new age constraints on the cretaceous terrestrial volcanic Sedimentary Sequence of china
Cretaceous Research, 2018Co-Authors: Chenglong Deng, Yongxin Pan, Chengshan Wang, Dewen Zheng, Rixiang ZhuAbstract:Abstract We provide a stringent age constraint on the Upper Cretaceous terrestrial strata based on 40 Ar/ 39 Ar dating of a continuous volcanic-Sedimentary Sequence drilled from Jiaolai Basin in Shandong Province, eastern China. The volcanic-Sedimentary Sequence, which is mainly composed of basaltic rocks interbedded with thin-bedded siltstone and fine sandstone, comprises the depth interval from 614 to 769 m of the Cretaceous Continental Scientific Drilling borehole (CCSD-LK-I), and belongs to Member S5 of the Shijiatun Formation by lithostratigraphic division. 40 Ar/ 39 Ar dating of the basalts from CCSD-LK-I yielded a latest age of 73.5 ± 1.1 Ma at 614 m depth and a basal age of 79.7 ± 2.7 Ma at 757 m depth, corresponding to Campanian in age. Magnetostratigraphy revealed a correlation with the geomagnetic polarity time scale from lower Chron C33n to lower Chron C32n.2n, further demonstrating that the terrestrial volcanic-Sedimentary Sequence of the Shijiatun Formation is of middle-late Campanian age. The established chronological framework allows the interregional correlation of Member S5 of the Shijiatun Formation in Jiaolai Basin to the strata from other basins in northeastern China, northwestern China and central-southern China. In addition, the 40 Ar/ 39 Ar age of 73.5 ± 1.1 Ma from the topmost basalt of the Shijiatun Formation indicates that the age of the overlying Jiaozhou Formation is younger than Campanian, and it also supports the location of the K/Pg boundary within the depth interval of 450–520 m in borehole CCSD-LK-I.
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40Ar/39Ar dating results from the Shijiatun Formation, Jiaolai Basin: New age constraints on the Cretaceous terrestrial volcanic-Sedimentary Sequence of China
Cretaceous Research, 2018Co-Authors: Chenglong Deng, Yongxin Pan, Chengshan Wang, Dewen Zheng, Rixiang ZhuAbstract:Abstract We provide a stringent age constraint on the Upper Cretaceous terrestrial strata based on 40 Ar/ 39 Ar dating of a continuous volcanic-Sedimentary Sequence drilled from Jiaolai Basin in Shandong Province, eastern China. The volcanic-Sedimentary Sequence, which is mainly composed of basaltic rocks interbedded with thin-bedded siltstone and fine sandstone, comprises the depth interval from 614 to 769 m of the Cretaceous Continental Scientific Drilling borehole (CCSD-LK-I), and belongs to Member S5 of the Shijiatun Formation by lithostratigraphic division. 40 Ar/ 39 Ar dating of the basalts from CCSD-LK-I yielded a latest age of 73.5 ± 1.1 Ma at 614 m depth and a basal age of 79.7 ± 2.7 Ma at 757 m depth, corresponding to Campanian in age. Magnetostratigraphy revealed a correlation with the geomagnetic polarity time scale from lower Chron C33n to lower Chron C32n.2n, further demonstrating that the terrestrial volcanic-Sedimentary Sequence of the Shijiatun Formation is of middle-late Campanian age. The established chronological framework allows the interregional correlation of Member S5 of the Shijiatun Formation in Jiaolai Basin to the strata from other basins in northeastern China, northwestern China and central-southern China. In addition, the 40 Ar/ 39 Ar age of 73.5 ± 1.1 Ma from the topmost basalt of the Shijiatun Formation indicates that the age of the overlying Jiaozhou Formation is younger than Campanian, and it also supports the location of the K/Pg boundary within the depth interval of 450–520 m in borehole CCSD-LK-I.
Chenglong Deng - One of the best experts on this subject based on the ideXlab platform.
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40ar 39ar dating results from the shijiatun formation jiaolai basin new age constraints on the cretaceous terrestrial volcanic Sedimentary Sequence of china
Cretaceous Research, 2018Co-Authors: Chenglong Deng, Yongxin Pan, Chengshan Wang, Dewen Zheng, Rixiang ZhuAbstract:Abstract We provide a stringent age constraint on the Upper Cretaceous terrestrial strata based on 40 Ar/ 39 Ar dating of a continuous volcanic-Sedimentary Sequence drilled from Jiaolai Basin in Shandong Province, eastern China. The volcanic-Sedimentary Sequence, which is mainly composed of basaltic rocks interbedded with thin-bedded siltstone and fine sandstone, comprises the depth interval from 614 to 769 m of the Cretaceous Continental Scientific Drilling borehole (CCSD-LK-I), and belongs to Member S5 of the Shijiatun Formation by lithostratigraphic division. 40 Ar/ 39 Ar dating of the basalts from CCSD-LK-I yielded a latest age of 73.5 ± 1.1 Ma at 614 m depth and a basal age of 79.7 ± 2.7 Ma at 757 m depth, corresponding to Campanian in age. Magnetostratigraphy revealed a correlation with the geomagnetic polarity time scale from lower Chron C33n to lower Chron C32n.2n, further demonstrating that the terrestrial volcanic-Sedimentary Sequence of the Shijiatun Formation is of middle-late Campanian age. The established chronological framework allows the interregional correlation of Member S5 of the Shijiatun Formation in Jiaolai Basin to the strata from other basins in northeastern China, northwestern China and central-southern China. In addition, the 40 Ar/ 39 Ar age of 73.5 ± 1.1 Ma from the topmost basalt of the Shijiatun Formation indicates that the age of the overlying Jiaozhou Formation is younger than Campanian, and it also supports the location of the K/Pg boundary within the depth interval of 450–520 m in borehole CCSD-LK-I.
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40Ar/39Ar dating results from the Shijiatun Formation, Jiaolai Basin: New age constraints on the Cretaceous terrestrial volcanic-Sedimentary Sequence of China
Cretaceous Research, 2018Co-Authors: Chenglong Deng, Yongxin Pan, Chengshan Wang, Dewen Zheng, Rixiang ZhuAbstract:Abstract We provide a stringent age constraint on the Upper Cretaceous terrestrial strata based on 40 Ar/ 39 Ar dating of a continuous volcanic-Sedimentary Sequence drilled from Jiaolai Basin in Shandong Province, eastern China. The volcanic-Sedimentary Sequence, which is mainly composed of basaltic rocks interbedded with thin-bedded siltstone and fine sandstone, comprises the depth interval from 614 to 769 m of the Cretaceous Continental Scientific Drilling borehole (CCSD-LK-I), and belongs to Member S5 of the Shijiatun Formation by lithostratigraphic division. 40 Ar/ 39 Ar dating of the basalts from CCSD-LK-I yielded a latest age of 73.5 ± 1.1 Ma at 614 m depth and a basal age of 79.7 ± 2.7 Ma at 757 m depth, corresponding to Campanian in age. Magnetostratigraphy revealed a correlation with the geomagnetic polarity time scale from lower Chron C33n to lower Chron C32n.2n, further demonstrating that the terrestrial volcanic-Sedimentary Sequence of the Shijiatun Formation is of middle-late Campanian age. The established chronological framework allows the interregional correlation of Member S5 of the Shijiatun Formation in Jiaolai Basin to the strata from other basins in northeastern China, northwestern China and central-southern China. In addition, the 40 Ar/ 39 Ar age of 73.5 ± 1.1 Ma from the topmost basalt of the Shijiatun Formation indicates that the age of the overlying Jiaozhou Formation is younger than Campanian, and it also supports the location of the K/Pg boundary within the depth interval of 450–520 m in borehole CCSD-LK-I.
Nicolas Thouveny - One of the best experts on this subject based on the ideXlab platform.
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evidence for multiple paleomagnetic intensity lows between 30 and 50 ka bp from a western equatorial pacific Sedimentary Sequence
Quaternary Science Reviews, 2006Co-Authors: Cecile L Blanchet, Nicolas Thouveny, Thibault De GaridelthoronAbstract:Abstract A paleomagnetic study was carried out on the radiocarbon dated MD97-2134 core located in the western Equatorial Pacific (Southern Papua New Guinea margin). Rock magnetic investigations revealed changes of the magnetic mineralogy along the hemi-pelagic Sedimentary Sequence but the reconstruction of past direction and relative paleointensity variations of the geomagnetic field remained feasible. Four successive paleointensity drops are recorded between 30 and 50 ka BP. The largest one is associated with an abrupt swing of declination and inclination interpreted as a smoothed signature of the Laschamp excursion (∼41 ka BP). The succession of four events of weak intensity between 30 and 50 ka BP introduces a complex behaviour of the geomagnetic field in the time interval spanning over the Laschamp and the Mono Lake excursions.
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Evidence for multiple paleomagnetic intensity lows between 30 and 50 ka BP from a western Equatorial Pacific Sedimentary Sequence
Quaternary Science Reviews, 2006Co-Authors: Cl Blanchet, Nicolas Thouveny, Thibault De Garidel-thoronAbstract:A paleomagnetic study was carried out on the radiocarbon dated MD97-2134 core located in the western Equatorial Pacific (Southern Papua New Guinea margin). Rock magnetic investigations revealed changes of the magnetic mineralogy along the hemi-pelagic Sedimentary Sequence but the reconstruction of past direction and relative paleointensity variations of the geomagnetic field remained feasible. Four successive paleointensity drops are recorded between 30 and 50 ka BP. The largest one is associated with an abrupt swing of declination and inclination interpreted as a smoothed signature of the Laschamp excursion (similar to 41 ka BP). The Succession of four events of weak intensity between 30 and 50 ka BP introduces a complex behaviour of the geomagnetic field in the time interval spanning over the Laschamp and the Mono Lake excursions. (c) 2005 Elsevier Ltd. All rights reserved.
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revised magnetostratigraphy of the plio pleistocene Sedimentary Sequence of the olduvai formation tanzania
Palaeogeography Palaeoclimatology Palaeoecology, 1995Co-Authors: Endale Tamrat, Nicolas Thouveny, Neil D OpdykeAbstract:Abstract The magnetic stratigraphy of the Plio-Pleistocene Sedimentary formation of the Olduvai Gorge (Tanzania), which contains a well known series of prehistoric pebble cultures and hominid remains, has been reinvestigated. Sixty one sites were sampled along 90 metres of stratigraphic section extending from the base of Bed I into the Masek Beds. Palaeo- and rock-magnetic analyses reveal that magnetizations are stable, carried by low coercivity magnetic minerals (titano-magnetites) and are likely to be of depositional origin. A revised magnetostratigraphic scale is proposed. The base of the major normal magnetozone, N1, interpreted as the Olduvai sub-chron, lies ca 6 m below Tuff IA, i.e. significantly below the previously defined position. This revision, associated to 40Ar/39Ar ages recently determined on the Tuffs of Bed I, supports the validity of the astronomical calibration of the geomagnetic polarity time scale for the Olduvai sub-chron. The correlation of the normal magnetozone N2 with Jaramillo (or Jaramillo + Cobb Mountain), is suggested by the discovery of a reverse magnetozone (R3) in the uppermost part of the Pleistocene Sequence (Masek Beds), and implies that the fossiliferous Sequence of the Olduvai Formation was entirely deposited before the Brunhes/Matuyama boundary.
Dewen Zheng - One of the best experts on this subject based on the ideXlab platform.
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40ar 39ar dating results from the shijiatun formation jiaolai basin new age constraints on the cretaceous terrestrial volcanic Sedimentary Sequence of china
Cretaceous Research, 2018Co-Authors: Chenglong Deng, Yongxin Pan, Chengshan Wang, Dewen Zheng, Rixiang ZhuAbstract:Abstract We provide a stringent age constraint on the Upper Cretaceous terrestrial strata based on 40 Ar/ 39 Ar dating of a continuous volcanic-Sedimentary Sequence drilled from Jiaolai Basin in Shandong Province, eastern China. The volcanic-Sedimentary Sequence, which is mainly composed of basaltic rocks interbedded with thin-bedded siltstone and fine sandstone, comprises the depth interval from 614 to 769 m of the Cretaceous Continental Scientific Drilling borehole (CCSD-LK-I), and belongs to Member S5 of the Shijiatun Formation by lithostratigraphic division. 40 Ar/ 39 Ar dating of the basalts from CCSD-LK-I yielded a latest age of 73.5 ± 1.1 Ma at 614 m depth and a basal age of 79.7 ± 2.7 Ma at 757 m depth, corresponding to Campanian in age. Magnetostratigraphy revealed a correlation with the geomagnetic polarity time scale from lower Chron C33n to lower Chron C32n.2n, further demonstrating that the terrestrial volcanic-Sedimentary Sequence of the Shijiatun Formation is of middle-late Campanian age. The established chronological framework allows the interregional correlation of Member S5 of the Shijiatun Formation in Jiaolai Basin to the strata from other basins in northeastern China, northwestern China and central-southern China. In addition, the 40 Ar/ 39 Ar age of 73.5 ± 1.1 Ma from the topmost basalt of the Shijiatun Formation indicates that the age of the overlying Jiaozhou Formation is younger than Campanian, and it also supports the location of the K/Pg boundary within the depth interval of 450–520 m in borehole CCSD-LK-I.
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40Ar/39Ar dating results from the Shijiatun Formation, Jiaolai Basin: New age constraints on the Cretaceous terrestrial volcanic-Sedimentary Sequence of China
Cretaceous Research, 2018Co-Authors: Chenglong Deng, Yongxin Pan, Chengshan Wang, Dewen Zheng, Rixiang ZhuAbstract:Abstract We provide a stringent age constraint on the Upper Cretaceous terrestrial strata based on 40 Ar/ 39 Ar dating of a continuous volcanic-Sedimentary Sequence drilled from Jiaolai Basin in Shandong Province, eastern China. The volcanic-Sedimentary Sequence, which is mainly composed of basaltic rocks interbedded with thin-bedded siltstone and fine sandstone, comprises the depth interval from 614 to 769 m of the Cretaceous Continental Scientific Drilling borehole (CCSD-LK-I), and belongs to Member S5 of the Shijiatun Formation by lithostratigraphic division. 40 Ar/ 39 Ar dating of the basalts from CCSD-LK-I yielded a latest age of 73.5 ± 1.1 Ma at 614 m depth and a basal age of 79.7 ± 2.7 Ma at 757 m depth, corresponding to Campanian in age. Magnetostratigraphy revealed a correlation with the geomagnetic polarity time scale from lower Chron C33n to lower Chron C32n.2n, further demonstrating that the terrestrial volcanic-Sedimentary Sequence of the Shijiatun Formation is of middle-late Campanian age. The established chronological framework allows the interregional correlation of Member S5 of the Shijiatun Formation in Jiaolai Basin to the strata from other basins in northeastern China, northwestern China and central-southern China. In addition, the 40 Ar/ 39 Ar age of 73.5 ± 1.1 Ma from the topmost basalt of the Shijiatun Formation indicates that the age of the overlying Jiaozhou Formation is younger than Campanian, and it also supports the location of the K/Pg boundary within the depth interval of 450–520 m in borehole CCSD-LK-I.
Yongxin Pan - One of the best experts on this subject based on the ideXlab platform.
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40ar 39ar dating results from the shijiatun formation jiaolai basin new age constraints on the cretaceous terrestrial volcanic Sedimentary Sequence of china
Cretaceous Research, 2018Co-Authors: Chenglong Deng, Yongxin Pan, Chengshan Wang, Dewen Zheng, Rixiang ZhuAbstract:Abstract We provide a stringent age constraint on the Upper Cretaceous terrestrial strata based on 40 Ar/ 39 Ar dating of a continuous volcanic-Sedimentary Sequence drilled from Jiaolai Basin in Shandong Province, eastern China. The volcanic-Sedimentary Sequence, which is mainly composed of basaltic rocks interbedded with thin-bedded siltstone and fine sandstone, comprises the depth interval from 614 to 769 m of the Cretaceous Continental Scientific Drilling borehole (CCSD-LK-I), and belongs to Member S5 of the Shijiatun Formation by lithostratigraphic division. 40 Ar/ 39 Ar dating of the basalts from CCSD-LK-I yielded a latest age of 73.5 ± 1.1 Ma at 614 m depth and a basal age of 79.7 ± 2.7 Ma at 757 m depth, corresponding to Campanian in age. Magnetostratigraphy revealed a correlation with the geomagnetic polarity time scale from lower Chron C33n to lower Chron C32n.2n, further demonstrating that the terrestrial volcanic-Sedimentary Sequence of the Shijiatun Formation is of middle-late Campanian age. The established chronological framework allows the interregional correlation of Member S5 of the Shijiatun Formation in Jiaolai Basin to the strata from other basins in northeastern China, northwestern China and central-southern China. In addition, the 40 Ar/ 39 Ar age of 73.5 ± 1.1 Ma from the topmost basalt of the Shijiatun Formation indicates that the age of the overlying Jiaozhou Formation is younger than Campanian, and it also supports the location of the K/Pg boundary within the depth interval of 450–520 m in borehole CCSD-LK-I.
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40Ar/39Ar dating results from the Shijiatun Formation, Jiaolai Basin: New age constraints on the Cretaceous terrestrial volcanic-Sedimentary Sequence of China
Cretaceous Research, 2018Co-Authors: Chenglong Deng, Yongxin Pan, Chengshan Wang, Dewen Zheng, Rixiang ZhuAbstract:Abstract We provide a stringent age constraint on the Upper Cretaceous terrestrial strata based on 40 Ar/ 39 Ar dating of a continuous volcanic-Sedimentary Sequence drilled from Jiaolai Basin in Shandong Province, eastern China. The volcanic-Sedimentary Sequence, which is mainly composed of basaltic rocks interbedded with thin-bedded siltstone and fine sandstone, comprises the depth interval from 614 to 769 m of the Cretaceous Continental Scientific Drilling borehole (CCSD-LK-I), and belongs to Member S5 of the Shijiatun Formation by lithostratigraphic division. 40 Ar/ 39 Ar dating of the basalts from CCSD-LK-I yielded a latest age of 73.5 ± 1.1 Ma at 614 m depth and a basal age of 79.7 ± 2.7 Ma at 757 m depth, corresponding to Campanian in age. Magnetostratigraphy revealed a correlation with the geomagnetic polarity time scale from lower Chron C33n to lower Chron C32n.2n, further demonstrating that the terrestrial volcanic-Sedimentary Sequence of the Shijiatun Formation is of middle-late Campanian age. The established chronological framework allows the interregional correlation of Member S5 of the Shijiatun Formation in Jiaolai Basin to the strata from other basins in northeastern China, northwestern China and central-southern China. In addition, the 40 Ar/ 39 Ar age of 73.5 ± 1.1 Ma from the topmost basalt of the Shijiatun Formation indicates that the age of the overlying Jiaozhou Formation is younger than Campanian, and it also supports the location of the K/Pg boundary within the depth interval of 450–520 m in borehole CCSD-LK-I.
