Surface pollen assemblages from different sedimentary environments in the Yinchuan Basin, North China, and their significance for stratigraphic pollen records

2021 ◽  
Vol 583 ◽  
pp. 103-109
Author(s):  
Xinling Li ◽  
Mingjian Wei ◽  
Shengrui Zhang ◽  
Maotang Cai ◽  
Junping Wang
Keyword(s):  
North China ◽  
Surface Pollen ◽  
Sedimentary Environments ◽  
Yinchuan Basin ◽  
Pollen Records

Palaeogene–Neogene sedimentary and tectonic evolution of the Yinchuan Basin, western North China Craton

2019 ◽  
Vol 62 (1) ◽  
pp. 53-71 ◽  
Author(s):  
Xiao-Bo Liu ◽  
Jian-Min Hu ◽  
Wei Shi ◽  
Hong Chen ◽  
Ji-Yuan Yan
Keyword(s):  
North China Craton ◽  
Tectonic Evolution ◽  
North China ◽  
Yinchuan Basin

scholarly journals Establishing a common standardised growth curve for single-aliquot OSL dating of quartz from sediments in the Jilantai area of North China

2020 ◽  
Vol 47 (1) ◽  
pp. 71-92
Author(s):  
Zhenjun Li ◽  
Xuesong Mou ◽  
Yuxin Fan ◽  
Qingsong Zhang ◽  
Guangliang Yang ◽  
...  
Keyword(s):  
Least Squares ◽  
Growth Curve ◽  
Dose Response ◽  
North China ◽  
Dose Range ◽  
Optically Stimulated Luminescence ◽  
Osl Dating ◽  
Response Curves ◽  
Sedimentary Environments ◽  
Saturation Dose

AbstractEstablishing a common standardised growth curve (SGC) can substantially reduce the instrumental time for equivalent-dose (De) measurements in optically stimulated luminescence (OSL) dating. Several studies have indicated that different samples have different dose–response curves (DRCs) and therefore that it is difficult to construct a common SGC, although an SGC has been proposed in some cases. In this study, our aims were to construct a regional SGC based on small aliquots of sedimentary quartz from more than 100 samples from different sedimentary environments in the Jilantai Basin in North China and to investigate the applicability of different methods of establishing an SGC for the area. The precision of the De values of aliquots which were obtained using the SGC was compared with those obtained using the single-aliquot regenerative (SAR) protocol. Our results indicate the following: (1) for establishing an SGC using the regenerative normalisation (Re-SGC) method, selecting a suitable re-normalisation dose that is close to double the characteristic saturation dose, 2D0, can reduce the inter-aliquot/inter-sample variation in the form of DRCs within a larger dose range. (2) A common regional SGC can be established for the Jilantai area using the Re-SGC and least-squares normalisation (LS-SGC) methods, which provides reliable dating results within the 200 Gy De range.

scholarly journals Carbon and Oxygen Isotopic Stratigraphy of Mesoproterozoic Carbonate Sequences (1.6–1.4 Ga) from Yanshan in North China

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
Kuang Hongwei ◽  
Liu Yongqing ◽  
Li Jiahua ◽  
Peng Nan ◽  
Luo Shunshe ◽  
...  
Keyword(s):  
Oxygen Isotope ◽  
North China ◽  
Geochemical Background ◽  
Abrupt Decrease ◽  
Sea Level Fluctuations ◽  
Sedimentary Environments ◽  
Isotopic Shifts ◽  
Carbon And Oxygen Isotope ◽  
Positive Variation ◽  
Oxygen Isotopic

In Yanshan, located in the northern part of North China, Mesoproterozoic carbonate sequences (1.6–1.4 Ga) form a 10, 000 m thick succession in an aulacogen basin. Carbon and oxygen isotope (δ13O and δ18O, resp.) data were obtained from 110 carbonate samples across three sections of these Mesoproterozoic deposits. From the early to late Mesoproterozoic, low negative values of δ13O appear, followed by low positive variation and then a stable increase. An abrupt decrease in δ13O values, with subsequent rapid increase, is found at the end of the Mesoproterozoic. During the whole Mesoproterozoic, δ18O shows a mainly negative trend and occasional highly negative isotopic shifts (from lower to upper deposits). Whole-rock carbon and oxygen isotopic compositions and profiles must be studied to provide a paleogeochemical record that can be associated with paleocean sedimentary environments, temperature, biological productivity, and sea-level fluctuations. Results of the present study correlate well with other international carbon and oxygen isotope profiles, suggesting that a global marine geochemical system existed during the interval of 1.6–1.4 Ga under a globally united tectonic, sedimentary, and geochemical background.

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