scholarly journals Depositional environments of the Carboniferous-Permian Taiyuan Formation (southern North China Block) as deduced from trace elements and from carbon and oxygen isotopes

2020 ◽  
Author(s):  
Dawei LV ◽  
Guangqing HU ◽  
A.J. (Tom) VAN LOON ◽  
Dun WU
Keyword(s):  
Trace Elements ◽  
Oxygen Isotopes ◽  
North China ◽  
Depositional Environments ◽  
North China Block ◽  
Carbon And Oxygen Isotopes ◽  
Taiyuan Formation

Depositional environments of limestones from the Taiyuan Formation in the North China Block interpreted from REE proxies

2020 ◽  
Vol 35 (2) ◽  
Author(s):  
Dawei Lv ◽  
Wengui Fan ◽  
John I. Ejembi ◽  
Dun Wu ◽  
Dongdong Wang ◽  
...  
Keyword(s):  
North China ◽  
Depositional Environments ◽  
North China Block ◽  
The North ◽  
Taiyuan Formation

Climatic quantification and seasonality of the late MIS 3 in North China: A perspective from carbon and oxygen isotopes of fossil mammal teeth

2021 ◽  
Vol 272 ◽  
pp. 107222
Author(s):  
Xu Wang ◽  
Jing Sun ◽  
Fred J. Longstaffe ◽  
Xuejun Gu ◽  
Shuisheng Du ◽  
...  
Keyword(s):  
Oxygen Isotopes ◽  
North China ◽  
Carbon And Oxygen Isotopes ◽  
Mis 3

scholarly journals Carbon and oxygen isotopes analyses for the Sinian carbonates in the Helan Mountain, North China

2013 ◽  
Vol 58 (32) ◽  
pp. 3943-3955 ◽  
Author(s):  
Jie Yang ◽  
ZuoXun Zeng ◽  
XiongFei Cai ◽  
ZhiYong Li ◽  
TianBin Li ◽  
...  
Keyword(s):  
Oxygen Isotopes ◽  
North China ◽  
Carbon And Oxygen Isotopes ◽  
Helan Mountain

The chemostratigraphy and environmental significance of the Marlstone and Junction Bed (Beacon Limestone, Toarcian, Lower Jurassic, Dorset, UK)

2021 ◽  
pp. 1-15
Author(s):  
Hugh C. Jenkyns ◽  
Sophie Macfarlane
Keyword(s):  
Carbon Isotope ◽  
Oxygen Isotopes ◽  
Lower Jurassic ◽  
Carbon And Oxygen Isotopes ◽  
Oceanic Anoxic Event ◽  
Nodular Limestone ◽  
Anoxic Event ◽  
Reference Curves ◽  
High Degree ◽  
Organic Rich Sediment

Abstract Two fallen blocks of the Marlstone and stratigraphically overlying Junction Bed sampled on the beach below Doghouse Cliff in Dorset, UK (Wessex Basin) have been examined for carbon and oxygen isotopes of bulk carbonate as well as for strontium, carbon and oxygen isotopes and Mg:Ca ratios in the contained belemnites. The sequence, which contains most of the Toarcian zones and subzones within a metre or less of grey to yellow to pink, red and brown fossil-rich nodular limestone, is extremely condensed and lithologically similar to pelagic red limestones of the Tethyan Jurassic that are locally mineralized with Fe-Mn oxyhydroxides (e.g., Rosso Ammonitico). Strontium-isotope ratios of the contained belemnites are compatible with existing reference curves and both blocks show a rise to more radiogenic values post-dating the Pliensbachian–Toarcian boundary. The high degree of correlation between the relatively negative carbon and oxygen isotopes of the bulk carbonate is compatible with significant diagenetic overprint, and contrasts with higher carbon-isotope values in coeval condensed coccolith-rich limestones elsewhere. Evidence for the characteristic signature of the Toarcian Oceanic Anoxic Event, as represented by organic-rich sediment, is absent, possibly owing to a stratigraphic gap. Both blocks exhibit abrupt carbon-isotope shifts to lower values, one of which could represent the limbs of an incompletely recorded negative excursion associated with the Toarcian Oceanic Anoxic Event. That the Toarcian Oceanic Anoxic Event was also a significant hyperthermal is illustrated in both blocks by a drop in oxygen-isotope values and rise in Mg:Ca ratios of belemnites close to the base of the Junction Bed in the lowest part of the serpentinum zone.

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