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Article
Early Cambrian microfossils from the cherts in carbonates of the Kuruktag area, the Tarim block
The basal Cambrian is characteristic for the appearance of small shelly fossils and acanthomorphic acritarchs with relatively small vesicles. In the Tarim Block (NW China) and South China, this microfossil ass...
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Article
Microfossils from nodular cherts in the Middle Ordovician Yijianfang Formation carbonates (Well YJ1X), Tarim Basin, China
Although the micropaleontology of Ordovician deep-sea cherts is relatively well documented, microfossil assemblages in Ordovician shallow-marine cherts are less well-known. Nodular cherts in the Middle Ordovic...
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Article
The Yudomski event and subsequent decline: new evidence from δ34S data of lower and middle Cambrian evaporites in the Tarim Basin, western China
Marine evaporitic sulfates (gypsum and anhydrite) can record ancient seawater sulfur isotopic data; however, these records are scarce and widely dispersed owing to both restricted environments in which they fo...
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Article
Stromatolites in Middle Ordovician carbonate–evaporite sequences and their carbon and sulfur isotopes stratigraphy, Ordos Basin, northwestern China
At the present day, stromatolites are very rare and limited to high-salinity settings. However, abundant and variable stromatolite fossils occur in thick evaporite sequences, the Middle Ordovician Majiagou For...
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Article
Open AccessPositive carbon isotope excursions: global correlation and genesis in the Middle–Upper Ordovician in the northern Tarim Basin, Northwest China
Stable carbon isotope ratio (δ13Ccarb) analysis has been widely applied to the study of the inter-continental or global marine carbonate correlation. Large-scale Cambrian–Ordovician carbonate platforms were devel...
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Article
Mechanical features of Shanxi Datong earthquake swarm sequence and their numerical simulation by using finite element method
The seismicity characteristics of the earthquake swarm occurred in Datong area in Shanxi Province during 1989–1993 period are studied in detail. The focal mechanisms and rupture processes of the principal eart...
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Article
Interaction among fractures and stress field computation of fracture systems
The interaction problem among fractures under the action of compressional stress is studied in this paper by using the finite element method and boundary element method respectively. The mechanical criteria wh...
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Article
A model of nonuniform fracture system for Langcang-Gengma earthquake sequence and elasto-plastic computation method
Based on the observation data, it is found that the Lancang-Gengma earthquake sequence is resulting from the propagation of a nonuniform fracture system in which the lengths and strikes of fractures are differ...