Tectono-stratigraphy of Lower Cretaceous Tanan sub-basin, Tamtsag Basin, Mongolia: Sequence architecture, depositional systems and controls on sediment infill

A short-lived but significant Mongol–Okhotsk collisional orogeny in latest Jurassic–earliest Cretaceous

“…The Upper Paleozoic Budate Group, composed of sandstone, conglomerate, and volcanic rocks, is the basement of the basin (Meng et al, 2013) (Fig. 5), which has a high-angle unconformable contact with the overlying Lower Cretaceous strata in most parts of the basin (Zhou et al, 2014). The Upper Jurassic Tamulangou Formation (also called Xing'anling Group) is discontinuously distributed in the basin and so is absent in most wells that have encountered the basement of the basin (Meng et al, 2013;Zhou et al, 2014).…”

“…5), which has a high-angle unconformable contact with the overlying Lower Cretaceous strata in most parts of the basin (Zhou et al, 2014). The Upper Jurassic Tamulangou Formation (also called Xing'anling Group) is discontinuously distributed in the basin and so is absent in most wells that have encountered the basement of the basin (Meng et al, 2013;Zhou et al, 2014). The formation is composed of volcanic rocks interbedded with volcaniclastic rocks and coal beds with a thickness of 100-800 m (J.…”

“…Z. Liu et al, 2007;Zhou et al, 2014) Table 1). Note that some volcanic rocks of the so-called Upper Jurassic Xing'anling Group drilled in the basin yielded zircon U-Pb ages of 126-120 Ma (Table 1), supporting the suggestion that some traditionally-defined Upper Jurassic units in the Great Xing'an ranges, such as the Xing'anling Group, Tamulangou Formation, and Manketouebo Formation, are not strictly single stratigraphic units J.H.…”

The sequence stratigraphy and depositional characteristics of fan‐delta complexes in the Upper Bayingebi Member (Lower Cretaceous) in Chagan Sag, Inner Mongolia, China

“…Previous studies have focused mainly on the depositional process (e.g., debris fall, debris flow, turbidity current, and slope instability) and facies distribution of fan deltas developed in marine settings (Dabrio, ; Nemec, ; Prior & Bornhold, ; Scholz & Rosendahl, ). However, an increasing number of studies have also revealed that such deltaic systems are quite common in lacustrine basins, particularly in intracontinental rift basins (Cope et al, ; Feng, Li, & Lu, ; Liu et al, ; Zhou, Ji, Pigott, Meng, & Wan, ). Decades of work have shown that these coarse‐grained delta systems can be prospective reservoirs particularly in lacustrine rift basins (Liu, Jiang, Zhang, Zhou, & Lu, ; Scholz, ).…”

Relative role of accommodation zones in controlling stratal architectural variability and facies distribution: Insights from the Fushan Depression, South China Sea

“…Tectono-stratigraphic approach has been widely used as a powerful tool for showing sequence architecture and depositional filling characteristics in relation to different tectonic backgrounds (Gawthorpe and Leeder, 2000;Pascucci et al, 2006;Grimm et al, 2013;Jiang et al, 2013;Zhou et al, 2014). In rifted lacustrine basins, the spatial distribution of slope geometries controls the basin accommodation and sediment supply systems, resulting in the variability in stratal architecture (Fig.1).…”