Depositional history, tectonics, and provenance of the Cambrian-Ordovician boundary interval in the western margin of the North China block

Myrow, Paul M.; Chen, Jitao; Snyder, Zachary; Leslie, Stephen A.; Fike, David A.; Fanning, C. Mark; Yuan, Junhua; Tang, Peng

doi:10.1130/b31228.1

Cited by 59 publications

(52 citation statements)

References 92 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…the North Qinling block (e.g., J. S. Yang et al, 2003;H. F. Zhang, Yu, et al, 2015) and by the Cambrian-Ordovician angular unconformity along northern Australia (Myrow et al, 2015). As mentioned before, (Figure 9b).…”

Section: Palaeozoic Accretionary Orogenesissupporting

confidence: 60%

“…In the context of assembly and break‐up of supercontinent, the Tarim and North China cratons likely collided with the northern Australia margin of East Gondwana at ca. 500 Ma, which is supported by ~0.5 Ga peak of ages of detrital zircon grains from modern sands of Australia (Cawood et al, ; Condie, Belousova, Griffin, & Sircombe, ), by 510–470 Ma (U)HP metamorphic events in the southern Altyn Tagh area (e.g., Zhang, Mattinson, Yu, & Li, ) and the North Qinling block (e.g., J. S. Yang et al, ; H. F. Zhang, Yu, et al, ) and by the Cambrian–Ordovician angular unconformity along northern Australia (Myrow et al, ). As mentioned before, the first‐stage subduction of the SW Palaeo‐Asian Ocean north of the Palaeozoic Tarim likely initiated at ca.…”

Section: Discussionmentioning

confidence: 86%

See 1 more Smart Citation

Crustal evolution in the South Tianshan Terrane: Constraints from detrital zircon geochronology and implications for continental growth in the Central Asian Orogenic Belt

et al. 2018

View full text Add to dashboard Cite

The South Tianshan Terrane (STT) is located in the boundary between the south‐western Central Asian Orogenic Belt (CAOB) and the Tarim Craton and is a key area for understanding the geologic and tectonic history of the craton and the orogenic belt. In this paper, we report detrital zircon ages from the Late Palaeozoic and Mesozoic clastic sedimentary rocks from the southern part of STT. In combination with the U–Pb ages for felsic igneous and meta‐igneous rocks exposed in the STT and adjacent tectonic units, we identify several distinct age populations. Provenance analysis suggests that the detrital zircon grains were predominately derived from the felsic magmatic rocks in the Tarim Craton and South Tianshan Terrane. The pre‐Neoproterozoic age populations may be associated with the early history of the Tarim Craton. Several pulses of Neoproterozoic magmatism are revealed by our dataset, presumably related to the assembly and break‐up of the supercontinent Rodinia. The 995 to 901 Ma detrital zircon grains were likely sourced from magmatic rocks associated with the assembly of Neoproterozoic Tarim to Australia. Among the age population of 886 to 752 Ma, the older group might be related to the subduction‐related magmatism after the assembly of Rodinia, and the younger one records a protracted magmatic event in a continental rift‐related setting associated with the break‐up of Rodinia. Two younger Neoproterozoic age populations (736 to 694 Ma and 665 to 610 Ma), showing narrow spreads with weak peaks, represent the waning stages of igneous activities related to the break‐up of Rodinia. Regarding the Palaeozoic evolution, together with other evidence, our data indicate a two‐stage subduction model for the SW Palaeo‐Asian Ocean. The 490 to 384 Ma age population corroborates the existence of Early Palaeozoic continental arc magmatism at the northern margin of Palaeozoic Tarim generated by the bidirectional subduction of the South Tianshan Ocean. After a ~30 My period of tectonomagmatic quiescence, the second stage is marked by the northward subduction of the South Tianshan Terrane during Late Devonian to Early Carboniferous. The final collision of Tarim and the south‐western CAOB likely occurred during the Late Carboniferous, followed by syn‐ and post‐collisional magmatism, as represented by the 320 to 265 Ma age population. Based on the detrital zircon ages in conjunction with the Hf isotopic features of zircons from Palaeozoic igneous rocks, our study does not support the model of large‐scale Phanerozoic net continental growth in the South Tianshan Terrane.

show abstract

Section: Palaeozoic Accretionary Orogenesissupporting

confidence: 60%

Section: Discussionmentioning

confidence: 86%

Crustal evolution in the South Tianshan Terrane: Constraints from detrital zircon geochronology and implications for continental growth in the Central Asian Orogenic Belt

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Interpretation: Occurrence of the thrombolites within a succession dominated by thin-bedded limestone and shale suggests deposition in a relatively deep environment, possibly near or below storm wave base (Pfeil and Read, 1980;Kwon et al, 2006;Chen et al, 2011;Myrow et al, 2015). This is consistent with lack of wave-or current-induced sedimentary structures within the thin-bedded lime mudstone and shale.…”

Section: Thrombolitementioning

confidence: 83%

“…2). The succession was generally deposited in outer ramp settings, similar to those of the inner detrital belt of Laurentia (Myrow et al, 2015).…”

Section: Geological Setting and Methodsmentioning

confidence: 98%

“…Interpretation: The occurrence of maceriate reefs within thin-bedded limestone and shale/marlstone suggests deposition in a relatively deep environment (Pfeil and Read, 1980;Kwon et al, 2006;Lee et al, 2010;Chen et al, 2011;Myrow et al, 2015). In contrast, grainstones within and between the mounds suggest that high-energy processes (e.g., storms) occasionally affected growth of these maceriate reefs and in some cases might have buried mounds.…”

Section: Maze-like Maceriate Reefmentioning

confidence: 99%

See 1 more Smart Citation

Cambrian Reefs in the Western North China Platform, Wuhai, Inner Mongolia

Lee

Kim

Liang

et al. 2016

Acta Geologica Sinica (Eng)

View full text Add to dashboard Cite

Mid to late Cambrian thrombolites and maze‐like maceriate reefs from the western North China Platform, Wuhai, Inner Mongolia, northwestern China, occur in the middle of a succession dominated by thin‐bedded lime mudstone‐shale/marlstone alternations, and are laterally surrounded by limestone conglomerate and/or grainstone. Thrombolite, characterized by meter‐scale lenticular mounds composed of millimeter‐ to centimeter‐scale mesoclots and wackestone matrix, occurs in the lower middle part of the sequence. Thrombolite mesoclots are composed of microstromatolites with alternating dark gray and light gray micritic laminae. The maze‐like maceriate reefs occur in the middle to the upper part of the sequence, commonly forming lenticular mounds up to 1 m thick. They are characterized by centimeter‐ to decimeter‐scale branched maze‐like structures, whose biogenic portions (maceria) are selectively dolomitized. The maceriae are composed of poorly preserved microstromatolites and siliceous sponges. Inter‐macerial sediments consist of lime mud and scattered bioclasts. These Wuhai reefs are generally similar to but older than various other Cambrian reefs previously reported from the Shandong region, northeastern China.

show abstract

Cambrian marine radial cerebroid ooids: Participatory products of microbial processes

et al. 2021

View full text Add to dashboard Cite

The Cambrian Miaolingian Series strata at the Kouquan section, North China, are primarily divided into the Xuzhuang, Zhangxia, and Gushan formations. This particular series comprises oolitic limestone in the middle to upper intervals. Thin section observations of carbonate rock samples from the Zhangxia Formation show that the well‐preserved and most remarkable grains among them are cerebroid ooids. Although these ooids have characteristic serrated margins, they are distinct from ooids reported in previous publications due to inconspicuous concentric laminae and radial structures composed of micrite and microspar. To understand the origin of these ooids, we employed petrographic examination, X‐ray diffraction (XRD), scanning electron microscopy (SEM), electron probe microanalysis (EPMA), and isotope analyses to explore their compositions and conditions of development. In addition, the occurrence of these cerebroid ooids is closely related to that of dark‐coloured micrite: most cerebroid ooids and quasi‐cerebroid ooids float inside dark micrite; dark micrite appears in the interior of cerebroid ooids as a radial micrite structure. EPMA and energy‐dispersive X‐ray (EDX) spectroscopy analyses of micrite reveal that the dark micrite consists of lithomicrobial mats. Fine‐scale characterization of the dark micrite inside these cerebroid ooids shows the presence of filamentous and bowl‐shaped calcified microbial fossils and extracellular polymeric substance (EPS) calcified remnants. Isotopic data indicate a variation of δ13C isotopic values between −4.92‰ and −0.11‰ (VPDB) and −9.89‰ and −4.93‰ for δ18O values (VPDB). The negative values of δ13C in the studied ooid suggest the genesis of carbon from the high organic‐rich zone such as the microbial zone. Also, the 13C‐depleted carbon values in the ooids advocate that the carbon is mainly derived from organic sources associated with the sulphate reduction bacterial activity. Thus, isotopic data of this study also provide consistent clues in favour of microbial participation during the genesis of cerebroid ooids. In conclusion, our new findings strongly confirm that the cerebroid ooids of the North China Platform are genetically related to microbial processes.

show abstract

Depositional history, tectonics, and provenance of the Cambrian-Ordovician boundary interval in the western margin of the North China block

Cited by 59 publications

References 92 publications

Crustal evolution in the South Tianshan Terrane: Constraints from detrital zircon geochronology and implications for continental growth in the Central Asian Orogenic Belt

Crustal evolution in the South Tianshan Terrane: Constraints from detrital zircon geochronology and implications for continental growth in the Central Asian Orogenic Belt

Cambrian Reefs in the Western North China Platform, Wuhai, Inner Mongolia

Cambrian marine radial cerebroid ooids: Participatory products of microbial processes

Contact Info

Product

Resources

About