Findings on Sedimentary Geology Detailed by J.W. Zhang and Co-Authors (The provenance and tectonic setting of the Lower Devonian sandstone of the Danlin Formation in southeast Yangtze Plate, with implications for the Wuyi-Yunkai orogeny in ...)
By a News Reporter-Staff News Editor at China Weekly News -- New research on Geology - Sedimentary Geology is the subject of a report. According to news reporting originating from Guiyang, People's Republic of China, by VerticalNews correspondents, research stated, "The South China Block was subject to widespread tectonic and magmatic events during the middle Ordovician to earliest Devonian which are collectively called the Wuyi-Yunkai orogeny. Two different hypotheses were formulated about the origin of the orogeny: collisional orogenesis and intracontinental orogenesis."
Financial supporters for this research include Guizhou Scientific and Technology Fund, China Geological Survey.
Our news editors obtained a quote from the research, "Ages of 215 detrital zircons were obtained from quartz sandstones in the Lower Devonian Danlin Formation exposed in Dushan County, south Guizhou Province. The results show that the detrital zircons came from multiple source areas but with little indication of the Wuyi-Yunkai orogeny. The detrital zircons of early Paleozoic age account only for 1.9% of all samples. These zircons range from 476 to 402 Ma and originated from the early Paleozoic granites situated east of Dushan County. The mean Pb-206/U-238 age of the two youngest detrital zircons was 404 Ma, which constrains the maximum depositional age of the Danlin Formation. The detrital zircons are mostly within Neoproterozoic age (59.5%) and in the range 997 to 557 Ma. The zircon age pattern, morphology, and trace element characteristics combined with paleogeographic reconstruction interpret that these detrital zircons were supplied from igneous rocks in the Neoproterozoic Sibao and Danzhou Groups within the west Jiangnan orogen to the east of the study area. Mesoproterozoic zircons made up 20.9% of the grains and range from 1569 to 1055 Ma; the ages of most of these zircons coincide with those of zircons indicating the Grenvillian orogeny (1300-1000 Ma) in the Cathaysia Plate. The detrital zircon age data reveal that the study area was located in an intracontinental tectonic setting, both before and after the Wuyi-Yunkai orogeny. Therefore, the Cathaysia Plate was not separated from the Yangtze Plate by an ocean and the study area received sediments primarily from the Cathaysia Plate located to the southeast since the middle Ordovician. By the early Devonian, the sediments were supplied by the west Jiangnan orogen."
According to the news editors, the research concluded: "Although a source change was caused by WuyiYunkai orogeny, our data imply that this orogeny represented an intracontinental event rather than an orogenesis involving subduction-collision and joining of the Yangtze and Cathaysia Plates during the early Paleozoic."
For more information on this research see: The provenance and tectonic setting of the Lower Devonian sandstone of the Danlin Formation in southeast Yangtze Plate, with implications for the Wuyi-Yunkai orogeny in South China Block. Sedimentary Geology, 2016;346():25-34. Sedimentary Geology can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier - www.elsevier.com; Sedimentary Geology - www.journals.elsevier.com/sedimentary-geology/)
The news editors report that additional information may be obtained by contacting T.P. Ye, Bur Geol & Mineral Explorat & Dev Guizhou Prov, Guizhou Cent Lab Geol & Mineral Resources, Guiyang 550005, People's Republic of China. Additional authors for this research include T.P. Ye, S.C. Li, G.H. Yuan, C.G. Dai, H. Zhang and Y.B. Ma.
The direct object identifier (DOI) for that additional information is: http://dx.doi.org/10.1016/j.sedgeo.2016.10.004. This DOI is a link to an online electronic document that is either free or for purchase.
Keywords for this news article include: Guiyang, People's Republic of China, Asia, Sedimentary Geology, Geology, China, Asia.
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